dynamic-datasource + Greenplum + MySQL 多数据源配置

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>3.1.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>8.0.18</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.5.1</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.2</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
            <optional>true</optional>
        </dependency>

        <!--阿里数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.14</version>
        </dependency>
    </dependencies>

配置文件

spring:
  autoconfigure:
    # 排除 Druid 自动配置
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
  datasource:
    dynamic:
      # 设置默认的数据源或者数据源组,默认值即为master
      primary: mysql
      # 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
      strict: false
      datasource:
        mysql:
          driverClassName: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://localhsot:3306/acquisition?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
          username: program
          password: z#Mshkk5
        greenplum:
          driverClassName: org.postgresql.Driver
          url: jdbc:postgresql://localhsot:5432/scada
          username: gpadmin
          password: 123456

mybatis-plus:
  mapper-locations: classpath:/mapper/**/*Mapper.xml
  typeAliasesPackage: com.yang.**.entity
  configuration:
    mapUnderscoreToCamelCase: true
  global-config:
    db-config:
      db-column-underline: true

应用代码

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QL

@Service
@DS("greenplum")
public class ScadaDataServiceImpl extends ServiceImpl<ScadaDataMapper, ScadaData> implements ScadaDataService {

    @Override
    public List<ScadaData> pageQuery() {
        List<String> code = baseMapper.getDeviceCode();
        code.forEach(System.out::println);

        String deviceCode = "D202210180064";
        return list(Wrappers.<ScadaData>lambdaQuery()
                .eq(ScadaData::getDeviceCode, deviceCode));
    }
}

@Mapper
public interface ScadaDataMapper extends BaseMapper<ScadaData> {

    List<String> getDeviceCode();
}

<?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="com.yang.mapper.ScadaDataMapper">

    <select id="getDeviceCode" resultType="java.lang.String">
        SELECT
            DISTINCT
            device_code
        FROM t_scada_data
    </select>
</mapper>

@Service
public class AlarmActionServiceImpl extends ServiceImpl<AlarmActionMapper, AlarmAction> implements AlarmActionService {

    private final ScadaDataService scadaDataService;

    @Autowired
    public AlarmActionServiceImpl(ScadaDataService scadaDataService) {
        this.scadaDataService = scadaDataService;
    }

    @Override
    public void getData() {
        List<ScadaData> scadaData = scadaDataService.pageQuery();
        List<AlarmAction> list = list();

        System.out.println(list.size());
        System.out.println(scadaData.size());
    }
}

@DS注解失效常见问题

关于事务：Mybatis plus的多数据源@DS切换为什么不起作用了，谁的锅，@Transactional_zmyHow的博客-CSDN博客_mybatisplus@ds导致事务失败

Shiro框架：@DS数据源未匹配成功,不管如何设置都是使用默认的primary的库 · Issue #44 · baomidou/dynamic-datasource-spring-boot-starter · GitHub

mybatis-plus 多数据源无效问题(springboot + shiro)_容@易的博客-CSDN博客_basemapper 数据源不生效

官方参考文档：

多数据源 | MyBatis-Plus