php之留言板

留言板或者说一个小的博客系统有如下功能，编写标题内容并用mySQL保存，修改，删除。

1 <?php
2     @mysql_connect("localhost:3306", "root", "") or die("mysql连接失败");
3     @mysql_select_db("php100") or die("db连接失败");
4     //mysql_set_charset("gbk");        5.2.3以上可以这样写，纠正函数编码
5     mysql_query("set names ‘gb2312_chinese_ci‘");    //
6     mysql_query("SET NAMES ‘UTF8‘"); //以此来保证网页传送中文汉字进入数据库时不会变成乱码
7 ?>

conn.php

 1 <a href=‘add.php‘>添加内容</a>
 2 <hr>
 3 <?php
 4     header("Content-type: text/html; charset=utf-8");//保证正常显示中文
 5     include_once ("conn.php");
 6
 7     $sql = "select * from `news` order by id desc";
 8     $query = mysql_query($sql);
 9
10     while( $rs = mysql_fetch_array($query)) {//执行一次向下读取一条数据
11
12 ?>
13     <h2>标题：<?php echo $rs["title"] ?> |
14         <a href="edit.php?ed=<?php echo $rs[‘id‘]?>">编辑</a> |
15         <a href="del.php?del=<?php echo $rs[‘id‘]?>">删除</a> |</h2>
16     <li>时间：<?php echo $rs["dates"] ?></li>
17     <p><?php echo $rs["contents"] ?></p>
18     <hr>
19 <?php//典型的混编，简直醉了
20     }
21 ?>

index.php

 1 <?php//添加内容页面
 2     header("Content-type: text/html; charset=utf-8");
 3     include ("conn.php");//引入连接数据库
 4
 5     if(!empty($_POST[‘sub‘])){
 6         $title = $_POST[‘title‘];
 7         $con = $_POST[‘con‘];
 8         /*$sql = "CREATE TABLE news //这个是建立表的语句
 9         (
10             id INT(5) NOT NULL AUTO_INCREMENT,
11             PRIMARY KEY(id),
12             title VARCHAR(50),
13             dates DATE,
14             contents TEXT
15         )";*/
16         $sql="insert into `news` (`id`,`title`,`dates`, `contents`) value (null, ‘$title‘,now(),‘$con‘)";
17
18         echo $sql."<br/>";
19         mysql_query($sql);
20         echo "insert is ok";
21     }
22
23
24 ?>
25
26 <form action="add.php" method="post">
27 标题<input type="text" name="title"><br>
28 内容<textarea rows="5" cols="50" name="con"></textarea><br>
29 <input type="submit" name="sub" value="发表">
30 </form>

add.php

 1 <?php
 2
 3     include ("conn.php");
 4     header("Content-type: text/html; charset=utf-8");
 5
 6     if(!empty($_GET[‘del‘])) {//在index页面中，连接后面接着的?del=‘$id‘可以用get方法获得，以此来简单的传递信息
 7         $d = $_GET[‘del‘];
 8         $sql = "delete from `news` where `id` = ‘$d‘";
 9         mysql_query($sql);
10         echo "删除成功";
11     }
12 ?>

del.php

 1 <?php
 2     include_once("conn.php");
 3     header("Content-type: text/html; charset=utf-8");
 4     if(!empty($_GET[‘ed‘])){//同样用链接的后缀传递id
 5         $ed = $_GET[‘ed‘];
 6         $sql = "select * from `news` where `id`=‘$ed‘";
 7         $query = mysql_query($sql);
 8         $rs = mysql_fetch_array($query);
 9 ?>
10
11 <h2>标题：<?php echo $rs[‘title‘]?></h2>
12 <li>时间：<?php echo $rs[‘dates‘]?></li>
13 <form method="POST" action="edit.php">
14 <input type="hidden" name="hid" value="<?php echo $ed?>"/>//隐藏的id来传递，用post方法，这种写法也学会，并不会在页面显示
15 内容：<textarea name="con" rows="5" cols="40"><?php echo $rs[‘contents‘]?></textarea>
16 <br><br>
17 <input type="submit" name="submit" value="修改"/>
18 </form>
19
20 <?php
21     }
22
23     if(!empty($_POST[‘submit‘])) {
24         $content = $_POST[‘con‘];
25         $hid = $_POST[‘hid‘];
26         $sql = "update `news` set `contents`=‘$content‘ where `id`=‘$hid‘";
27         mysql_query($sql);
28         echo "<script>alert(‘更新成功‘);location.href=‘index.php‘</script>";
29     }
30
31 ?>

edit.php

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