学习笔记-----php搭建用户管理系统

Posted 2020-10-10 自行脑补

后台：php,数据库：mysql,前端：html,css,js;

主要页面介绍：

1.php连接数据库后台，读取数据并将其以表格的形式显示，并且有添加，编辑，删除，分页等功能；

2.php用于添加用户的表单页面，1.php中的添加用户按钮跳转到这里；

3-add.php用于接收2.php POST过来的表单数据，加以简单sql语言添加用户操作；

4-del.php用于sql删除数据操作；

5-edit.php类似2.php,用于编辑用户信息；

6-save.php用于接收5-edit.php POST过来的表单数据，加以简单sql语言编辑用户信息；

page.php用于处理分页功能；

FIRST(主要1.php页面)

首先每个php页面为了中文显示不乱码使用代码

header(‘Content-type:text/html;charset=utf-8‘);

mysql数据库设计细节

id设置为主键，并且设置为自动递增，birth设置为日期date

pdo连接数据库,获取所有数据

$dsn = ‘mysql:dbname=user_messages;host=localhost‘;
$user = ‘root‘;
$password = ‘root‘;

try{
    $pdo = new PDO($dsn,$user,$password);
}catch(PDOException $e){
    echo ‘出错了，错误信息为‘,$e->getMessage();  
}

$sql = "SET NAMES UTF8";
$pdo -> exec($sql);

$sql = "SELECT * FROM `users`";
$res = $pdo -> query($sql);
$data = $res ->fetchAll(PDO::FETCH_ASSOC); //获取的所有数据数组

使用foreach遍历显示数据

<?php foreach ($data as $key => $value):?>
<tr>
    <td><?php echo $value[‘id‘] ?></td>
    <td><?php echo $value[‘name‘] ?></td>
    <td><?php echo $value[‘age‘] ?></td>
    <td><?php echo $value[‘sex‘] == 1 ? ‘男‘ : ‘女‘ ?></td>
    <td><?php echo $value[‘birth‘] ?></td>
    <td><?php echo $value[‘phone‘] ?></td>
    <td><?php echo $value[‘vita‘] ?></td>
</tr>
<?php endforeach ?>

SECOND（添加用户3-add.php页面）

先判断2.php页面有没有POST数据过来

if(!empty($_POST)){
   $insert_data = $_POST; //获取2.php传过来的数据  
}

提取$insert_data数组中的字段来填充成sql语言进行操作

$keys = array_keys($insert_data); //获取数据的key
$filed = ‘(`‘ .implode(‘`,`‘,keys). ‘`)‘;
$values = "‘".implode("‘,‘",$insert_data)."‘";
$sql = ‘INSERT INTO `users` .$filed.‘VALUES(‘.$values.‘);‘;

$affect_row = $pdo -> exec($sql);

if($affect_row>0){
    echo ‘<script>alert("添加成功");location="1.php"</script>‘;
}else{
    echo ‘<script>alert("添加失败");history.back();</script>‘;
}

THIRD(删除操作4-del.php)

删除操作主要获取该数据的id,使用$_GET获取

在1.php页面设置一个删除按钮，并将id设置在href里面、

<a name="detel" href="4-del.php?id=<?php echo $value[‘id‘]?">删除></a>

然后先判断能不能GET得到id

    if(isset($_GET[‘id‘])){
        $id = $_GET[‘id‘]+0; //为了防止用人直接在地址栏输入非数字来访问破坏数据库，强行转换为数字

        $dsn = ‘mysql:dbname=user_messages;host=localhost‘;
        $user = ‘root‘;
        $password = ‘root‘;

        try{
            $pdo = new PDO($dsn,$user,$password);
        }catch(PDOException $e){
            echo "出错了:". $e->getMessage();
        }

        $sql = "SET NAMES UTF8";
        $T = $pdo ->exec($sql);

        $sql = "DELETE FROM `users` WHERE `id` = $id";
        $affect_row = $pdo->exec($sql);
        if($affect_row>0){
            echo ‘<script>alert("删除成功");location="1.php"</script>‘;
        }else{
            echo ‘<script>alert("删除失败");history.back();</script>‘;
        }
    }    

