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SQL-学习使用FOR XML PATH
前言:本人SQL技术很烂,然后工作时间也不久,许多东西都还在学习中,说的不好的地方尽请谅解.
首先跟大家说一下我今天遇到的问题吧.
查出的数据有三列,第一列存放的是32位的GUID,Res_Name存放的是一个物资类型.Res_Data存放的是部门的GUID.我现在需要得到的数据是这样的.
首先大家可以看到.第一张图的Res_Data中有多个部门的GUID,中间用逗号隔开的.
我当时想到的愚蠢的办法就是
1 @MaterialTypeName nvarchar(200), 2 @CentralizedName nvarchar(200), 3 @start int, 4 @limit int, 5 @totalCount int output 6 AS 7 BEGIN 8 SET NOCOUNT ON; 9 select 10 ROW_NUMBER() over (order by res_id asc) as RowNumber,11 * 12 into #List 13 from 14 UBIPlatform..T_RESOURCE 15 WHERE Res_Parent_Code=‘741cdd2bef2e479f8c5dd35cf6e8bf2a‘16 17 18 declare @i int,@count int;19 declare @Centralized nvarchar(200);20 declare @List1 table(id int, ResId nvarchar(50),ResName nvarchar(50),ResData nvarchar(50));21 select @count=COUNT(*) from UBIPlatform..T_RESOURCE WHERE Res_Parent_Code=‘741cdd2bef2e479f8c5dd35cf6e8bf2a‘ 22 set @i=123 while @i<=@count24 begin25 if @i in (select RowNumber from #List)26 begin27 set @Centralized=‘‘;28 select 29 @Centralized=@Centralized+‘,‘+LTRIM(Res_Name) 30 from UBIPlatform.dbo.FN_GETMultiValTable(31 (select 32 Res_Data 33 from 34 UBIPlatform..T_RESOURCE 35 where 36 Res_Id=(select Res_Id from #List where RowNumber=@i))) ge37 inner join UBIPlatform..T_RESOURCE r on r.Res_Id=ge.nvalue38 39 if @Centralized!=‘‘40 begin41 insert into 42 @List1 43 select 44 @i,45 Res_Id,46 Res_Name,47 (RIGHT(@Centralized,LEN(@Centralized)-1)) 48 from 49 UBIPlatform..T_RESOURCE 50 where Res_Id=(select Res_Id from #List where RowNumber=@i)51 end52 else53 begin54 insert into 55 @List1 56 select 57 @i,58 Res_Id,59 Res_Name,60 @Centralized61 from 62 UBIPlatform..T_RESOURCE 63 where Res_Id=(select Res_Id from #List where RowNumber=@i)64 end 65 end66 set @i=@i+167 end68 69 select ROW_NUMBER() over (order by id asc) as RowNumber,* into #List2 from @List1 where 70 (@MaterialTypeName is null or @MaterialTypeName = ‘‘ or ResName like ‘%‘+@MaterialTypeName+‘%‘)71 and (@CentralizedName is null or @CentralizedName = ‘‘ or ResData like ‘%‘+@CentralizedName+‘%‘)72 73 select top(@limit) * from #List2 where RowNumber > @start order by RowNumber asc74 select @totalCount =COUNT(1) from @List175 END
这个是我开始写出来的一个.烂到不行.虽然是解决了我的需求.但是显而易见这种办法是不可取的.后来请教同事,跟我介绍了FOR XML PATH,我查阅了一下就是将查询结果集以XML形式展现.
select Res_Id,Res_Name,Res_Data from UBIPlatform..T_RESOURCE where Res_Parent_Code=‘741cdd2bef2e479f8c5dd35cf6e8bf2a‘ FOR XML PATH
结果:
1 <row> 2 <Res_Id>239dbe35bd8446afb262f62712d8eb1b</Res_Id> 3 <Res_Name>修理费-设备备件</Res_Name> 4 <Res_Data>4BD2D7C9D91546B09BA4438EE583F682</Res_Data> 5 </row> 6 <row> 7 <Res_Id>4d35c89868854d649963410a126b4c30</Res_Id> 8 <Res_Name>低值易耗-计量器具</Res_Name> 9 <Res_Data>4ADEEC453DE04910B0136593CBB4187C</Res_Data>10 </row>11 <row>12 <Res_Id>4e74469a37894ea8a7ddd5e356433119</Res_Id>13 <Res_Name>物料消耗-计算机耗材</Res_Name>14 <Res_Data>4BD2D7C9D91546B09BA4438EE583F682,9C87FFAFD8D24B5BBEA3BF1221DD507B</Res_Data>15 </row>16 <row>17 <Res_Id>608f30860c16430aa8b13f98df0ca9f3</Res_Id>18 <Res_Name>物料消耗-水票</Res_Name>19 <Res_Data></Res_Data>20 </row>21 <row>22 <Res_Id>87a4cefa112241c1b648454e7b3682d9</Res_Id>23 <Res_Name>低值易耗-工具及其他</Res_Name>24 <Res_Data></Res_Data>25 </row>26 <row>27 <Res_Id>c2908fe510dd476aa878622dd9d07c83</Res_Id>28 <Res_Name>物料消耗-杂品</Res_Name>29 <Res_Data></Res_Data>30 </row>31 <row>32 <Res_Id>c9014727c9804c6e9df4cc1bc1487a84</Res_Id>33 <Res_Name>劳动保护费-劳保用品</Res_Name>34 <Res_Data>D5566FDCDBB448FAB4A48D20A2492626</Res_Data>35 </row>36 <row>37 <Res_Id>d3397fdcb454440f88c9c4f9432b3f40</Res_Id>38 <Res_Name>低值易耗-办公设施</Res_Name>39 <Res_Data>9C87FFAFD8D24B5BBEA3BF1221DD507B</Res_Data>40 </row>41 <row>42 <Res_Id>d8222bcaeaba460db945324cb0a93a23</Res_Id>43 <Res_Name>修理费-计算机备件</Res_Name>44 <Res_Data>4BD2D7C9D91546B09BA4438EE583F682</Res_Data>45 </row>
那么,如何改变XML行节点的名称呢?代码如下:
select Res_Id,Res_Name,Res_Data from UBIPlatform..T_RESOURCE where Res_Parent_Code=‘741cdd2bef2e479f8c5dd35cf6e8bf2a‘ FOR XML PATH(‘RESOURCE‘)
原来的行节点<row> 变成了我们在PATH后面括号()中,自定义的名称<RESOURCE>,结果如下:
<RESOURCE> <Res_Id>239dbe35bd8446afb262f62712d8eb1b</Res_Id> <Res_Name>修理费-设备备件</Res_Name> <Res_Data>4BD2D7C9D91546B09BA4438EE583F682</Res_Data></RESOURCE><RESOURCE> <Res_Id>4d35c89868854d649963410a126b4c30</Res_Id> <Res_Name>低值易耗-计量器具</Res_Name> <Res_Data>4ADEEC453DE04910B0136593CBB4187C</Res_Data></RESOURCE><RESOURCE> <Res_Id>4e74469a37894ea8a7ddd5e356433119</Res_Id> <Res_Name>物料消耗-计算机耗材</Res_Name> <Res_Data>4BD2D7C9D91546B09BA4438EE583F682,9C87FFAFD8D24B5BBEA3BF1221DD507B</Res_Data></RESOURCE><RESOURCE> <Res_Id>608f30860c16430aa8b13f98df0ca9f3</Res_Id> <Res_Name>物料消耗-水票</Res_Name> <Res_Data></Res_Data></RESOURCE><RESOURCE> <Res_Id>87a4cefa112241c1b648454e7b3682d9</Res_Id> <Res_Name>低值易耗-工具及其他</Res_Name> <Res_Data></Res_Data></RESOURCE><RESOURCE> <Res_Id>c2908fe510dd476aa878622dd9d07c83</Res_Id> <Res_Name>物料消耗-杂品</Res_Name> <Res_Data></Res_Data></RESOURCE><RESOURCE> <Res_Id>c9014727c9804c6e9df4cc1bc1487a84</Res_Id> <Res_Name>劳动保护费-劳保用品</Res_Name> <Res_Data>D5566FDCDBB448FAB4A48D20A2492626</Res_Data></RESOURCE><RESOURCE> <Res_Id>d3397fdcb454440f88c9c4f9432b3f40</Res_Id> <Res_Name>低值易耗-办公设施</Res_Name> <Res_Data>9C87FFAFD8D24B5BBEA3BF1221DD507B</Res_Data></RESOURCE><RESOURCE> <Res_Id>d8222bcaeaba460db945324cb0a93a23</Res_Id> <Res_Name>修理费-计算机备件</Res_Name> <Res_Data>4BD2D7C9D91546B09BA4438EE583F682</Res_Data></RESOURCE>
OK,接下来我就用这个FOR XML PATH用在我的问题上,
@MaterialTypeName nvarchar(200),@CentralizedName nvarchar(200),@start int,@limit int,@totalCount int output ASBEGIN SET NOCOUNT ON; select t_r.Res_Id as ResId, t_r.Res_Name as ResName, STUFF((select ‘,‘+t_r1.Res_Name from UBIPlatform.dbo.T_RESOURCE t_r1 where t_r1.Res_Id in (select nvalue from UBIPlatform.dbo.FN_GETMultiValTable(t_r.Res_Data)) for xml path(‘‘)),1,1,‘‘) as ResData into #List1 from UBIPlatform..T_RESOURCE t_r where Res_Parent_Code=‘741cdd2bef2e479f8c5dd35cf6e8bf2a‘ select ROW_NUMBER() over (order by ResId asc) as RowNumber, * into #List2 from #List1 where (@MaterialTypeName is null or @MaterialTypeName = ‘‘ or ResName like ‘%‘+@MaterialTypeName+‘%‘) and (@CentralizedName is null or @CentralizedName = ‘‘ or ResData like ‘%‘+@CentralizedName+‘%‘) select top(@limit) * from #List2 where RowNumber > @start order by RowNumber asc select @totalCount =COUNT(1) from #List2END
就这样,才几行的SQL就把我的问题解决了.
SQL-学习使用FOR XML PATH
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