peeweedbevolve.py 文件源码

def drop_foreign_key(db, migrator, table_name, fk_name):
  drop_stmt = 'drop foreign key' if is_mysql(db) else 'DROP CONSTRAINT'
  op = pw.Clause(pw.SQL('ALTER TABLE'), pw.Entity(table_name), pw.SQL(drop_stmt), pw.Entity(fk_name))
  return normalize_whatever_junk_peewee_migrations_gives_you(db, migrator, op)