問題與SQL查詢轉換爲冬眠查詢

Question

嗨，我喜歡月智表jan，feb..dec和我有locatin和actioncount字段中每個表中重複的位置。

我有這個查詢大致寫在SQL中，我有月域對象，現在我必須將其轉換爲Hibernate查詢（HQL或標準api或其他任何..）。我如何轉換它？ 月的計數是作爲一個列表提供的，並且是如此的變量 下面的sql是從這個列表monthsToQuery = [oct,nov,dec,jan] ..這也是變量列表。 它可以是[二月，三月，四月]或[月]

select loc, sum(tcount) from (
        (select location as loc, sum(actioncount) as tcount from oct group by location) left-join 
        (select location as loc, sum(actioncount) as tcount from nov group by location) left-join 
        (select location as loc, sum(actioncount) as tcount from dec group by location) left-join 
        (select location as loc, sum(actioncount) as tcount from jan group by location) 

        ) group by loc 

我做左加入，因爲我不想失去不同月份之間的任何位置。

此外：我還有一個日期範圍作爲輸入。到目前爲止，我正在從範圍中獲得一個月的列表，並獲得每月分離的結果。我需要編寫查詢以在1個查詢中提供最終的所需結果。 這裏是我有什麼至今：

// sTblList - list of all month domains in the date range.. 
def getSummary(sTblList,SfromDate,StoDate,res_id, groupCol,sumCol){ 
     try{ 
     Date fromDate = new Date().parse("yyyy-MM-dd", SfromDate); 
     Date toDate = new Date().parse("yyyy-MM-dd", StoDate); 

     def resourceInstance=Resources.get(res_id); 
     sTblList.each{ 
     def OnemonthList=it.createCriteria().get {  
      eq('graresource',resourceInstance) 
      between('currentdate', fromDate, toDate)   
      projections { 
      sum(sumCol,'tcount') 
      groupProperty(groupCol)  
       }     
      }  

     return sumMap // sumMap should have all months results combined 
    } 

我看了一些地方，與其嵌套規定 - 我還可以在條件中使用別名。我是新來的.. 有沒有人知道更進一步？

Answer 1

如果您的模型使用繼承

abstract class Month 
{ 
    string location; 
    int actionCount; 
} 

class January extends Month 
{ 
} 

session.CreateCriteria(Month.class) 
    .SetProjection(Projections.ProjectionList() 
     .Add(Projections.GroupProperty("Location")) 
     .Add(Projections.Sum("ActionCount"))) 

或接口

class Month implements HasActionCount 
{ 
    string location; 
    int actionCount; 
} 

session.CreateCriteria(HasActionCount.class) 
    .SetProjection(Projections.ProjectionList() 
     .Add(Projections.GroupProperty("Location")) 
     .Add(Projections.Sum("ActionCount"))) 

更新：爲NHibernate和SQLite的以下作品（也應該在Hibernate中工作）

class Month 
{ 
    public virtual int Id { get; set; } 
    public virtual string Location { get; set; } 
    public virtual int ActionCount { get; set; } 
} 

class January : Month 
{ 
} 

class February : Month 
{ 
} 

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> 
    <class xmlns="urn:nhibernate-mapping-2.2" name="ConsoleApplication1.January, ConsoleApplication1" table="`January`"> 
    <id name="Id"> 
     <generator class="identity" /> 
    </id> 
    <property name="Location" /> 
    <property name="ActionCount" /> 
    </class> 
    <class xmlns="urn:nhibernate-mapping-2.2" name="ConsoleApplication1.February, ConsoleApplication1" table="`February`"> 
    <id name="Id"> 
     <generator class="identity" /> 
    </id> 
    <property name="Location" /> 
    <property name="ActionCount" /> 
    </class> 
</hibernate-mapping> 

// works as expected 
IList<Month> months = session.CreateCriteria<Month>().List<Month>(); 

// returns the location and sum of each month though 
IList<Object[]> sums = (Object[])session.CreateCriteria<Month>() 
    .SetProjection(Projections.ProjectionList() 
     .Add(Projections.GroupProperty("Location")) 
     .Add(Projections.Sum("ActionCount"))) 
    .List();