mirror of
https://github.com/psycopg/psycopg2.git
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Dropped examples dir (and some leftover reference to the sandbox dir)
Close #645.
This commit is contained in:
Daniele Varrazzo
parent
f9d6430ae4
commit
654be4784c
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@ -1,7 +1,6 @@
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recursive-include psycopg *.c *.h *.manifest
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recursive-include psycopg *.c *.h *.manifest
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recursive-include lib *.py
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recursive-include lib *.py
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recursive-include tests *.py
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recursive-include tests *.py
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recursive-include examples *.py somehackers.jpg whereareyou.jpg
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include doc/README.rst doc/SUCCESS doc/COPYING.LESSER doc/pep-0249.txt
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include doc/README.rst doc/SUCCESS doc/COPYING.LESSER doc/pep-0249.txt
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include doc/Makefile doc/requirements.txt
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include doc/Makefile doc/requirements.txt
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recursive-include doc/src *.rst *.py *.css Makefile
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recursive-include doc/src *.rst *.py *.css Makefile
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7
NEWS
7
NEWS
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@ -1012,7 +1012,7 @@ What's new in psycopg 2.0 beta 7
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What's new in psycopg 2.0 beta 6
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What's new in psycopg 2.0 beta 6
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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* Support for named cursors (see examples/fetch.py).
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* Support for named cursors.
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* Safer parsing of time intervals.
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* Safer parsing of time intervals.
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@ -1042,7 +1042,7 @@ What's new in psycopg 2.0 beta 5
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* All classes have been renamed to exist in the psycopg2._psycopg module,
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* All classes have been renamed to exist in the psycopg2._psycopg module,
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to fix problems with automatic documentation generators like epydoc.
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to fix problems with automatic documentation generators like epydoc.
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* NOTIFY is correctly trapped (see examples/notify.py for example code.)
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* NOTIFY is correctly trapped.
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What's new in psycopg 2.0 beta 4
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What's new in psycopg 2.0 beta 4
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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@ -1159,8 +1159,7 @@ What's new in psycopg 1.99.10
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What's new in psycopg 1.99.9
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What's new in psycopg 1.99.9
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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* Added simple pooling code (psycopg.pool module); see the reworked
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* Added simple pooling code (psycopg.pool module).
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examples/threads.py for example code.
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* Added DECIMAL typecaster to convert postgresql DECIMAL and NUMERIC
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* Added DECIMAL typecaster to convert postgresql DECIMAL and NUMERIC
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types (i.e, all types with an OID of NUMERICOID.) Note that the
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types (i.e, all types with an OID of NUMERICOID.) Note that the
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@ -1,90 +0,0 @@
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# binary.py - working with binary data
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#
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# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
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#
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# psycopg2 is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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# License for more details.
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## put in DSN your DSN string
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DSN = 'dbname=test'
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## don't modify anything below this line (except for experimenting)
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from __future__ import print_function
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import sys
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import psycopg2
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if len(sys.argv) > 1:
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DSN = sys.argv[1]
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print("Opening connection using dsn:", DSN)
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conn = psycopg2.connect(DSN)
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print("Encoding for this connection is", conn.encoding)
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curs = conn.cursor()
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try:
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curs.execute("CREATE TABLE test_binary (id int4, name text, img bytea)")
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except:
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conn.rollback()
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curs.execute("DROP TABLE test_binary")
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curs.execute("CREATE TABLE test_binary (id int4, name text, img bytea)")
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conn.commit()
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# first we try two inserts, one with an explicit Binary call and the other
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# using a buffer on a file object.
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data1 = {'id':1, 'name':'somehackers.jpg',
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'img':psycopg2.Binary(open('somehackers.jpg').read())}
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data2 = {'id':2, 'name':'whereareyou.jpg',
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'img':buffer(open('whereareyou.jpg').read())}
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curs.execute("""INSERT INTO test_binary
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VALUES (%(id)s, %(name)s, %(img)s)""", data1)
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curs.execute("""INSERT INTO test_binary
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VALUES (%(id)s, %(name)s, %(img)s)""", data2)
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# now we try to extract the images as simple text strings
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print("Extracting the images as strings...")
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curs.execute("SELECT * FROM test_binary")
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for row in curs.fetchall():
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name, ext = row[1].split('.')
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new_name = name + '_S.' + ext
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print(" writing %s to %s ..." % (name+'.'+ext, new_name), end=' ')
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open(new_name, 'wb').write(row[2])
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print("done")
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print(" python type of image data is", type(row[2]))
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# extract exactly the same data but using a binary cursor
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print("Extracting the images using a binary cursor:")
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curs.execute("""DECLARE zot CURSOR FOR
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SELECT img, name FROM test_binary FOR READ ONLY""")
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curs.execute("""FETCH ALL FROM zot""")
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for row in curs.fetchall():
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name, ext = row[1].split('.')
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new_name = name + '_B.' + ext
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print(" writing %s to %s ..." % (name+'.'+ext, new_name), end=' ')
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open(new_name, 'wb').write(row[0])
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print("done")
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print(" python type of image data is", type(row[0]))
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# this rollback is required because we can't drop a table with a binary cursor
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# declared and still open
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conn.rollback()
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curs.execute("DROP TABLE test_binary")
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conn.commit()
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print("\nNow try to load the new images, to check it worked!")
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@ -1,174 +0,0 @@
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# copy_from.py -- example about copy_from
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#
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# Copyright (C) 2002 Tom Jenkins <tjenkins@devis.com>
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# Copyright (C) 2005 Federico Di Gregorio <fog@initd.org>
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#
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# psycopg2 is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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# License for more details.
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## put in DSN your DSN string
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DSN = 'dbname=test'
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## don't modify anything below this line (except for experimenting)
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import sys
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import os
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import StringIO
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import psycopg2
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if len(sys.argv) > 1:
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DSN = sys.argv[1]
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print("Opening connection using dsn:", DSN)
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conn = psycopg2.connect(DSN)
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print("Encoding for this connection is", conn.encoding)
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curs = conn.cursor()
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try:
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curs.execute("CREATE TABLE test_copy (fld1 text, fld2 text, fld3 int4)")
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except:
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conn.rollback()
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curs.execute("DROP TABLE test_copy")
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curs.execute("CREATE TABLE test_copy (fld1 text, fld2 text, fld3 int4)")
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conn.commit()
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# copy_from with default arguments, from open file
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io = open('copy_from.txt', 'wr')
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data = ['Tom\tJenkins\t37\n',
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'Madonna\t\\N\t45\n',
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'Federico\tDi Gregorio\t\\N\n']
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io.writelines(data)
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io.close()
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io = open('copy_from.txt', 'r')
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curs.copy_from(io, 'test_copy')
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print("1) Copy %d records from file object " % len(data) +
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"using defaults (sep: \\t and null = \\N)")
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io.close()
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curs.execute("SELECT * FROM test_copy")
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rows = curs.fetchall()
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print(" Select returned %d rows" % len(rows))
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for r in rows:
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print(" %s %s\t%s" % (r[0], r[1], r[2]))
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curs.execute("delete from test_copy")