FOUTH（编辑操作5-edit.php和6-save.php）

在1.php页面设置一个编辑按钮，并将id设置在href里面

<a href="5-edit.php?id=<?php echo $value[‘id‘] ?>">编辑</a> 

获取该id所对应的数据，将其预显示在5-edit.php的表单input里面

    if(isset($_GET[‘id‘])){
        $id = $_GET[‘id‘]+0;
        $dsn = ‘mysql:dbname=user_messages;host=localhost‘;
        $user = ‘root‘;
        $password = ‘root‘;

        try{
            $pdo = new PDO($dsn,$user,$password);
        }catch(PDOException $e){
            echo "出错了:". $e->getMessage();
        }

        $sql = "SET NAMES UTF8";
        $T = $pdo ->exec($sql);

        $sql = "SELECT `id`,`name`,`age`,`sex`,`phone`,`birth`,`person` FROM `users` WHERE `id` = $id";
        $res = $pdo->query($sql);
        $one_user = $res->fetch(PDO::FETCH_ASSOC); 
    }

6-save.php用于处理5-edit.php POST过来的新数据

    if (!empty($_POST))
    {
        $dsn = ‘mysql:dbname=user_messages;host=localhost‘;
        $user = ‘root‘;
        $password = ‘root‘;
        // 连接数据库
        try {
            $pdo = new PDO($dsn , $user , $password);
        } catch (PDOException $e) {
            // print_r($e);
            echo ‘出错啦。错误信息是‘, $e->getMessage() , ‘<br> 看不懂就联系网站管理员‘;
            // echo ‘网站升级中‘;
        }
        
        // 设置编码
        $sql = "SET NAMES UTF8";
        $pdo -> exec ( $sql );

        $where = $_POST[‘id‘];
        unset($_POST[‘id‘]);
        $save_data = $_POST;

        $sql = "UPDATE `users` SET";
        foreach ($save_data as $key => $value) {
            $sql.="`".$key."`=‘".$value."‘,";
        }
        $sql = rtrim($sql,‘,‘);
        $sql.=" WHERE `id`=$where";
        $affect_rows = $pdo ->exec($sql);
        if ($affect_rows > 0)
        {
            echo ‘<script>alert("修改成功");location="1.php"</script>‘;
        }
        else
        {
            echo ‘<script>alert("修改失败");history.back();</script>‘;
        }
    }

分页功能

 在1-php中设置好参数，并调用一个写好的函数

// 分页
    $current = isset($_GET[‘page‘])?abs($_GET[‘page‘]):1;
    $current = $current>0?$current:1;
    $limit = 5;
    $offect = $limit * ($current-1);

    $sql = "SELECT COUNT(*) FROM `users`";
    $res = $pdo->query($sql);
    $count = $res->fetch(PDO::FETCH_NUM);
    $count = $count[0];

    $size = 5;

    $sql = "SELECT * FROM `users` LIMIT $offect,$limit";

//调用函数
<?php page($current,$limit,$count,$size);?>

函数

function page($current,$limit,$count,$size){
    $count_page = ceil($count/$limit);
    if($current>1){
        echo ‘<a href="?page=1">首页</a>‘;
        echo ‘<a href="?page=‘.($current-1).‘">上一页</a>‘;
    }else{
        echo‘<span>首页</span>‘;
        echo‘<span>上一页</span>‘;
    }

    if($current<$size/2+1){
        $star = 1;
        $end = $count_page>=$size?$size:$count_page;
    }elseif($current>($count_page-($size/2)+1)){
        $star =($count_page-$size+1)>=1?($count_page-$size + 1):1;
        $end = $count_page;
    }else{
        $star = $current - floor($size/2);
        $end = $current + floor($size/2);
    }

    for($i = $star;$i<=$end;$i++){
        if ($i == $current) {
            echo ‘ <span>‘.$i.‘</span> ‘;
        }else{
            echo ‘ <a href="?page=‘.$i.‘">‘.$i.‘</a> ‘;
        }
    }

    if($current<$count_page){
        echo ‘<a href="?page=‘.($current+1).‘">下一页</a>‘;
        echo ‘<a href="?page=‘.$count_page.‘">尾页</a>‘;
    }else{
        echo‘<span>下一页</span>‘;
        echo‘<span>尾页</span>‘;
    }
}