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How to modify the database in php

藏色散人Original: 2020-12-02 09:12:244107browse

How to modify the database in php: first connect to the mysql database through the account and password; then modify the specified content of the database by executing the command "update users set..."; and finally judge the modification result.

The operating environment of this tutorial: Windows 7 system, PHP version 7.1, Dell G3 computer.

Recommended: "PHP Video Tutorial"

PHP Simple implementation of modifying data

index.php

<?php
$mysql_server_name=&#39;127.0.0.1&#39;; //改成自己的mysql数据库服务器
$mysql_username=&#39;root&#39;; //改成自己的mysql数据库用户名
$mysql_password=&#39;&#39;; //改成自己的mysql数据库密码
$mysql_database=&#39;chuan&#39;; //改成自己的mysql数据库名
$conn=mysqli_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database) or die("error connecting") ; //连接数据库
$sql ="select * from users ;"; //SQL语句
$result = mysqli_query($conn,$sql); //查询
?>
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>可编辑表格DEMO</title>
</head>
<body>
<div class="container">
    <table class="data" >
        <tr>
            <td>id</td>
            <td>name</td>
            <td >操作</td>
        </tr>
            <?php
                while($row = mysqli_fetch_array($result))
                {
                    echo "<tr>" ;
                    echo "<td>".$row[&#39;id&#39;]."</td>";
                    echo "<td>".$row[&#39;username&#39;]."</td>";
                    $id=$row[&#39;id&#39;];
                    echo "<td><a href=update.php?id=$id>修改</a></td>";
                    echo " </tr>";
                }
            ?>
    </table>
</div>
</body>
</html>
update.php
<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2018/6/17
 * Time: 17:54
 */
$id = $_GET[&#39;id&#39;];
$mysql_server_name=&#39;127.0.0.1&#39;; //改成自己的mysql数据库服务器
$mysql_username=&#39;root&#39;; //改成自己的mysql数据库用户名
$mysql_password=&#39;&#39;; //改成自己的mysql数据库密码
$mysql_database=&#39;chuan&#39;; //改成自己的mysql数据库名
$conn=mysqli_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database) or die("error connecting") ; //连接数据库
$sql ="select * from users where id= $id ;"; //SQL语句
$result = mysqli_query($conn,$sql); //查询
while($row = mysqli_fetch_array($result))
{
    $username=$row[&#39;username&#39;];
}
?>
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>可编辑表格DEMO</title>
</head>
<body>
<form method="post" action="doUpdate.php?id=<?php echo $id ?>">
username:<input type="text" name=&#39;username&#39; value=<?php echo  $username?>><br/>
<input type="submit">
</form>
</body>
</html>

doUpdate.php

<?php
$mysql_server_name=&#39;127.0.0.1&#39;; //改成自己的mysql数据库服务器
$mysql_username=&#39;root&#39;; //改成自己的mysql数据库用户名
$mysql_password=&#39;&#39;; //改成自己的mysql数据库密码
$mysql_database=&#39;chuan&#39;; //改成自己的mysql数据库名
$conn=mysqli_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database) or die("error connecting") ; //连接数据库
    $id = $_GET[&#39;id&#39;];
    $username = $_POST[&#39;username&#39;];
    $sql="update users set username= &#39;"."$username&#39; where id = $id";
    $result= mysqli_query($conn,$sql);
    if($result){
        exit("<script>
            alert(&#39;修改成功&#39;);
            location.href=&#39;index.php&#39;
        </script>");
    }else{
        exit("<script>
            alert(&#39;修改失败&#39;);
            location.href=&#39;index.php&#39;;
        </script>");
    }
?>

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