Question

我正在PDO中学习和学习新知识。在PDO中使用数组会给我带来困难。我正在使用PDO语法开发简单的Web应用程序。一切都很顺利，但我无法从单个提交按钮更新多个值。

HTML表格

    <td>
        <input type="number" name="roll[]" value="<?php echo $roll?>">
    </td>
    <td>
        <input type="text" name="name[]" value="<?php echo $name?>">
    <td>

我可以打印数据。

if(isset($_POST['submit'])){
        $name = $_POST['name'];
        $roll = $_POST['roll'];
        foreach( $roll as $key => $n ){
            print "The name is ".$name[$key]." and email is ".$roll[$key].", thank you\n";
        }
    }

但我无法一次更新多个值。也许是因为在PDO中组合数组方面缺乏知识。我在互联网上搜索过。但我发现只有先进的问题和答案。我在这个问题上找不到任何示例或讨论主题。我确信我100％错了，所以下面的代码不起作用。请帮助如何使用数组

进行更新

PHP代码

if(isset($_POST['submit'])){
    $name = $_POST['name'];
    $roll = $_POST['roll'];

    foreach( $roll as $key => $n ){
        $sql = "UPDATE student SET name=:name WHERE roll=:roll";
        $query = $con->prepare($sql);
        $query->bindparam(':roll', $roll[$key]);
        $query->bindparam(':name', $name[$key]);
        $query->execute();
    }
}

Answer 1

如何在循环外准备语句，然后在循环中绑定值并执行。

<?php


if(isset($_POST['submit'])){
    $name = $_POST['name'];
    $roll = $_POST['roll'];


     $sql = "UPDATE student SET name=:name WHERE roll=:roll";
     $query = $con->prepare($sql);

    foreach($roll as $key => $n){
        $query->bindParam(':roll', $n[$key]);
        $query->bindParam(':name', $name[$key]);
        $query->execute();
    }
}

Answer 2

对于此操作使用for循环，因为不涉及关联数组

if(isset($_POST['submit'])){

$name = array();// initialize it first for a good coding standard
$roll = array();// initialize it first for a good coding standard
$name = $_POST['name'];
$roll = $_POST['roll'];

for($i=0;$i<count($name);$i++){ // considering the array elements of roll are equal to name elements 
    $sql = "UPDATE student SET name=:name WHERE roll=:roll";
    $query = $con->prepare($sql);
    $query->bindparam(':roll', $name[$i]);
    $query->bindparam(':name', $roll[$i]);
    $query->execute();
}
}

使用数组的PDO更新表

2 个答案: