037.PGSQL-事务 savepoint 保存点、rollback to 回滚

本文主要是介绍037.PGSQL-事务 savepoint 保存点、rollback to 回滚，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

事务

savepoint 保存点

rollback to 回滚

开启一个事务需要将SQL命令用BEGIN和COMMIT命令包围起来

BEGIN;
UPDATE accounts SET balance = balance - 100.00
    WHERE name = 'Alice';
SAVEPOINT my_savepoint;
UPDATE accounts SET balance = balance + 100.00
    WHERE name = 'Bob';
-- oops ... forget that and use Wally's account
ROLLBACK TO my_savepoint;
UPDATE accounts SET balance = balance + 100.00
    WHERE name = 'Wally';
COMMIT;

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