这篇文章主要介绍“如何用springboot+mybatis+Sharding jdbc实现的分库分表、读写分离”，在日常操作中，相信很多人在如何用springboot+mybatis+Sharding jdbc实现的分库分表、读写分离问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何用springboot+mybatis+Sharding jdbc实现的分库分表、读写分离”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

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项目搭建

1、新建一个spring boot工程，添加依赖

    
        
        
            top.qrainly
            bj_core
            0.0.1-SNAPSHOT
        
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.2
        
        
        
            com.alibaba
            druid-spring-boot-starter
            1.1.10
        
        
        
            io.shardingsphere
            sharding-jdbc-spring-boot-starter
            3.1.0.M1
        
        
        
            com.github.jsonzou
            jmockdata
            4.1.2
        
    

这里友情推荐一下，依赖里用到了朋友开源的一个工具插件JMockData，此乃开发测试之利器，强烈推荐！！！

2、在master库执行sql脚本，创建用户表

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(12) NOT NULL AUTO_INCREMENT,
  `username` varchar(12) NOT NULL,
  `password` varchar(30) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_0`;
CREATE TABLE `user_0` (
  `id` int(12) NOT NULL AUTO_INCREMENT,
  `username` varchar(12) NOT NULL,
  `password` varchar(30) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_1`;
CREATE TABLE `user_1` (
  `id` int(12) NOT NULL AUTO_INCREMENT,
  `username` varchar(12) NOT NULL,
  `password` varchar(30) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_2`;
CREATE TABLE `user_2` (
  `id` int(12) NOT NULL AUTO_INCREMENT,
  `username` varchar(12) NOT NULL,
  `password` varchar(30) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_3`;
CREATE TABLE `user_3` (
  `id` int(12) NOT NULL AUTO_INCREMENT,
  `username` varchar(12) NOT NULL,
  `password` varchar(30) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_4`;
CREATE TABLE `user_4` (
  `id` INT(12) NOT NULL AUTO_INCREMENT,
  `username` VARCHAR(12) NOT NULL,
  `password` VARCHAR(30) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `idx-username` (`username`)
) ENGINE=INNODB DEFAULT CHARSET=utf8;

配置主从复制的内容请参考windows上MySQL的主从配置

3、配置生成dao/domain文件mybatis-generator配置

4、提供一个查询和添加的接口

controller

/**
 * @author v_liuwen
 * @date 2019-07-10
 */
@RestController
@RequestMapping(value = "/user")
@Slf4j
public class UserController {

    @Autowired
    private IUserService iUserService;

    @GetMapping("/list")
    public JsonResult> list() {
        List userList = iUserService.findUserList();
        return JsonResult.okJsonResultWithData(userList);
    }

    @GetMapping("/add")
    public JsonResult add(@RequestParam(name = "user",required = false) User user) {
        log.info("新增用户信息-->{}", JSONObject.toJSONString(user));
        boolean result = iUserService.addUser();
        return JsonResult.okJsonResultWithData(result);
    }

    @GetMapping("/batchAdd")
    public JsonResult batchAdd() {
        boolean result = iUserService.batchAddUser();
        return JsonResult.okJsonResultWithData(result);
    }
}

service

/**
 * @author v_liuwen
 * @date 2019-07-10
 */
@Service
@Slf4j
public class IUserServiceImpl implements IUserService {

    private AtomicInteger num = new AtomicInteger(1);

    @Resource
    private UserDAO userDAO;

    @Override
    public boolean addUser() {
        User user = JMockData.mock(User.class);
        int i = userDAO.insertSelective(user);
        if(i == 1){
            return true;
        }
        return false;
    }

    @Override
    public List findUserList() {
        List userList = userDAO.findUserList();
        return userList;
    }

    @Override
    public boolean batchAddUser() {
        try{
            for (int i =100;i<150;i++){
                User user = JMockData.mock(User.class);
                user.setId(num.getAndIncrement());
                userDAO.insertSelective(user);
            }
            return true;
        }catch (Exception e){
            log.error("批量插入失败  失败原因-->{}",e.getMessage());
            return false;
        }
    }
}

