Refactored get_start_transaction_sql() to DatabaseOperations.start_transaction_sql(). Refs #5106

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5965 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/management/base.py

@@ -34,9 +34,9 @@ class BaseCommand(object):
             if output:
                 if self.output_transaction:
                     # This needs to be imported here, because it relies on settings.
-                    from django.db import backend
+                    from django.db import connection
-                    if backend.get_start_transaction_sql():
+                    if connection.ops.start_transaction_sql():
-                        print self.style.SQL_KEYWORD(backend.get_start_transaction_sql())
+                        print self.style.SQL_KEYWORD(connection.ops.start_transaction_sql())
                 print output
                 if self.output_transaction:
                     print self.style.SQL_KEYWORD("COMMIT;")

django/db/backends/__init__.py

@@ -160,3 +160,9 @@ class BaseDatabaseOperations(object):
         color_style() or no_style() in django.core.management.color.
         """
         return [] # No sequence reset required by default.
+
+    def start_transaction_sql(self):
+        """
+        Returns the SQL statement required to start a transaction.
+        """
+        return "BEGIN;"

django/db/backends/ado_mssql/base.py

@@ -103,9 +103,6 @@ dictfetchone = util.dictfetchone
 dictfetchmany = util.dictfetchmany
 dictfetchall  = util.dictfetchall
 
-def get_start_transaction_sql():
-    return "BEGIN;"
-
 def get_tablespace_sql(tablespace, inline=False):
     return "ON %s" % quote_name(tablespace)
 

django/db/backends/dummy/base.py

@@ -43,6 +43,5 @@ quote_name = complain
 dictfetchone = complain
 dictfetchmany = complain
 dictfetchall = complain
-get_start_transaction_sql = complain
 
 OPERATOR_MAPPING = {}

django/db/backends/mysql/base.py

@@ -188,9 +188,6 @@ dictfetchone = util.dictfetchone
 dictfetchmany = util.dictfetchmany
 dictfetchall  = util.dictfetchall
 
-def get_start_transaction_sql():
-    return "BEGIN;"
-
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',

django/db/backends/mysql_old/base.py

@@ -207,9 +207,6 @@ dictfetchone = util.dictfetchone
 dictfetchmany = util.dictfetchmany
 dictfetchall  = util.dictfetchall
 
-def get_start_transaction_sql():
-    return "BEGIN;"
-
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',

django/db/backends/oracle/base.py

@@ -112,6 +112,9 @@ class DatabaseOperations(BaseDatabaseOperations):
                                        'table':f.m2m_db_table()})
         return output
 
+    def start_transaction_sql(self):
+        return ''
+
 class DatabaseWrapper(BaseDatabaseWrapper):
     ops = DatabaseOperations()
 
@@ -228,9 +231,6 @@ def get_field_cast_sql(db_type):
     else:
         return "%s%s"
 
-def get_start_transaction_sql():
-    return None
-
 def get_tablespace_sql(tablespace, inline=False):
     return "%sTABLESPACE %s" % ((inline and "USING INDEX " or ""), quote_name(tablespace))
 

django/db/backends/postgresql/base.py

@@ -211,9 +211,6 @@ def dictfetchall(cursor):
     "Returns all rows from a cursor as a dict"
     return cursor.dictfetchall()
 
-def get_start_transaction_sql():
-    return "BEGIN;"
-
 def typecast_string(s):
     """
     Cast all returned strings to unicode strings.

django/db/backends/postgresql_psycopg2/base.py

@@ -165,9 +165,6 @@ dictfetchone = util.dictfetchone
 dictfetchmany = util.dictfetchmany
 dictfetchall = util.dictfetchall
 
-def get_start_transaction_sql():
-    return "BEGIN;"
-
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'ILIKE %s',

django/db/backends/sqlite3/base.py

@@ -131,9 +131,6 @@ def _sqlite_extract(lookup_type, dt):
         return None
     return str(getattr(dt, lookup_type))
 
-def get_start_transaction_sql():
-    return "BEGIN;"
-
 def _sqlite_date_trunc(lookup_type, dt):
     try:
         dt = util.typecast_timestamp(dt)