jOOQ返回一個POJO和來自已加入表的ID

我有一個WARNINGS_HISTORY表，它是一個事件列表，每個事件都鏈接到一個包含事件詳細信息的WARNINGS行。我已經能夠檢索出現在特定時間範圍內的警告列表（List<Warnings>）。但我也需要WARNINGS_HISTORY.ID。所以我需要下面的SQL返回類似於Map<Integer, Warnings>,List<List<Integer, Warnings>>或List<List<WarningsHistory, Warnings>>其中Integer字段是WARNINGS_HISTORY.ID。jOOQ返回一個POJO和來自已加入表的ID

有關如何實現此目的的任何提示？

public List<Warnings> load(int maxId, LocalDateTime timestampStart,LocalDateTime timestampEnd) { 
    return create.select(WARNINGS.fields()) 
      .from(WARNINGS_HISTORY) 
      .innerJoin(WARNINGS).using(WARNINGS.SIDFILENAME) 
      .where(WARNINGS_HISTORY.IID.greaterThan(maxId)) 
      .and(WARNINGS_HISTORY.DTCREATEDATE.greaterOrEqual(timestampStart)) 
      .and(WARNINGS_HISTORY.DTCREATEDATE.lessOrEqual(timestampEnd)) 
      .orderBy(WARNINGS_HISTORY.IID.asc()) 
      .fetch().into(Warnings.class); 
}

來源

2016-08-02 pez

這樣寫：

public Map<Integer, Warnings> load(
     int maxId, 
     LocalDateTime timestampStart, 
     LocalDateTime timestampEnd) { 
    return create 
      .select(WARNINGS.fields()) 
      .select(WARNINGS_HISTORY.ID) // Add the ID to the SELECT list 
      .from(WARNINGS_HISTORY) 
      .innerJoin(WARNINGS).using(WARNINGS.SIDFILENAME) 
      .where(WARNINGS_HISTORY.IID.greaterThan(maxId)) 
      .and(WARNINGS_HISTORY.DTCREATEDATE.greaterOrEqual(timestampStart)) 
      .and(WARNINGS_HISTORY.DTCREATEDATE.lessOrEqual(timestampEnd)) 
      .orderBy(WARNINGS_HISTORY.IID.asc()) 
      .fetchMap(

       // Mapping the Map key is straight forward 
       r -> r.get(WARNINGS_HISTORY.ID), 

       // Mapping the Map value needs an extra step to avoid the ambiguity 
       // between WARNINGS.ID and WARNINGS_HISTORY.ID when you use into(Class), 
       // i.e. when you use jOOQ's DefaultRecordMapper 
       r -> r.into(WARNINGS).into(Warnings.class) 
      ); 
}

以上利用了ResultQuery.fetchMap(RecordMapper, RecordMapper)

來源

2016-08-05 08:44:57

jOOQ返回一個POJO和來自已加入表的ID

回答

相關問題