How to recursively query all data in mysql-Mysql Tutorial-php.cn

Home

Database

Mysql Tutorial

How to recursively query all data in mysql

coldplay.xixi

Nov 12, 2020 am 09:46 AM

mysql recursive query

Mysql method of recursively querying all data: first create the table and initialize the data; then use the [find_in_set()] function and the [group_concat()] function to implement the recursive query. The code is [SELECT queryChildrenAreaInfo(1); 】.

How to recursively query all data in mysql

More related free learning recommendations: mysql tutorial(video)

mysql recursive query method for all data:

1. Create table

DROP TABLE IF EXISTS `t_areainfo`;
CREATE TABLE `t_areainfo` (
 `id` int(11) NOT &#39;0&#39; AUTO_INCREMENT,
 `level` int(11) DEFAULT &#39;0&#39;,
 `name` varchar(255) DEFAULT &#39;0&#39;,
 `parentId` int(11) DEFAULT &#39;0&#39;,
 `status` int(11) DEFAULT &#39;0&#39;,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=65 DEFAULT CHARSET=utf8;

Copy after login

2. Initial data

INSERT INTO `t_areainfo` VALUES (&#39;1&#39;, &#39;0&#39;, &#39;中国&#39;, &#39;0&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;2&#39;, &#39;0&#39;, &#39;华北区&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;3&#39;, &#39;0&#39;, &#39;华南区&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;4&#39;, &#39;0&#39;, &#39;北京&#39;, &#39;2&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;5&#39;, &#39;0&#39;, &#39;海淀区&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;6&#39;, &#39;0&#39;, &#39;丰台区&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;7&#39;, &#39;0&#39;, &#39;朝阳区&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;8&#39;, &#39;0&#39;, &#39;北京XX区1&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;9&#39;, &#39;0&#39;, &#39;北京XX区2&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;10&#39;, &#39;0&#39;, &#39;北京XX区3&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;11&#39;, &#39;0&#39;, &#39;北京XX区4&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;12&#39;, &#39;0&#39;, &#39;北京XX区5&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;13&#39;, &#39;0&#39;, &#39;北京XX区6&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;14&#39;, &#39;0&#39;, &#39;北京XX区7&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;15&#39;, &#39;0&#39;, &#39;北京XX区8&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;16&#39;, &#39;0&#39;, &#39;北京XX区9&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;17&#39;, &#39;0&#39;, &#39;北京XX区10&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;18&#39;, &#39;0&#39;, &#39;北京XX区11&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;19&#39;, &#39;0&#39;, &#39;北京XX区12&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;20&#39;, &#39;0&#39;, &#39;北京XX区13&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;21&#39;, &#39;0&#39;, &#39;北京XX区14&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;22&#39;, &#39;0&#39;, &#39;北京XX区15&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;23&#39;, &#39;0&#39;, &#39;北京XX区16&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;24&#39;, &#39;0&#39;, &#39;北京XX区17&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;25&#39;, &#39;0&#39;, &#39;北京XX区18&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;26&#39;, &#39;0&#39;, &#39;北京XX区19&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;27&#39;, &#39;0&#39;, &#39;北京XX区1&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;28&#39;, &#39;0&#39;, &#39;北京XX区2&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;29&#39;, &#39;0&#39;, &#39;北京XX区3&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;30&#39;, &#39;0&#39;, &#39;北京XX区4&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;31&#39;, &#39;0&#39;, &#39;北京XX区5&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;32&#39;, &#39;0&#39;, &#39;北京XX区6&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;33&#39;, &#39;0&#39;, &#39;北京XX区7&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;34&#39;, &#39;0&#39;, &#39;北京XX区8&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;35&#39;, &#39;0&#39;, &#39;北京XX区9&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;36&#39;, &#39;0&#39;, &#39;北京XX区10&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;37&#39;, &#39;0&#39;, &#39;北京XX区11&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;38&#39;, &#39;0&#39;, &#39;北京XX区12&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;39&#39;, &#39;0&#39;, &#39;北京XX区13&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;40&#39;, &#39;0&#39;, &#39;北京XX区14&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;41&#39;, &#39;0&#39;, &#39;北京XX区15&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;42&#39;, &#39;0&#39;, &#39;北京XX区16&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;43&#39;, &#39;0&#39;, &#39;北京XX区17&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;44&#39;, &#39;0&#39;, &#39;北京XX区18&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;45&#39;, &#39;0&#39;, &#39;北京XX区19&#39;, &#39;4&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;46&#39;, &#39;0&#39;, &#39;xx省1&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;47&#39;, &#39;0&#39;, &#39;xx省2&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;48&#39;, &#39;0&#39;, &#39;xx省3&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;49&#39;, &#39;0&#39;, &#39;xx省4&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;50&#39;, &#39;0&#39;, &#39;xx省5&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;51&#39;, &#39;0&#39;, &#39;xx省6&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;52&#39;, &#39;0&#39;, &#39;xx省7&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;53&#39;, &#39;0&#39;, &#39;xx省8&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;54&#39;, &#39;0&#39;, &#39;xx省9&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;55&#39;, &#39;0&#39;, &#39;xx省10&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;56&#39;, &#39;0&#39;, &#39;xx省11&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;57&#39;, &#39;0&#39;, &#39;xx省12&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;58&#39;, &#39;0&#39;, &#39;xx省13&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;59&#39;, &#39;0&#39;, &#39;xx省14&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;60&#39;, &#39;0&#39;, &#39;xx省15&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;61&#39;, &#39;0&#39;, &#39;xx省16&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;62&#39;, &#39;0&#39;, &#39;xx省17&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;63&#39;, &#39;0&#39;, &#39;xx省18&#39;, &#39;1&#39;, &#39;0&#39;);
INSERT INTO `t_areainfo` VALUES (&#39;64&#39;, &#39;0&#39;, &#39;xx省19&#39;, &#39;1&#39;, &#39;0&#39;);

