1. 要程序里面支持事务，首先连接的数据库和数据表必须支持事务 mysql 为例：
数据库InnoDB支持 transactions
数据表支持事务：InnoDB 支持transaction
2. 框架thinkphp 支持事务代码
<span>public</span> <span>function</span><span> testrollback(){
</span><span>$model1</span> = D('item'<span>);
</span><span>$model2</span> = D('vote'<span>);
</span><span>$model1</span>-><span>startTrans();
</span><span>$res1</span> = <span>$model1</span>->where('id = 5')-><span>delete();
</span><span>$res2</span> = <span>$model2</span>->where('id = 2')-><span>delete();
dump(</span><span>$res1</span><span>);
dump(</span><span>$res2</span><span>);
</span><span>if</span>(<span>$res1</span> && <span>$res2</span><span>){
</span><span>$model1</span>->commit(); <span>//</span><span>只有$res1 和 $res2 都执行成功是才真正执行上面的数据库操作</span>
dump("commit"<span>);
}</span><span>else</span><span>{
</span><span>$model1</span>->rollback(); <span>//</span><span> 条件不满足，回滚</span>
dump("rollback"<span>);
}
dump(</span>"over"<span>);
</span><span>exit</span><span>;
}</span>
3. 原始PHP 代码事务实例
方法一：只支持数据库和数据表都是 innoDB 的情况
<span>public</span> <span>function</span><span> rollbackoriginal1(){
</span><span>$conn</span> = <span>mysql_connect</span>('127.0.0.1','summerzi','summerzi') or <span>die</span>('DB connection failed!'<span>);
</span><span>mysql_select_db</span>('summer',<span>$conn</span><span>);
</span><span>mysql_query</span>('set names "GBK"'<span>);
</span><span>mysql_query</span>('BEGIN'<span>);
</span><span>$sql1</span> = "INSERT INTO `summer_userdata`(`uid`,`type`,`target_id`) VALUES(41,1,233);"<span>;
</span><span>$sql2</span> = "INSERT INTO `summer_userdata`(`uid`,`type`,`target_id`) VALUES(fdfd,2,235);"<span>;
</span><span>$res1</span> = <span>mysql_query</span>(<span>$sql1</span><span>);
</span><span>$res2</span> = <span>mysql_query</span>(<span>$sql2</span><span>);
dump(</span><span>$sql1</span><span>);
dump(</span><span>$sql2</span><span>);
dump(</span><span>$res1</span><span>);
dump(</span><span>$res2</span><span>);
</span><span>if</span>(<span>$res1</span> && <span>$res2</span><span>){
</span><span>mysql_query</span>('COMMIT'<span>);
dump(</span>'commit success!'<span>);
}</span><span>else</span><span>{
</span><span>mysql_query</span>('ROLLBACK'<span>);
dump(</span>'commit failed, rollback!'<span>);
}
</span><span>mysql_query</span>('END'<span>);
}</span>方法二：（注意：对于不支持事务的MyISAM引擎数据库可以使用表锁定的方法）
<span>public</span> <span>function</span><span> rollbackoriginal2(){
</span><span>$conn</span> = <span>mysql_connect</span>('127.0.0.1','summerzi','summerzi') or <span>die</span>('DB connection failed!'<span>);
</span><span>mysql_select_db</span>('summer',<span>$conn</span><span>);
</span><span>mysql_query</span>('set names "GBK"'<span>);
</span><span>mysql_query</span>('SET AUTOCOMMIT=0');<span>//</span><span>//设置mysql不自动提交，需自行用commit语句提交</span>
<span>$sql1</span> = "INSERT INTO `summer_userdata`(`uid`,`type`,`target_id`) VALUES(41,1,233);"<span>;
</span><span>$sql2</span> = "INSERT INTO `summer_userdata`(`uid`,`type`,`target_id`) VALUES(44,2,235);"<span>;
</span><span>//</span><span>mysql_query("LOCK TABLES `hmbl_userdata` WRITE");//锁定表</span>
<span>$res1</span> = <span>mysql_query</span>(<span>$sql1</span><span>);
</span><span>$res2</span> = <span>mysql_query</span>(<span>$sql2</span><span>);
dump(</span><span>$sql1</span><span>);
dump(</span><span>$sql2</span><span>);
dump(</span><span>$res1</span><span>);
dump(</span><span>$res2</span><span>);
</span><span>//</span><span>mysql_query("UNLOCK TABLES");//解除锁定</span>
<span>if</span>(<span>$res1</span> && <span>$res2</span><span>){
</span><span>mysql_query</span>('COMMIT'<span>);
dump(</span>'commit success!'<span>);
}</span><span>else</span><span>{
</span><span>mysql_query</span>('ROLLBACK'<span>);
dump(</span>'commit failed, rollback!'<span>);
}
</span><span>mysql_query</span>("SET AUTOCOMMIT=1"<span>);
</span><span>mysql_query</span>('END'<span>);
}</span>php + mysql 对事务的处理比较简单，涉及到业务中多个数据操作，就可以考虑用事务处理
