php开发_留言板的CRUD(增，删，改，查)操作

Posted 2020-06-28

项目结构：

添加页面：                                说明：这里只注重操作，对界面的美工没有下工夫，希望大家理解......

列表页面：

修改页面：

项目中所需的sql：

 1 create database form;
 2 
 3 use form;
 4 
 5 CREATE TABLE `message` (
 6   `id` tinyint(1) NOT NULL auto_increment,
 7   `user` varchar(25) NOT NULL,
 8   `title` varchar(50) NOT NULL,
 9   `content` tinytext NOT NULL,
10   `lastdate` date NOT NULL,
11   PRIMARY KEY  (`id`)
12 ) ENGINE=InnoDB DEFAULT CHARSET=gbk AUTO_INCREMENT=1 ;

conn.php

1 <?php
2 $conn = @ mysql_connect("localhost", "root", "") or die("数据库链接错误");
3 mysql_select_db("form", $conn);
4 mysql_query("set names ‘gbk‘"); 
5 ?>

add.php

 1 <?php
 2 include ‘conn.php‘;
 3 if($_POST[‘submit‘]){
 4     $sql="INSERT INTO message(id,user,title,content,lastdate) VALUES (NULL, ‘$_POST[user]‘, ‘$_POST[title]‘, ‘$_POST[content]‘, now())";
 5     mysql_query($sql);
 6 
 7     //页面跳转，实现方式为javascript
 8     $url = "list.php";
 9     echo "<script language=‘javascript‘ type=‘text/javascript‘>";
10     echo "window.location.href=‘$url‘";
11     echo "</script>";
12 }
13 ?>
14 <script type="text/javascript">
15 function checkPost(){
16 
17     if(addForm.user.value==""){
18         alert("请输入用户名");
19         addForm.user.focus();
20         return false;
21     }
22     if(addForm.title.value.length<5){
23         alert("标题不能少于5个字符");
24         addForm.title.focus();
25         return false;
26         }
27 }
28 </script>
29 <FORM name="addForm" METHOD="POST" ACTION="add.php" onsubmit="return checkPost();">
30 用户：<INPUT TYPE="text" NAME="user" /><br />
31 标题：<INPUT TYPE="text" NAME="title" /><br />
32 内容：<TEXTAREA NAME="content" ROWS="8" COLS="30"></TEXTAREA><br />
33 <INPUT TYPE="submit" name="submit" value="add" /></FORM>

list.php

 1 <?php
 2 include ‘conn.php‘;
 3 ?>
 4 <?php 
 5 echo "<div align=‘center‘><a href=‘add.php‘>继续添加</a></div>";
 6 ?>
 7 <table width=500 border="0" align="center" cellpadding="5" cellspacing="1" bgcolor="#add3ef">
 8 <?php 
 9 $sql="select * from message order by id";
10 $query=mysql_query($sql);
11 while ($row=mysql_fetch_array($query)){
12 ?>
13 
14   <tr bgcolor="#eff3ff">
15   <td>标题：<font color="red"><?=$row[title]?></font> 用户：<font color="red"><?=$row[user] ?></font><div align="right"><a href="preEdit.php?id=<?=$row[id]?>">编辑</a>&nbsp;&nbsp;|&nbsp;&nbsp;<a href="delete.php?id=<?=$row[id]?>">删除</a></div></td>
16   </tr>
17   <tr bgColor="#ffffff">
18   <td>内容：<?=$row[content]?></td>
19   </tr>
20   <tr bgColor="#ffffff">
21   <td><div align="right">发表日期：<?=$row[lastdate]?></div></td>
22   </tr>
23   <?php }?>
24 </table>

delete.php

 1 <?php
 2 include ‘conn.php‘;
 3 $id = $_GET[‘id‘];
 4 $query="delete from message where id=".$id;
 5 mysql_query($query);
 6 ?>
 7 <?php 
 8 //页面跳转，实现方式为javascript
 9 $url = "list.php";
10 echo "<script language=‘javascript‘ type=‘text/javascript‘>";
11 echo "window.location.href=‘$url‘";
12 echo "</script>";
13 ?>

preEdit.php

 1 <?php
 2 include ‘conn.php‘;
 3 $id=$_GET[id];
 4 $query="SELECT * FROM message WHERE id =".$id;
 5 $result=mysql_query($query);
 6 while ($rs=mysql_fetch_array($result)){
 7 ?>
 8 <FORM METHOD="POST" ACTION="postEdit.php">
 9     <input type="hidden" name="id" value="<?=$rs[id]?>">
10     用户：<INPUT TYPE="text" NAME="user" value="<?=$rs[user]?>"/><br />
11     标题：<INPUT TYPE="text" NAME="title" value="<?=$rs[title]?>"/><br />
12     内容：<TEXTAREA NAME="content" ROWS="8" COLS="30"><?=$rs[content]?></TEXTAREA><br />
13     <INPUT TYPE="submit" name="submit" value="edit"/>
14 </FORM>
15 <?php }?>

postEdit.php

 1 <?php
 2 include ‘conn.php‘;
 3 $query="update message set user=‘$_POST[user]‘,title=‘$_POST[title]‘,content=‘$_POST[content]‘ where id=‘$_POST[id]‘";
 4 mysql_query($query);
 5 ?>
 6 <?php 
 7 //页面跳转，实现方式为javascript
 8 $url = "list.php";
 9 echo "<script language=‘javascript‘ type=‘text/javascript‘>";
10 echo "window.location.href=‘$url‘";
11 echo "</script>";
12 ?>