SpringBoot整合Mybatis-plus多数据源

SpringBoot整合Mybatis-plus多数据源 背景说明：在项目中需要访问多个数据库的时候，我们该怎么办呢？下面我介绍一个极其方便的动态切换数据源的方法。 pom.xml

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.6.5
         
    
    com.example
    demo-spring-mybatisplus
    0.0.1-SNAPSHOT
    demo-spring-mybatisplus
    Demo project for Spring Boot
    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        

        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.5.1
        

        
        
            com.baomidou
            dynamic-datasource-spring-boot-starter
            3.3.2
        
        
            mysql
            mysql-connector-java
            8.0.21
        

        
        
            com.alibaba
            druid-spring-boot-starter
            1.2.8
        

        
        
            org.projectlombok
            lombok
            1.18.16
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

application.yml

spring:
  autoconfigure:
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
  datasource:
    dynamic:
      primary: mysql1 #设置默认数据库源
      strict: false #严格匹配数据源，默认为false，true未匹配到指定数据库时抛异常，false使用默认数据源
      datasource:
        mysql1:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://localhost:3306/demo_mybatisplus?serverTimezone=UTC
          username: root
          password: root
        mysql2:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://localhost:3306/demo_mybatisplus2?serverTimezone=UTC
          username: root
          password: root

com.example.demospringmybatisplus.pojo

@Data
@NoArgsConstructor //生成无参构造函数
@AllArgsConstructor //生成全参数构造函数
@ToString
@TableName(value = "user") //指定查询的表名为user
public class User {
    // 以下为 mybatis-plus测试
    private Integer id;
    private String name;
    private String password;
    private String sex;
    private Date createTime;
    private Date updateTime;
}

@Data
@NoArgsConstructor //生成无参构造函数
@AllArgsConstructor //生成全参数构造函数
@ToString
@TableName(value = "user") //指定查询的表名为user
public class User2 {
    // 以下为 mybatis-plus测试
    private Integer id;
    private String name;
    private String password;
    private String email;
}

com.example.demospringmybatisplus.mapper

@DS("mysql1")
@Repository("UserMapper")
public interface UserMapper extends baseMapper {
}

@DS("mysql2")
@Repository("User2Mapper")
public interface User2Mapper extends baseMapper {
}

项目启动类：DemoSpringMybatisplusApplication

@MapperScan("com.example.demospringmybatisplus.mapper")
@SpringBootApplication
public class DemoSpringMybatisplusApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoSpringMybatisplusApplication.class, args);
    }
}

项目测试类：DemoSpringMybatisplusApplicationTests

@SpringBootTest
class DemoSpringMybatisplusApplicationTests {
    @Autowired
    UserMapper userMapper;
    @Autowired
    User2Mapper user2Mapper;
    @Test
    void contextLoads() {
        User user = userMapper.selectById(1);
        System.out.println(user.toString());
        User2 user2 = user2Mapper.selectById(1);
        System.out.println(user2.toString());
    }
}

项目运行截图（DemoSpringMybatisplusApplicationTests启动）：

项目已经上传到 GitHub 和 Gitee GitHub：demo-spring-mybatisplus Gitee：demo-spring-mybatisplus