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MySQL database specific implementations of changeset classes.
"""
from sqlalchemy.databases import mysql as sa_base
from sqlalchemy import types as sqltypes
from rhodecode.lib.dbmigrate.migrate import exceptions
from rhodecode.lib.dbmigrate.migrate.changeset import ansisql
MySQLSchemaGenerator = sa_base.MySQLDDLCompiler
class MySQLColumnGenerator(MySQLSchemaGenerator, ansisql.ANSIColumnGenerator):
pass
class MySQLColumnDropper(ansisql.ANSIColumnDropper):
pass
class MySQLSchemaChanger(MySQLSchemaGenerator, ansisql.ANSISchemaChanger):
def visit_column(self, delta):
table = delta.table
colspec = self.get_column_specification(delta.result_column)
if delta.result_column.autoincrement:
primary_keys = [c for c in table.primary_key.columns
if (c.autoincrement and
isinstance(c.type, sqltypes.Integer) and
not c.foreign_keys)]
if primary_keys:
first = primary_keys.pop(0)
if first.name == delta.current_name:
colspec += " AUTO_INCREMENT"
old_col_name = self.preparer.quote(delta.current_name, table.quote)
self.start_alter_table(table)
self.append("CHANGE COLUMN %s " % old_col_name)
self.append(colspec)
self.execute()
def visit_index(self, param):
# If MySQL can do this, I can't find how
raise exceptions.NotSupportedError("MySQL cannot rename indexes")
class MySQLConstraintGenerator(ansisql.ANSIConstraintGenerator):
pass
class MySQLConstraintDropper(MySQLSchemaGenerator, ansisql.ANSIConstraintDropper):
def visit_migrate_check_constraint(self, *p, **k):
raise exceptions.NotSupportedError("MySQL does not support CHECK"
" constraints, use triggers instead.")
class MySQLDialect(ansisql.ANSIDialect):
columngenerator = MySQLColumnGenerator
columndropper = MySQLColumnDropper
schemachanger = MySQLSchemaChanger
constraintgenerator = MySQLConstraintGenerator
constraintdropper = MySQLConstraintDropper
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