完成的效果

总画面

在这里插入图片描述

单独根据姓名模糊查询

根据姓名模糊查询

单独根据性别查询

在这里插入图片描述

根据多个条件综合查询

在这里插入图片描述

前台页面代码

<form action="" method="post">
<labal>姓名:</labal> <input style="width:105px" type="text" name="search_name" id="search_name" placeholder="姓名">
&nbsp
<labal>性别:</labal>
<input type="radio" name="search_sex" id="man" value="0">男
<input type="radio" name="search_sex" id="women" value="1">女
&nbsp
<labal>年龄:</labal><input style="width:105px" type="text" name="search_age" id="add_age"placeholder="年龄">
&nbsp
<labal>邮箱:</labal><input style="width:150px" type="text" name="search_email" id="search_email" placeholder="邮箱">
<input id="b" name="submit" style="width:60px" type="submit" value="检索">
</form>

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后台处理代码

//接收用户输入的数据$name = $sex = $age = $email = "";if (isset($_POST[&#39;submit&#39;])) {
    if (isset($_POST[&#39;search_name&#39;])) {
    	$name = $_POST[&#39;search_name&#39;];
    }
    if (isset($_POST[&#39;search_sex&#39;])) {
    	$sex = $_POST[&#39;search_sex&#39;];
    }
    if (isset($_POST[&#39;search_age&#39;])) {
    	$age = $_POST[&#39;search_age&#39;];
    }
    if (isset($_POST[&#39;search_email&#39;])) {
    	$email = $_POST[&#39;search_email&#39;];
    }//执行检索sql$search_sql = $myTest->searchData($name,$sex,$age,$email);$result = $myTest->sqlRun($search_sql);

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动态拼接sql

public function searchData($name,$sex,$age,$email){

		switch ($name) {
			//未输入姓名
			case null:
				$name_info=&#39;&#39;;
				break;
			     //根据姓名模糊查询
			    default:
				$name_info=" and name LIKE &#39;%".$name."%&#39;";
				break;
		}
		switch ($sex) {
			//未输入性别
			case null:
				$sex_info=&#39;&#39;;
				break;
			//根据性别准确查询
			default:
				$sex_info=&#39; and sex=&#39;.$sex;
				break;
		}
		switch ($age) {
			//未输入年龄
			case null:
				$age_info=&#39;&#39;;
				break;
			//根据年龄准确查询
			default:
				$age_info=&#39; and age=&#39;.$age;
				break;
		}
		switch ($email) {
			//未输入邮箱
			case null:
				$email_info=&#39;&#39;;
				break;
			//根据邮箱模糊查询
			default:
				$email_info=" and email LIKE &#39;%".$email."%&#39;";
				break;
		}$search_sql=&#39;SELECT * FROM users WHERE 1=1&#39;.$name_info.$sex_info.$age_info.$email_info;&#39;&#39;;return $search_sql;
	}

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相关学习推荐：mysql教程(视频)

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