用數據庫結果對象映射一個視圖

Question

我試圖用Spring JPA中查詢Postgres DB後得到的resultset對象來映射視圖。 但我不知道該怎麼做，任何幫助將不勝感激

@Query(nativeQuery = true, value = "select e.job_number, p.tag_number, e.drawing_number, p.part_number, " 
      + "eoa.operation_order, peoa.name, peoa.status, peoa.comment, peoa.last_updated_by, " 
      + "peoa.last_updated_date, peoa.revtype " 
      + "from brs.events e " 
      + "join brs.parts p on e.id = p.event_id " 
      + "join brs.event_operations_audit eoa on eoa.event_id = e.id " 
      + "join brs.part_event_operations_audit peoa on peoa.part_id = p.id and peoa.event_operation_id = eoa.id " 
      + "where e.id = :eventId " 
      + "and e.is_received = true " 
      + "and e.is_workscope_reviewed = true " 
      + "order by p.tag_number, eoa.operation_order, peoa.last_updated_date ") 
    Set<Object> getJobPartRecentActivityData(@Param("eventId")Long eventId); 

https://pastebin.com/iDZDhpce

Answer 1

這樣就可以實現通過下面的例子。 創建一個類說BookValueMappig

@SqlResultSetMapping(
     name = "BookValueMapping", 
     classes = @ConstructorResult(
       targetClass = BookValue.class, 
       columns = { 
        @ColumnResult(name = "id", type = Long.class), 
        @ColumnResult(name = "title"), 
        @ColumnResult(name = "version", type = Long.class), 
        @ColumnResult(name = "authorName")})) 

然後在JPA包括映射文件：

List<BookValue> results = this.em.createNativeQuery("SELECT b.id, b.title, b.version, a.firstName || a.lastName as authorName FROM Book b JOIN Author a ON b.author_id = a.id", "BookValueMapping").getResultList();