并且在执行的过程中, 如果其中的某条执行失败, 可以回滚所有已更改的操作. 如果执行成功, 那么这一系列操作都会永久有效. 事务很好的解决了在操作数据库的时候不同步的问题. 同时, 通过事务去执行大数据量的时候, 执行效率可以提高很多很多.
在 PDO 中, 事务已经显得非常简单. 下面一个基本的例子, 演示了向 SQLite 数据库插入 1000000 条数据, 并且在出错的时候回滚.
复制代码 代码如下:
try
{
$conn = new PDO('sqlite:Transactioion.s3db');
$conn->beginTransaction();
for($i=0; $i{
$conn->exec("insert into [users] values(null,'username')");
}
$conn->commit();
}
catch(PDOException $ex)
{
$conn->rollBack();
}

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