我在php脚本中遇到问题.如果其中至少有一个失败,我想进行多次查询并能够全部回忆它们.您可以在下面找到我正在使用的脚本的简单示例:
$tags_input = array(6,4,5);
$conn = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8',
DB_USER, DB_PASSW, array(
PDO::ATTR_EMULATE_PREPARES => false,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'"));
$conn->beginTransaction();
$sql = "INSERT INTO projects (id, pr_id, enabled) VALUES ( :val0, :val1, :val2)";
$stmt = $conn->prepare($sql);
if(count($tags_input)>0){
for($i = 0;$i<count($tags_input);$i++){
$stmt->bindValue(':val0', 57);
$stmt->bindValue(':val1', $tags_input[$i]);
$stmt->bindValue(':val2', 'Y');
$result = $stmt->execute();
}
}
$res1 = $conn->commit();
$conn->rollBack();
现在,此示例生成错误:
Uncaught exception ‘PDOException’ with message ‘There is no active
transaction’
如果我删除行$conn-> rollBack();,则错误消失.因此我无法理解,为什么pdo对象看不到打开事务(begintransaction和commit不会产生任何错误).我也尝试将rollBack()放在事务中,但没有区别.我仍然收到错误’没有活动交易’.
我在InnoDB上运行PHP 5.6和Mysql表.
解决方法:
将您的事务代码包装在try-catch语句中.
//try {
$tags_input = array(6,4,5);
$conn = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8',
DB_USER, DB_PASSW, array(
PDO::ATTR_EMULATE_PREPARES => false,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'"));
} catch (Exception $e) {
die("Unable to connect: " . $e->getMessage());
}
try {
$conn->beginTransaction();
$sql = "INSERT INTO projects (id, pr_id, enabled) VALUES ( :val0, :val1, :val2)";
$stmt = $conn->prepare($sql);
if(count($tags_input)>0){
for($i = 0;$i<count($tags_input);$i++){
$stmt->bindValue(':val0', 57);
$stmt->bindValue(':val1', $tags_input[$i]);
$stmt->bindValue(':val2', 'Y');
$result = $stmt->execute();
}
}
$res1 = $conn->commit();
} catch (Exception $e) {
$conn->rollBack();
echo "Failed: " . $e->getMessage();
}
编辑
Richard作为评论提供了对答案的真正基础和直接的解释.
The reason you got error is because you were trying to close a transaction when it was already closed. beginTransaction opens one, and EITHER rollBack OR commit closes it. You have to avoid doing BOTH actions, meaning commit/rollback, for a single beginTransaction statement, or you’ll get an error. The above try/catch code ensures that only one closing statement is executed.
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