Ticket #3053: django_clear.patch

core/management.py

@@ -273 +273 @@
 def get_sql_delete(app):
     "Returns a list of the DROP TABLE SQL statements for the given app."
     from django.db import backend, connection, models, get_introspection_module
+    from django.db.backends.util import truncate_name
     introspection = get_introspection_module()
 
     # This should work even if a connecton isn't available
@@ -319 +320 @@
                     col = f.column
                     r_table = model._meta.db_table
                     r_col = model._meta.get_field(f.rel.field_name).column
+                    r_name = '%s_refs_%s_%s_%s' % (col, r_col, table, r_table)
                     output.append('%s %s %s %s;' % \
                         (style.SQL_KEYWORD('ALTER TABLE'),
                         style.SQL_TABLE(backend.quote_name(table)),
                         style.SQL_KEYWORD(backend.get_drop_foreignkey_sql()),
-                        style.SQL_FIELD(backend.quote_name('%s_refs_%s_%x' % (col, r_col, abs(hash((table, r_table))))))))
+                        style.SQL_FIELD(truncate_name(r_name, backend.get_max_name_length()))))
                 del references_to_delete[model]
+            if hasattr(backend, 'get_drop_sequence'):
+                output.append(backend.get_drop_sequence(model._meta.db_table))
 
     # Output DROP TABLE statements for many-to-many tables.
     for model in app_models:
@@ -333 +337 @@
             if cursor and table_name_converter(f.m2m_db_table()) in table_names:
                 output.append("%s %s;" % (style.SQL_KEYWORD('DROP TABLE'),
                     style.SQL_TABLE(backend.quote_name(f.m2m_db_table()))))
+                if hasattr(backend, 'get_drop_sequence'):
+                    output.append(backend.get_drop_sequence("%s_%s"%(model._meta.db_table, f.column)))
 
     app_label = app_models[0]._meta.app_label
 

db/backends/oracle/base.py

@@ -144 +144 @@
     raise NotImplementedError
 
 def get_drop_foreignkey_sql():
-    return "DROP FOREIGN KEY"
+    return "DROP CONSTRAINT"
 
 def get_pk_default_value():
     return "DEFAULT"
@@ -168 +168 @@
     END;\n""" % (tr_name, quote_name(table), sq_name)
     return sequence_sql, trigger_sql
 
+def get_drop_sequence(table):
+    name_length = get_max_name_length() - 3
+    sq_name = '%s_sq' % util.truncate_name(table, name_length)
+    drop_sequence_sql = 'DROP SEQUENCE %s;' % sq_name
+    return drop_sequence_sql
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': "LIKE %s ESCAPE '\\'",