51 lines
2.1 KiB
Python
51 lines
2.1 KiB
Python
from django.db.backends.schema import BaseDatabaseSchemaEditor
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from django.db.models import NOT_PROVIDED
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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 NOT NULL"
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sql_alter_column_type = "MODIFY %(column)s %(type)s"
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sql_rename_column = "ALTER TABLE %(table)s CHANGE %(old_column)s %(new_column)s %(type)s"
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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)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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sql_create_pk = "ALTER TABLE %(table)s ADD CONSTRAINT %(name)s PRIMARY KEY (%(columns)s)"
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sql_delete_pk = "ALTER TABLE %(table)s DROP PRIMARY KEY"
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def quote_value(self, value):
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# Inner import to allow module to fail to load gracefully
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import MySQLdb.converters
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return MySQLdb.escape(value, MySQLdb.converters.conversions)
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def skip_default(self, field):
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"""
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MySQL doesn't accept default values for longtext and longblob
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and implicitly treats these columns as nullable.
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"""
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return field.db_type(self.connection) in {'longtext', 'longblob'}
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def add_field(self, model, field):
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super(DatabaseSchemaEditor, self).add_field(model, field)
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# Simulate the effect of a one-off default.
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if self.skip_default(field) and field.default not in {None, NOT_PROVIDED}:
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effective_default = self.effective_default(field)
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self.execute('UPDATE %(table)s SET %(column)s = %%s' % {
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'table': self.quote_name(model._meta.db_table),
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'column': self.quote_name(field.column),
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}, [effective_default])
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