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A simple method to implement paging query in php

墨辰丷

Release： 2023-03-27 20:52:01

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This article mainly introduces in detail the method of simple implementation of paging query in PHP. It has certain reference value. Interested friends can refer to it.

About PHP, I have learned a lot recently, teacher Let me tell you, what I am learning now are all the core parts of PHP, so I paid more attention and practiced it a few more times. It is relatively easy to understand, and it is not as difficult as when I first started learning. To sum up, I feel that mentality is the most important thing. It was a question of mentality at the beginning. After considering all aspects of the problem, I couldn’t calm down. Moreover, it had been many years since I sat down to study hard. I always felt that I couldn’t sit still. After a period of rest, Including the period of time when I was at home during the Chinese New Year, my mentality has changed a lot after I came back. Learning is no longer boring. Instead, it feels like many years ago when I encountered a mathematical problem and wanted to overcome it.

I have a lot of complaints, haha. The main thing I learned this morning was paging query: if there is a lot of data, it will look a lot when displayed on one page, and it will look very tiring. Then we use paging, which has been written before, and it looks like It's relatively clear. What we learned today is paging query. It's relatively simple. It just adds a query condition on the basis of paging. This time the chinastates table is used:

The first three columns are mainly used, namely the region code, region name and parent code. When performing paging queries, please note that get is used to obtain elements. When we perform paging queries, we will see the title bar displayed as shown in the figure:

It will be more troublesome if you use post to obtain it. In this case, you need to modify it on the new page and write the third condition in the brackets. In the code identification, There are annotations, and the results are also displayed in the uploaded pictures. The query is "medium", and then I see the second page. There are no problems

<body>
<h1>分页查询</h1>
<?php
include("DADB.class.php");
$db=new DADB();
$tj= " 1=1 ";
$area="";
if(!empty($_GET["area"]))
{
 $area=$_GET["area"];
 $tj=" areaname like &#39;%{$area}%&#39;";
}

?>

<form action="fenyechaxun.php" method="get" > 

//这里用的是get 来获取
<p>地区名称：<input type="text" name="area" value="<?php echo $area; ?>"/> 

//这里如果没有传入value值 如果查询内容的数量比较多，
那么在第二页的时候将与需要查询的内容不符
<input type="submit" value="查询"/></p>
</form>

<table border="1" cellpadding="0" cellspacing="0" width="100%">
 <tr>
  <td>地区代号</td>
  <td>地区名称</td>
  <td>父级代号</td>
 </tr>

<?php

include("page.class.php");
$sqg="select count(*) from chinastates WHERE {$tj}";
//因为是需要查询，所以 select语句都要有条件
$arg=$db->Query($sqg);

$page=new page($arg[0][0],20);

 //如果前面用的是post 那么这里 可以改为new page（, , "areaname=&#39;{$area}&#39;" ）

 $sql="select * from chinastates where {$tj}" .$page->limit;
$arr=$db->Query($sql);
foreach($arr as $v)
{
 echo"<tr>
  <td>{$v[0]}</td>
  <td>{$v[1]}</td>
  <td>{$v[2]}</td>
 </tr>";
}
?>
</table>
<p> <?php
 echo $page->fpage();
 ?></p>
</body>

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