如果第一条语句被成功执行，请运行第二条语句

Question

我有一个PHP脚本，用于将数据发送到我的数据库。如果SQL语句执行成功我想送一个UPDATE语句看起来像：

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

是否有可能运行一个第二份声明，如果成功地执行的第一条语句？如果是，那我该怎么做？

这里是我使用的数据发送到数据库的脚本：如果两个SQL语句执行成功，我想给用户发送到页面../success.php?id='.$id

编辑1

<?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'); 
} 
?> 

：

$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

可以。使用的$statement->execute();

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

^{返回值了解更多关于这在documentation。}

错误处理

除了上面的例子中，你可以检查错误代码。某些事情肯定会在某个时候出错，所以您将需要执行一些错误处理。检查错误代码并决定相应的操作。

一个小例子：

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

^{了解更多关于在documentation为好。}

Answer 2

$stml->execute()成功返回true。因此，U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 
     } 
    } 

或者干脆你可以做到这一点

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 
    }