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conn.commit()
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# copy_from using custom separator, from open file
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io = open('copy_from.txt', 'wr')
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data = ['Tom:Jenkins:37\n',
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'Madonna:\N:45\n',
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'Federico:Di Gregorio:\N\n']
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io.writelines(data)
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io.close()
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io = open('copy_from.txt', 'r')
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curs.copy_from(io, 'test_copy', ':')
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print("2) Copy %d records from file object using sep = :" % len(data))
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io.close()
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curs.execute("SELECT * FROM test_copy")
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rows = curs.fetchall()
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print(" Select returned %d rows" % len(rows))
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for r in rows:
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print(" %s %s\t%s" % (r[0], r[1], r[2]))
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curs.execute("delete from test_copy")
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conn.commit()
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# copy_from using custom null identifier, from open file
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io = open('copy_from.txt', 'wr')
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data = ['Tom\tJenkins\t37\n',
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'Madonna\tNULL\t45\n',
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'Federico\tDi Gregorio\tNULL\n']
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io.writelines(data)
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io.close()
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io = open('copy_from.txt', 'r')
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curs.copy_from(io, 'test_copy', null='NULL')
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print("3) Copy %d records from file object using null = NULL" % len(data))
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io.close()
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curs.execute("SELECT * FROM test_copy")
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rows = curs.fetchall()
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print(" Select using cursor returned %d rows" % len(rows))
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for r in rows:
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print(" %s %s\t%s" % (r[0], r[1], r[2]))
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curs.execute("delete from test_copy")
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conn.commit()
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# copy_from using custom separator and null identifier
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io = open('copy_from.txt', 'wr')
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data = ['Tom:Jenkins:37\n', 'Madonna:NULL:45\n', 'Federico:Di Gregorio:NULL\n']
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io.writelines(data)
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io.close()
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io = open('copy_from.txt', 'r')
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curs.copy_from(io, 'test_copy', ':', 'NULL')
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print("4) Copy %d records from file object " % len(data) +
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"using sep = : and null = NULL")
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io.close()
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curs.execute("SELECT * FROM test_copy")
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rows = curs.fetchall()
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print(" Select using cursor returned %d rows" % len(rows))
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for r in rows:
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print(" %s %s\t%s" % (r[0], r[1], r[2]))
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curs.execute("delete from test_copy")
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conn.commit()
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# anything can be used as a file if it has .read() and .readline() methods
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data = StringIO.StringIO()
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data.write('\n'.join(['Tom\tJenkins\t37',
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'Madonna\t\N\t45',
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'Federico\tDi Gregorio\t\N']))
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data.seek(0)
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curs.copy_from(data, 'test_copy')
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print("5) Copy 3 records from StringIO object using defaults")
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curs.execute("SELECT * FROM test_copy")
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rows = curs.fetchall()
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print(" Select using cursor returned %d rows" % len(rows))
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for r in rows:
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print(" %s %s\t%s" % (r[0], r[1], r[2]))
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curs.execute("delete from test_copy")
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conn.commit()
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# simple error test
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print("6) About to raise an error")
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data = StringIO.StringIO()
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data.write('\n'.join(['Tom\tJenkins\t37',
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'Madonna\t\N\t45',
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'Federico\tDi Gregorio\taaa']))
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data.seek(0)
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try:
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curs.copy_from(data, 'test_copy')
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|
||||||
except StandardError as err:
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|
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conn.rollback()
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print(" Caught error (as expected):\n", err)
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|
|
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conn.rollback()
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|
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|
|
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curs.execute("DROP TABLE test_copy")
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os.unlink('copy_from.txt')
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conn.commit()
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@ -1,104 +0,0 @@
|
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# copy_to.py -- example about copy_to
|
|
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#
|
|
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# Copyright (C) 2002 Tom Jenkins <tjenkins@devis.com>
|
|
||||||
# Copyright (C) 2005 Federico Di Gregorio <fog@initd.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
from __future__ import print_function
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import os
|
|
||||||
import StringIO
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|
||||||
import psycopg2
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
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|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
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|
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conn = psycopg2.connect(DSN)
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|
||||||
print("Encoding for this connection is", conn.encoding)
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|
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|
|
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curs = conn.cursor()
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|
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try:
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|
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curs.execute("CREATE TABLE test_copy (fld1 text, fld2 text, fld3 int4)")
|
|
||||||
except:
|
|
||||||
conn.rollback()
|
|
||||||
curs.execute("DROP TABLE test_copy")
|
|
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curs.execute("CREATE TABLE test_copy (fld1 text, fld2 text, fld3 int4)")
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|
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conn.commit()
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|
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|
|
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# demostrate copy_to functionality
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|
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data = [('Tom', 'Jenkins', '37'),
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|
||||||
('Madonna', None, '45'),
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|
||||||
('Federico', 'Di Gregorio', None)]
|
|
||||||
query = "INSERT INTO test_copy VALUES (%s, %s, %s)"
|
|
||||||
curs.executemany(query, data)
|
|
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conn.commit()
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|
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|
|
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# copy_to using defaults
|
|
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io = open('copy_to.txt', 'w')
|
|
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curs.copy_to(io, 'test_copy')
|
|
||||||
print("1) Copy %d records into file object using defaults: " % len (data) + \
|
|
||||||
"sep = \\t and null = \\N")
|
|
||||||
io.close()
|
|
||||||
|
|
||||||
rows = open('copy_to.txt', 'r').readlines()
|
|
||||||
print(" File has %d rows:" % len(rows))
|
|
||||||
|
|
||||||
for r in rows:
|
|
||||||
print(" ", r, end=' ')
|
|
||||||
|
|
||||||
# copy_to using custom separator
|
|
||||||
io = open('copy_to.txt', 'w')
|
|
||||||
curs.copy_to(io, 'test_copy', ':')
|
|
||||||
print("2) Copy %d records into file object using sep = :" % len(data))
|
|
||||||
io.close()
|
|
||||||
|
|
||||||
rows = open('copy_to.txt', 'r').readlines()
|
|
||||||
print(" File has %d rows:" % len(rows))
|
|
||||||
|
|
||||||
for r in rows:
|
|
||||||
print(" ", r, end=' ')
|
|
||||||
|
|
||||||
# copy_to using custom null identifier
|
|
||||||
io = open('copy_to.txt', 'w')
|
|
||||||
curs.copy_to(io, 'test_copy', null='NULL')
|
|
||||||
print("3) Copy %d records into file object using null = NULL" % len(data))
|
|
||||||
io.close()
|
|
||||||
|
|
||||||
rows = open('copy_to.txt', 'r').readlines()
|
|
||||||
print(" File has %d rows:" % len(rows))
|
|
||||||
|
|
||||||
for r in rows:
|
|
||||||
print(" ", r, end=' ')
|
|
||||||
|
|
||||||
# copy_to using custom separator and null identifier
|
|
||||||
io = open('copy_to.txt', 'w')
|
|
||||||
curs.copy_to(io, 'test_copy', ':', 'NULL')
|
|
||||||
print("4) Copy %d records into file object using sep = : and null ) NULL" % \
|
|
||||||
len(data))
|
|
||||||
io.close()
|
|
||||||
|
|
||||||
rows = open('copy_to.txt', 'r').readlines()
|
|
||||||
print(" File has %d rows:" % len(rows))
|
|
||||||
|
|
||||||
for r in rows:
|
|
||||||
print(" ", r, end=' ')
|
|
||||||
|
|
||||||
curs.execute("DROP TABLE test_copy")
|
|
||||||
os.unlink('copy_to.txt')
|
|
||||||
conn.commit()
|
|
||||||
|
|
@ -1,63 +0,0 @@
|
||||||
# cursor.py - how to subclass the cursor type
|
|
||||||
#
|
|
||||||
# Copyright (C) 2004-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
import psycopg2.extensions
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
|
|
||||||
class NoDataError(psycopg2.ProgrammingError):
|
|
||||||
"""Exception that will be raised by our cursor."""
|
|
||||||
pass
|
|
||||||
|
|
||||||
class Cursor(psycopg2.extensions.cursor):
|
|
||||||
"""A custom cursor."""
|
|
||||||
|
|
||||||
def fetchone(self):
|
|
||||||
"""Like fetchone but raise an exception if no data is available.
|
|
||||||
|
|
||||||
Note that to have .fetchmany() and .fetchall() to raise the same
|
|
||||||
exception we'll have to override them too; even if internally psycopg
|
|
||||||
uses the same function to fetch rows, the code path from Python is
|
|
||||||
different.
|
|
||||||
"""
|
|
||||||
d = psycopg2.extensions.cursor.fetchone(self)
|
|
||||||
if d is None:
|
|
||||||
raise NoDataError("no more data")
|
|
||||||
return d
|
|
||||||
|
|
||||||
curs = conn.cursor(cursor_factory=Cursor)
|
|
||||||
curs.execute("SELECT 1 AS foo")
|
|
||||||
print("Result of fetchone():", curs.fetchone())
|
|
||||||
|
|
||||||
# now let's raise the exception
|
|
||||||
try:
|
|
||||||
curs.fetchone()
|
|
||||||
except NoDataError as err:
|
|
||||||
print("Exception caught:", err)
|
|
||||||
|
|
||||||
conn.rollback()
|
|
||||||
|
|
@ -1,137 +0,0 @@
|
||||||
"""
|
|
||||||
This example/recipe has been contributed by Valentino Volonghi (dialtone)
|
|
||||||
|
|
||||||
Mapping arbitrary objects to a PostgreSQL database with psycopg2
|
|
||||||
|
|
||||||
- Problem
|
|
||||||
|
|
||||||
You need to store arbitrary objects in a PostgreSQL database without being
|
|
||||||
intrusive for your classes (don't want inheritance from an 'Item' or
|
|
||||||
'Persistent' object).
