SpringBoot multiple data sources solutions (reprint)

　　　　1, open-source project Address: MyBatis Plus  &  Dynamic Datasource

　　　　Maven configuration:

 <dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.0.6</version>
 </dependency>
 <dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
    <version>2.4.2</version>
 </dependency>

　　      Profile Description:

Server: 
  Port: 2080 
logging: 
  Level: 
    cn.mrxionge.bootdemo: Debug 
    org.springframework.web: Debug 
    org.springframework.data: Debug 
the mybatis - PLUS: 
  Executor - of the type: the Simple 
the Spring: 
  the DataSource: 
    # Configure connection pool hikari 
    hikari: 
      Minimum -idle: . 4 
      maximum -pool-size: 16 
      Connection -timeout: 10000 
      IDLE -timeout: 30000 
      Connection -init-SQL: SET names utf8mb4 
    # dynamic data source configuration
    dynamic:
      #主数据源
      primary: a01
      datasource:
        #数据源a01
        a01:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://127.0.0.1:3306/a01?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai
          username: root
          password: 123456
        #数据源a02
        a02:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://127.0.0.1:3306/a02?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai
          username: root
          password: 123456
        #数据源a03
        a03:
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://127.0.0.1:3306/a03?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai
          username: root
          password: 123456

　　Test: New mapper three different files, each file corresponding to a data mapper source, by calling the different mapper file for query data from different databases

　　　　   Mapper example:　　　

@DS(value = "a01")
@Mapper
public interface MapperA01 extends BaseMapper<UserInfo> {
    @Select("SELECT * FROM user_info")
    List<UserInfo> getAllUser();
}

@DS(value = "a02")
@Mapper
public interface MapperA02 extends BaseMapper<UserInfo> {
    @Select("SELECT * FROM user_info")
    List<UserInfo> getAllUser();
}

@DS(value = "a03")
@Mapper
public interface MapperA03 extends BaseMapper<UserInfo> {
    @Select("SELECT * FROM user_info")
    List<UserInfo> getAllUser();
}

　　　Service Example:

　　　　

@Service
 public  class the AppService { 

    @Autowired 
    Private MapperA01 mapperA01; 

    @Autowired 
    Private MapperA02 mapperA02; 

    @Autowired 
    Private MapperA03 mapperA03; 

    / * * 
     * A01 query data repository 
     * 
     * @return list of user information 
     * / 
    List <the UserInfo> getUser01 () {
         return mapperA01.getAllUser (); 
    } 

    / * * 
     * A02 query data repository 
     * 
     * @return list of user information 
     * / 
    list <the UserInfo> getUser02 () {
         returnmapperA02.getAllUser (); 
    } 

    / * * 
     * A03 query data repository 
     * 
     * @return list of user information 
     * / 
    List <the UserInfo> getUser03 () {
         return mapperA03.getAllUser (); 
    } 
}

　　　Controller Example:

@RestController
public class AppHandler {

    @Autowired
    private AppService service;

    @GetMapping(path = "/get01")
    public Mono get01() {
        //查询A01数据
        return Mono.fromSupplier(service::getUser01);
    }

    @GetMapping(path = "/get02")
    public Mono get02() {
        //查询A02数据
        return Mono.fromSupplier(service::getUser02);
    }

    @GetMapping(path = "/get03" )
     Public Mono get03 () {
         // query data A03 
        return Mono.fromSupplier (:: getUser03-Service); 
    } 
}

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Original link: https: //blog.csdn.net/qq_31226223/article/details/85322561