查询树视图答案

【问题标题】：Query for treeview查询树视图
【发布时间】：2012-09-11 19:00:47
【问题描述】：

我有一个运行良好的查询。

是否有可能如果table3的列（Child）仅与表1相关以在表1下而不是在表2下显示它，但同时另一个（Child）在表2中有父（通常是这种情况）它将在表 2 下显示为当前所做的。

换句话说，子列直接位于 Table2 的行列名称（Father）之下，但有时它位于 Table1 之下，与表 2 无关。

我怎样才能把它放在树视图的查询中？我假设我将不得不用 3 个 for 循环在 c# 中对输出进行编程，在第二个循环中，我可以检查列是孙子还是子，并将其作为树视图的第二行或第二个节点，但我是在 sql 中构建查询时遇到问题。非常感谢任何帮助。

下面的查询显示所有父母，然后是孩子，然后是孙子（一切都很好并且工作），但有时需要孩子代替父亲。

declare @x as xml
set @x =
(
SELECT distinct  
Table1.AssetSysID, Table1.Asset_ID , Table1.FromLR, Table1.Asset_ID + ', ' + Table1.[Desc2] as GarndFather,
Table2.ACISysID ,Table2.PAssetSysID, Table2.FeatureName + ', ' + Table2.[DESC] AS Father,
Table3.ITMSysID  ,Table3.Item_ID + ',' + Table3.[DESC] as Child
FROM  Table1 left outer join 
Table2 ON Table1.AssetSysID = Table2.PAssetSysID left outer join 
Table3 ON Table1.AssetSysID = Table3.AssetSysID AND Table2.ACISysID = Table3.ACISysID
where (Table1.AssetType = @AssetType)
for xml auto,root('xml')
)

Asp.Net Telerik Treeview 数据绑定代码：

<DataBindings>
      <telerik:RadTreeNodeBinding DataMember="Table1" TextField="Assets" ValueField="AssetSysID"  ToolTip="Asset" ImageUrl="~/Images/DeleteIco.png"/>
      <telerik:RadTreeNodeBinding DataMember="Table2" TextField="Feature" ValueField="ACISysID" ToolTip="Feature" ImageUrl="~/Images/CutIco.png"/>
       <telerik:RadTreeNodeBinding DataMember="Table3" TextField="Equipment" ValueField="ITMSysID" ToolTip="Equipment" ImageUrl="~/Images/EditIco.png"/>

    </DataBindings>

*最终代码：

 select Table1.AssetObjID as "@AssetObjID",
           Table1.Asset_ID as "@Asset_ID",
           Table1.FromLR as "@FromLR",
           Table1.AssetType + ', ' + Table1.StreetName + ', ' +  Table1.FromMunicNo   as "@FirstRow",
           (
           select Table2.ACIObjID as "@ACIObjID",
                  Table2.PAssetObjID as "@PAssetObjID",
                  Table2.Feature_ID + ', ' + Table2.FeatureName   AS "@ChildOfFirstRow",
                  (
                  select Table3.ITMObjID as "@ITMObjID",
                         Table3.Item_ID + ',' + Table3.[DESC] as "@GrandChildOfFirstRow"
                  from Table3
                  where Table1.AssetObjID = Table3.AssetObjID and 
                        Table2.ACIObjID = Table3.ACIObjID
                  for xml path('Table3'), type
                  )
           from Table2
           where Table1.AssetObjID = Table2.PAssetObjID
           for xml path('Table2'), type
           ),
(
           select Table3.ITMObjID as "@ITMObjID",
                         Table3.Item_ID + ',' + Table3.[DESC] as "@GrandChildOfFirstRow"
                  from Table3
                  where Table1.AssetObjID = Table3.AssetObjID and 
                        Table2.ACIObjID <> Table3.ACIObjID
                  for xml path('Table3'), type
)
    from Table1
    where Table1.AssetType = 'xxxx'
    for xml path('Table1'), root('xml')

【问题讨论】：

标签： xml sql-server-2008 tsql telerik treeview

【解决方案1】：

从Mikael Eriksson 得到一个想法，并从团队负责人@work 那里得到帮助

     select Table1.AssetObjID as "@AssetObjID",
               Table1.Asset_ID as "@Asset_ID",
               Table1.FromLR as "@FromLR",
               Table1.AssetType + ', ' + Table1.StreetName + ', ' +  Table1.FromMunicNo   as "@FirstRow",
               (
               select Table2.ACIObjID as "@ACIObjID",
                      Table2.PAssetObjID as "@PAssetObjID",
                      Table2.Feature_ID + ', ' + Table2.FeatureName   AS "@ChildOfFirstRow",
                      (
                      select Table3.ITMObjID as "@ITMObjID",
                             Table3.Item_ID + ',' + Table3.[DESC] as "@GrandChildOfFirstRow"
                      from Table3
                      where Table1.AssetObjID = Table3.AssetObjID and 
                            Table2.ACIObjID = Table3.ACIObjID
                      for xml path('Table3'), type
                      )
               from Table2
               where Table1.AssetObjID = Table2.PAssetObjID
               for xml path('Table2'), type
               ),
(
               select Table3.ITMObjID as "@ITMObjID",
                             Table3.Item_ID + ',' + Table3.[DESC] as "@GrandChildOfFirstRow"
                      from Table3
                      where Table1.AssetObjID = Table3.AssetObjID and 
                            Table2.ACIObjID <> Table3.ACIObjID
                      for xml path('Table3'), type
)
        from Table1
        where Table1.AssetType = 'xxxx'
        for xml path('Table1'), root('xml')

所以它是这样的：

<Table1 atrributes......... FirstRow=".........."/>
<Table2 atrributes......... ChildOfFirstRow="..........">
<Table3 atrributes......... GrandChildOfFirstRow=".........."/>
</Table2>
<Table3 atrributes......... GrandChildOfFirstRow="This GrandChild took the importance as equal to ChildOfFirstRow"/>

【讨论】：