Question

嗨我喜欢月亮表jan，feb..dec，我在每个表中都有locatin和actioncount字段，每个表都有重复的位置。

我的查询大致是用SQL编写的，我有月域对象，现在我必须将它转换为Hibernate查询（HQL或Criteria api或其他任何东西......）。我该如何转换它？月份的数量是作为列表提供的，并且是可变的下面的sql来自此列表monthsToQuery = [oct,nov,dec,jan] ..这也是变量列表。它可以是[feb，mar，apr]或[jul]

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

我正在做左联，因为我不想在不同月份之间放松任何地点。

另外：我还有一个日期范围作为输入。到目前为止，我正在从该范围获得一个月的列表，并获得每个月separatley的结果。我需要编写查询以在1个查询中提供最终所需的结果。这是我到现在所拥有的：

// 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
    }

我读了一些地方而不是嵌套标准我也可以在标准中使用别名。我是新来的.. 还有人知道吗？

Answer 1

如果您的模型使用继承

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")))

或界面

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：以下适用于NHibernate和SQLite（也应该在Hibernate中使用）

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();

sql查询转换为hibernate查询的问题

1 个答案: