php mysql 查询数据库

文章提供一款简单的mysql 查询数据库数据的代码,可以查询blog里面所有数据并且显示出来,代码如下:

<?php 
session_start(); 
$conn=mysql_connect(&#39;localhost&#39;,&#39;root&#39;,&#39;root&#39;)or die(&#39;数据库连接错误&#39;); 
mysql_select_db(&#39;demo&#39;,$conn); 
mysql_query("set names &#39;gbk&#39;"); 
$us=$_session[&#39;username&#39;]; 
$selequery=mysql_query("select * from blog where author=&#39;$us&#39; order by id desc")or die("查询失败"); 
?> 
<?php while($selerow=mysql_fetch_array($selequery)){?> 
<form action="" method="post" name="modform"> 
  <table width="100%" border="1"> 
    <tr> 
      <td width="100">作者：</td> 
      <td><?php echo $_session[&#39;username&#39;]."         ".$selerow[&#39;redate&#39;];?></td> 
    </tr> 
    <tr> 
      <td width="100">留言标题：</td> 
      <td><?php echo $selerow[&#39;title&#39;];?></td> 
    </tr> 
    <tr> 
      <td>留言内容：</td> 
      <td><?php echo $selerow[&#39;content&#39;];?></td> 
    </tr> 
      <tr> 
      <td colspan="2" align="center"><input type="submit" value="修改" name="sub"></input></td> 
    </tr> 
  </table> 
 </form>  
  <br> 
  <?php }?>  
<!--<?php  
 for($i=1;$i<$selerow=mysql_num_rows($selequery);$i++){ 
  if($i<$selerow=mysql_num_rows($selequery)){?> 
  //开源代码phpfensi.com 
   <table><tr><td><?php echo $selerow[&#39;title&#39;];?></td></tr></table> 
   <hr color="red"></hr> 
  <?php  
  }else{?> 
  <table></table> 
<?php  
 }} 
?>

实例数据库代码如下:

drop table if exists `blog`; 
create table `blog` ( 
  `id` int(10) not null auto_increment, 
  `author` varchar(50) not null, 
  `title` varchar(50) not null, 
  `content` text, 
  `redate` date not null, 
  primary key (`id`) 
) engine=innodb auto_increment=5 default charset=gbk; 
-- ---------------------------- 
-- records of blog 
-- ---------------------------- 
insert into `blog` values (&#39;1&#39;, &#39;admin&#39;, &#39;我&#39;, &#39;<p>呜呜呜</p>&#39;, &#39;2010-07-31&#39;); 
insert into `blog` values (&#39;2&#39;, &#39;admin&#39;, &#39;第五&#39;, &#39;<p>我的</p>&#39;, &#39;2010-07-31&#39;); 
insert into `blog` values (&#39;3&#39;, &#39;admin&#39;, &#39;我的&#39;, &#39;<p>去权威的物权法</p>&#39;, &#39;2010-07-31&#39;); 
insert into `blog` values (&#39;4&#39;, &#39;111111&#39;, &#39;大武器&#39;, &#39;<p>的弯曲的千万</p>&#39;, &#39;2010-07-31&#39;);

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