需求：springboot后台需要访问其他数据库的数据，同时操作多个数据库的数据。

pom.xml文件配置：

<dependency>
	<groupId>com.baomidou</groupId>
	<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
	<version>3.5.1</version>
</dependency>

application.yml配置：

# 注意这里前面的空格很重要，否则不起作用
spring:

  datasource:
    dynamic:
      primary: aaa
      strict: false
      initialization-mode: always
      aaa:
        longi:
          url: jdbc:mysql:urla
          username: root
          password: aaaa
          driver-class-name: com.mysql.cj.jdbc.Driver
          hikari:
            connection-timeout: 30000      # 连接超时时间，默认30秒
            idle-timeout: 600000           # 连接空闲超时时间
            max-lifetime: 120000          # 连接最大存活时间，30分钟
        bbb:
          url: jdbc:urlb
          username: root
          password: bbbb
          driver-class-name: com.mysql.cj.jdbc.Driver
          hikari:
            connection-timeout: 30000      # 连接超时时间，默认30秒
            idle-timeout: 600000           # 连接空闲超时时间
            max-lifetime: 120000          # 连接最大存活时间，30分钟
        ccc:
          url: jdbc:urlc
          username: root
          password: cccc
          driver-class-name: com.mysql.cj.jdbc.Driver
          hikari:
            connection-timeout: 30000      # 连接超时时间，默认30秒
            idle-timeout: 600000           # 连接空闲超时时间
            max-lifetime: 120000          # 连接最大存活时间，30分钟

mapper文件代码:

@DS("aaa")
@Mapper
public interface DeviceMapper {

    @Select("select * from ${tableName} where type = #{type};")
    List<DeviceStatus> getDeviceStatusByType(String tableName, String type);
}

service文件代码：

@Service
public class UserService {
    @Autowired
    AAAMapper aaarMapper;
    @Autowired
    BBBMapper bbbMapper;
    @Autowired
    CCCMapper cccMapper;

    public Object SelectUser(String phone)
    {
        AAAUser aaaUser = aaarMapper.SelectUser(phone);
        if (aaaUser != null)
            return aaaUser ;
        BBBUser bbbUser = bbbMapper.SelectUser(phone);
        if (bbbUser != null)
            return bbbUser ;
        CCCUser cccUser = cccMapper.SelectUser(phone);
        if (cccUser != null)
            return cccUser ;
        return null;
    }
}

效果：