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1.mybatis-plus 版本

<dependency>
  <groupId>com.github.jeffreyning</groupId>
  <artifactId>mybatisplus-plus</artifactId>
  <version>1.5.1-RELEASE</version>
</dependency>
<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus-boot-starter</artifactId>
  <version>3.1.0</version>
</dependency>
<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus-generator</artifactId>
  <version>3.1.0</version>
</dependency>

2.实体类

@TableName("etl_job")
public class Job implements Serializable {

  private static final long serialVersionUID=1L;

  @MppMultiId // 复合主键
  private String etlSystem;

  @MppMultiId // 复合主键
  private String etlJob;
}

3.Mapper类和mapper.xml

public interface JobMapper extends MppBaseMapper<Job> {

}

<resultMap id="BaseResultMap" type="com.dd.study.beans.Job">
    <id column="etl_system" property="etlSystem" />
    <id column="etl_job" property="etlJob" />
</resultMap>

4.Server和ServiceImpl

public interface JobService extends IMppService<Job> {
}

@Service
public class JobServiceImpl extends MppServiceImpl<JobMapper, Job> implements JobService {
}

5.接下来就是正式应用复合主键相关的操作了

jobService.saveOrUpdateByMultiId(job);

6.想要启动复合主键，还要记得在启动类加上@EnableMPP。

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