我使用PHP PDO事务。我有insert和update语句，我想在rowCount（）返回0时回滚事务。请参阅下面的示例代码。
<?php
$pdo = new PDO('mysql:host=localhost;dbname=test', 'root', '', array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_EMULATE_PREPARES => false
));
$userIds = [1,2,""];
$paymentAmounts = [10.50,20.50,30.50];
$error = array();
$pdo->beginTransaction();
try
{
foreach($userIds as $key => $userId )
{
$sql = "INSERT INTO payments (user_id, amount) VALUES (?, ?)";
$stmt = $pdo->prepare($sql);
$stmt->execute(array(
$userId,
$paymentAmounts[$key]
)
);
if($stmt->rowCount() <= 0)
{
$error[] = ["Error occurred in userId: ".$userId];
}
$sql = "UPDATE users SET credit = ? WHERE id = ?";
$stmt = $pdo->prepare($sql);
$stmt->execute(array(
$paymentAmounts[$key],
$userId
)
);
if($stmt->rowCount() <= 0)
{
$error[] = ["Error occurred in userId: ".$userId];
}
}
if(!empty($error))
{
$displayError = implode(",", $error);
throw new Exception($displayError);
}
// It should not reach here, if there is an error.
$pdo->commit();
}
catch(Exception $e){
echo $e->getMessage(); // displayError
$pdo->rollBack(); // <<<==== It should rollback both Insert and Update to original state
}
?>
我有$ userIds数组。对于userId 1和2，rowCount（）将为Insert和Update返回1。但是对于空userId，rowCount（）将返回0.如果rowCount（）为0，我将错误消息分配给$ error []。如果$ error不为空，它将捕获Exception并回滚所有$ userIds的事务。
我的预期结果是当$ error不为空时，将在catch中抛出异常和回滚。它应该假设删除userIds（1,2）的表付款中的记录，并在表用户中更新userIds（1,2）的原始信用值。
我得到的结果是当代码到达$ pdo-＆gt; rollBack（）时，它只从支付表中删除插入的记录，并且它没有将原始信用值更新回用户表中的userIds（1 ，2）。
您能否就代码的问题提出建议？ 谢谢。
==========查询创建表和插入语句==========
-- CREATE TABLE "payments" -------------------------------
CREATE TABLE `payments` (
`id` BigInt( 11 ) UNSIGNED AUTO_INCREMENT NOT NULL,
`user_id` BigInt( 11 ) UNSIGNED NOT NULL,
`amount` VarChar( 20 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
PRIMARY KEY ( `id` ) )
CHARACTER SET = latin1
COLLATE = latin1_swedish_ci
ENGINE = InnoDB
AUTO_INCREMENT = 1;
-- -------------------------------------------------------------
-- CREATE TABLE "users" -------------------------------
CREATE TABLE `users` (
`id` BigInt( 11 ) UNSIGNED AUTO_INCREMENT NOT NULL,
`credit` VarChar( 20 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
PRIMARY KEY ( `id` ) )
CHARACTER SET = latin1
COLLATE = latin1_swedish_ci
ENGINE = InnoDB
AUTO_INCREMENT = 1;
-- -------------------------------------------------------------
INSERT INTO `users` ( `credit`, `id`)
VALUES ( '5', 1 ),( '10', 2 ),( '15', 3 );
答案 0 :(得分：2)
$dbport = 3306;
$dbhost = 'localhost';
$dbuser = 'root';
$dbpwd = 'xxx';
$dbname = 'xxx';
$options=array(
PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL,
PDO::ATTR_PERSISTENT => FALSE,
PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES \'utf8mb4\' COLLATE \'utf8mb4_unicode_ci\', @@sql_mode = STRICT_ALL_TABLES, @@foreign_key_checks = 1'
);
$dsn='mysql:host='.$dbhost.';port='.$dbport.';dbname='.$dbname;
