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)

    
    
    
    
    php
        require_once 'mysqltools.php';
        $mysql=new MySqlTools();
        $sql='select id,name from user';
        $users=$mysql->exec_dql($sql);    
    ?>
    php
        foreach($usersas$user){
        ?>
        

        

        
ID
        
Name
        
Oper
        
          

        
echo $user['id'];?>
        
echo $user['name'];?>
        

            $user['id'];?>">详情
            $user['id'];?>">删除
        
        
        
    
    

    
Add a new user
    

4:add.php　　（增加新用户）

    
    
    
    

    
    
Add
Index

    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 '
Add Success!
';        
        }else{
            echo '
Add Error!
';
        }
        }
    ?>
    

        Name:
        
    
    

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:$id
Name:$name
";
    echo '
Index
';
?>