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How to add delete function in php

Nov 05, 2020 am 09:06 AM
php

php添加删除功能的实现方法:首先通过form表单创建一个登录的页面;然后在主页面上建立一个表格,让数据库的数据以表格的数据呈现;最后用a标签关联到删除页面即可。

How to add delete function in php

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php处理登录、添加数据、删除数据和修改数据

php 处理登录 :需要先建一个登录的页面,用form表单就可以很轻松的完成,(这里的示例是我根据数据库现成的表做的 是一个teacher表格 根据老师的工号和姓名登录的)

<form action="chuli.php" method="post">
  <div>
     工号: <input type="text" name="tno"/>
  </div>
    <div>
        姓名:<input type="text" name="tname"/>
    </div>
    <div><input type="submit" value="登录"/></div>
</form>
Copy after login

完成后跳转到处理页面

<?php
$tno=$_POST["tno"];
$tname=$_POST["tname"];
//连接数据库
$db=new mysqli("localhost","root","root","test");
//写查询代码
$sql="select tname from teacher where tno=&#39;{$tno}&#39;";
//执行代码 有返回集
$result=$db->query($sql);
$a=$result->fetch_row();
//判断姓名不能是空 
if(!empty($tname)&&$a[0]=$tname)
{
    header("location:main.php");
}
else
{
    echo"登录失败";
}
?>
Copy after login

即 连接数据库后 查找登录名和密码 然后根据所查找到的登录即可,登录成功后返回主页面就可以了。

php添加数据: 在主页面上面 我们建立一个表格 让数据库的数据以表格的数据呈现,

<table cellpadding="0" cellspacing="0" border="1" width="100%">
<tr>
    <td>工号</td>
    <td>姓名</td>
    <td>性别</td>
    <td>生日</td>
    <td>级别</td>
    <td>任课</td>
    <td>操作</td>
</tr>
    <?php
$db=new mysqli("localhost","root","root","test");
$sql="select * from teacher";
$result=$db->query($sql);
if($result)
{
    while($arr=$result->fetch_row())
    {
        $arr[2]?"男":"女";  //优化网页,如果输入1 就是返回男  如果输入0  返回的就是女
        echo"<tr>
    <td>{$arr[0]}</td>
    <td>{$arr[1]}</td>
    <td>{$arr[2]}</td>
    <td>{$arr[3]}</td>
    <td>{$arr[4]}</td>
    <td>{$arr[5]}</td>
    <td><a onclick=\\"return confirm(&#39;确定要删除吗&#39;)\\"  href=&#39;shanchu.php?tno={$arr[0]}&#39;>删除</a></td>
</tr>";
    }
}
?>
</table>
Copy after login

在表格下面用添加数据

添加数据

标签,然后点击添加数据跳转到添加数据的页面, 和登录页面是一样的 都是采用的form表单,很简单的把需要的呈现出来

php删除数据: 在主页面的表格中添加一列,(已经在上面的代码中展现出来了) 用删除标签关联到删除页面,删除页面同样采用form表单

php修改数据:相比以上的处理要麻烦一些,是建立在添加数据和删除数据的基础上的,其他的和删除数据的方法是差不多的,修改数据的时候点开表格的时候

要有默认的数据 这时应该这么操作:

<form action="update.php" method="post">
//刚好学习了封装数据库,就当做练习了,数据库为DBDA.php
    <?php
    $id=$_GET["id"];
    include("DBDA.php");
    $db=new DBDA();
    $sql="select * from house WHERE id={$id}";
    $arr=$db->Query($sql);
    foreach($arr as $v) //因为是查询语句,所以需要遍历一下数组
    {
    }
    ?>
    关键字:<input type="text" name="keyword" value="<?php echo $v[1] ?>"/><br/> //这里的value值是为了让修改的表中有默认的值
    面积:<input type="text" name="meter" value="<?php echo $v[3] ?>"/><br/>
    租金:<input type="text" name="rent" value="<?php echo $v[4] ?>"/><br/>
    租赁方式:<input type="text" name="renttype" value="<?php echo $v[5] ?>"/><br/>
    <input type="submit" value="修改"/>
</form>
Copy after login

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