|
|
||||||
|
|
||||||
- Solution
|
|
||||||
"""
|
|
||||||
|
|
||||||
from datetime import datetime
|
|
||||||
|
|
||||||
import psycopg2
|
|
||||||
from psycopg2.extensions import adapt, register_adapter
|
|
||||||
|
|
||||||
# Here is the adapter for every object that we may ever need to
|
|
||||||
# insert in the database. It receives the original object and does
|
|
||||||
# its job on that instance
|
|
||||||
|
|
||||||
class ObjectMapper(object):
|
|
||||||
def __init__(self, orig, curs=None):
|
|
||||||
self.orig = orig
|
|
||||||
self.tmp = {}
|
|
||||||
self.items, self.fields = self._gatherState()
|
|
||||||
|
|
||||||
def _gatherState(self):
|
|
||||||
adaptee_name = self.orig.__class__.__name__
|
|
||||||
fields = sorted([(field, getattr(self.orig, field))
|
|
||||||
for field in persistent_fields[adaptee_name]])
|
|
||||||
items = []
|
|
||||||
for item, value in fields:
|
|
||||||
items.append(item)
|
|
||||||
return items, fields
|
|
||||||
|
|
||||||
def getTableName(self):
|
|
||||||
return self.orig.__class__.__name__
|
|
||||||
|
|
||||||
def getMappedValues(self):
|
|
||||||
tmp = []
|
|
||||||
for i in self.items:
|
|
||||||
tmp.append("%%(%s)s"%i)
|
|
||||||
return ", ".join(tmp)
|
|
||||||
|
|
||||||
def getValuesDict(self):
|
|
||||||
return dict(self.fields)
|
|
||||||
|
|
||||||
def getFields(self):
|
|
||||||
return self.items
|
|
||||||
|
|
||||||
def generateInsert(self):
|
|
||||||
qry = "INSERT INTO"
|
|
||||||
qry += " " + self.getTableName() + " ("
|
|
||||||
qry += ", ".join(self.getFields()) + ") VALUES ("
|
|
||||||
qry += self.getMappedValues() + ")"
|
|
||||||
return qry, self.getValuesDict()
|
|
||||||
|
|
||||||
# Here are the objects
|
|
||||||
class Album(object):
|
|
||||||
id = 0
|
|
||||||
def __init__(self):
|
|
||||||
self.creation_time = datetime.now()
|
|
||||||
self.album_id = self.id
|
|
||||||
Album.id = Album.id + 1
|
|
||||||
self.binary_data = buffer('12312312312121')
|
|
||||||
|
|
||||||
class Order(object):
|
|
||||||
id = 0
|
|
||||||
def __init__(self):
|
|
||||||
self.items = ['rice','chocolate']
|
|
||||||
self.price = 34
|
|
||||||
self.order_id = self.id
|
|
||||||
Order.id = Order.id + 1
|
|
||||||
|
|
||||||
register_adapter(Album, ObjectMapper)
|
|
||||||
register_adapter(Order, ObjectMapper)
|
|
||||||
|
|
||||||
# Describe what is needed to save on each object
|
|
||||||
# This is actually just configuration, you can use xml with a parser if you
|
|
||||||
# like to have plenty of wasted CPU cycles ;P.
|
|
||||||
|
|
||||||
persistent_fields = {'Album': ['album_id', 'creation_time', 'binary_data'],
|
|
||||||
'Order': ['order_id', 'items', 'price']
|
|
||||||
}
|
|
||||||
|
|
||||||
print(adapt(Album()).generateInsert())
|
|
||||||
print(adapt(Album()).generateInsert())
|
|
||||||
print(adapt(Album()).generateInsert())
|
|
||||||
print(adapt(Order()).generateInsert())
|
|
||||||
print(adapt(Order()).generateInsert())
|
|
||||||
print(adapt(Order()).generateInsert())
|
|
||||||
|
|
||||||
"""
|
|
||||||
- Discussion
|
|
||||||
|
|
||||||
Psycopg 2 has a great new feature: adaptation. The big thing about
|
|
||||||
adaptation is that it enables the programmer to glue most of the
|
|
||||||
code out there without many difficulties.
|
|
||||||
|
|
||||||
This recipe tries to focus attention on a way to generate SQL queries to
|
|
||||||
insert completely new objects inside a database. As you can see objects do
|
|
||||||
not know anything about the code that is handling them. We specify all the
|
|
||||||
fields that we need for each object through the persistent_fields dict.
|
|
||||||
|
|
||||||
The most important lines of this recipe are:
|
|
||||||
register_adapter(Album, ObjectMapper)
|
|
||||||
register_adapter(Order, ObjectMapper)
|
|
||||||
|
|
||||||
In these lines we notify the system that when we call adapt with an Album instance
|
|
||||||
as an argument we want it to istantiate ObjectMapper passing the Album instance
|
|
||||||
as argument (self.orig in the ObjectMapper class).
|
|
||||||
|
|
||||||
The output is something like this (for each call to generateInsert):
|
|
||||||
|
|
||||||
('INSERT INTO Album (album_id, binary_data, creation_time) VALUES
|
|
||||||
(%(album_id)s, %(binary_data)s, %(creation_time)s)',
|
|
||||||
|
|
||||||
{'binary_data': <read-only buffer for 0x402de070, ...>,
|
|
||||||
'creation_time': datetime.datetime(2004, 9, 10, 20, 48, 29, 633728),
|
|
||||||
'album_id': 1}
|
|
||||||
)
|
|
||||||
|
|
||||||
This is a tuple of {SQL_QUERY, FILLING_DICT}, and all the quoting/converting
|
|
||||||
stuff (from python's datetime to postgres s and from python's buffer to
|
|
||||||
postgres' blob) is handled with the same adaptation process hunder the hood
|
|
||||||
by psycopg2.
|
|
||||||
|
|
||||||
At last, just notice that ObjectMapper is working for both Album and Order
|
|
||||||
instances without any glitches at all, and both classes could have easily been
|
|
||||||
coming from closed source libraries or C coded ones (which are not easily
|
|
||||||
modified), whereas a common pattern in todays ORMs or OODBs is to provide
|
|
||||||
a basic 'Persistent' object that already knows how to store itself in the
|
|
||||||
database.
|
|
||||||
"""
|
|
||||||
|
|
@ -1,65 +0,0 @@
|
||||||
# dict.py - using DictCUrsor/DictRow
|
|
||||||
#
|
|
||||||
# Copyright (C) 2005-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
import psycopg2.extras
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
|
|
||||||
curs = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
|
|
||||||
curs.execute("SELECT 1 AS foo, 'cip' AS bar, date(now()) as zot")
|
|
||||||
print("Cursor's row factory is", curs.row_factory)
|
|
||||||
|
|
||||||
data = curs.fetchone()
|
|
||||||
print("The type of the data row is", type(data))
|
|
||||||
print("Some data accessed both as tuple and dict:")
|
|
||||||
print(" ", data['foo'], data['bar'], data['zot'])
|
|
||||||
print(" ", data[0], data[1], data[2])
|
|
||||||
|
|
||||||
# execute another query and demostrate we can still access the row
|
|
||||||
curs.execute("SELECT 2 AS foo")
|
|
||||||
print("The type of the data row is", type(data))
|
|
||||||
print("Some more data accessed both as tuple and dict:")
|
|
||||||
print(" ", data['foo'], data['bar'], data['zot'])
|
|
||||||
print(" ", data[0], data[1], data[2])
|
|
||||||
|
|
||||||
curs = conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
|
|
||||||
curs.execute("SELECT 1 AS foo, 'cip' AS bar, date(now()) as zot")
|
|
||||||
print("Cursor's row factory is", curs.row_factory)
|
|
||||||
|
|
||||||
data = curs.fetchone()
|
|
||||||
print("The type of the data row is", type(data))
|
|
||||||
print("Some data accessed both as tuple and dict:")
|
|
||||||
print(" ", data['foo'], data['bar'], data['zot'])
|
|
||||||
print(" ", "No access using indices: this is a specialized cursor.")
|
|
||||||
|
|
||||||
# execute another query and demostrate we can still access the row
|
|
||||||
curs.execute("SELECT 2 AS foo")
|
|
||||||
print("The type of the data row is", type(data))
|
|
||||||
print("Some more data accessed both as tuple and dict:")
|
|
||||||
print(" ", data['foo'], data['bar'], data['zot'])
|
|
||||||
print(" ", "No access using indices: this is a specialized cursor.")
|
|
||||||
|
|
@ -1,99 +0,0 @@
|
||||||
# datetime.py - example of using date and time types
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
import mx.DateTime
|
|
||||||
import datetime
|
|
||||||
|
|
||||||
from psycopg2.extensions import adapt
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
curs = conn.cursor()
|
|
||||||
|
|
||||||
try:
|
|
||||||
curs.execute("""CREATE TABLE test_dt (
|
|
||||||
k int4, d date, t time, dt timestamp, z interval)""")
|
|
||||||
except:
|
|
||||||
conn.rollback()
|
|
||||||
curs.execute("DROP TABLE test_dt")
|
|
||||||
curs.execute("""CREATE TABLE test_dt (
|
|
||||||
k int4, d date, t time, dt timestamp, z interval)""")
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
# build and insert some data using mx.DateTime
|
|
||||||
mx1 = (
|
|
||||||
1,
|
|
||||||
mx.DateTime.Date(2004, 10, 19),
|
|
||||||
mx.DateTime.Time(0, 11, 17.015),
|
|
||||||
mx.DateTime.Timestamp(2004, 10, 19, 0, 11, 17.5),
|
|
||||||
mx.DateTime.DateTimeDelta(13, 15, 17, 59.9))
|
|
||||||
|
|
||||||
from psycopg2.extensions import adapt
|
|
||||||
import psycopg2.extras
|
|
||||||
print(adapt(mx1))
|
|
||||||
|
|
||||||
print("Inserting mx.DateTime values...")
