boulder-oracle-sprint: Call each backend for its version of "BEGIN;" to start

a transaction.  Previously, Oracle saw the output of "./manage.py 
sqlall" as starting a PL/SQL function definition.


git-svn-id: http://code.djangoproject.com/svn/django/branches/boulder-oracle-sprint@4758 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/management.py

@@ -1542,6 +1542,8 @@ def print_error(msg, cmd):
     sys.exit(1)
 
 def execute_from_command_line(action_mapping=DEFAULT_ACTION_MAPPING, argv=None):
+    from django.db import backend
+    
     # Use sys.argv if we've not passed in a custom argv
     if argv is None:
         argv = sys.argv
@@ -1652,7 +1654,7 @@ def execute_from_command_line(action_mapping=DEFAULT_ACTION_MAPPING, argv=None):
         if not mod_list:
             parser.print_usage_and_exit()
         if action not in NO_SQL_TRANSACTION:
-            print style.SQL_KEYWORD("BEGIN;")
+            print style.SQL_KEYWORD(backend.get_start_transaction_sql())
         for mod in mod_list:
             if action == 'reset':
                 output = action_mapping[action](mod, options.interactive)

django/db/backends/ado_mssql/base.py

@@ -149,6 +149,9 @@ def get_pk_default_value():
 def get_max_name_length():
     return None
 
+def get_start_transaction_sql():
+    return "BEGIN;"
+
 def get_autoinc_sql(table):
     return None
 

django/db/backends/mysql/base.py

@@ -194,6 +194,9 @@ def get_pk_default_value():
 def get_max_name_length():
     return 64;
 
+def get_start_transaction_sql():
+    return "BEGIN;"
+
 def get_autoinc_sql(table):
     return None
 

django/db/backends/oracle/base.py

@@ -168,6 +168,9 @@ def get_pk_default_value():
 def get_max_name_length():
     return 30
 
+def get_start_transaction_sql():
+    return ""
+
 def get_autoinc_sql(table):
     # To simulate auto-incrementing primary keys in Oracle, we have to
     # create a sequence and a trigger.

django/db/backends/postgresql/base.py

@@ -169,6 +169,9 @@ def get_pk_default_value():
 def get_max_name_length():
     return None
 
+def get_start_transaction_sql():
+    return "BEGIN;"
+
 def get_autoinc_sql(table):
     return None
 

django/db/backends/postgresql_psycopg2/base.py

@@ -129,6 +129,9 @@ def get_pk_default_value():
 def get_max_name_length():
     return None
 
+def get_start_transaction_sql():
+    return "BEGIN;"
+
 def get_autoinc_sql(table):
     return None
 

django/db/backends/sqlite3/base.py

@@ -163,6 +163,9 @@ def get_pk_default_value():
 def get_max_name_length():
     return None
 
+def get_start_transaction_sql():
+    return "BEGIN;"
+
 def get_autoinc_sql(table):
     return None