Add get_max_name_length() method to all backend/base.py

git-svn-id: http://code.djangoproject.com/svn/django/branches/boulder-oracle-sprint@3975 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/ado_mssql/base.py

@@ -134,6 +134,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return None
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',

django/db/backends/mysql/base.py

@@ -179,6 +179,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return None
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',

django/db/backends/oracle/base.py

@@ -128,6 +128,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return 30
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',

django/db/backends/postgresql/base.py

@@ -111,6 +111,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return None
+
 # Register these custom typecasts, because Django expects dates/times to be
 # in Python's native (standard-library) datetime/time format, whereas psycopg
 # use mx.DateTime by default.

django/db/backends/postgresql_psycopg2/base.py

@@ -104,6 +104,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return None
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'ILIKE %s',

django/db/backends/sqlite3/base.py

@@ -144,6 +144,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "NULL"
 
+def get_max_name_length():
+    return None
+
 def _sqlite_date_trunc(lookup_type, dt):
     try:
         dt = util.typecast_timestamp(dt)