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Code Issues 25 Releases Wiki Activity

Fixed #14149: Initialize the Oracle connection.operators at connection time since some systems don't seem to like the "TRANSLATE" trick.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@15299 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Ian Kelly 2011-01-24 21:34:18 +00:00
parent 42c31f6bf0
commit 91c61c0baa
1 changed files with 42 additions and 1 deletions
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43
django/db/backends/oracle/base.py
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@ -365,9 +365,24 @@ WHEN (new.%(col_name)s IS NULL)
return super(DatabaseOperations, self).combine_expression(connector, sub_expressions)
class _UninitializedOperatorsDescriptor(object):
def __get__(self, instance, owner):
# If connection.operators is looked up before a connection has been
# created, transparently initialize connection.operators to avert an
# AttributeError.
if instance is None:
raise AttributeError("operators not available as class attribute")
# Creating a cursor will initialize the operators.
instance.cursor().close()
return instance.__dict__['operators']
class DatabaseWrapper(BaseDatabaseWrapper):
vendor = 'oracle'
operators = {
operators = _UninitializedOperatorsDescriptor()
_standard_operators = {
'exact': '= %s',
'iexact': '= UPPER(%s)',
'contains': "LIKE TRANSLATE(%s USING NCHAR_CS) ESCAPE TRANSLATE('\\' USING NCHAR_CS)",
@ -382,6 +397,16 @@ class DatabaseWrapper(BaseDatabaseWrapper):
'iendswith': "LIKE UPPER(TRANSLATE(%s USING NCHAR_CS)) ESCAPE TRANSLATE('\\' USING NCHAR_CS)",
}
_likec_operators = _standard_operators.copy()
_likec_operators.update({
'contains': "LIKEC %s ESCAPE '\\'",
'icontains': "LIKEC UPPER(%s) ESCAPE '\\'",
'startswith': "LIKEC %s ESCAPE '\\'",
'endswith': "LIKEC %s ESCAPE '\\'",
'istartswith': "LIKEC UPPER(%s) ESCAPE '\\'",
'iendswith': "LIKEC UPPER(%s) ESCAPE '\\'",
})
def __init__(self, *args, **kwargs):
super(DatabaseWrapper, self).__init__(*args, **kwargs)
@ -426,6 +451,22 @@ class DatabaseWrapper(BaseDatabaseWrapper):
cursor.execute("ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS' "
"NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF' "
"NLS_TERRITORY = 'AMERICA'")
if 'operators' not in self.__dict__:
# Ticket #14149: Check whether our LIKE implementation will
# work for this connection or we need to fall back on LIKEC.
# This check is performed only once per DatabaseWrapper
# instance per thread, since subsequent connections will use
# the same settings.
try:
cursor.execute("SELECT 1 FROM DUAL WHERE DUMMY %s"
% self._standard_operators['contains'],
['X'])
except utils.DatabaseError:
self.operators = self._likec_operators
else:
self.operators = self._standard_operators
try:
self.oracle_version = int(self.connection.version.split('.')[0])
# There's no way for the DatabaseOperations class to know the