0101读写分离测试-jdbc-shardingsphere-中间件

1 前言

shardingshpere-jdbc定位为轻量级 Java 框架，在 Java 的 JDBC 层提供的额外服务。 它使用客户端直连数据库，以 jar 包形式提供服务，无需额外部署和依赖，可理解为增强版的 JDBC 驱动，完全兼容 JDBC 和各种 ORM 框架。

关于mysql配置主从复制，可以参考之前写的文章=0101docker mysql8镜像主从复制-运维-mysql=

2、创建SpringBoot程序

2.1、创建项目

项目类型：Spring Initializr

SpringBoot脚手架：http://start.aliyun.com

项目名：sharding-jdbc-demo

SpringBoot版本：2.7.10

2.2、添加依赖

<?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>
    <groupId>com.gaogzhen</groupId>
    <artifactId>sharging-jdbc-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sharging-jdbc-demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.10</version>
        <relativePath />
    </parent>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.7.10</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-jdbc-core-spring-boot-starter</artifactId>
            <version>5.1.1</version>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.1</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.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <configuration>
                    <mainClass>com.gaogzhen.shardingjdbcdemo.ShardingJdbcDemoApplication</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

2.3、生成实体类、service与Mapper

使用idea插件mybatisX，根据数据库连接表生成实体类、service、mapper

第一步：如下图2.3-1所示

第二步：如下图2.3-2所示:

• 实体类

package com.gaogzhen.shardingjdbcdemo.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import java.io.Serializable;
import lombok.Data;

/**
 * 用户
 * @author gaogzhen
 * @TableName t_user
 */
@TableName(value ="t_user")
@Data
public class User implements Serializable {
    @TableField(exist = false)
    private static final long serialVersionUID = 1L;

    @TableId(type = IdType.AUTO)
    private Long id;

    /**
     * 用户名
     */
    private String name;

}

• service

package com.gaogzhen.shardingjdbcdemo.service;

import com.gaogzhen.shardingjdbcdemo.entity.User;
import com.baomidou.mybatisplus.extension.service.IService;

/**
* @author gaogzhen
* @description 针对表【t_user】的数据库操作Service
* @createDate 2023-08-13 15:37:14
*/
public interface UserService extends IService<User> {

}

• serviceImpl

package com.gaogzhen.shardingjdbcdemo.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.gaogzhen.shardingjdbcdemo.entity.User;
import com.gaogzhen.shardingjdbcdemo.service.UserService;
import com.gaogzhen.shardingjdbcdemo.mapper.UserMapper;
import org.springframework.stereotype.Service;

/**
* @author gaogzhen
* @description 针对表【t_user】的数据库操作Service实现
* @createDate 2023-08-13 15:37:14
*/
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

}

• mapper

package com.gaogzhen.shardingjdbcdemo.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.gaogzhen.shardingjdbcdemo.entity.User;
import org.apache.ibatis.annotations.Mapper;

/**
* @author gaogzhen
* @description 针对表【t_user】的数据库操作Mapper
* @createDate 2023-08-13 15:37:14
* @Entity com.gaogzhen.shardingjdbcdemo.entity.User
*/
@Mapper
public interface UserMapper extends BaseMapper<User> {

}

1.5、配置读写分离

application.properties：

# 应用名称
spring.application.name=sharging-jdbc-demo
# 开发环境设置
spring.profiles.active=dev
# 内存模式
spring.shardingsphere.mode.type=Memory

# 配置真实数据源
spring.shardingsphere.datasource.names=master,slave1,slave2

# 配置第 1 个数据源
spring.shardingsphere.datasource.master.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.master.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.master.jdbc-url=jdbc:mysql://127.0.0.1:3340/db_user?allowPublicKeyRetrieval=true&useSSL=false
spring.shardingsphere.datasource.master.username=root
spring.shardingsphere.datasource.master.password=123456

# 配置第 2 个数据源
spring.shardingsphere.datasource.slave1.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.slave1.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.slave1.jdbc-url=jdbc:mysql://127.0.0.1:3341/db_user?allowPublicKeyRetrieval=true&useSSL=false
spring.shardingsphere.datasource.slave1.username=root
spring.shardingsphere.datasource.slave1.password=123456

