1.链接数据库通用方法：conn.php

<?php 
    //第一步：链接数据库 
    $conn=@mysql_connect("localhost:3306","root","root")or die ("mysql链接失败"); 
    //第二步: 选择指定的数据库，设置字符集 
    @mysql_select_db("php_blog",$conn) or die ("db链接失败".mysql_error()); 
    mysql_query('SET NAMES UTF8')or die ("字符集设置错误"); 
?> 

2.增加 add.php

<?php 
    include("conn.php");//引入链接数据库 
    if(!empty($_POST['sub'])){ 
    $title=$_POST['title']; 
    $con=$_POST['con']; 
    echo $sql="insert into news(id,title,dates,contents) value (null,'$title',now(),'$con')" ; 
    mysql_query($sql); 
    echo"插入成功"; 
    } 
?> 
<form action="add.php" method="post"> 
    标题: <input type="text" name="title"><br> 
    内容: <textarea rows="5" cols="50" name="con"></textarea><br> 
    <input type="submit" name="sub" value="发表"> 
</form> 

3.删除del.php

<?php 
    include("conn.php");//引入链接数据库
?>
<pre name="code" class="html">
<?php 
    include("conn.php");//引入链接数据库 
    if(!empty ($_GET['id'])){ 
        $sql="select * from news where id='".$_GET['id']."'"; 
        $query=mysql_query($sql); 
        $rs=mysql_fetch_array($query); 
    } 
    if(!empty($_POST['sub'])){ 
        $title=$_POST['title']; 
        $con=$_POST['con']; 
        $hid=$_POST['hid']; 
        $sql="update news set title='$title',contents='$con' where id='$hid' limit 1 "; 
        mysql_query($sql); 
        echo "<script> alert('更新成功'); location.href='index.php'</script>"; 
        echo"更新成功"; 
    } 
?> 
<form action="edit.php" method="post"> 
    <input type="hidden" name="hid" value="<?php echo $rs['id']?>"/> 
    标题: <input type="text" name="title" value="<?php echo $rs['title']?>"><br> 
    内容: <textarea rows="5" cols="50" name="con"><?php echo $rs['contents']?></textarea><br> 
    <input type="submit" name="sub" value="发表"> 
</form>
</pre><br> 
<?php
    if(!empty($_GET['del'])){
        $d=$_GET['del']; $sql="delete from news where id ='$d'"; } $query=mysql_query($sql); echo "删除成功"; 
?>

4，改 edit.php页面

<pre name="code" class="html">
<?php 
    include("conn.php");//引入链接数据库 
    if(!empty ($_GET['id'])){ 
        $sql="select * from news where id='".$_GET['id']."'"; 
        $query=mysql_query($sql); 
        $rs=mysql_fetch_array($query); 
    } 
    if(!empty($_POST['sub'])){ 
        $title=$_POST['title']; 
        $con=$_POST['con']; 
        $hid=$_POST['hid']; 
        $sql="update news set title='$title',contents='$con' where id='$hid' limit 1 "; 
        mysql_query($sql); 
        echo "<script> alert('更新成功'); location.href='index.php'</script>"; 
        echo"更新成功"; 
    } 
?> 
<form action="edit.php" method="post"> 
    <input type="hidden" name="hid" value="<?php echo $rs['id']?>"/> 
    标题: <input type="text" name="title" value="<?php echo $rs['title']?>"><br> 
    内容: <textarea rows="5" cols="50" name="con"><?php echo $rs['contents']?></textarea><br> 
    <input type="submit" name="sub" value="发表"> 
</form>
</pre>

5.查，列表页面

<pre name="code" class="html"><a href="add.php">添加内容</a>  
<hr> 
<form> 
    <input type="text" name="keys" /> 
    <input type="submit" name="subs" value="搜索"/> 
</form> 
<?php 
    include("conn.php");//引入链接数据库 
    if(!empty($_GET['keys'])){ 
        $w=" title like '%".$_GET['keys']."%'"; 
    }else{ 
        $w=1; 
    } 
    $sql="select * from news where $w order by id desc"; 
    $query=mysql_query($sql); 
    while($rs=mysql_fetch_array($query)){ 
?> 
    <h2>标题:<a href="view.php?id=<?php echo $rs['id'] ?>"><?php echo $rs['title'] ?></a> <a href="edit.php?id=<?php echo $rs['id'] ?>">编辑</a>｜｜<a href="del.php?del=<?php echo $rs['id'] ?>">删除</a></h2> 
    <li><?php echo $rs['dates'] ?></li> 
    <p><?php echo $rs['contents'] ?></p> 
    <hr> 
    <?php 
    } 
    ?> 
</pre>