在上面的例子中可以看到,虽然我们在发生重复错误后,通过ROLLBACK TO SAVEPOINT t2命令回滚到了保存点t2,但是事务此时并没有结束,我们再接着运行ROLLBACK后,事务才完整回滚。需要再次提醒的是,ROLLBACK TO SAVEPOINT命令并不真正地结束事务。 回到顶部 隐式提交的SQL语句 以下这些SQL语句会产生一个隐式的提交操作,即执
savepoint A(这个A是savepoint的名字) --跳转到savepoint A处 rollbacktoA 一旦执行了rollback那么savepoint的操作都将撤消,当然最后一定执行一次commit,否则所有的操作都是在缓存中进行的,不会真正的写入数据库中,写个例子 DECLARE v_number number; BEGIN v_number := 1; insertintoDEPTvalues(deptno_seq.nextval,...
--起一个名字为A的savepoion savepoint A(这个A是savepoint的名字) --跳转到savepoint A处 rollbacktoA 一旦执行了rollback那么savepoint的操作都将撤消,当然最后一定执行一次commit,否则所有的操作都是在缓存中进行的,不会真正的写入数据库中,写个例子 DECLARE v_number number; BEGIN v_number := 1; insertint...
We can run multiple SQL statements in a single transaction by grouping them within the pair of statements START TRANSACTION and COMMIT or ROLLBACK. However, we can’t nest transactions. COMMIT, ROLLBACK, and SAVEPOINT are SQL transaction management statements in MySQL. However,only the transactiona...
事务控制语句 ,begin,rollback,savepoint,隐式提交的 SQL语句 事务控制语句 在MySQL命令⾏的默认设置下，事务都是⾃动提交的，即执⾏SQL语句后就会马上执⾏COMMIT操作。因此开始⼀个事务，必须使⽤ BEGIN、START TRANSACTION，或者执⾏SET AUTOCOMMIT=0，以禁⽤当前会话的⾃动提交。这和Microsoft SQL ...
Write a SQL query to create a savepoint after inserting data into a table and rollback to that savepoint if an error occurs later in the transaction. Write a SQL query to use savepoints to undo specific steps in a multi-step transaction without affecting the entire operation. ...
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;UPDATEaccountsSETbalance=balance-100.00WHEREname='Alice'; SAVEPOINT my_savepoint;UPDATEaccountsSETbalance=balance+100.00WHEREname='Bob';--oops ... forget that and use Wally's accountROLLBACKTOmy_savepoint;UPDATEaccountsSETbalan...
SAVEPOINT记录了一个保存点,可以通过ROLLBACK TO SAVEPOINT回滚到某个保存点,但是如果回滚到一个不存在的保存点,会抛出异常: begin; rollback to savepoint t1; ERROR 1305(42000):SAVEPOINT t1 does not exist InnoDB存储引擎中的事务都是原子的,这说明下述两种情况:或者构成事务的每条语句都会提交(成为永久),或者...
Learn about the PL SQL Transactions with examples of COMMIT, ROLLBACK, SAVEPOINT, AUTOCOMMIT and LOCK Table statements.
2. ROLLBACK [WORK] TO [SAVEPOINT] identifier 3. RELEASE SAVEPOINT identifier 1. 2. 3. InnoDB 支持 SQL 语句 SAVEPOINT、ROLLBACK TO SAVEPOINT、RELEASE SAVEPOINT 和用于 ROLLBACK 的可选 WORK 关键字。 SAVEPOINT 语句设置一个名为 identifier 的事务保存点。如果当前事务具有同名的保存点,则删除旧的保存...