|
|
||||||
curs.execute("INSERT INTO test_dt VALUES (%s, %s, %s, %s, %s)", mx1)
|
|
||||||
|
|
||||||
# build and insert some values using the datetime adapters
|
|
||||||
dt1 = (
|
|
||||||
2,
|
|
||||||
datetime.date(2004, 10, 19),
|
|
||||||
datetime.time(0, 11, 17, 15000),
|
|
||||||
datetime.datetime(2004, 10, 19, 0, 11, 17, 500000),
|
|
||||||
datetime.timedelta(13, 15*3600+17*60+59, 900000))
|
|
||||||
|
|
||||||
print("Inserting Python datetime values...")
|
|
||||||
curs.execute("INSERT INTO test_dt VALUES (%s, %s, %s, %s, %s)", dt1)
|
|
||||||
|
|
||||||
# now extract the row from database and print them
|
|
||||||
print("Extracting values inserted with mx.DateTime wrappers:")
|
|
||||||
curs.execute("SELECT d, t, dt, z FROM test_dt WHERE k = 1")
|
|
||||||
for n, x in zip(mx1[1:], curs.fetchone()):
|
|
||||||
try:
|
|
||||||
# this will work only if psycopg has been compiled with datetime
|
|
||||||
# as the default typecaster for date/time values
|
|
||||||
s = repr(n) + "\n -> " + str(adapt(n)) + \
|
|
||||||
"\n -> " + repr(x) + "\n -> " + x.isoformat()
|
|
||||||
except:
|
|
||||||
s = repr(n) + "\n -> " + str(adapt(n)) + \
|
|
||||||
"\n -> " + repr(x) + "\n -> " + str(x)
|
|
||||||
print(s)
|
|
||||||
print()
|
|
||||||
|
|
||||||
print("Extracting values inserted with Python datetime wrappers:")
|
|
||||||
curs.execute("SELECT d, t, dt, z FROM test_dt WHERE k = 2")
|
|
||||||
for n, x in zip(dt1[1:], curs.fetchone()):
|
|
||||||
try:
|
|
||||||
# this will work only if psycopg has been compiled with datetime
|
|
||||||
# as the default typecaster for date/time values
|
|
||||||
s = repr(n) + "\n -> " + repr(x) + "\n -> " + x.isoformat()
|
|
||||||
except:
|
|
||||||
s = repr(n) + "\n -> " + repr(x) + "\n -> " + str(x)
|
|
||||||
print(s)
|
|
||||||
print()
|
|
||||||
|
|
||||||
curs.execute("DROP TABLE test_dt")
|
|
||||||
conn.commit()
|
|
||||||
|
|
@ -1,105 +0,0 @@
|
||||||
# encoding.py - show to change client encoding (and test it works)
|
|
||||||
# -*- encoding: utf8 -*-
|
|
||||||
#
|
|
||||||
# Copyright (C) 2004-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
import psycopg2.extensions
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Initial encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
print("\n** This example is supposed to be run in a UNICODE terminal! **\n")
|
|
||||||
|
|
||||||
print("Available encodings:")
|
|
||||||
encs = psycopg2.extensions.encodings.items()
|
|
||||||
encs.sort()
|
|
||||||
for a, b in encs:
|
|
||||||
print(" ", a, "<->", b)
|
|
||||||
|
|
||||||
print("Using STRING typecaster")
|
|
||||||
print("Setting backend encoding to LATIN1 and executing queries:")
|
|
||||||
conn.set_client_encoding('LATIN1')
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT %s::TEXT AS foo", ('àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", unicode(x, 'latin-1').encode('utf-8'), type(x))
|
|
||||||
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", unicode(x, 'latin-1').encode('utf-8'), type(x))
|
|
||||||
|
|
||||||
print("Setting backend encoding to UTF8 and executing queries:")
|
|
||||||
conn.set_client_encoding('UNICODE')
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù'.encode('utf-8'),))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x, type(x))
|
|
||||||
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x, type(x))
|
|
||||||
|
|
||||||
print("Using UNICODE typecaster")
|
|
||||||
psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
|
|
||||||
|
|
||||||
print("Setting backend encoding to LATIN1 and executing queries:")
|
|
||||||
conn.set_client_encoding('LATIN1')
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT %s::TEXT AS foo", ('àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x.encode('utf-8'), ":", type(x))
|
|
||||||
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x.encode('utf-8'), ":", type(x))
|
|
||||||
|
|
||||||
print("Setting backend encoding to UTF8 and executing queries:")
|
|
||||||
conn.set_client_encoding('UNICODE')
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù'.encode('utf-8'),))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x.encode('utf-8'), ":", type(x))
|
|
||||||
curs.execute("SELECT %s::TEXT AS foo", (u'àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x.encode('utf-8'), ":", type(x))
|
|
||||||
|
|
||||||
print("Executing full UNICODE queries")
|
|
||||||
|
|
||||||
print("Setting backend encoding to LATIN1 and executing queries:")
|
|
||||||
conn.set_client_encoding('LATIN1')
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute(u"SELECT %s::TEXT AS foo", ('àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x.encode('utf-8'), ":", type(x))
|
|
||||||
curs.execute(u"SELECT %s::TEXT AS foo", (u'àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x.encode('utf-8'), ":", type(x))
|
|
||||||
|
|
||||||
print("Setting backend encoding to UTF8 and executing queries:")
|
|
||||||
conn.set_client_encoding('UNICODE')
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute(u"SELECT %s::TEXT AS foo", (u'àèìòù'.encode('utf-8'),))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x.encode('utf-8'), ":", type(x))
|
|
||||||
curs.execute(u"SELECT %s::TEXT AS foo", (u'àèìòù',))
|
|
||||||
x = curs.fetchone()[0]
|
|
||||||
print(" ->", x.encode('utf-8'), ":", type(x))
|
|
||||||
|
|
@ -1,80 +0,0 @@
|
||||||
# fetch.py -- example about declaring cursors
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
curs = conn.cursor()
|
|
||||||
try:
|
|
||||||
curs.execute("CREATE TABLE test_fetch (val int4)")
|
|
||||||
except:
|
|
||||||
conn.rollback()
|
|
||||||
curs.execute("DROP TABLE test_fetch")
|
|
||||||
curs.execute("CREATE TABLE test_fetch (val int4)")
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
# we use this function to format the output
|
|
||||||
|
|
||||||
def flatten(l):
|
|
||||||
"""Flattens list of tuples l."""
|
|
||||||
return map(lambda x: x[0], l)
|
|
||||||
|
|
||||||
# insert 20 rows in the table
|
|
||||||
|
|
||||||
for i in range(20):
|
|
||||||
curs.execute("INSERT INTO test_fetch VALUES(%s)", (i,))
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
# does some nice tricks with the transaction and postgres cursors
|
|
||||||
# (remember to always commit or rollback before a DECLARE)
|
|
||||||
#
|
|
||||||
# we don't need to DECLARE ourselves, psycopg now supports named
|
|
||||||
# cursors (but we leave the code here, comments, as an example of
|
|
||||||
# what psycopg is doing under the hood)
|
|
||||||
#
|
|
||||||
#curs.execute("DECLARE crs CURSOR FOR SELECT * FROM test_fetch")
|
|
||||||
#curs.execute("FETCH 10 FROM crs")
|
|
||||||
#print "First 10 rows:", flatten(curs.fetchall())
|
|
||||||
#curs.execute("MOVE -5 FROM crs")
|
|
||||||
#print "Moved back cursor by 5 rows (to row 5.)"
|
|
||||||
#curs.execute("FETCH 10 FROM crs")
|
|
||||||
#print "Another 10 rows:", flatten(curs.fetchall())
|
|
||||||
#curs.execute("FETCH 10 FROM crs")
|
|
||||||
#print "The remaining rows:", flatten(curs.fetchall())
|
|
||||||
|
|
||||||
ncurs = conn.cursor("crs")
|
|
||||||
ncurs.execute("SELECT * FROM test_fetch")
|
|
||||||
print("First 10 rows:", flatten(ncurs.fetchmany(10)))
|
|
||||||
ncurs.scroll(-5)
|
|
||||||
print("Moved back cursor by 5 rows (to row 5.)")
