Question

当我单击保存按钮时，只有all_university表更新，但all_colleges表尚未更新。如何在一个保存按钮上更新两个表？

<?php
  if(isset($_POST['save'])) {
    $chk = implode(",", $_POST['company_name']);  
    $sql = "update all_university set placement = '$chk' where university_name = '".$_POST['university_name']."'";
    $sql = "update all_colleges set placement = '$chk' where college_name = '".$_POST['college_name']."'";
    $value = mysqli_multi_query($link,$sql);
    if($value == true){
        $msg .="<h5 style='color:green'>Successfull</h5>";
    } else {
        $msg .="<h5 style='color:red'>Error!</h5>";
    }
  }
?>

Answer 1

您拥有多少查询并不重要。只要一个一个地运行它们此外，您应该使用准备好的陈述。

<?php
if(isset($_POST['save'])) {
    $chk = implode(",", $_POST['company_name']);  

    $sql = "update all_university set placement = ? where university_name = ?";
    $stmt = $link->prepare($sql);
    $stmt->bind_param("ss", $chk, $_POST['university_name']);
    $stmt->execute();

    $sql = "update all_colleges set placement = ? where college_name = ?";
    $stmt = $link->prepare($sql);
    $stmt->bind_param("ss", $chk, $_POST['college_name']);
    $stmt->execute();

    $msg .="<h5 style='color:green'>Successfull</h5>";
}

不要使用mysqli_multi_query（）。它对你没有好处，也不会像你想象的那样工作。

Answer 2

如果要使用多查询功能，则必须连接两个查询字符串：

$sql = "update all_university set placement = '$chk' where university_name = '".$_POST['university_name']."';";
$sql .= "update all_colleges set placement = '$chk' where college_name = '".$_POST['college_name']."'";

然后执行mysqli_multi_query。

或者，正如Rory已经提到的那样，只需使用普通的mysqli_query函数进行两次查询。

但你应该真正研究预备语句，因为你很容易受到 SQL注入的攻击！

Answer 3

Separate both query with semicolon (;)

$sql = "update all_university set placement = '$chk' where university_name = '".$_POST['university_name']."';";
$sql = "update all_colleges set placement = '$chk' where college_name = '".$_POST['college_name']."'";

Then, Append Both Query.

$sql = "update all_university set placement = '$chk' where university_name = '".$_POST['university_name']."'";
$sql .= "update all_colleges set placement = '$chk' where college_name = '".$_POST['college_name']."'";

执行它。

$value = mysqli_multi_query($link,$sql);

mysqli_multi_query()函数执行一个或多个查询数据库。查询用分号分隔。

如何在单个保存按钮上运行多个查询？

3 个答案: