步骤1:在com.bstek.dorado.sample.standardlesson.service包中新建MessageService.java,代码如下:
package com.bstek.dorado.sample.standardlesson.service; import java.util.Collection; import javax.annotation.Resource; import org.springframework.stereotype.Component; import org.springframework.transaction.annotation.Transactional; import com.bstek.dorado.annotation.DataResolver; import com.bstek.dorado.sample.standardlesson.dao.SlMessageDao; import com.bstek.dorado.sample.standardlesson.entity.SlEmployee; import com.bstek.dorado.sample.standardlesson.entity.SlMessage; @Component public class MessageService { @Resource private SlMessageDao slMessageDao; @DataResolver @Transactional public void saveMessages(Collection<SlEmployee> slEmployees){ for(SlEmployee employee:slEmployees){ Collection<SlMessage> messages = employee.getSlMessageSet(); for(SlMessage message:messages){ //维护关联关系 message.setSlEmployee(employee); } slMessageDao.persistEntities(messages); } } }
在此方法我们可以看到通过UpdateAction将slEmployees集合对象传递到后台,然后我们遍历集合从员工对象中取得消息集合,然后持久化消息。另外要注意因为JPA映射配置时主从关系的原因,我们需要维护员工和消息的关联关系。