mirror of
https://github.com/psycopg/psycopg2.git
synced 2024-11-10 19:16:34 +03:00
Added basic sql module implementation
This commit is contained in:
Daniele Varrazzo
parent
fad5100079
commit
f11e6d82b0
174
lib/sql.py
174
lib/sql.py
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@ -23,3 +23,177 @@
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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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from psycopg2 import extensions as ext
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class Composible(object):
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"""Base class for objects that can be used to compose an SQL string."""
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def as_string(self, conn_or_curs):
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raise NotImplementedError
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def __add__(self, other):
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if isinstance(other, Composed):
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return Composed([self]) + other
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if isinstance(other, Composible):
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return Composed([self]) + Composed([other])
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else:
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return NotImplemented
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class Composed(Composible):
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def __init__(self, seq):
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self._seq = []
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for i in seq:
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if not isinstance(i, Composible):
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raise TypeError(
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"Composed elements must be Composible, got %r instead" % i)
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self._seq.append(i)
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def __repr__(self):
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return "sql.Composed(%r)" % (self.seq,)
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def as_string(self, conn_or_curs):
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rv = []
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for i in self._seq:
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rv.append(i.as_string(conn_or_curs))
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return ''.join(rv)
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def __add__(self, other):
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if isinstance(other, Composed):
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return Composed(self._seq + other._seq)
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if isinstance(other, Composible):
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return Composed(self._seq + [other])
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else:
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return NotImplemented
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def __mul__(self, n):
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return Composed(self._seq * n)
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def join(self, joiner):
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if isinstance(joiner, basestring):
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joiner = SQL(joiner)
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elif not isinstance(joiner, SQL):
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raise TypeError(
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"Composed.join() argument must be a string or an SQL")
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if len(self._seq) <= 1:
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return self
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it = iter(self._seq)
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rv = [it.next()]
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for i in it:
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rv.append(joiner)
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rv.append(i)
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return Composed(rv)
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class SQL(Composible):
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def __init__(self, wrapped):
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if not isinstance(wrapped, basestring):
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raise TypeError("SQL values must be strings")
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self._wrapped = wrapped
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def __repr__(self):
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return "sql.SQL(%r)" % (self._wrapped,)
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def as_string(self, conn_or_curs):
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return self._wrapped
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def __mul__(self, n):
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return Composed([self] * n)
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def join(self, seq):
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rv = []
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it = iter(seq)
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try:
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rv.append(it.next())
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except StopIteration:
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pass
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else:
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for i in it:
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rv.append(self)
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rv.append(i)
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return Composed(rv)
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class Identifier(Composible):
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def __init__(self, wrapped):
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if not isinstance(wrapped, basestring):
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raise TypeError("SQL identifiers must be strings")
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self._wrapped = wrapped
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@property
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def wrapped(self):
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return self._wrapped
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def __repr__(self):
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return "sql.Identifier(%r)" % (self._wrapped,)
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def as_string(self, conn_or_curs):
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return ext.quote_ident(self._wrapped, conn_or_curs)
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class Literal(Composible):
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def __init__(self, wrapped):
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self._wrapped = wrapped
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def __repr__(self):
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return "sql.Literal(%r)" % (self._wrapped,)
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def as_string(self, conn_or_curs):
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a = ext.adapt(self._wrapped)
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if hasattr(a, 'prepare'):
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# is it a connection or cursor?
