我在处理事务时通常使用的思想是这样的(半伪代码):

try {
    // First of all, let's begin a transaction
    $db->beginTransaction();
    
    // A set of queries; if one fails, an exception should be thrown
    $db->query('first query');
    $db->query('second query');
    $db->query('third query');
    
    // If we arrive here, it means that no exception was thrown
    // i.e. no query has failed, and we can commit the transaction
    $db->commit();
} catch (\Throwable $e) {
    // An exception has been thrown
    // We must rollback the transaction
    $db->rollback();
    throw $e; // but the error must be handled anyway
}

Note that, with this idea, if a query fails, an Exception must be thrown:

PDO可以做到这一点，这取决于您如何配置它 看到PDO:: setAttribute 和PDO::ATTR_ERRMODE和PDO::ERRMODE_EXCEPTION 否则，使用一些其他API，您可能必须测试用于执行查询的函数的结果，并自己抛出异常。

Unfortunately, there is no magic involved. You cannot just put an instruction somewhere and have transactions done automatically: you still have to specific which group of queries must be executed in a transaction.

例如，您经常会在事务之前(开始之前)有几个查询，在事务之后(提交或回滚之后)有另外两个查询，您希望无论事务中发生了什么(或没有发生什么)，都能执行这些查询。

请检查您正在使用的存储引擎。如果是MyISAM，则不支持事务('COMMIT'，'ROLLBACK')，因为只有InnoDB存储引擎支持事务，MyISAM不支持事务。

另一个mysqli_multi_query的过程式示例，假设$query由分号分隔的语句填充。

mysqli_begin_transaction ($link);

for (mysqli_multi_query ($link, $query);
    mysqli_more_results ($link);
    mysqli_next_result ($link) );

! mysqli_errno ($link) ?
    mysqli_commit ($link) : mysqli_rollback ($link);

由于这是谷歌上的第一个结果“php mysql事务”，我想我应该添加一个答案，显式地演示如何使用mysqli(原作者想要的例子)。下面是一个PHP/mysqli事务的简化示例:

// let's pretend that a user wants to create a new "group". we will do so
// while at the same time creating a "membership" for the group which
// consists solely of the user themselves (at first). accordingly, the group
// and membership records should be created together, or not at all.
// this sounds like a job for: TRANSACTIONS! (*cue music*)

$group_name = "The Thursday Thumpers";
$member_name = "EleventyOne";
$conn = new mysqli($db_host,$db_user,$db_passwd,$db_name); // error-check this

// note: this is meant for InnoDB tables. won't work with MyISAM tables.

try {

    $conn->autocommit(FALSE); // i.e., start transaction

    // assume that the TABLE groups has an auto_increment id field
    $query = "INSERT INTO groups (name) ";
    $query .= "VALUES ('$group_name')";
    $result = $conn->query($query);
    if ( !$result ) {
        $result->free();
        throw new Exception($conn->error);
    }

    $group_id = $conn->insert_id; // last auto_inc id from *this* connection

    $query = "INSERT INTO group_membership (group_id,name) ";
    $query .= "VALUES ('$group_id','$member_name')";
    $result = $conn->query($query);
    if ( !$result ) {
        $result->free();
        throw new Exception($conn->error);
    }

    // our SQL queries have been successful. commit them
    // and go back to non-transaction mode.

    $conn->commit();
    $conn->autocommit(TRUE); // i.e., end transaction
}
catch ( Exception $e ) {

    // before rolling back the transaction, you'd want
    // to make sure that the exception was db-related
    $conn->rollback(); 
    $conn->autocommit(TRUE); // i.e., end transaction   
}

另外，请记住PHP 5.5有一个新方法mysqli::begin_transaction。但是，PHP团队还没有将其记录下来，我仍然停留在PHP 5.3中，所以我不能对此进行评论。

我在处理事务时通常使用的思想是这样的(半伪代码):

try {
    // First of all, let's begin a transaction
    $db->beginTransaction();
    
    // A set of queries; if one fails, an exception should be thrown
    $db->query('first query');
    $db->query('second query');
    $db->query('third query');
    
    // If we arrive here, it means that no exception was thrown
    // i.e. no query has failed, and we can commit the transaction
    $db->commit();
} catch (\Throwable $e) {
    // An exception has been thrown
    // We must rollback the transaction
    $db->rollback();
    throw $e; // but the error must be handled anyway
}

Note that, with this idea, if a query fails, an Exception must be thrown:

PDO可以做到这一点，这取决于您如何配置它 看到PDO:: setAttribute 和PDO::ATTR_ERRMODE和PDO::ERRMODE_EXCEPTION 否则，使用一些其他API，您可能必须测试用于执行查询的函数的结果，并自己抛出异常。

Unfortunately, there is no magic involved. You cannot just put an instruction somewhere and have transactions done automatically: you still have to specific which group of queries must be executed in a transaction.

例如，您经常会在事务之前(开始之前)有几个查询，在事务之后(提交或回滚之后)有另外两个查询，您希望无论事务中发生了什么(或没有发生什么)，都能执行这些查询。

我想我已经弄明白了，对吗?：

mysql_query("START TRANSACTION");

$a1 = mysql_query("INSERT INTO rarara (l_id) VALUES('1')");
$a2 = mysql_query("INSERT INTO rarara (l_id) VALUES('2')");

if ($a1 and $a2) {
    mysql_query("COMMIT");
} else {        
    mysql_query("ROLLBACK");
}