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在 Spring Boot整合MyBatis配置多数据源 文章中，展示了Spring Boot整合Mybatis配置多数据源的方法。那么，如果使用MyBatis Plus，如何配置多数据源呢？

官方文档：https://baomidou.com/pages/a61e1b/

MyBatis Plus连接数据库参考：Spring Boot整合MyBatis Plus连接数据库

0 开发环境

• JDK：1.8

• Spring Boot：2.1.1.RELEASE

• MySQL：5.7.13

1 引入依赖

<dependency>  <groupId>com.baomidou</groupId>  <artifactId>mybatis-plus-boot-starter</artifactId>  <version>3.5.4</version></dependency><dependency>  <groupId>mysql</groupId>  <artifactId>mysql-connector-java</artifactId>  <scope>runtime</scope></dependency><dependency>  <groupId>com.baomidou</groupId>  <artifactId>dynamic-datasource-spring-boot-starter</artifactId>  <version>3.5.2</version></dependency><dependency>  <groupId>org.projectlombok</groupId>  <artifactId>lombok</artifactId>  <version>1.18.30</version>  <scope>provided</scope></dependency>

2 配置数据源

server:  port: 8090spring:  datasource:   dynamic:    primary: master    #设置默认的数据源或者数据源组，默认值即为master    strict: false     #严格匹配数据源，默认false。true未匹配到指定数据源时抛异常，false使用默认数据源    datasource:     master:      url: jdbc:mysql://127.0.0.1:3306/test_master?characterEncoding=utf8&serverTimezone=GMT%2B8      username: root      password: root      driver-class-name: com.mysql.cj.jdbc.Driver   #3.2.0开始支持SPI可省略此配置     slave:      url: jdbc:mysql://127.0.0.1:3306/test_slave?characterEncoding=utf8&serverTimezone=GMT%2B8      username: root      password: root      driver-class-name: com.mysql.cj.jdbc.Driver#mybatis-plus:  mapper-locations: classpath:mapper/*.xml  type-aliases-package: cn.wbnull.springbootdemo.entity

3 使用@DS切换数据源

@DS 可以注解在方法上或类上，同时存在就近原则 方法上注解 优先于 类上注解。

注解	结果
没有@DS	默认数据源
@DS("dsName")	dsName可以为组名也可以为具体某个库的名称

@DS("slave")@Servicepublic class UserInfoService {  @Autowired  private UserInfoMapper userInfoMapper;  public List<UserInfo> query() {    LambdaQueryWrapper<UserInfo> queryWrapper = new LambdaQueryWrapper<>();    return userInfoMapper.selectList(queryWrapper);   }}

4 测试

直接使用 Spring Boot整合MyBatis配置多数据源 中创建的数据库表

4.1 新建实体类

@Datapublic class User implements Serializable {  private static final long serialVersionUID = 1L;  @TableId(value = "id", type = IdType.AUTO)  private int id;  private String name;}

@Datapublic class UserInfo implements Serializable {  private static final long serialVersionUID = 1L;  @TableId(value = "id", type = IdType.AUTO)  private Integer id;  @TableField("userCode")  private String userCode;  @TableField("userName")  private String userName;  private String password;}

注：这里因为数据库里字段是驼峰式命名，所以使用 @TableField 指定对应的数据库字段名，也可以通过yml配置关闭属性映射

mybatis-plus:  mapper-locations: classpath:mapper/*.xml  type-aliases-package: cn.wbnull.springbootdemo.entity  configuration:   map-underscore-to-camel-case: false

4.2 新建Mapper

@Repositorypublic interface UserMapper extends BaseMapper<User> {}

@Repositorypublic interface UserInfoMapper extends BaseMapper<UserInfo> {}

4.3 新建映射文件

<?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="cn.wbnull.springbootdemo.mapper.UserMapper">  <!-- 通用查询映射结果 -->  <resultMap id="BaseResultMap" type="cn.wbnull.springbootdemo.entity.User">    <id column="id" property="id"/>    <result column="name" property="name"/>  </resultMap>  <!-- 通用查询结果列 -->  <sql id="Base_Column_List">     id, name  </sql></mapper>

<?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="cn.wbnull.springbootdemo.mapper.UserInfoMapper">  <!-- 通用查询映射结果 -->  <resultMap id="BaseResultMap" type="cn.wbnull.springbootdemo.entity.UserInfo">    <id column="id" property="id"/>    <result column="userCode" property="userCode"/>    <result column="userName" property="userName"/>    <result column="password" property="password"/>  </resultMap>  <!-- 通用查询结果列 -->  <sql id="Base_Column_List">     id, userCode, userName, password  </sql></mapper>

4.4 新建Service

@Servicepublic class UserService {  @Autowired  private UserMapper userMapper;  public List<User> query() {    LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();    return userMapper.selectList(queryWrapper);   }}

/** * 3使用@DS切换数据源 中已展示过该类 */@DS("slave")@Servicepublic class UserInfoService {  @Autowired  private UserInfoMapper userInfoMapper;  public List<UserInfo> query() {    LambdaQueryWrapper<UserInfo> queryWrapper = new LambdaQueryWrapper<>();    return userInfoMapper.selectList(queryWrapper);   }}

4.5 新建Controller

@RestController@RequestMapping("user")public class UserController {  @Autowired  public UserService userService;  @PostMapping(value = "query")  public List<User> query() {    return userService.query();   }}

@RestController@RequestMapping("userInfo")public class UserInfoController {  @Autowired  public UserInfoService userInfoService;  @PostMapping(value = "query")  public List<UserInfo> query() {    return userInfoService.query();   }}

4.6 测试

使用Postman测试，输出结果如下

4.6.1 master select

4.6.2 slave select

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CSDN：https://blog.csdn.net/dkbnull/article/details/136611367

知乎：https://zhuanlan.zhihu.com/p/686275755

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