SpringBoot整合Sharding?JDBC实现MySQL8读写分离,久久派带你了解更多相关信息。
目录
- 一.前言
- 二.项目目录结构
- 三.pom文件
- 四.配置文件(基于YAML)及SQL建表语句
- 五.Mapper.xml文件及Mapper接口
- 六 .Controller及Mocel文件
- 七.结果
- 八.Sharding-JDBC不同版本上的配置
一.前言
这是一个基于SpringBoot整合Sharding-JDBC实现读写分离的极简教程,笔者使用到的技术及版本如下:
- SpringBoot 2.5.2
- MyBatis-Plus 3.4.3
- Sharding-JDBC 4.1.1
- MySQL8集群(看笔者前一篇文章有部署教程)
二.项目目录结构
三.pom文件
<?xml version=\"1.0\" encoding=\"UTF-8\"?><project xmlns=\"http://maven.apache.org/POM/4.0.0\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd\"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.5.2</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>xyz.hcworld</groupId> <artifactId>sharding-jdbc-demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>sharding-jdbc-demo</name> <description>多数据源切换实例</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- mybatis-plus依赖 --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.3</version> </dependency> <!-- mysql驱动 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <!-- sharding-jdbc(多数据源切换) --> <dependency> <groupId>org.apache.shardingsphere</groupId> <artifactId>sharding-jdbc-spring-boot-starter</artifactId> <version>4.1.1</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <excludes> <exclude> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </exclude> </excludes> </configuration> </plugin> </plugins> </build></project>
四.配置文件(基于YAML)及SQL建表语句
spring: main: allow-bean-definition-overriding: true #显示sql shardingsphere: props: sql: show: true masterslave: #配置主从名称 name: ms #置主库master,负责数据的写入 master-data-source-name: ds1 #配置从库slave节点 slave-data-source-names: ds2,ds3 #配置slave节点的负载均衡均衡策略,采用轮询机制,有两种算法:round_robin(轮询)和random(随机) load-balance-algorithm-type: round_robin sharding: #配置默认数据源ds1 默认数据源,主要用于写 default-data-source-name: ds1 # 配置数据源 datasource: names: ds1,ds2,ds3 #master-ds1数据库连接信息 ds1: type: com.zaxxer.hikari.HikariDataSource driver-class-name: com.mysql.cj.jdbc.Driver jdbc-url: jdbc:mysql://192.168.2.142:3307/sharding-jdbc-db?useUnicode=true&useSSL=false&serverTimezone=Asia/Shanghai username: root password: 123456 maxPoolSize: 100 minPoolSize: 5 #slave-ds2数据库连接信息 ds2: type: com.zaxxer.hikari.HikariDataSource driver-class-name: com.mysql.cj.jdbc.Driver jdbc-url: jdbc:mysql://192.168.2.142:3308/sharding-jdbc-db?useUnicode=true&useSSL=false&serverTimezone=Asia/Shanghai username: root password: 123456 maxPoolSize: 100 minPoolSize: 5 #slave-ds3数据库连接信息 ds3: type: com.zaxxer.hikari.HikariDataSource driver-class-name: com.mysql.cj.jdbc.Driver jdbc-url: jdbc:mysql://192.168.2.142:3309/sharding-jdbc-db?useUnicode=true&useSSL=false&serverTimezone=Asia/Shanghai username: root password: 123456 maxPoolSize: 100 minPoolSize: 5#mybatis-plus配置mybatis-plus: type-aliases-package: xyz.hcworld.demo.model mapper-locations: classpath*:/mapper/**Mapper.xml
CREATE TABLE `t_user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `nickname` varchar(100) DEFAULT NULL, `password` varchar(100) DEFAULT NULL, `sex` int(11) DEFAULT NULL, `birthday` varchar(50) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;
五.Mapper.xml文件及Mapper接口
<?xml version=\"1.0\" encoding=\"UTF-8\"?><!DOCTYPE mapper PUBLIC \"-//mybatis.org//DTD Mapper 3.0//EN\" \"http://mybatis.org/dtd/mybatis-3-mapper.dtd\"><mapper namespace=\"xyz.hcworld.demo.mapper.UserMapper\"> <update id=\"addUser\"> INSERT INTO t_user(nickname,PASSWORD,sex,birthday) VALUES(#{nickname},#{password},#{sex},#{birthday}) </update> <select id=\"findUsers\" resultType=\"xyz.hcworld.demo.model.User\"> SELECT id, nickname, PASSWORD, sex, birthday FROM t_user; </select></mapper>
package xyz.hcworld.demo.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import org.springframework.stereotype.Component;import xyz.hcworld.demo.model.User;import java.util.List;/** * @ClassName: UserMapper * @Author: 张红尘 * @Date: 2021-07-20 * @Version: 1.0 */@Componentpublic interface UserMapper extends BaseMapper<User> { void addUser(User user); List<User> findUsers();}
六 .Controller及Mocel文件
package xyz.hcworld.demo.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import xyz.hcworld.demo.mapper.UserMapper;import xyz.hcworld.demo.model.User;import java.security.SecureRandom;import java.util.List;/** * @ClassName: UserController * @Author: 张红尘 * @Date: 2021-07-20 * @Version: 1.0 */@RestController@RequestMapping(\"/api/user\")public class UserController { @Autowired private UserMapper userMapper; @PostMapping(\"/save\") public String addUser() { User user = new User(); user.setNickname(\"zhangsan\" + new SecureRandom().nextInt()); user.setPassword(\"123456\"); user.setSex(1); user.setBirthday(\"1997-12-03\"); userMapper.addUser(user); return user.toString(); } @GetMapping(\"/findUsers\") public List<User> findUsers() { return userMapper.findUsers(); }}
package xyz.hcworld.demo.model;import com.baomidou.mybatisplus.annotation.IdType;import com.baomidou.mybatisplus.annotation.TableId;import com.baomidou.mybatisplus.annotation.TableName;import lombok.Data;import lombok.EqualsAndHashCode;/** * @ClassName: User * @Author: 张红尘 * @Date: 2021-07-20 * @Version: 1.0 */@Data@TableName(\"t_user\")public class User { private static final long serialVersionUID = 1L; @TableId(value = \"id\", type = IdType.AUTO) private Integer id; private String nickname; private String password; private Integer sex; private String birthday;}
七.结果
从结果可以看出,写入操作全部通过ds1数据库(master)数据库完成,而读操作因为设置了轮询的缘故,由ds2(slaver)、ds3(slaver2)数据库完成。这样就实现了基于一主二从的数据库集群的读写分离操作。
八.Sharding-JDBC不同版本上的配置
网上Sharding-JDBC的教程多为4.0.0.RC1版本,笔者使用的是最新的4.1.1所以
在该部分数据库地址在4.1.1为jdbc-url在4.0.0.RC1上需要改为url否则会启动失败
jdbc-url: jdbc:mysql://XXXX/XXXX
且网上教程多为properties文件,笔者将其转变为YAML文件更加能直观感受
项目下载
GitHub:https://github.com/z875479694h/sharding-jdbc-demo
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