一、新增POM引用

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>MySQL-Test</artifactId>
        <groupId>org.example</groupId>
        <version>1.0
 
-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>MasterSlave</artifactId>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.1
 
.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>
        <!--mybatis驅動-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0
 
.17</version>
        </dependency>
        <!--druid資料來源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.16</version>
        </dependency>
        <!--shardingsphere最新版本-->
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>4.0.0-RC1</version>
        </dependency>
        <!--lombok實體工具-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--swagger2-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.8.0</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.8.0</version>
        </dependency>
    </dependencies>

</project>

二、配置連線屬性

server.port=8088
#指定mybatis資訊
#mybatis.config-location=classpath:mybatis-config.xml
mybatis.type-aliases-package="com.test.mapper"

spring.shardingsphere.datasource.names=master,slave0
# 資料來源 主庫
spring.shardingsphere.datasource.master.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.master.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.master.url=jdbc:mysql://192.168.187.128:33066/masterDB?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT
spring.shardingsphere.datasource.master.username=root
spring.shardingsphere.datasource.master.password=123456
# 資料來源 從庫
spring.shardingsphere.datasource.slave0.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.slave0.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.slave0.url=jdbc:mysql://192.168.187.128:33065/masterDB?characterEncoding=utf-8
spring.shardingsphere.datasource.slave0.username=root
spring.shardingsphere.datasource.slave0.password=123456

# 讀寫分離
spring.shardingsphere.masterslave.load-balance-algorithm-type=round_robin
spring.shardingsphere.masterslave.name=ms
spring.shardingsphere.masterslave.master-data-source-name=master
spring.shardingsphere.masterslave.slave-data-source-names=slave0
#列印sql
spring.shardingsphere.props.sql.show=true

三、程式碼

1、Application程式碼

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@SpringBootApplication
@EnableAutoConfiguration(exclude = {DruidDataSourceAutoConfigure.class})
@EnableSwagger2
public class Application {
    public static void main(String[] args){
        SpringApplication.run(Application.class, args);
    }
}

2、Mapper程式碼

import com.test.model.User;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface UserMapper {
    @Insert("INSERT INTO `user` (`id`,`name`, `age`) VALUES (#{user.id},#{user.name}, #{user.age});")
    public Boolean insert(@Param("user") User user);
    @Select("select * from user")
    public List<User> getAll();
    @Update("update user set name=#{user.name},age=#{user.age} where id=#{user.id};")
    void update(@Param("user") User user);
}

3、controller程式碼

import com.test.mapper.UserMapper;
import com.test.model.User;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.Date;
import java.util.List;


@Api(value = "UserController")
@RestController
public class UserController {
    @Autowired
    UserMapper userMapper;

    @ApiOperation(value = "插入資料", notes = "")
    @PostMapping("/insert")
    public String insert() {
        User user=new User();
        user.setName("小明"+new Date().toString());
        user.setAge(11);
        userMapper.insert(user);
        return "插入資料成功";
    }

    @ApiOperation(value = "插入資料", notes = "")
    @PostMapping("/insert1")
    public String insert1(@ApiParam(value = "使用者", required = true)User user) {
        userMapper.insert(user);
        return "插入資料成功";
    }

    @ApiOperation(value = "插入資料", notes = "")
    @GetMapping("/update")
    public String update(@ApiParam(value = "使用者", required = true)User user) {
        userMapper.update(user);
        return "插入資料成功";
    }

    @ApiOperation(value = "分頁查詢", notes = "")
    @GetMapping(value="/page")
    public List<User> page(@RequestParam(value = "第幾頁", required = true) Integer pageIndex,
                               @RequestParam(value = "每頁資料量", required = true) Integer pageSize) {
        List<User> list=userMapper.getAll();
        return list;
    }

    @ApiOperation(value = "查詢所有", notes = "")
    @GetMapping(value="/getAll")
    public List<User> getAll() {
        List<User> list=userMapper.getAll();
        return list;
    }
}

四、主從資料庫部署

見博文：docker-compose安裝mysql主從叢集