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单条件查询php

2024-09-05 16:06:45   215人阅读

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" />
    <input type="submit" value="http://www.mamicode.com/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

$name = "";//外面要写一个默认值，若不写，当不走if时会没有值

if(!empty($_POST))
{
    $name = $_POST[‘name‘];
    $tj = " Name like ‘%{$name}%‘ ";
}
//将条件拼接到SQL语句
$sql = "select * from contacts where {$tj}";
//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>

 

单条件查询php


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