if($MysqLi->connect_errno) {
die('数据库连接失败'.$MysqLi->connect_error);
}

$MysqLi->autocommit(false); //自动提交模式设为false
$flag = true; //事务是否成功执行的标志

$query = "update account set balance=balance-1000 where id=3";
$result = $MysqLi->query($query);
$affected_count = $MysqLi->affected_rows;
if(!result || $affected_count == 0) { //失败
$flag = false;
}

$query = "update account set balance=balance+1000 where id=2";
$result = $MysqLi->query($query);
$affected_count = $MysqLi->affected_rows;
if(!$result || $affected_count == 0) {
$flag = false;
}

if($flag) {
$MysqLi->commit();
echo '转账成功';
} else {
$MysqLi->rollback();
echo '转账失败';
}

$MysqLi->autocommit(true); //重新设置事务为自动提交
$MysqLi->close();
?>

try{
$age=10;
$pdo->beginTransaction();//开始事务
$affected_rows1=$pdo->exec("update kfry set k_age=k_age+{$age} where k_name='user1'");
$affected_rows2=$pdo->exec("update kfry set k_age=k_age-{$age} where k_name='user2'");//随意更改使之执行成功或失败
/ if($affected_rows1&&$affected_rows2)
{
$pdo->commit();
echo "操作成功";
}else{
$pdo->rollback();
} /
if(!$affected_rows1)
throw new PDOException("加入错误");
if(!$affected_rows2)
throw new PDOException("减少错误");
echo "操作成功";
$pdo->commit();//如果执行到此处前面两个更新sql语句执行成功，整个事务执行成功
}catch(PDOException $e){
echo "操作失败：".$e->getMessage();
$pdo->rollback();//执行事务中的语句出了问题，整个事务全部撤销
}
$pdo->setAttribute(PDO::ATTR_AUTOCOMMIT,1);
//测试是否成功
echo "\n操作结果为:\n";
$sql="select * from kfry";
$result=$pdo->query($sql);
foreach($result as $v)
{
echo $v['k_name']." ".$v['k_age']."\n";
}
?>