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在MYSQL我有這個疑問:
如何在JPA-Hibernate中執行透視查詢?
我的表
planning ------------------- process_id (int) project_id (int) period (datetime) total_hour (double)
SELECT process_id, project_id, sum(if (period="2013-04-01 00:00:00",total_hour,0)) as april, sum(if (period="2013-05-01 00:00:00",total_hour,0)) as may, sum(if (period="2013-06-01 00:00:00",total_hour,0)) as june FROM planning GROUP BY process_id,project_id;
我需要轉換這個clausule SQL在JPA使用?
如何添加結果設置爲新的對象(例如: PlanningExtractBean.class),因爲源Bean與結果集不同。 –
我更新了答案。 – willome
謝謝。這個例子對我的系統是正確的。 –