Detailed explanation of examples of implementing database paging and multi-condition query functions in PHP-PHP Tutorial-php.cn

Detailed explanation of examples of implementing database paging and multi-condition query functions in PHP

巴扎黑

Release： 2023-03-15 19:50:01

Original

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The following editor will bring you an example of using PHP to access the database to realize the paging function and multi-condition query function. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

1. Implement the paging function

<body>
<table width="100%" border="1">
 <thead>
 <tr>
  <th>代号</th>
  <th>名称</th>
  <th>价格</th>
 </tr>
 </thead>
 <tbody>
  <?php
 require_once "./DBDA.class.php";　　//加载数据库访问类的封装文件
 require_once "page.class.php";　　//加载分页类的封装文件
 $db = new DBDA();
 $sql = "select count(*) from car";
 $arr = $db->query($szts);
 
 $page = new Page($arr[0][0],5);　　//查看总数据，并每页显示的行数据
 $sql = "select * from car".$page->limit;　　//拼接每页显示的数据
 $arr = $db->query($sql);
 foreach($arr as $v){
  echo "<tr>
  <td>{$v[0]}</td>
  <td>{$v[1]}</td>
  <td>{$v[2]}</td>
 </tr>";
 }
 ?> 
 </tbody>
</table>

<p style="margin-top:20px">
 <?php
 echo $page->fpage();　　//调用分页类的方法
 ?>
</p>
</body>

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2. Implement multi-condition query function

<body>
<?php
require_once "./DBDA.class.php";
require_once "page.class.php";
$db = new DBDA();

//做一个恒成立的条件
$tj = " 1=1 ";
$tj2 = " 1=1 ";
$name = " ";
$brand = " ";
//当提交的数据不为空，需要改条件
if(!empty($_GET["name"])){
 $name = $_GET["name"];
 $tj = " name like &#39;%{$name}%&#39; ";　　//使用模糊查询查询关键信息
}
if(!empty($_GET["brand"])){
 $brand = $_GET["brand"];
 $tj2 = " brand = &#39;{$brand}&#39; ";
}

?>
<table width="100%" border="1">
<form action="test.php" method="get">
 <input type="text" name="name" placeholder="请输入名称" value="<?php echo $name ?>" style="max-width:200px; float:left">
 <input type="text" name="brand" placeholder="请输入系列" value="<?php echo $brand ?>" style="max-width:200px; float:left">
 <button type="submit" style="float:left; margin-left:10px">查询</button>
 </form>
 <thead>
 <tr>
  <th>代号</th>
  <th>名称</th>
  <th>系列</th>
  <th>时间</th>
  <th>价格</th>
 </tr>
 </thead>
 <tbody>
  <?php
 $zts = "select count(*) from car where {$tj} and {$tj2}";　　//多条件查询数据总数
 $ats = $db->query($arr);
 $page = new Page($ats[0][0],2);
 
 $sql = "select * from car where {$tj} and {$tj2} ".$page->limit;
 $arr = $db->query($sql);
 foreach($arr as $v){
  //给查询的关键字加字体颜色
  $n = str_replace($name,"<span style=&#39;color:red&#39;>{$name}</span>",$v[1]);  
  echo "<tr>
  <td>{$v[0]}</td>
  <td>{$n}</td>
  <td>{$v[2]}</td>
  <td>{$v[3]}</td>
  <td>{$v[7]}</td>
 </tr>";
 }
 ?> 
 </tbody>
</table>
<p>
<?php
echo $page->fpage();
?>
</p>
</body>

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