$dbo=new PDO( $dsn, $dbuser, $dbpwd, $options );
$userIds = array(1,2,3,4,5,6);
$paymentAmounts = array( 25,30,55,30,45,44 );
try {
$dbo->beginTransaction();
if( count( $userIds )!=count( $paymentAmounts ) ) throw new Exception( sprintf('Unbalanced source arrays: $userids:%d, $paymentAmounts:%d',count( $userIds ),count( $paymentAmounts )));
foreach( $userIds as $key => $userId ){
$sql = "insert into payments ( user_id, amount ) values ( ?, ? )";
$stmt = $dbo->prepare( $sql );
if( $stmt ){
$stmt->execute( array( $userId, $paymentAmounts[ $key ] ) );
if( $stmt->rowCount() <= 0 ) throw new Exception( sprintf('Query #1 -> Error occurred in userId: %d count: %d', $userId, $stmt->rowCount() ) );
} else {
throw new Exception( sprintf('Query #1 Prepare method failed @ %d for %d', $paymentAmounts[ $key ], $userId ) );
}
$sql = "update users set credit = credit + ? where id = ?";
$stmt = $dbo->prepare( $sql );
if( $stmt ) {
$stmt->execute( array( $paymentAmounts[ $key ], $userId ) );
if( $stmt->rowCount() <= 0 ) throw new Exception( sprintf('Query #2 -> Error occurred in userId: %d count: %d', $userId, $stmt->rowCount() ) );
} else {
throw new Exception( sprintf('Query #2 Prepare method failed @ %d for %d', $paymentAmounts[ $key ], $userId ) );
}
}
$dbo->commit();
}catch( Exception $e ){
echo 'Exception Raised: '.$e->getMessage();
$dbo->rollBack();
}
在测试1之前
mysql> select * from payments;
Empty set (0.00 sec)
mysql> select * from users;
+------+--------+
| id | credit |
+------+--------+
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
+------+--------+
6 rows in set (0.00 sec)
在测试＃1之后
mysql> select * from payments;
+----+---------+--------+
| id | user_id | amount |
+----+---------+--------+
| 1 | 1 | 25 |
| 2 | 2 | 30 |
| 3 | 3 | 55 |
| 4 | 4 | 30 |
| 5 | 5 | 45 |
| 6 | 6 | 44 |
+----+---------+--------+
6 rows in set (0.00 sec)
mysql> select * from users;
+------+--------+
| id | credit |
+------+--------+
| 1 | 25 |
| 2 | 30 |
| 3 | 55 |
| 4 | 30 |
| 5 | 45 |
| 6 | 44 |
+------+--------+
7 rows in set (0.00 sec)
测试＃2〜故意导致异常 - 使用此数据不匹配的数组长度：
$userIds = array(1,2,3,4,5,6);
$paymentAmounts = array( 25,30,55,30,45,44,21 );/* <----- extra item to cause exception */
这会导致异常：
Exception Raised: Unbalanced source arrays: $userids:6, $paymentAmounts:7
mysql> select * from users;
+----+--------+
| id | credit |
+----+--------+
| 1 | 25 |
| 2 | 30 |
| 3 | 55 |
| 4 | 30 |
| 5 | 45 |
| 6 | 44 |
+----+--------+
6 rows in set (0.00 sec)
与以前相同的数据 - 查询在异常后没有提交到db。
测试＃3 - 带有假列名的软件查询
$sql = "update users set credit = boomerang + ? where id = ?";/* <----- ficticious column cause exception */
这会导致异常
Exception Raised: Query #2 -> Error occurred in userId: 1 count: 0
mysql> select * from users;
+----+--------+
| id | credit |
+----+--------+
| 1 | 25 |
| 2 | 30 |
| 3 | 55 |
| 4 | 30 |
| 5 | 45 |
| 6 | 44 |
+----+--------+
6 rows in set (0.00 sec)
同样，快速检查显示数据没有变化，因此看起来整个过程正常运作