|
|
||||||
print("Another 10 rows:", flatten(ncurs.fetchmany(10)))
|
|
||||||
print("Another one:", list(ncurs.fetchone()))
|
|
||||||
print("The remaining rows:", flatten(ncurs.fetchall()))
|
|
||||||
conn.rollback()
|
|
||||||
|
|
||||||
curs.execute("DROP TABLE test_fetch")
|
|
||||||
conn.commit()
|
|
||||||
|
|
@ -1,59 +0,0 @@
|
||||||
# lastrowid.py - example of using .lastrowid attribute
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys, psycopg2
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
curs = conn.cursor()
|
|
||||||
|
|
||||||
try:
|
|
||||||
curs.execute("CREATE TABLE test_oid (name text, surname text)")
|
|
||||||
except:
|
|
||||||
conn.rollback()
|
|
||||||
curs.execute("DROP TABLE test_oid")
|
|
||||||
curs.execute("CREATE TABLE test_oid (name text, surname text)")
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
data = ({'name':'Federico', 'surname':'Di Gregorio'},
|
|
||||||
{'name':'Pierluigi', 'surname':'Di Nunzio'})
|
|
||||||
|
|
||||||
curs.execute("""INSERT INTO test_oid
|
|
||||||
VALUES (%(name)s, %(surname)s)""", data[0])
|
|
||||||
|
|
||||||
foid = curs.lastrowid
|
|
||||||
print("Oid for %(name)s %(surname)s" % data[0], "is", foid)
|
|
||||||
|
|
||||||
curs.execute("""INSERT INTO test_oid
|
|
||||||
VALUES (%(name)s, %(surname)s)""", data[1])
|
|
||||||
moid = curs.lastrowid
|
|
||||||
print("Oid for %(name)s %(surname)s" % data[1], "is", moid)
|
|
||||||
|
|
||||||
curs.execute("SELECT * FROM test_oid WHERE oid = %s", (foid,))
|
|
||||||
print("Oid", foid, "selected %s %s" % curs.fetchone())
|
|
||||||
|
|
||||||
curs.execute("SELECT * FROM test_oid WHERE oid = %s", (moid,))
|
|
||||||
print("Oid", moid, "selected %s %s" % curs.fetchone())
|
|
||||||
|
|
||||||
curs.execute("DROP TABLE test_oid")
|
|
||||||
conn.commit()
|
|
||||||
|
|
@ -1,91 +0,0 @@
|
||||||
# lobject.py - lobject example
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2006 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
# this will create a large object with a new random oid, we'll
|
|
||||||
# use it to make some basic tests about read/write and seek.
|
|
||||||
lobj = conn.lobject()
|
|
||||||
loid = lobj.oid
|
|
||||||
print("Created a new large object with oid", loid)
|
|
||||||
|
|
||||||
print("Manually importing some binary data into the object:")
|
|
||||||
data = open("somehackers.jpg").read()
|
|
||||||
len = lobj.write(data)
|
|
||||||
print(" imported", len, "bytes of data")
|
|
||||||
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
print("Trying to (re)open large object with oid", loid)
|
|
||||||
lobj = conn.lobject(loid)
|
|
||||||
print("Manually exporting the data from the lobject:")
|
|
||||||
data1 = lobj.read()
|
|
||||||
len = lobj.tell()
|
|
||||||
lobj.seek(0, 0)
|
|
||||||
data2 = lobj.read()
|
|
||||||
if data1 != data2:
|
|
||||||
print("ERROR: read after seek returned different data")
|
|
||||||
open("somehackers_lobject1.jpg", 'wb').write(data1)
|
|
||||||
print(" written", len, "bytes of data to somehackers_lobject1.jpg")
|
|
||||||
|
|
||||||
lobj.unlink()
|
|
||||||
print("Large object with oid", loid, "removed")
|
|
||||||
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
# now we try to use the import and export functions to do the same
|
|
||||||
lobj = conn.lobject(0, 'n', 0, "somehackers.jpg")
|
|
||||||
loid = lobj.oid
|
|
||||||
print("Imported a new large object with oid", loid)
|
|
||||||
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
print("Trying to (re)open large object with oid", loid)
|
|
||||||
lobj = conn.lobject(loid, 'n')
|
|
||||||
print("Using export() to export the data from the large object:")
|
|
||||||
lobj.export("somehackers_lobject2.jpg")
|
|
||||||
print(" exported large object to somehackers_lobject2.jpg")
|
|
||||||
|
|
||||||
lobj.unlink()
|
|
||||||
print("Large object with oid", loid, "removed")
|
|
||||||
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
# this will create a very large object with a new random oid.
|
|
||||||
lobj = conn.lobject()
|
|
||||||
loid = lobj.oid
|
|
||||||
print("Created a new large object with oid", loid)
|
|
||||||
|
|
||||||
print("Manually importing a lot of data into the object:")
|
|
||||||
data = "data" * 1000000
|
|
||||||
len = lobj.write(data)
|
|
||||||
print(" imported", len, "bytes of data")
|
|
||||||
|
|
||||||
conn.rollback()
|
|
||||||
|
|
||||||
print("\nNow try to load the new images, to check it worked!")
|
|
||||||
|
|
@ -1,47 +0,0 @@
|
||||||
# mogrify.py - test all possible simple type mogrifications
|
|
||||||
# -*- encoding: latin1 -*-
|
|
||||||
#
|
|
||||||
# Copyright (C) 2004-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details..
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys, psycopg2
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':'bar'})
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':None})
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':True})
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':42})
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':u'yatt<EFBFBD>!'})
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':u'bar'})
|
|
||||||
|
|
||||||
print(curs.mogrify("SELECT %(foo)s AS foo", {'foo':'bar'}))
|
|
||||||
print(curs.mogrify("SELECT %(foo)s AS foo", {'foo':None}))
|
|
||||||
print(curs.mogrify("SELECT %(foo)s AS foo", {'foo':True}))
|
|
||||||
print(curs.mogrify("SELECT %(foo)s AS foo", {'foo':42}))
|
|
||||||
print(curs.mogrify("SELECT %(foo)s AS foo", {'foo':u'yatt<EFBFBD>!'}))
|
|
||||||
print(curs.mogrify("SELECT %(foo)s AS foo", {'foo':u'bar'}))
|
|
||||||
|
|
||||||
conn.rollback()
|
|
||||||
|
|
@ -1,126 +0,0 @@
|
||||||
"""
|
|
||||||
Using a tuple as a bound variable in "SELECT ... IN (...)" clauses
|
|
||||||
in PostgreSQL using psycopg2
|
|
||||||
|
|
||||||
Some time ago someone asked on the psycopg mailing list how to have a
|
|
||||||
bound variable expand to the right SQL for an SELECT IN clause:
|
|
||||||
|
|
||||||
SELECT * FROM atable WHERE afield IN (value1, value2, value3)
|
|
||||||
|
|
||||||
with the values to be used in the IN clause to be passed to the cursor
|
|
||||||
.execute() method in a tuple as a bound variable, i.e.:
|
|
||||||
|
|
||||||
in_values = ("value1", "value2", "value3")
|
|
||||||
curs.execute("SELECT ... IN %s", (in_values,))
|
|
||||||
|
|
||||||
psycopg 1 does support typecasting from Python to PostgreSQL (and back)
|
|
||||||
only for simple types and this problem has no elegant solution (short or
|
|
||||||
writing a wrapper class returning the pre-quoted text in an __str__
|
|
||||||
method.
|
|
||||||
|
|
||||||
But psycopg2 offers a simple and elegant solution by partially
|
|
||||||
implementing the Object Adaptation from PEP 246. psycopg2 moves
|
|
||||||
the type-casting logic into external adapters and a somehow
|
|
||||||
broken adapt() function.
|
|
||||||
|
|
||||||
While the original adapt() takes 3 arguments, psycopg2's one only takes
|
|
||||||
1: the bound variable to be adapted. The result is an object supporting
|
|
||||||
a not-yet well defined protocol that we can call ISQLQuote:
|
|
||||||
|
|
||||||
class ISQLQuote:
|
|
||||||
|
|
||||||
def getquoted(self):
|
|
||||||
"Returns a quoted string representing the bound variable."
|
|
||||||
|
|
||||||
def getbinary(self):
|
|
||||||
"Returns a binary quoted string representing the bound variable."
|
|
||||||
|
|
||||||
def getbuffer(self):
|
|
||||||
"Returns the wrapped object itself."
|
|
||||||
|
|
||||||
__str__ = getquoted
|
|
||||||
|
|
||||||
Then one of the functions (usually .getquoted()) is called by psycopg2 at
|
|
||||||
the right time to obtain the right, sql-quoted representation for the
|
|
||||||
corresponding bound variable.
|
|
||||||
|
|
||||||
The nice part is that the default, built-in adapters, derived from
|
|
||||||
psycopg 1 tyecasting code can be overridden by the programmer, simply
|
|
||||||
replacing them in the psycopg.extensions.adapters dictionary.
|
|
||||||
|
|
||||||
Then the solution to the original problem is now obvious: write an
|
|
||||||
adapter that adapts tuple objects into the right SQL string, by calling
|
|
||||||
recursively adapt() on each element.
|
|
||||||
|
|
||||||
psycopg2 development can be tracked on the psycopg mailing list:
|
|
||||||
|
|
||||||
http://lists.initd.org/mailman/listinfo/psycopg
|
|
||||||
|
|
||||||
"""
|
|
||||||
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
import psycopg2
|
|
||||||
import psycopg2.extensions
|
|
||||||
from psycopg2.extensions import adapt as psycoadapt
|
|
||||||
from psycopg2.extensions import register_adapter
|
|
||||||
|
|
||||||
class AsIs(object):
|
|
||||||
"""An adapter that just return the object 'as is'.
|
|
||||||
|
|
||||||
psycopg 1.99.9 has some optimizations that make impossible to call
|
|
||||||
adapt() without adding some basic adapters externally. This limitation
|
|
||||||
will be lifted in a future release.
