1
我想以编程方式使用alembic(无需编写迁移)在我的数据库上执行一些DDL操作。执行没有中间承诺的alembic操作
import sqlalchemy
import alembic
context = alembic.migration.MigrationContext.configure(sqlalchemy.create_engine("postgres://user:@localhost/database"))
context.connection.echo = True
with alembic.op.Operations.context(context) as op:
op.rename_table("table", "old_table")
op.rename_table("new_table", "table")
基本上,我想在表中一次性换成new_table。但是,当我查看日志时,我看到alembic在第一个rename_table
声明之后提交。
2015-07-09 16:51:02,590 INFO sqlalchemy.engine.base.Engine ALTER TABLE table RENAME TO old_table
2015-07-09 16:51:02,590 INFO sqlalchemy.engine.base.Engine {}
2015-07-09 16:51:02,591 INFO sqlalchemy.engine.base.Engine COMMIT
2015-07-09 16:51:02,598 INFO sqlalchemy.engine.base.Engine ALTER TABLE new_table RENAME TO table
2015-07-09 16:51:02,598 INFO sqlalchemy.engine.base.Engine {}
2015-07-09 16:51:02,599 INFO sqlalchemy.engine.base.Engine COMMIT
如何告诉alembic只有在执行完这两个命令后才提交?