Implementation of PHP advanced search function and dynamic splicing of sql

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Implementation of PHP's advanced search function and dynamic splicing of sql. The completed functions include: query based on one condition alone, or comprehensive query based on multiple conditions. The difficulty lies in dynamically splicing SQL.

Completed effect

General picture

##Fuzzy query based on name alone

Query based on gender alone

Comprehensive query based on multiple conditions

Front page code

姓名: 
 
性别:
男
女
 
年龄:
 
邮箱:

Background processing code

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

dynamic splicing sql

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

		switch ($name) {
			//未输入姓名
			case null:
				$name_info='';
				break;
			     //Implementation of PHP advanced search function and dynamic splicing of sql
			    default:
				$name_info=" and name LIKE '%".$name."%'";
				break;
		}
		switch ($sex) {
			//未输入性别
			case null:
				$sex_info='';
				break;
			//根据性别准确查询
			default:
				$sex_info=' and sex='.$sex;
				break;
		}
		switch ($age) {
			//未输入年龄
			case null:
				$age_info='';
				break;
			//根据年龄准确查询
			default:
				$age_info=' and age='.$age;
				break;
		}
		switch ($email) {
			//未输入邮箱
			case null:
				$email_info='';
				break;
			//根据邮箱模糊查询
			default:
				$email_info=" and email LIKE '%".$email."%'";
				break;
		}$search_sql='SELECT * FROM users WHERE 1=1'.$name_info.$sex_info.$age_info.$email_info;'';return $search_sql;
	}

Relevant learning recommendations:

mysql tutorial(video)

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