Refactored get_datetime_cast_sql() to DatabaseOperations.datetime_cast_sql(). Refs #5106

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5953 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/__init__.py

@@ -68,3 +68,10 @@ class BaseDatabaseOperations(object):
         the given specificity.
         """
         raise NotImplementedError()
+
+    def datetime_cast_sql(self):
+        """
+        Returns the SQL necessary to cast a datetime value so that it will be
+        retrieved as a Python datetime object instead of a string.
+        """
+        return None

django/db/backends/ado_mssql/base.py

@@ -97,9 +97,6 @@ def get_last_insert_id(cursor, table_name, pk_name):
     cursor.execute("SELECT %s FROM %s WHERE %s = @@IDENTITY" % (pk_name, table_name, pk_name))
     return cursor.fetchone()[0]
 
-def get_datetime_cast_sql():
-    return None
-
 def get_limit_offset_sql(limit, offset=None):
     # TODO: This is a guess. Make sure this is correct.
     sql = "LIMIT %s" % limit

django/db/backends/dummy/base.py

@@ -44,7 +44,6 @@ dictfetchone = complain
 dictfetchmany = complain
 dictfetchall = complain
 get_last_insert_id = complain
-get_datetime_cast_sql = complain
 get_limit_offset_sql = complain
 get_random_function_sql = complain
 get_deferrable_sql = complain

django/db/backends/mysql/base.py

@@ -152,9 +152,6 @@ dictfetchall  = util.dictfetchall
 def get_last_insert_id(cursor, table_name, pk_name):
     return cursor.lastrowid
 
-def get_datetime_cast_sql():
-    return None
-
 def get_limit_offset_sql(limit, offset=None):
     sql = "LIMIT "
     if offset and offset != 0:

django/db/backends/mysql_old/base.py

@@ -171,9 +171,6 @@ dictfetchall  = util.dictfetchall
 def get_last_insert_id(cursor, table_name, pk_name):
     return cursor.lastrowid
 
-def get_datetime_cast_sql():
-    return None
-
 def get_limit_offset_sql(limit, offset=None):
     sql = "LIMIT "
     if offset and offset != 0:

django/db/backends/oracle/base.py

@@ -51,6 +51,9 @@ class DatabaseOperations(BaseDatabaseOperations):
             sql = "TRUNC(%s, '%s')" % (field_name, lookup_type)
         return sql
 
+    def datetime_cast_sql(self):
+        return "TO_TIMESTAMP(%s, 'YYYY-MM-DD HH24:MI:SS.FF')"
+
 class DatabaseWrapper(BaseDatabaseWrapper):
     ops = DatabaseOperations()
 
@@ -166,9 +169,6 @@ def get_last_insert_id(cursor, table_name, pk_name):
     cursor.execute('SELECT %s_sq.currval FROM dual' % sq_name)
     return cursor.fetchone()[0]
 
-def get_datetime_cast_sql():
-    return "TO_TIMESTAMP(%s, 'YYYY-MM-DD HH24:MI:SS.FF')"
-
 def get_field_cast_sql(db_type):
     if db_type.endswith('LOB'):
         return "DBMS_LOB.SUBSTR(%s%s)"

django/db/backends/postgresql/base.py

@@ -128,9 +128,6 @@ def get_last_insert_id(cursor, table_name, pk_name):
     cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
     return cursor.fetchone()[0]
 
-def get_datetime_cast_sql():
-    return None
-
 def get_limit_offset_sql(limit, offset=None):
     sql = "LIMIT %s" % limit
     if offset and offset != 0:

django/db/backends/postgresql_psycopg2/base.py

@@ -82,9 +82,6 @@ def get_last_insert_id(cursor, table_name, pk_name):
     cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
     return cursor.fetchone()[0]
 
-def get_datetime_cast_sql():
-    return None
-
 def get_limit_offset_sql(limit, offset=None):
     sql = "LIMIT %s" % limit
     if offset and offset != 0:

django/db/backends/sqlite3/base.py

@@ -115,9 +115,6 @@ def _sqlite_extract(lookup_type, dt):
         return None
     return str(getattr(dt, lookup_type))
 
-def get_datetime_cast_sql():
-    return None
-
 def get_limit_offset_sql(limit, offset=None):
     sql = "LIMIT %s" % limit
     if offset and offset != 0:

django/db/models/query.py

@@ -780,8 +780,8 @@ def get_where_clause(lookup_type, table_prefix, field_name, value, db_type):
     if table_prefix.endswith('.'):
         table_prefix = backend.quote_name(table_prefix[:-1])+'.'
     field_name = backend.quote_name(field_name)
-    if type(value) == datetime.datetime and backend.get_datetime_cast_sql():
-        cast_sql = backend.get_datetime_cast_sql()
+    if type(value) == datetime.datetime and connection.ops.datetime_cast_sql():
+        cast_sql = connection.ops.datetime_cast_sql()
     else:
         cast_sql = '%s'
     if db_type and hasattr(backend, 'get_field_cast_sql'):
@@ -794,8 +794,7 @@ def get_where_clause(lookup_type, table_prefix, field_name, value, db_type):
     else:
         format = '%s %s'
     try:
-        return format % (field_sql,
-                         backend.OPERATOR_MAPPING[lookup_type] % cast_sql)
+        return format % (field_sql, backend.OPERATOR_MAPPING[lookup_type] % cast_sql)
     except KeyError:
         pass
     if lookup_type == 'in':