Copy after login

3. Downward recursion

Use the find_in_set() function and the group_concat() function to implement recursive query:

DROP FUNCTION IF EXISTS queryChildrenAreaInfo;
DELIMITER ;;
CREATE FUNCTION queryChildrenAreaInfo(areaId INT)
RETURNS VARCHAR(4000)
BEGIN
DECLARE sTemp VARCHAR(4000);
DECLARE sTempChd VARCHAR(4000);
SET sTemp=&#39;$&#39;;
SET sTempChd = CAST(areaId AS CHAR);
WHILE sTempChd IS NOT NULL DO
SET sTemp= CONCAT(sTemp,&#39;,&#39;,sTempChd);
SELECT GROUP_CONCAT(id) INTO sTempChd FROM t_areainfo WHERE FIND_IN_SET(parentId,sTempChd)>0;
END WHILE;
RETURN sTemp;
END
;;
DELIMITER ;

Copy after login

4. Calling method

SELECT queryChildrenAreaInfo(1);

Copy after login

How to recursively query all data in mysql

Query all nodes under the ID "4"

SELECT * FROM t_areainfo WHERE FIND_IN_SET(id,queryChildrenAreaInfo(4));

Copy after login

How to recursively query all data in mysql

5. Upward recursion

DROP FUNCTION IF EXISTS queryChildrenAreaInfo1;
DELIMITER;;
CREATE FUNCTION queryChildrenAreaInfo1(areaId INT)
RETURNS VARCHAR(4000)
BEGIN
DECLARE sTemp VARCHAR(4000);
DECLARE sTempChd VARCHAR(4000);
SET sTemp=&#39;$&#39;;
SET sTempChd = CAST(areaId AS CHAR);
SET sTemp = CONCAT(sTemp,&#39;,&#39;,sTempChd);
SELECT parentId INTO sTempChd FROM t_areainfo WHERE id = sTempChd;
WHILE sTempChd <> 0 DO
SET sTemp = CONCAT(sTemp,&#39;,&#39;,sTempChd);
SELECT parentId INTO sTempChd FROM t_areainfo WHERE id = sTempChd;
END WHILE;
RETURN sTemp;
END
;;
DELIMITER ;

Copy after login

6. Calling method

Query all superior nodes of the node with id "7":

SELECT * from t_areainfo where FIND_IN_SET(id,queryChildrenAreaInfo1(7));

Copy after login

How to recursively query all data in mysql

The above is the detailed content of How to recursively query all data in mysql. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Assassin's Creed Shadows: Seashell Riddle Solution

4 weeks ago By DDD

What's New in Windows 11 KB5054979 & How to Fix Update Issues

3 weeks ago By DDD

Where to find the Crane Control Keycard in Atomfall

4 weeks ago By DDD

Roblox: Dead Rails - How To Complete Every Challenge

1 months ago By DDD

How to fix KB5055523 fails to install in Windows 11?

2 weeks ago By DDD

Hot Tools

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Where is the login entrance for gmail email?

7722

Java Tutorial

1642

CakePHP Tutorial

1396

Laravel Tutorial

1289

PHP Tutorial

1233

Related knowledge

MySQL: An Introduction to the World's Most Popular Database Apr 12, 2025 am 12:18 AM

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL's Place: Databases and Programming Apr 13, 2025 am 12:18 AM

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

Why Use MySQL? Benefits and Advantages Apr 12, 2025 am 12:17 AM

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

How to connect to the database of apache Apr 13, 2025 pm 01:03 PM

Apache connects to a database requires the following steps: Install the database driver. Configure the web.xml file to create a connection pool. Create a JDBC data source and specify the connection settings. Use the JDBC API to access the database from Java code, including getting connections, creating statements, binding parameters, executing queries or updates, and processing results.

How to start mysql by docker Apr 15, 2025 pm 12:09 PM

The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database

MySQL's Role: Databases in Web Applications Apr 17, 2025 am 12:23 AM

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

Laravel Introduction Example Apr 18, 2025 pm 12:45 PM

Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.

How to install mysql in centos7 Apr 14, 2025 pm 08:30 PM

The key to installing MySQL elegantly is to add the official MySQL repository. The specific steps are as follows: Download the MySQL official GPG key to prevent phishing attacks. Add MySQL repository file: rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Update yum repository cache: yum update installation MySQL: yum install mysql-server startup MySQL service: systemctl start mysqld set up booting

See all articles