关于MySQL主从搭建，可以参考我的文章学习docker第五天之MySQL主从复制搭建_Husky_jzq的博客-程序员宅基地

首先导入相关的pom依赖

<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>5.1.0</version>
        </dependency>


        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.22</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </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>

导入依赖后配置shardingsphere-jdbc的yml文件

spring:
  shardingsphere:
    # 数据源配置
    datasource:
      # 数据源名称，多数据源以逗号分隔
      names: master,slave
      master:
        # 数据库连接池类名称
        type: com.zaxxer.hikari.HikariDataSource
        # 数据库驱动类名
        driver-class-name: com.mysql.cj.jdbc.Driver
        jdbc-url: jdbc:mysql://ip:端口/数据库?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
      slave:
        # 数据库连接池类名称
        type: com.zaxxer.hikari.HikariDataSource
        # 数据库驱动类名
        driver-class-name: com.mysql.cj.jdbc.Driver
        jdbc-url: jdbc:mysql://ip:端口/数据库?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
    # 规则配置
    rules:
      readwrite-splitting:
        load-balancers:
          ms:
            type: ROUND_ROBIN
            props:
              workId: 1
        data-sources:
          ms:
            type: Static
            load-balancer-name: round-robin
            props:
              write-data-source-name: master
              read-data-source-names: slave
    # 属性配置
    props:
      # 展示修改以后的sql语句
      sql-show: true
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

然后测试读写情况，读是在slave，写是在master

 

 至此，读写分离集成成功!

笔者此次读写分离是一主一从，既然读写分离就涉及事务问题。在配置成功后发现使用事务失败@Transactional。基于之前项目配置过一次双数据源和本次读写分离的形式，笔者认为，既然是一主一从，按理说只需要指定主库进行事务即可（因为从库会同步主库）。所以在进行相关查阅后，进行事务管理器的配置，指定@Transactional的事务为主库事务即可。相关配置如下：

 

 进过测试，事务成功

 主库数据

 从库数据