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PHP 之Mysql增删改查操作案例

1：user表：

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(32) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8

2：mysqltools.php　　(mysql工具类)

<?php
    class MySqlTools{
    private $host='127.0.0.1';
    private $uname='root';
    private $pwd='mysql';
    private $dbname='test';
    
    private $conn;
    
    function __construct(){
        $this->conn=mysql_connect($this->host,$this->uname,$this->pwd)
        or die('mysql_connect error:'.mysql_error());
        mysql_select_db($this->dbname)
        or die('mysql_select_db error:'.mysql_error());
        mysql_query("set names 'utf8'");    
    }    

    function exec_dql($sql){
        $result=mysql_query($sql,$this->conn);
        $arr=array();
        while($row=mysql_fetch_assoc($result)){
        $arr[]=$row;
        }
        mysql_free_result($result);
        return $arr;
    }

    function exec_dml($sql){
        return mysql_query($sql,$this->conn);    
    }

    function free(){
        mysql_close($this->conn);    
    }
    }
?>

3:index.php　　(首页)

<html>
    <head>
    <title>Index</title>
    </head>
    <body>
    <?php
        require_once 'mysqltools.php';
        $mysql=new MySqlTools();
        $sql='select id,name from user';
        $users=$mysql->exec_dql($sql);    
    ?>
    <table style="50%;">
        <tr>
        <th>ID</th>
        <th>Name</th>
        <th>Oper</th>
        </tr>
        <?php
        foreach($users as $user){
        ?>
        <tr align="center">
        <td><?php echo $user['id'];?></td>
        <td><?php echo $user['name'];?></td>
        <td>
            <a href="show.php?id=<?php echo $user['id'];?>">详情</a>
            <a href="delete.php?id=<?php echo $user['id'];?>">删除</a>
        </td>
        </tr>
        <?php }?>
    </table>
    <hr/>
    <h2><a href="add.php">Add a new user</a></h2>
    </body>
</html>

4:add.php　　（增加新用户）

<html>
    <head>
    <title>Add</title>
    <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
    </head>

    <body>
    <h1>Add</h1><a href="index.php">Index</a><br/>
    <?php
        if(!empty($_POST['uname'])){
        $name=$_POST['uname'];
        require_once 'mysqltools.php';
        $sql="insert into user(name) values('$name')";    
        $mysql=new MySqlTools();
        if($mysql->exec_dml($sql)){
            echo '<h3>Add Success!</h3>';        
        }else{
            echo '<h3>Add Error!</h3>';
        }
        }
    ?>
    <form method="post">
        Name:<input type="text" name="uname"/>
        <input type="submit" value="Add"/>
    </form>
    </body>
</html>

5:delete.php　　(删除操作)

<?php
    $id=$_GET['id'];

    if(isset($id)){
    require_once 'mysqltools.php';
    $mysql=new MySqlTools();
    
    $sql="delete from user where id=$id";
    $mysql->exec_dml($sql);
    }

    header('Location: index.php');
?>

6：show.php　　(显示详细信息页面)

<?php
    header('Conent-Type:text/html;charset=utf-8');

    $id=$_GET['id'];
    $name='';
    if(isset($id)){
    require_once 'mysqltools.php';
    $mysql=new MySqlTools();
    $sql="select name from user where id=$id limit 1";
    $arr=$mysql->exec_dql($sql);    
    $name=$arr[0]['name'];
    }

    echo "ID:$id<br/>Name:$name<br/>";
    echo '<h3><a href="index.php">Index</a></h3>';
?>

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原文地址：https://www.cnblogs.com/yshyee/p/3372650.html