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var locations = (from location in session.Query<Location>()                                     
             where 
                (location.MB_ID == 0 || location.MB_ID == null) &&
                (location.hide != "Y" || location.hide == null) &&
                (location.locationNameRaw != "" && location.locationNameRaw != null) &&
                ((location.isIPCapableText != "" && location.isIPCapableText != null) || (
                    (location.ISDNNumber1 != null && location.ISDNNumber1 != "") ||
                    (location.ISDNNumber2 != null && location.ISDNNumber2 != "") ||
                    (location.ISDNNumber3 != null && location.ISDNNumber3 != "") ||
                    (location.ISDNNumber4 != null && location.ISDNNumber4 != "") ||
                    (location.ISDNNumber5 != null && location.ISDNNumber5 != "") ||
                    (location.ISDNNumber6 != null && location.ISDNNumber6 != "")                                        
                ))
                && (location.privateRoom == "N" || location.privateRoom == "" || location.privateRoom != null)
                && (
                        from lll in session.Query<LocationLonLat>()                                             
                        where
                            location.locationID == lll.locationId
                        select lll.locationId
                    ).Any()
                && (location.LastUpdatedTime > lastUpdateTime)
                && location.LocationTimes.Count() > 0
               /*&& (
                        from lt in session.Query<LocationTimes>()
                        where
                            location.locationID == lt.LID
                        select lt.LID
                    ).Any()*/
                select location
                  )
                  .ToList();

Location (1) 和 LocationTimes (many) 之间存在关系，我只想返回一个包含至少一个 LocationTime 记录的位置数据集。

我尝试了几件事...

当我添加该行时：

&& location.LocationTimes.Count() > 0

或者如果我添加以下行：

  && (                      
     from lt in session.Query<LocationTimes>()
     where
    location.locationID == lt.LID
        select lt.LID
     ).Any()

底层连接已关闭：服务器关闭了预期保持活动状态的连接。

我怀疑这可能是因为数据集的大小或其他原因......

有没有更好的方法来做到这一点？就像“左外连接”之类的？

4

1 回答 1

1

我认为一个简单的加入应该做到这一点。

from locationTime in Query<LocationTime>()
join location in Query<Location>() on locationTime.Location.LocationId equals location.LocationId
join locationLat in Query<LocationLat>() on location.LocationLat.LocationLatId equals locationLat.LocationLatId
where ...
select location;
于 2012-07-25T10:01:51.520 回答