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if isinstance(conn_or_curs, ext.connection):
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conn = conn_or_curs
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elif isinstance(conn_or_curs, ext.cursor):
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conn = conn_or_curs.connection
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else:
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raise TypeError("conn_or_curs must be a connection or a cursor")
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a.prepare(conn)
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return a.getquoted()
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def __mul__(self, n):
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return Composed([self] * n)
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class Placeholder(Composible):
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def __init__(self, name=None):
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if isinstance(name, basestring):
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if ')' in name:
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raise ValueError("invalid name: %r" % name)
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elif name is not None:
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raise TypeError("expected string or None as name, got %r" % name)
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self._name = name
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def __repr__(self):
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return "sql.Placeholder(%r)" % (
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self._name if self._name is not None else '',)
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def __mul__(self, n):
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return Composed([self] * n)
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def as_string(self, conn_or_curs):
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if self._name is not None:
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return "%%(%s)s" % self._name
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else:
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return "%s"
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def compose(sql, args=()):
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raise NotImplementedError
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# Alias
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PH = Placeholder
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# Literals
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NULL = SQL("NULL")
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DEFAULT = SQL("DEFAULT")
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@ -22,7 +22,228 @@
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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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from testutils import unittest
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import datetime as dt
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from testutils import unittest, ConnectingTestCase
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from psycopg2 import sql
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class ComposeTests(ConnectingTestCase):
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def test_pos(self):
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s = sql.compose("select %s from %s",
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(sql.Identifier('field'), sql.Identifier('table')))
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s1 = s.as_string(self.conn)
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self.assert_(isinstance(s1, str))
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self.assertEqual(s1, 'select "field" from "table"')
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def test_dict(self):
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s = sql.compose("select %(f)s from %(t)s",
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{'f': sql.Identifier('field'), 't': sql.Identifier('table')})
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s1 = s.as_string(self.conn)
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self.assert_(isinstance(s1, str))
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self.assertEqual(s1, 'select "field" from "table"')
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def test_unicode(self):
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s = sql.compose(u"select %s from %s",
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(sql.Identifier(u'field'), sql.Identifier('table')))
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s1 = s.as_string(self.conn)
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self.assert_(isinstance(s1, unicode))
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self.assertEqual(s1, u'select "field" from "table"')
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def test_compose_literal(self):
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s = sql.compose("select %s;", [sql.Literal(dt.date(2016, 12, 31))])
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s1 = s.as_string(self.conn)
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self.assertEqual(s1, "select '2016-12-31'::date;")
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def test_must_be_adaptable(self):
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class Foo(object):
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pass
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self.assertRaises(TypeError,
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sql.compose, "select %s;", [Foo()])
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def test_execute(self):
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cur = self.conn.cursor()
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cur.execute("""
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create table test_compose (
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id serial primary key,
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foo text, bar text, "ba'z" text)
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""")
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cur.execute(
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sql.compose("insert into %s (id, %s) values (%%s, %s)", [
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sql.Identifier('test_compose'),
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sql.SQL(', ').join(map(sql.Identifier, ['foo', 'bar', "ba'z"])),
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(sql.PH() * 3).join(', '),
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]),
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(10, 'a', 'b', 'c'))
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cur.execute("select * from test_compose")
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self.assertEqual(cur.fetchall(), [(10, 'a', 'b', 'c')])
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def test_executemany(self):
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cur = self.conn.cursor()
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cur.execute("""
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create table test_compose (
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id serial primary key,
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foo text, bar text, "ba'z" text)
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""")
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cur.executemany(
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sql.compose("insert into %s (id, %s) values (%%s, %s)", [
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sql.Identifier('test_compose'),
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sql.SQL(', ').join(map(sql.Identifier, ['foo', 'bar', "ba'z"])),
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(sql.PH() * 3).join(', '),
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]),
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[(10, 'a', 'b', 'c'), (20, 'd', 'e', 'f')])
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cur.execute("select * from test_compose")
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self.assertEqual(cur.fetchall(),
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[(10, 'a', 'b', 'c'), (20, 'd', 'e', 'f')])
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class IdentifierTests(ConnectingTestCase):
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def test_class(self):
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self.assert_(issubclass(sql.Identifier, sql.Composible))
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def test_init(self):
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self.assert_(isinstance(sql.Identifier('foo'), sql.Identifier))
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self.assert_(isinstance(sql.Identifier(u'foo'), sql.Identifier))
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self.assert_(isinstance(sql.Identifier(b'foo'), sql.Identifier))
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self.assertRaises(TypeError, sql.Identifier, 10)
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self.assertRaises(TypeError, sql.Identifier, dt.date(2016, 12, 31))
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def test_repr(self):
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obj = sql.Identifier("fo'o")
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self.assertEqual(repr(obj), 'sql.Identifier("fo\'o")')