5、配置文件(重点在这里)

基础配置-->application.yml

server:
  port: 8018

spring:
  application:
    name: bj-sharding-jdbc
  main:
    allow-bean-definition-overriding: true
  profiles:
    # rw-读写分离配置  table-数据分表+读写分离   dt-分库分表+读写分离
    active: dt
mybatis:
  mapper-locations: classpath:/top/qrainly/**/dao/**/*.xml

读写分离配置-->application-rw.yml

sharding:
  jdbc:
    dataSource:
      names: db-test0,db-test1
      db-test0:
        type: com.alibaba.druid.pool.DruidDataSource
        driverClassName: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/bj_sharding?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
        username: root
        password: 123456
        maxPoolSize: 20
      db-test1:
        type: com.alibaba.druid.pool.DruidDataSource
        driverClassName: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3307/bj_sharding?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
        username: root
        password: 123456
        maxPoolSize: 20
    config:
        # 仅配置读写分离时打开此配置
      masterslave:
        # 配置从库选择策略，提供轮询与随机，这里选择用轮询//random 随机 //round_robin 轮询
        load-balance-algorithm-type: round_robin
        name: db1s2
        master-data-source-name: db-test0
        slave-data-source-names: db-test1
    props:
      sql:
        # 开启SQL显示，默认值: false，注意：仅配置读写分离时不会打印日志！！！
        show: true

数据分表+读写分离配置-->application-table.yml

sharding:
  jdbc:
    dataSource:
      names: db-test0,db-test1
      db-test0:
        type: com.alibaba.druid.pool.DruidDataSource
        driverClassName: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/bj_sharding?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
        username: root
        password: 123456
        maxPoolSize: 20
      db-test1:
        type: com.alibaba.druid.pool.DruidDataSource
        driverClassName: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3307/bj_sharding?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
        username: root
        password: 123456
        maxPoolSize: 20
    config:
      # 配置数据分表
      sharding:
        tables:
          user:
            table-strategy:
              standard:
                sharding-column: id
                precise-algorithm-class-name: top.qrainly.sharding.jdbc.config.MyPreciseShardingAlgorithm
            # 读取ds_0数据源的user_0、user_1、user_2、user_3
            actual-data-nodes: ds_0.user_$->{0..3}
        master-slave-rules:
          ds_0:
            master-data-source-name: db-test0
            slave-data-source-names: db-test1
    props:
      sql:
        # 开启SQL显示，默认值: false，注意：仅配置读写分离时不会打印日志！！！
        show: true

分库分表+读写分离配置-->application-dt.yml

---
sharding:
  jdbc:
    datasource:
      names: ds-master-0,ds-master-1,ds-master-0-slave-0,ds-master-1-slave-0
      # 主库0
      ds-master-0:
        password: 123456
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/bj_sharding?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
        username: root
      # 主库0-从库0
      ds-master-0-slave-0:
        password: 123456
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3307/bj_sharding?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
        username: root
      # 主库1
      ds-master-1:
        password: 123456
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/bj_sharding1?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
        username: root
      # 主库1-从库0
      ds-master-1-slave-0:
        password: 123456
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3307/bj_sharding1?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
        username: root
    config:
      sharding:
        tables:
          user:
            table-strategy:
              inline:
                sharding-column: id
                algorithm-expression: user_$->{id % 5}
            key-generator-column-name: id
            actual-data-nodes: ds_$->{0..1}.user_$->{0..4}
        default-database-strategy:
          inline:
            # 置的分库的字段，本案例是根据id进行分
            sharding-column: id
            # 置的分库的逻辑，根据id%2进行分
            algorithm-expression: ds_$->{id % 2}
        master-slave-rules:
          ds_1:
            slave-data-source-names: ds-master-1-slave-0
            master-data-source-name: ds-master-1
          ds_0:
            slave-data-source-names: ds-master-0-slave-0
            master-data-source-name: ds-master-0

注：分库分表配置下需要在@SpringBootApplication上添加参数exclude={DataSourceAutoConfiguration.class}

ok，切换spring.profiles.active在不同配置模式下耍吧！

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