错误处理

Question

我有一个PHP脚本，我用它来将数据发送到我的数据库。如果成功执行了SQL语句，我想发送一个类似于：

的UPDATE语句

UPDATE accounts SET status='1' WHERE user_id='" . $_SESSION['user_id'] ."'

如果第一个语句成功执行，是否可以运行第二个语句？如果是，那我该怎么做？

以下是我用来将数据发送到数据库的脚本：

<?php
session_start(); 
if (isset($_GET['id'])) 

$correct = true;

$firstname = $_POST['firstname'] ;
$lastname = $_POST['lastname'] ;
$_SESSION['user_id'];
$status = $_POST['status'] ;

if($correct){
    $db = new PDO('mysql:host=localhost;dbname=db', 'root', '');

$query = "INSERT INTO users(firstname, lastname, user_id, status) VALUES (?, ?, ?, ?)";
$stmt = $db->prepare($query);
$stmt->execute(array($firstname, $lastname, $_SESSION['user_id'], $status));

$id = $db->lastInsertId();
            header('Location: ../success.php?id='.$id);
}else{
            header('Location: ../error.php');
}
?>

如果两个sql语句都成功执行，我想将用户发送到页面../success.php?id='.$id

修改1：

$query1 = "INSERT INTO users(firstname, lastname, user_id, status) VALUES (?, ?, ?, ?)" ;
$stmt = $db->prepare($query1);
$stmt->execute(array($firstname, $lastname, $_SESSION['user_id'], $status));


// the below code will execute if your insertion is successful
$query2 = "UPDATE accounts SET status='1' WHERE user_id='" . $_SESSION['user_id'] ."'" ;

// set the header location to go to another page


$id = $db->lastInsertId();
            header('Location: ../success.php?id='.$id);
}else{
            header('Location: ../error.php');
}

Answer 1

$stml->execute()成功时返回true。所以，你可以检查

   if($correct){
        $db = new PDO('mysql:host=localhost;dbname=db', 'root', '');

        $query = "INSERT INTO users(firstname, lastname, user_id, status) VALUES (?, ?, ?, ?)";
        $stmt = $db->prepare($query);
        $exec = $stmt->execute(array($firstname, $lastname, $_SESSION['user_id'], $status));

        if($exec){
            ....do update query
            // set the header location to go to another page
        }
    }

或者只是你可以这样做

   if($correct){
        $db = new PDO('mysql:host=localhost;dbname=db', 'root', '');

        $query = "INSERT INTO users(firstname, lastname, user_id, status) VALUES (?, ?, ?, ?)";
        $stmt = $db->prepare($query);
        $exec = $stmt->execute(array($firstname, $lastname, $_SESSION['user_id'], $status)) or die();

        // the below code will execute if your insertion is successful
        ....do update query
        // set the header location to go to another page
    }

Answer 2

你可以。使用$statement->execute();

的返回值

if ($statement->execute()) {
    // next statement
}

^{在documentation中了解更多相关信息。}

错误处理

除上述示例外，您还可以查看错误代码。某些事情在某个时刻肯定会出错，因此您需要执行一些错误处理。检查错误代码并确定相应的操作。

一个小例子：

if ($statement->errorCode() === "00000") {
    // everything went well!
} else {
    throw new Exception("Something went wrong!");
}

^{在documentation中了解更多相关内容。}

如果第一个语句成功执行，则运行第二个语句

2 个答案:

错误处理