# 配置第 3 个数据源
spring.shardingsphere.datasource.slave2.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.slave2.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.slave2.jdbc-url=jdbc:mysql://127.0.0.1:3342/db_user?allowPublicKeyRetrieval=true&useSSL=false
spring.shardingsphere.datasource.slave2.username=root
spring.shardingsphere.datasource.slave2.password=123456

# 读写分离类型，如: Static，Dynamic
spring.shardingsphere.rules.readwrite-splitting.data-sources.myds.type=Static
# 写数据源名称
spring.shardingsphere.rules.readwrite-splitting.data-sources.myds.props.write-data-source-name=master
# 读数据源名称，多个从数据源用逗号分隔
spring.shardingsphere.rules.readwrite-splitting.data-sources.myds.props.read-data-source-names=slave1,slave2

# 负载均衡算法名称
spring.shardingsphere.rules.readwrite-splitting.data-sources.myds.load-balancer-name=alg_round

# 负载均衡算法配置
# 负载均衡算法类型
spring.shardingsphere.rules.readwrite-splitting.load-balancers.alg_round.type=ROUND_ROBIN
spring.shardingsphere.rules.readwrite-splitting.load-balancers.alg_random.type=RANDOM
spring.shardingsphere.rules.readwrite-splitting.load-balancers.alg_weight.type=WEIGHT
spring.shardingsphere.rules.readwrite-splitting.load-balancers.alg_weight.props.slave1=1
spring.shardingsphere.rules.readwrite-splitting.load-balancers.alg_weight.props.slave2=2

# 打印SQl
spring.shardingsphere.props.sql-show=true

# mybatis plus 配置
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.type-aliases-package=com.gaogzhen.shardingjdbcdemo.entity

• myds为自定义的逻辑数据源名称
• 当前生效的负载均衡算法为轮询，可以通过更换负载均衡算法名称，来测试随机和权重。

2、测试

2.1、读写分离测试

package com.gaogzhen.shardingjdbcdemo;

import com.gaogzhen.shardingjdbcdemo.entity.User;
import com.gaogzhen.shardingjdbcdemo.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.List;

@SpringBootTest
public class ReadWriteTest {

    @Resource
    private UserMapper userMapper;


     /**
      * 读写分离：写入数据的测试
      */
     @Test
     public void testInsert(){

         User user = new User();
         user.setName("张三");
         userMapper.insert(user);
         
         User user1 = userMapper.selectById(1L);
     }

}

2.2、事务测试

为了保证主从库间的事务一致性，避免跨服务的分布式事务，ShardingSphere-JDBC的主从模型中，事务中的数据读写均用主库。

• 不添加@Transactional：insert对主库操作，select对从库操作
• 添加@Transactional：则insert和select均对主库操作
• **注意：**在JUnit环境下的@Transactional注解，默认情况下就会对事务进行回滚（即使在没加注解@Rollback，也会对事务回滚）

 /**
  * 事务测试
  */
 @Transactional
 @Test
 public void testTrans() {
     User user = new User();
     user.setName("xxx001");
     userMapper.insert(user);

     List<User> users = userMapper.selectList(null);

 }

2.3、负载均衡测试

/**
 * 负载均衡测试
 */
@Test
public void testLoadBalance() {
    List<User> users1 = userMapper.selectList(null);
    List<User> users2 = userMapper.selectList(null);

}

也可以在web请求中测试负载均衡

package com.gaogzhen.shardingjdbcdemo.controller;

import com.gaogzhen.shardingjdbcdemo.entity.User;
import com.gaogzhen.shardingjdbcdemo.service.UserService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    @Resource
    private UserService userService;

    /**
     * 测试负载均衡策略
     */
    @GetMapping("selectAll")
    public void selectAll(){
        List<User> users = userService.list();
        users.forEach(System.out::println);
    }
}

命令行测试结果如下图所示：

结语

如果小伙伴什么问题或者指教，欢迎交流。

QQ:806797785

仓库源代码地址：https://github.com/gaogzhen/shardingsphere-jdbc-demo.git

参考链接:

[1]ShardingSphere5实战教程[CP/OL].2022-09-14.p18-23.

[2]mysql官网使用配置文件文档[CP/OL].文章来源地址https://www.toymoban.com/news/detail-665246.html

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