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self.assertEqual(repr(obj), str(obj))
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def test_as_str(self):
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self.assertEqual(sql.Identifier('foo').as_string(self.conn), '"foo"')
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self.assertEqual(sql.Identifier("fo'o").as_string(self.conn), '"fo\'o"')
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def test_join(self):
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self.assert_(not hasattr(sql.Identifier('foo'), 'join'))
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class LiteralTests(ConnectingTestCase):
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def test_class(self):
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self.assert_(issubclass(sql.Literal, sql.Composible))
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def test_init(self):
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self.assert_(isinstance(sql.Literal('foo'), sql.Literal))
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self.assert_(isinstance(sql.Literal(u'foo'), sql.Literal))
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self.assert_(isinstance(sql.Literal(b'foo'), sql.Literal))
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self.assert_(isinstance(sql.Literal(42), sql.Literal))
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self.assert_(isinstance(
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sql.Literal(dt.date(2016, 12, 31)), sql.Literal))
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def test_repr(self):
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self.assertEqual(repr(sql.Literal("foo")), "sql.Literal('foo')")
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self.assertEqual(str(sql.Literal("foo")), "sql.Literal('foo')")
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self.assertEqual(
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sql.Literal("foo").as_string(self.conn).replace("E'", "'"),
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"'foo'")
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self.assertEqual(sql.Literal(42).as_string(self.conn), "42")
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self.assertEqual(
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sql.Literal(dt.date(2017, 1, 1)).as_string(self.conn),
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"'2017-01-01'::date")
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class SQLTests(ConnectingTestCase):
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def test_class(self):
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self.assert_(issubclass(sql.SQL, sql.Composible))
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def test_init(self):
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self.assert_(isinstance(sql.SQL('foo'), sql.SQL))
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self.assert_(isinstance(sql.SQL(u'foo'), sql.SQL))
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self.assert_(isinstance(sql.SQL(b'foo'), sql.SQL))
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self.assertRaises(TypeError, sql.SQL, 10)
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self.assertRaises(TypeError, sql.SQL, dt.date(2016, 12, 31))
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def test_str(self):
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self.assertEqual(repr(sql.SQL("foo")), "sql.SQL('foo')")
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self.assertEqual(str(sql.SQL("foo")), "sql.SQL('foo')")
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self.assertEqual(sql.SQL("foo").as_string(self.conn), "foo")
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def test_sum(self):
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obj = sql.SQL("foo") + sql.SQL("bar")
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self.assert_(isinstance(obj, sql.Composed))
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self.assertEqual(obj.as_string(self.conn), "foobar")
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def test_sum_inplace(self):
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obj = sql.SQL("foo")
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obj += sql.SQL("bar")
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self.assert_(isinstance(obj, sql.Composed))
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self.assertEqual(obj.as_string(self.conn), "foobar")
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def test_multiply(self):
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obj = sql.SQL("foo") * 3
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self.assert_(isinstance(obj, sql.Composed))
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self.assertEqual(obj.as_string(self.conn), "foofoofoo")
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def test_join(self):
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obj = sql.SQL(", ").join(
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[sql.Identifier('foo'), sql.SQL('bar'), sql.Literal(42)])
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self.assert_(isinstance(obj, sql.Composed))
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self.assertEqual(obj.as_string(self.conn), '"foo", bar, 42')
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class ComposedTest(ConnectingTestCase):
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def test_class(self):
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self.assert_(issubclass(sql.Composed, sql.Composible))
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def test_join(self):
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obj = sql.Composed([sql.Literal("foo"), sql.Identifier("b'ar")])
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obj = obj.join(", ")
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self.assert_(isinstance(obj, sql.Composed))
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self.assertEqual(obj.as_string(self.conn), "'foo', \"b'ar\"")
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def test_sum(self):
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obj = sql.Composed([sql.SQL("foo ")])
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obj = obj + sql.Literal("bar")
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self.assert_(isinstance(obj, sql.Composed))
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self.assertEqual(obj.as_string(self.conn), "foo 'bar'")
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def test_sum_inplace(self):
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obj = sql.Composed([sql.SQL("foo ")])
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obj += sql.Literal("bar")
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self.assert_(isinstance(obj, sql.Composed))
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self.assertEqual(obj.as_string(self.conn), "foo 'bar'")
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obj = sql.Composed([sql.SQL("foo ")])
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obj += sql.Composed([sql.Literal("bar")])
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self.assert_(isinstance(obj, sql.Composed))
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self.assertEqual(obj.as_string(self.conn), "foo 'bar'")
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class PlaceholderTest(ConnectingTestCase):
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def test_class(self):
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self.assert_(issubclass(sql.Placeholder, sql.Composible))
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def test_alias(self):
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self.assert_(sql.Placeholder is sql.PH)
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def test_repr(self):
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self.assert_(str(sql.Placeholder()), 'sql.Placeholder()')
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self.assert_(repr(sql.Placeholder()), 'sql.Placeholder()')
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self.assert_(sql.Placeholder().as_string(self.conn), '%s')
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def test_repr_name(self):
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self.assert_(str(sql.Placeholder('foo')), "sql.Placeholder('foo')")
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self.assert_(repr(sql.Placeholder('foo')), "sql.Placeholder('foo')")
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self.assert_(sql.Placeholder('foo').as_string(self.conn), '%(foo)s')
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def test_bad_name(self):
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self.assertRaises(ValueError, sql.Placeholder, ')')
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class ValuesTest(ConnectingTestCase):
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def test_null(self):
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self.assert_(isinstance(sql.NULL, sql.SQL))
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self.assertEqual(sql.NULL.as_string(self.conn), "NULL")
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def test_default(self):
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self.assert_(isinstance(sql.DEFAULT, sql.SQL))
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self.assertEqual(sql.DEFAULT.as_string(self.conn), "DEFAULT")
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def test_suite():
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