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Make Column picklable on Python >= 3.3

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Also expose the type from the extensions module, not from the main
module.
This commit is contained in:
Daniele Varrazzo 2015-02-08 11:27:10 +00:00
parent 9f7cd6b374
commit a2a5461c28
3 changed files with 20 additions and 5 deletions
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1
lib/__init__.py
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@ -55,7 +55,6 @@ from psycopg2._psycopg import DateFromTicks, TimeFromTicks, TimestampFromTicks
from psycopg2._psycopg import Error, Warning, DataError, DatabaseError, ProgrammingError
from psycopg2._psycopg import IntegrityError, InterfaceError, InternalError
from psycopg2._psycopg import NotSupportedError, OperationalError
from psycopg2._psycopg import Column
from psycopg2._psycopg import _connect, apilevel, threadsafety, paramstyle
from psycopg2._psycopg import __version__

2
lib/extensions.py
View File

@ -58,7 +58,7 @@ except ImportError:
from psycopg2._psycopg import adapt, adapters, encodings, connection, cursor, lobject, Xid
from psycopg2._psycopg import string_types, binary_types, new_type, new_array_type, register_type
from psycopg2._psycopg import ISQLQuote, Notify, Diagnostics
from psycopg2._psycopg import ISQLQuote, Notify, Diagnostics, Column
from psycopg2._psycopg import QueryCanceledError, TransactionRollbackError

22
psycopg/psycopgmodule.c
View File

@ -625,8 +625,10 @@ psyco_GetDecimalType(void)
static PyObject *
psyco_make_description_type(void)
{
PyObject *nt = NULL;
PyObject *coll = NULL;
PyObject *nt = NULL;
PyTypeObject *t = NULL;
PyObject *s = NULL;
PyObject *rv = NULL;
/* Try to import collections.namedtuple */
@ -640,12 +642,26 @@ psyco_make_description_type(void)
}
/* Build the namedtuple */
rv = PyObject_CallFunction(nt, "ss", "Column",
"name type_code display_size internal_size precision scale null_ok");
if(!(t = (PyTypeObject *)PyObject_CallFunction(nt, "ss", "Column",
"name type_code display_size internal_size precision scale null_ok"))) {
goto exit;
}
/* Export the tuple on the extensions module
* Required to guarantee picklability on Py > 3.3 (see Python issue 21374)
* for previous Py version the module is psycopg2 anyway but for consistency
* we'd rather expose it from the extensions module. */
if (!(s = Text_FromUTF8("psycopg2.extensions"))) { goto exit; }
if (0 > PyDict_SetItemString(t->tp_dict, "__module__", s)) { goto exit; }
rv = (PyObject *)t;
t = NULL;
exit:
Py_XDECREF(coll);
Py_XDECREF(nt);
Py_XDECREF((PyObject *)t);
Py_XDECREF(s);
return rv;