条件查询php

页面1.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>无标题文档</title>

</head>

<body>

<h1>信息</h1>

<form action="1.php" method="post">

<div>

    请输入姓名：<input type="text" name="name" />
　　电话：<input type="text" name="tel" />

    <input type="submit" value="查询" />

</div>

</form>

<br />

<table width="100%" border="1" cellpadding="0" cellspacing="0">

<tr>

    <td>代号</td>

    <td>姓名</td>

    <td>电话</td>

    <td>分组</td>

</tr>

<?php

//实现两个逻辑

//1.如果没有POST数据，查所有

//2.如果有POST数据，根据条件查

$db = new MySQLi("localhost","root","root","dbname");

/*if(POST传值)

{

    SQL语句1

}

else

{

    SQL语句2

}

*/

$tj = " 1=1 "; //默认条件,前后最好带有空格

$tj2 =" 1=1 ";

$name = "";//外面要写一个默认值，若不写，当不走if时会没有值

$tel = "";

if(!empty($_POST["name"]))

{

    $name = $_POST["name"];

    $tj = " Name like '%{$name}%' ";

}

if(!empty($_POST["tel"]))

{

    $tel = $_POST["tel"];

    $tj = " Tel = '{$tel}' ";

}
//将条件拼接到SQL语句
 $sql = "select * from contacts where {$tj} and {$tj2}";

//echo $sql; 
$result = $db->query($sql); 
while($arr = $result->fetch_row()) { 
//关键字的特殊显示  
$str = str_replace($name,"<mark>{$name}</mark>",$arr[1]); 
//查找替换 
//substr_replace(); //指定位置替换 
echo "<tr> <td>{$arr[0]}</td> 
<td>{$str}</td> 
<td>{$arr[2]}</td> 
<td>{$arr[3]}</td> 
</tr>"; } 
?> 
</table> 
</body> 
</html>

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