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 SA
通过上面的实验可以发现,当参数completion_type设置为2时,COMMIT WORK后,我们再执行select @@version,会出现ERROR 2006(HY000):MySQL server has gone away的错误,这其实就是因为当前会话已经在上次执行COMMIT WORK语句后与服务器断开了连接。 ROLLBACK和ROLLBACK WORK与COMMIT和COMMIT WORK的工作一样,不再赘述。 SAV...
savepoint A; insertintoDEPTvalues(deptno_seq.nextval,v_number+1,''); savepoint B; insertintoDEPTvalues(deptno_seq.nextval,v_number+2,''); savepoint C; rollbacktoA; --如果这行不加,那么数据并没有写入到数据库中,只是写到了缓存中,直接查询数据库是没有插入的值的 commit; END; deptno_seq.next...
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,v_number,''); savepoint A; insertintoDEPTvalues(deptno_se...
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 ...
简介: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。 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。
ROLLBACK和ROLLBACK WORK与COMMIT和COMMIT WORK的工作一样,不再赘述。 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 ...
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;UPDATEaccountsSETbalance=balance+100.00WH...
some databases handle transactions differently than others. For example, PostgreSQL handles transactions differently than the other major databases such as Oracle or SQL Server. RazorSQL attempts to handle this by issuing SavePoints when using PostgreSQL in auto-commit off mode so that transactions do...
SQLRollbackTransaction[conn] terminates an SQL transaction. SQLRollbackTransaction[conn, savepoint] returns to an SQLSavepoint.