<?php$handler=mysql_connect("localhost","root","");mysql_select_db("task");mysql_query("SET AUTOCOMMIT=0");//设置为不自动提交，因为MYSQL默认立即执行mysql_query("BEGIN");//开始事务定义if(!mysql_query("insert into trans (id) values(‘2‘)")){mysql_query("ROOLBACK");//判断当执行失败时回滚}if(!mysql_query("insert into trans (id) values(‘4‘)")){mysql_query("ROOLBACK");//判断执行失败回滚}mysql_query("COMMIT");//执行事务mysql_close($handler);?>