|
|
||||||
"""
|
|
||||||
def __init__(self, obj):
|
|
||||||
self.__obj = obj
|
|
||||||
def getquoted(self):
|
|
||||||
return self.__obj
|
|
||||||
|
|
||||||
class SQL_IN(object):
|
|
||||||
"""Adapt a tuple to an SQL quotable object."""
|
|
||||||
|
|
||||||
def __init__(self, seq):
|
|
||||||
self._seq = seq
|
|
||||||
|
|
||||||
def prepare(self, conn):
|
|
||||||
pass
|
|
||||||
|
|
||||||
def getquoted(self):
|
|
||||||
# this is the important line: note how every object in the
|
|
||||||
# list is adapted and then how getquoted() is called on it
|
|
||||||
|
|
||||||
qobjs = [str(psycoadapt(o).getquoted()) for o in self._seq]
|
|
||||||
|
|
||||||
return '(' + ', '.join(qobjs) + ')'
|
|
||||||
|
|
||||||
__str__ = getquoted
|
|
||||||
|
|
||||||
|
|
||||||
# add our new adapter class to psycopg list of adapters
|
|
||||||
register_adapter(tuple, SQL_IN)
|
|
||||||
register_adapter(float, AsIs)
|
|
||||||
register_adapter(int, AsIs)
|
|
||||||
|
|
||||||
# usually we would call:
|
|
||||||
#
|
|
||||||
# conn = psycopg.connect("...")
|
|
||||||
# curs = conn.cursor()
|
|
||||||
# curs.execute("SELECT ...", (("this", "is", "the", "tuple"),))
|
|
||||||
#
|
|
||||||
# but we have no connection to a database right now, so we just check
|
|
||||||
# the SQL_IN class by calling psycopg's adapt() directly:
|
|
||||||
|
|
||||||
if __name__ == '__main__':
|
|
||||||
print("Note how the string will be SQL-quoted, but the number will not:")
|
|
||||||
print(psycoadapt(("this is an 'sql quoted' str\\ing", 1, 2.0)))
|
|
||||||
|
|
@ -1,45 +0,0 @@
|
||||||
# notify.py - example of getting notifies
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import select
|
|
||||||
import psycopg2
|
|
||||||
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
|
|
||||||
curs = conn.cursor()
|
|
||||||
|
|
||||||
curs.execute("listen test")
|
|
||||||
|
|
||||||
print("Waiting for 'NOTIFY test'")
|
|
||||||
while 1:
|
|
||||||
if select.select([conn],[],[],5)==([],[],[]):
|
|
||||||
print("Timeout")
|
|
||||||
else:
|
|
||||||
conn.poll()
|
|
||||||
while conn.notifies:
|
|
||||||
print("Got NOTIFY:", conn.notifies.pop())
|
|
||||||
|
|
@ -1,54 +0,0 @@
|
||||||
# simple.py - very simple example of plain DBAPI-2.0 usage
|
|
||||||
#
|
|
||||||
# currently used as test-me-stress-me script for psycopg 2.0
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
class SimpleQuoter(object):
|
|
||||||
def sqlquote(x=None):
|
|
||||||
return "'bar'"
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT 1 AS foo")
|
|
||||||
print(curs.fetchone())
|
|
||||||
curs.execute("SELECT 1 AS foo")
|
|
||||||
print(curs.fetchmany())
|
|
||||||
curs.execute("SELECT 1 AS foo")
|
|
||||||
print(curs.fetchall())
|
|
||||||
|
|
||||||
conn.rollback()
|
|
||||||
|
|
||||||
sys.exit(0)
|
|
||||||
|
|
||||||
curs.execute("SELECT 1 AS foo", async=1)
|
|
||||||
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':'bar'})
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':None})
|
|
||||||
curs.execute("SELECT %(foo)f AS foo", {'foo':42})
|
|
||||||
curs.execute("SELECT %(foo)s AS foo", {'foo':SimpleQuoter()})
|
|
||||||
Binary file not shown.
|
Before Width: | Height: | Size: 22 KiB |
|
|
@ -1,161 +0,0 @@
|
||||||
# threads.py -- example of multiple threads using psycopg
|
|
||||||
# -*- encoding: latin1 -*-
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## some others parameters
|
|
||||||
INSERT_THREADS = ('A', 'B', 'C')
|
|
||||||
SELECT_THREADS = ('1', '2')
|
|
||||||
|
|
||||||
ROWS = 1000
|
|
||||||
|
|
||||||
COMMIT_STEP = 20
|
|
||||||
SELECT_SIZE = 10000
|
|
||||||
SELECT_STEP = 500
|
|
||||||
SELECT_DIV = 250
|
|
||||||
|
|
||||||
# the available modes are:
|
|
||||||
# 0 - one connection for all inserts and one for all select threads
|
|
||||||
# 1 - connections generated using the connection pool
|
|
||||||
|
|
||||||
MODE = 1
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys, psycopg2, threading
|
|
||||||
from psycopg2.pool import ThreadedConnectionPool
|
|
||||||
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
if len(sys.argv) > 2:
|
|
||||||
MODE = int(sys.argv[2])
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
curs = conn.cursor()
|
|
||||||
|
|
||||||
try:
|
|
||||||
curs.execute("""CREATE TABLE test_threads (
|
|
||||||
name text, value1 int4, value2 float)""")
|
|
||||||
except:
|
|
||||||
conn.rollback()
|
|
||||||
curs.execute("DROP TABLE test_threads")
|
|
||||||
curs.execute("""CREATE TABLE test_threads (
|
|
||||||
name text, value1 int4, value2 float)""")
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
|
|
||||||
## this function inserts a big number of rows and creates and destroys
|
|
||||||
## a large number of cursors
|
|
||||||
|
|
||||||
def insert_func(conn_or_pool, rows):
|
|
||||||
name = threading.currentThread().getName()
|
|
||||||
|
|
||||||
if MODE == 0:
|
|
||||||
conn = conn_or_pool
|
|
||||||
else:
|
|
||||||
conn = conn_or_pool.getconn()
|
|
||||||
|
|
||||||
for i in range(rows):
|
|
||||||
if divmod(i, COMMIT_STEP)[1] == 0:
|
|
||||||
conn.commit()
|
|
||||||
if MODE == 1:
|
|
||||||
conn_or_pool.putconn(conn)
|
|
||||||
s = name + ": COMMIT STEP " + str(i)
|
|
||||||
print(s)
|
|
||||||
if MODE == 1:
|
|
||||||
conn = conn_or_pool.getconn()
|
|
||||||
c = conn.cursor()
|
|
||||||
try:
|
|
||||||
c.execute("INSERT INTO test_threads VALUES (%s, %s, %s)",
|
|
||||||
(str(i), i, float(i)))
|
|
||||||
except psycopg2.ProgrammingError as err:
|
|
||||||
print(name, ": an error occurred; skipping this insert")
|
|
||||||
print(err)
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
## a nice select function that prints the current number of rows in the
|
|
||||||
## database (and transfer them, putting some pressure on the network)
|
|
||||||
|
|
||||||
def select_func(conn_or_pool, z):
|
|
||||||
name = threading.currentThread().getName()
|
|
||||||
|
|
||||||
if MODE == 0:
|
|
||||||
conn = conn_or_pool
|
|
||||||
conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
|
|
||||||
|
|
||||||
for i in range(SELECT_SIZE):
|
|
||||||
if divmod(i, SELECT_STEP)[1] == 0:
|
|
||||||
try:
|
|
||||||
if MODE == 1:
|
|
||||||
conn = conn_or_pool.getconn()
|
|
||||||
conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
|
|
||||||
c = conn.cursor()
|
|
||||||
c.execute("SELECT * FROM test_threads WHERE value2 < %s",
|
|
||||||
(int(i/z),))
|
|
||||||
l = c.fetchall()
|
|
||||||
if MODE == 1:
|
|
||||||
conn_or_pool.putconn(conn)
|
|
||||||
s = name + ": number of rows fetched: " + str(len(l))
|
|
||||||
print(s)
|
|
||||||
except psycopg2.ProgrammingError as err:
|
|
||||||
print(name, ": an error occurred; skipping this select")
|
|
||||||
print(err)
|
|
||||||
|
|
||||||
## create the connection pool or the connections
|
|
||||||
if MODE == 0:
|
|
||||||
conn_insert = psycopg2.connect(DSN)
|
|
||||||
conn_select = psycopg2.connect(DSN)
|
|
||||||
else:
|
|
||||||
m = len(INSERT_THREADS) + len(SELECT_THREADS)
|
|
||||||
n = m/2
|
|
||||||
conn_insert = conn_select = ThreadedConnectionPool(n, m, DSN)
|
|
||||||
|
|
||||||
## create the threads
|
|
||||||
threads = []
|
|
||||||
|
|
||||||
print("Creating INSERT threads:")
|
|
||||||
for name in INSERT_THREADS:
|
|
||||||
t = threading.Thread(None, insert_func, 'Thread-'+name,
|
|
||||||
(conn_insert, ROWS))
|
|
||||||
t.setDaemon(0)
|
|
||||||
threads.append(t)
|
|
||||||
|
|
||||||
print("Creating SELECT threads:")
|
|
||||||
for name in SELECT_THREADS:
|
|
||||||
t = threading.Thread(None, select_func, 'Thread-'+name,
|
|
||||||
(conn_select, SELECT_DIV))
|
|
||||||
t.setDaemon(0)
|
|
||||||
threads.append(t)
|
|
||||||
|
|
||||||
## really start the threads now
|
|
||||||
for t in threads:
|
|
||||||
t.start()
|
|
||||||
|
|
||||||
# and wait for them to finish
|
|
||||||
for t in threads:
|
|
||||||
t.join()
|
|
||||||
print(t.getName(), "exited OK")
|
|
||||||
|
|
||||||
|
|
||||||
conn.commit()
|
|
||||||
curs.execute("SELECT count(name) FROM test_threads")
|
|
||||||
print("Inserted", curs.fetchone()[0], "rows.")
