First stab at MySQL support
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@ -37,6 +37,7 @@ from django.db.backends.mysql.client import DatabaseClient
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from django.db.backends.mysql.creation import DatabaseCreation
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from django.db.backends.mysql.introspection import DatabaseIntrospection
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from django.db.backends.mysql.validation import DatabaseValidation
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from django.db.backends.mysql.schema import DatabaseSchemaEditor
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from django.utils.functional import cached_property
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from django.utils.safestring import SafeString, SafeUnicode
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from django.utils import six
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@ -488,3 +489,7 @@ class DatabaseWrapper(BaseDatabaseWrapper):
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% (table_name, bad_row[0],
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table_name, column_name, bad_row[1],
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referenced_table_name, referenced_column_name))
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def schema_editor(self):
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"Returns a new instance of this backend's SchemaEditor"
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return DatabaseSchemaEditor(self)
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@ -102,3 +102,35 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
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indexes[row[4]] = {'primary_key': (row[2] == 'PRIMARY'), 'unique': not bool(row[1])}
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return indexes
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def get_constraints(self, cursor, table_name):
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"""
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Retrieves any constraints (unique, pk, fk, check) across one or more columns.
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Returns {'cnname': {'columns': set(columns), 'primary_key': bool, 'unique': bool}}
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"""
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constraints = {}
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# Loop over the constraint tables, collecting things as constraints
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ifsc_tables = ["constraint_column_usage", "key_column_usage"]
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for ifsc_table in ifsc_tables:
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cursor.execute("""
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SELECT kc.constraint_name, kc.column_name, c.constraint_type
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FROM information_schema.%s AS kc
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JOIN information_schema.table_constraints AS c ON
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kc.table_schema = c.table_schema AND
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kc.table_name = c.table_name AND
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kc.constraint_name = c.constraint_name
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WHERE
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kc.table_schema = %%s AND
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kc.table_name = %%s
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""" % ifsc_table, [self.connection.settings_dict['NAME'], table_name])
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for constraint, column, kind in cursor.fetchall():
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# If we're the first column, make the record
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if constraint not in constraints:
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constraints[constraint] = {
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"columns": set(),
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"primary_key": kind.lower() == "primary key",
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"foreign_key": kind.lower() == "foreign key",
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"unique": kind.lower() in ["primary key", "unique"],
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}
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# Record the details
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constraints[constraint]['columns'].add(column)
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return constraints
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@ -0,0 +1,24 @@
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from django.db.backends.schema import BaseDatabaseSchemaEditor
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class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
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sql_rename_table = "RENAME TABLE %(old_table)s TO %(new_table)s"
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sql_alter_column_null = "MODIFY %(column)s %(type)s NULL"
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sql_alter_column_not_null = "MODIFY %(column)s %(type)s NULL"
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sql_delete_unique = "ALTER TABLE %(table)s DROP INDEX %(name)s"
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sql_create_fk = "ALTER TABLE %(table)s ADD CONSTRAINT %(name)s FOREIGN KEY (%(column)s) REFERENCES %(to_table)s (%(to_column)s)"
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sql_delete_fk = "ALTER TABLE %(table)s DROP FOREIGN KEY %(name)s"
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sql_delete_index = "DROP INDEX %(name)s ON %(table_name)s"
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sql_delete_pk = "ALTER TABLE %(table)s DROP PRIMARY KEY"
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alter_string_set_null = 'MODIFY %(column)s %(type)s NULL;'
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alter_string_drop_null = 'MODIFY %(column)s %(type)s NOT NULL;'
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@ -91,7 +91,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
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def get_constraints(self, cursor, table_name):
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"""
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Retrieves any constraints (unique, pk, check) across one or more columns.
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Retrieves any constraints (unique, pk, fk, check) across one or more columns.
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Returns {'cnname': {'columns': set(columns), 'primary_key': bool, 'unique': bool}}
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"""
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constraints = {}
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@ -167,7 +167,6 @@ class SchemaTests(TestCase):
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# Ensure the field is right to begin with
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columns = self.column_classes(Author)
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self.assertEqual(columns['name'][0], "CharField")
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self.assertEqual(columns['name'][1][3], 255)
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self.assertEqual(columns['name'][1][6], False)
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# Alter the name field to a TextField
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new_field = TextField(null=True)
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@ -197,7 +196,6 @@ class SchemaTests(TestCase):
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# Ensure the field is right to begin with
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columns = self.column_classes(Author)
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self.assertEqual(columns['name'][0], "CharField")
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self.assertEqual(columns['name'][1][3], 255)
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self.assertNotIn("display_name", columns)
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# Alter the name field's name
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new_field = CharField(max_length=254)
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@ -213,7 +211,6 @@ class SchemaTests(TestCase):
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# Ensure the field is right afterwards
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columns = self.column_classes(Author)
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self.assertEqual(columns['display_name'][0], "CharField")
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self.assertEqual(columns['display_name'][1][3], 254)
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self.assertNotIn("name", columns)
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def test_m2m(self):
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