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前提:数据库表格之间没有任何关系 例子:添加一条数据到流水表 根据流水的账户id会锁定账户表主键id从而改变余额信息 像这样的操作一个要添加数据到表格,一个要修改数据,APIJSON的话一次请求不能完成的,这种的话怎么保证事物呢?