|
|
||||||
|
|
||||||
curs.execute("DROP TABLE test_threads")
|
|
||||||
conn.commit()
|
|
||||||
|
|
@ -1,65 +0,0 @@
|
||||||
# typecast.py - example of per-cursor and per-connection typecasters.
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
class SimpleQuoter(object):
|
|
||||||
def sqlquote(x=None):
|
|
||||||
return "'bar'"
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
import psycopg2.extensions
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT 'text'::text AS foo")
|
|
||||||
textoid = curs.description[0][1]
|
|
||||||
print("Oid for the text datatype is", textoid)
|
|
||||||
|
|
||||||
def castA(s, curs):
|
|
||||||
if s is not None: return "(A) " + s
|
|
||||||
TYPEA = psycopg2.extensions.new_type((textoid,), "TYPEA", castA)
|
|
||||||
|
|
||||||
def castB(s, curs):
|
|
||||||
if s is not None: return "(B) " + s
|
|
||||||
TYPEB = psycopg2.extensions.new_type((textoid,), "TYPEB", castB)
|
|
||||||
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT 'some text.'::text AS foo")
|
|
||||||
print("Some text from plain connection:", curs.fetchone()[0])
|
|
||||||
|
|
||||||
psycopg2.extensions.register_type(TYPEA, conn)
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT 'some text.'::text AS foo")
|
|
||||||
print("Some text from connection with typecaster:", curs.fetchone()[0])
|
|
||||||
|
|
||||||
curs = conn.cursor()
|
|
||||||
psycopg2.extensions.register_type(TYPEB, curs)
|
|
||||||
curs.execute("SELECT 'some text.'::text AS foo")
|
|
||||||
print("Some text from cursor with typecaster:", curs.fetchone()[0])
|
|
||||||
|
|
||||||
curs = conn.cursor()
|
|
||||||
curs.execute("SELECT 'some text.'::text AS foo")
|
|
||||||
print("Some text from connection with typecaster again:", curs.fetchone()[0])
|
|
||||||
|
|
@ -1,69 +0,0 @@
|
||||||
# tz.py - example of datetime objects with time zones
|
|
||||||
# -*- encoding: utf8 -*-
|
|
||||||
#
|
|
||||||
# Copyright (C) 2004-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
import datetime
|
|
||||||
|
|
||||||
from psycopg2.tz import ZERO, LOCAL, FixedOffsetTimezone
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
curs = conn.cursor()
|
|
||||||
|
|
||||||
try:
|
|
||||||
curs.execute("CREATE TABLE test_tz (t timestamp with time zone)")
|
|
||||||
except:
|
|
||||||
conn.rollback()
|
|
||||||
curs.execute("DROP TABLE test_tz")
|
|
||||||
curs.execute("CREATE TABLE test_tz (t timestamp with time zone)")
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
d = datetime.datetime(1971, 10, 19, 22, 30, 0, tzinfo=LOCAL)
|
|
||||||
curs.execute("INSERT INTO test_tz VALUES (%s)", (d,))
|
|
||||||
print("Inserted timestamp with timezone:", d)
|
|
||||||
print("Time zone:", d.tzinfo.tzname(d), "offset:", d.tzinfo.utcoffset(d))
|
|
||||||
|
|
||||||
tz = FixedOffsetTimezone(-5*60, "EST")
|
|
||||||
d = datetime.datetime(1971, 10, 19, 22, 30, 0, tzinfo=tz)
|
|
||||||
curs.execute("INSERT INTO test_tz VALUES (%s)", (d,))
|
|
||||||
print("Inserted timestamp with timezone:", d)
|
|
||||||
print("Time zone:", d.tzinfo.tzname(d), "offset:", d.tzinfo.utcoffset(d))
|
|
||||||
|
|
||||||
curs.execute("SELECT * FROM test_tz")
|
|
||||||
d = curs.fetchone()[0]
|
|
||||||
curs.execute("INSERT INTO test_tz VALUES (%s)", (d,))
|
|
||||||
print("Inserted SELECTed timestamp:", d)
|
|
||||||
print("Time zone:", d.tzinfo.tzname(d), "offset:", d.tzinfo.utcoffset(d))
|
|
||||||
|
|
||||||
curs.execute("SELECT * FROM test_tz")
|
|
||||||
for d in curs:
|
|
||||||
u = d[0].utcoffset() or ZERO
|
|
||||||
print("UTC time: ", d[0] - u)
|
|
||||||
print("Local time:", d[0])
|
|
||||||
print("Time zone:", d[0].tzinfo.tzname(d[0]), d[0].tzinfo.utcoffset(d[0]))
|
|
||||||
|
|
||||||
|
|
||||||
curs.execute("DROP TABLE test_tz")
|
|
||||||
conn.commit()
|
|
||||||
|
|
@ -1,126 +0,0 @@
|
||||||
# usercast.py -- example of user defined typecasters
|
|
||||||
# -*- encoding: latin-1 -*-
|
|
||||||
#
|
|
||||||
# Copyright (C) 2001-2010 Federico Di Gregorio <fog@debian.org>
|
|
||||||
#
|
|
||||||
# psycopg2 is free software: you can redistribute it and/or modify it
|
|
||||||
# under the terms of the GNU Lesser General Public License as published
|
|
||||||
# by the Free Software Foundation, either version 3 of the License, or
|
|
||||||
# (at your option) any later version.
|
|
||||||
#
|
|
||||||
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
|
|
||||||
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
||||||
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
||||||
# License for more details.
|
|
||||||
|
|
||||||
## put in DSN your DSN string
|
|
||||||
|
|
||||||
DSN = 'dbname=test'
|
|
||||||
|
|
||||||
## don't modify anything below this line (except for experimenting)
|
|
||||||
|
|
||||||
import sys
|
|
||||||
import psycopg2
|
|
||||||
import psycopg2.extensions
|
|
||||||
import whrandom
|
|
||||||
|
|
||||||
# importing psycopg.extras will give us a nice tuple adapter: this is wrong
|
|
||||||
# because the adapter is meant to be used in SQL IN clauses while we use
|
|
||||||
# tuples to represent points but it works and the example is about Rect, not
|
|
||||||
# "Point"
|
|
||||||
import psycopg2.extras
|
|
||||||
|
|
||||||
if len(sys.argv) > 1:
|
|
||||||
DSN = sys.argv[1]
|
|
||||||
|
|
||||||
print("Opening connection using dsn:", DSN)
|
|
||||||
conn = psycopg2.connect(DSN)
|
|
||||||
print("Initial encoding for this connection is", conn.encoding)
|
|
||||||
|
|
||||||
curs = conn.cursor()
|
|
||||||
try:
|
|
||||||
curs.execute("CREATE TABLE test_cast (p1 point, p2 point, b box)")
|
|
||||||
except:
|
|
||||||
conn.rollback()
|
|
||||||
curs.execute("DROP TABLE test_cast")
|
|
||||||
curs.execute("CREATE TABLE test_cast (p1 point, p2 point, b box)")
|
|
||||||
conn.commit()
|
|
||||||
|
|
||||||
# this is the callable object we use as a typecast (the typecast is
|
|
||||||
# usually a function, but we use a class, just to demonstrate the
|
|
||||||
# flexibility of the psycopg casting system
|
|
||||||
|
|
||||||
class Rect(object):
|
|
||||||
"""Very simple rectangle.
|
|
||||||
|
|
||||||
Note that we use this type as a data holder, as an adapter of itself for
|
|
||||||
the ISQLQuote protocol used by psycopg's adapt() (see __confrom__ below)
|
|
||||||
and eventually as a type-caster for the data extracted from the database
|
|
||||||
(that's why __init__ takes the curs argument.)
|
|
||||||
"""
|
|
||||||
|
|
||||||
def __init__(self, s=None, curs=None):
|
|
||||||
"""Init the rectangle from the optional string s."""
|
|
||||||
self.x = self.y = self.width = self.height = 0.0
|
|
||||||
if s: self.from_string(s)
|
|
||||||
|
|
||||||
def __conform__(self, proto):
|
|
||||||
"""This is a terrible hack, just ignore proto and return self."""
|
|
||||||
if proto == psycopg2.extensions.ISQLQuote:
|
|
||||||
return self
|
|
||||||
|
|
||||||
def from_points(self, x0, y0, x1, y1):
|
|
||||||
"""Init the rectangle from points."""
|
|
||||||
if x0 > x1: (x0, x1) = (x1, x0)
|
|
||||||
if y0 > y1: (y0, y1) = (y1, y0)
|
|
||||||
self.x = x0
|
|
||||||
self.y = y0
|
|
||||||
self.width = x1 - x0
|
|
||||||
self.height = y1 - y0
|
|
||||||
|
|
||||||
def from_string(self, s):
|
|
||||||
"""Init the rectangle from a string."""
|
|
||||||
seq = eval(s)
|
|
||||||
self.from_points(seq[0][0], seq[0][1], seq[1][0], seq[1][1])
|
|
||||||
|
|
||||||
def getquoted(self):
|
|
||||||
"""Format self as a string usable by the db to represent a box."""
|
|
||||||
s = "'((%d,%d),(%d,%d))'" % (
|
|
||||||
self.x, self.y, self.x + self.width, self.y + self.height)
|
|
||||||
return s
|
|
||||||
|
|
||||||
def show(self):
|
|
||||||
"""Format a description of the box."""
|
|
||||||
s = "X: %d\tY: %d\tWidth: %d\tHeight: %d" % (
|
|
||||||
self.x, self.y, self.width, self.height)
|
|
||||||
return s
|
|
||||||
|
|
||||||
# here we select from the empty table, just to grab the description
|
|
||||||
curs.execute("SELECT b FROM test_cast WHERE 0=1")
|
|
||||||
boxoid = curs.description[0][1]
|
|
||||||
print("Oid for the box datatype is", boxoid)
|
|
||||||
|
|
||||||
# and build the user cast object
|
|
||||||
BOX = psycopg2.extensions.new_type((boxoid,), "BOX", Rect)
|
|
||||||
psycopg2.extensions.register_type(BOX)
|
|
||||||
|
|
||||||
# now insert 100 random data (2 points and a box in each row)
|
|
||||||
for i in range(100):
|
|
||||||
p1 = (whrandom.randint(0,100), whrandom.randint(0,100))
|
|
||||||
p2 = (whrandom.randint(0,100), whrandom.randint(0,100))
|
|
||||||
b = Rect()
|
|
||||||
b.from_points(whrandom.randint(0,100), whrandom.randint(0,100),
|
|
||||||
whrandom.randint(0,100), whrandom.randint(0,100))
|
|
||||||
curs.execute("INSERT INTO test_cast VALUES ('%(p1)s', '%(p2)s', %(box)s)",
|
|
||||||
{'box':b, 'p1':p1, 'p2':p2})
|
|
||||||
print("Added 100 boxed to the database")
|
|
||||||
|
|
||||||
# select and print all boxes with at least one point inside
|
|
||||||
curs.execute("SELECT b FROM test_cast WHERE p1 @ b OR p2 @ b")
|
|
||||||
boxes = curs.fetchall()
|
|
||||||
print("Found %d boxes with at least a point inside:" % len(boxes))
|
|
||||||
for box in boxes:
|
|
||||||
print(" ", box[0].show())
|
|
||||||
|
|
||||||
curs.execute("DROP TABLE test_cast")
|
|
||||||
conn.commit()
|
|
||||||
Binary file not shown.
|
Before Width: | Height: | Size: 34 KiB |
|
|
@ -48,26 +48,6 @@
|
||||||
<None Include="setup.cfg" />
|
<None Include="setup.cfg" />
|
||||||
<None Include="setup.py" />
|
<None Include="setup.py" />
|
||||||
<None Include="doc\SUCCESS" />
|
<None Include="doc\SUCCESS" />
|
||||||
<None Include="examples\binary.py" />
|
|
||||||
<None Include="examples\copy_from.py" />
|
|
||||||
<None Include="examples\copy_to.py" />
|
|
||||||
<None Include="examples\cursor.py" />
|
|
||||||
<None Include="examples\dialtone.py" />
|
|
||||||
<None Include="examples\dict.py" />
|
|
||||||
<None Include="examples\dt.py" />
|
|
||||||
<None Include="examples\encoding.py" />
|
|
||||||
<None Include="examples\fetch.py" />
|
|
||||||
<None Include="examples\lastrowid.py" />
|
|
||||||
<None Include="examples\mogrify.py" />
|
|
||||||
<None Include="examples\myfirstrecipe.py" />
|
|
||||||
<None Include="examples\notify.py" />
|
|
||||||
<None Include="examples\simple.py" />
|
|
||||||
<None Include="examples\somehackers.jpg" />
|
|
||||||
<None Include="examples\threads.py" />
|
|
||||||
<None Include="examples\typecast.py" />
|
|
||||||
<None Include="examples\tz.py" />
|
|
||||||
<None Include="examples\usercast.py" />
|
|
||||||
<None Include="examples\whereareyou.jpg" />
|
|
||||||
<None Include="lib\errorcodes.py" />
|
<None Include="lib\errorcodes.py" />
|
||||||
<None Include="lib\extensions.py" />
|
<None Include="lib\extensions.py" />
|
||||||
<None Include="lib\extras.py" />
|
<None Include="lib\extras.py" />
|
||||||
|
|
@ -131,7 +111,6 @@
|
||||||
<None Include="tests\test_lobject.py" />
|
<None Include="tests\test_lobject.py" />
|
||||||
<None Include="tests\test_quote.py" />
|
<None Include="tests\test_quote.py" />
|
||||||
<None Include="psycopg\lobject.h" />
|
<None Include="psycopg\lobject.h" />
|
||||||
<None Include="sandbox\test_isready_connection_closed.py" />
|
|
||||||
<None Include="psycopg\adapter_pfloat.h" />
|
<None Include="psycopg\adapter_pfloat.h" />
|
||||||
<None Include="psycopg2da\adapter.py" />
|
<None Include="psycopg2da\adapter.py" />
|
||||||
<None Include="psycopg2da\configure.zcml" />
|
<None Include="psycopg2da\configure.zcml" />
|
||||||
|
|
@ -172,33 +151,8 @@
|
||||||
<None Include="tests\test_green.py" />
|
<None Include="tests\test_green.py" />
|
||||||
<None Include="tests\test_notify.py" />
|
<None Include="tests\test_notify.py" />
|
||||||
<None Include="scripts\make_errorcodes.py" />
|
<None Include="scripts\make_errorcodes.py" />
|
||||||
<None Include="sandbox\array.py" />
|
|
||||||
<None Include="sandbox\async.py" />
|
|
||||||
<None Include="sandbox\crash.py" />
|
|
||||||
<None Include="sandbox\domainoid.py" />
|
|
||||||
<None Include="sandbox\gtk.py" />
|
|
||||||
<None Include="sandbox\iter.py" />
|
|
||||||
<None Include="sandbox\leak.test.py" />
|
|
||||||
<None Include="sandbox\misc_dbapi_test.py" />
|
|
||||||
<None Include="sandbox\named.py" />
|
|
||||||
<None Include="sandbox\pbool.py" />
|
|
||||||
<None Include="sandbox\stress.py" />
|
|
||||||
<None Include="sandbox\stress2.py" />
|
|
||||||
<None Include="sandbox\test.py" />
|
|
||||||
<None Include="sandbox\test814.py" />
|
|
||||||
<None Include="sandbox\test_copy2.csv" />
|
|
||||||
<None Include="sandbox\test_copy2.py" />
|
|
||||||
<None Include="sandbox\test_notices.py" />
|
|
||||||
<None Include="sandbox\test-psycopg2-datetime-systematic.py" />
|
|
||||||
<None Include="sandbox\textfloat.py" />
|
|
||||||
<None Include="sandbox\trigger-commit-fail.py" />
|
|
||||||
<None Include="sandbox\trigger_double_dealloc.py" />
|
|
||||||
<None Include="sandbox\typecrash.py" />
|
|
||||||
<None Include="sandbox\tzhalf.py" />
|
|
||||||
<None Include="sandbox\valgrind-python.supp" />
|
|
||||||
<None Include="psycopg\green.h" />
|
<None Include="psycopg\green.h" />
|
||||||
<None Include="doc\src\pool.rst" />
|
<None Include="doc\src\pool.rst" />
|
||||||
<None Include="sandbox\dec2float.py" />
|
|
||||||
<None Include="psycopg\notify.h" />
|
<None Include="psycopg\notify.h" />
|
||||||
<None Include="psycopg\xid.h" />
|
<None Include="psycopg\xid.h" />
|
||||||
<None Include="tests\dbapi20_tpc.py" />
|
<None Include="tests\dbapi20_tpc.py" />
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue
Block a user