XQuery和Node Ids

时间:2011-06-24 19:01:14

标签: sql tsql sql-server-2008 xquery xquery-sql

我有这个变量:

declare @xmlDoc XML

它中存储了以下xml:

<?xml version="1.0" encoding="utf-8"?>
<NewDataSet>
  <Table1>
    <Sharedparam>shared</Sharedparam>
    <Antoher>sahre</Antoher>
    <RandomParam2>Good stuff</RandomParam2>
    <MoreParam>and more</MoreParam>
    <ResultsParam>2</ResultsParam>
  </Table1>
  <Table1>       
    <RandomParam2>do you</RandomParam2>
    <MoreParam>think</MoreParam>
    <ResultsParam>2</ResultsParam>
  </Table1>
  <Table1>
    <Sharedparam>Last</Sharedparam>
    <Antoher> Set </Antoher>
    <RandomParam2> of </RandomParam2>
    <MoreParam>values</MoreParam>
    <ResultsParam>are here</ResultsParam>
  </Table1>
  <Table1 />
</NewDataSet>

我有这个用于获取数据的查询:

declare @xmlDoc XML
set @xmlDoc = '' -- Stack Overflow could not handle the xml all on one line.

SELECT   -- Param 1
         TBL.SParam.value('local-name((*)[1])', 'varchar(50)') as Param1Name,
         TBL.SParam.value('(*)[1]', 'varchar(100)') as Param1Value,             
         -- Param2
         TBL.SParam.value('local-name((*)[2])', 'varchar(50)') as Param2Name,
         TBL.SParam.value('(*)[2]', 'varchar(100)') as Param2Value, 

         -- Param3           
         TBL.SParam.value('local-name((*)[3])', 'varchar(50)') as Param3Name,
         TBL.SParam.value('(*)[3]', 'varchar(100)') as Param3Value,

         -- Param 4
         TBL.SParam.value('local-name((*)[4])', 'varchar(50)') as Param4Name,
         TBL.SParam.value('(*)[4]', 'varchar(100)') as Param4Value,

         -- Param 5
         TBL.SParam.value('local-name((*)[5])', 'varchar(50)') as Param5Name,
         TBL.SParam.value('(*)[5]', 'varchar(100)') as Param5Value

 FROM    @xmldoc.nodes('/NewDataSet/Table1') AS TBL(SParam)  

我需要一种方法来向我的结果添加它们来自xml文件的顺序。 (这是Table1的第一个实例,然后是第二个......)。

出于SQL table variable limitations的原因,我不能使用标识列来保持这一点。 (出于其他原因,我不想使用临时表。)

我希望有一个很酷的SQL XML函数可以返回某种内部分配的节点ID。 (或其他一些类似的排序方式。)

注意,我不控制这个XML结构(我只是一个读者)所以我无法进行更改以添加ID属性。

任何建议都会很棒!

修改/更新

我真的希望得到这样的数据:

1  |    SharedParam   |   shared
1  |    Antoher       |   sahre
1  |    RandomParam2  |   Good stuff
1  |    MoreParam     |   and more
1  |    ResultsParam  |   and more
2  |    RandomParam2  |   do you
2  |    MoreParam     |   think
2  |    ResultsParam  |   2
3  |    Sharedparam   |   Last
3  |    Antoher       |   Set 
.
.
.

但我很快就会出现。我可以将它列入列(或多或少),但我不知道如何编号。如果你有任何想法,我很乐意听到。

修改
我想出了这样做的查询(在互联网的帮助下)。它看起来像这样:

SELECT  TBL.SParam.value('local-name(.)[1]', 'varchar(50)') as ParamName,
        TBL.SParam.value('(.)[1]', 'varchar(50)') ParamValue, 
        TBL.SParam.value('for $s in . return count(../*[. << $s]) + 1', 'int') ParamPosition,
        TBL.SParam.value('for $s in . return count(../../*[. << $s]) - 1', 'int') ParamIteration 
FROM    @xmldoc.nodes('/NewDataSet/Table1/*') AS TBL(SParam)

2 个答案:

答案 0 :(得分:3)

您可以使用数字表格和position()

 SELECT  N.Number as ID,
         -- Param 1
         TBL.SParam.value('local-name((*)[1])', 'varchar(50)') as Param1Name,
         TBL.SParam.value('(*)[1]', 'varchar(100)') as Param1Value,             
         -- Param2
         TBL.SParam.value('local-name((*)[2])', 'varchar(50)') as Param2Name,
         TBL.SParam.value('(*)[2]', 'varchar(100)') as Param2Value, 

         -- Param3           
         TBL.SParam.value('local-name((*)[3])', 'varchar(50)') as Param3Name,
         TBL.SParam.value('(*)[3]', 'varchar(100)') as Param3Value,

         -- Param 4
         TBL.SParam.value('local-name((*)[4])', 'varchar(50)') as Param4Name,
         TBL.SParam.value('(*)[4]', 'varchar(100)') as Param4Value,

         -- Param 5
         TBL.SParam.value('local-name((*)[5])', 'varchar(50)') as Param5Name,
         TBL.SParam.value('(*)[5]', 'varchar(100)') as Param5Value

 FROM master..spt_values as N
    cross apply @xmldoc.nodes('/NewDataSet/Table1[position()=sql:column("N.Number")]') AS TBL(SParam)
 where N.type = 'P' and
       N.number between 1 and @xmlDoc.value('count(/NewDataSet/Table1)', 'int')

答案 1 :(得分:2)

查看此Fully support position() in xquery的连接请求请求者提供了一些可能对您有用的工作

基于第二种解决方法,我写了以下内容

SELECT  
         p.number,

         TBL.SParam.value('local-name((*)[1])', 'varchar(50)') as Param1Name,
         TBL.SParam.value('(*)[1]', 'varchar(100)') as Param1Value,             
         -- Param2
         TBL.SParam.value('local-name((*)[2])', 'varchar(50)') as Param2Name,
         TBL.SParam.value('(*)[2]', 'varchar(100)') as Param2Value, 

         -- Param3           
         TBL.SParam.value('local-name((*)[3])', 'varchar(50)') as Param3Name,
         TBL.SParam.value('(*)[3]', 'varchar(100)') as Param3Value,

         -- Param 4
         TBL.SParam.value('local-name((*)[4])', 'varchar(50)') as Param4Name,
         TBL.SParam.value('(*)[4]', 'varchar(100)') as Param4Value,

         -- Param 5
         TBL.SParam.value('local-name((*)[5])', 'varchar(50)') as Param5Name,
         TBL.SParam.value('(*)[5]', 'varchar(100)') as Param5Value
 FROM    
    master..spt_values p CROSS APPLY 


     @xmldoc.nodes('NewDataSet/Table1[position()=sql:column("p.number")]') AS TBL(SParam)  
 WHERE P.type = 'P'

返回以下内容

number      Param1Name                                         Param1Value                                                                                          Param2Name                                         Param2Value                                                                                          Param3Name                                         Param3Value                                                                                          Param4Name                                         Param4Value                                                                                          Param5Name                                         Param5Value
----------- -------------------------------------------------- ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ---------------------------------------------------------------------------------------------------- -------------------------------------------------- ----------------------------------------------------------------------------------------------------
1           Sharedparam                                        shared                                                                                               Antoher                                            sahre                                                                                                RandomParam2                                       Good stuff                                                                                           MoreParam                                          and more                                                                                             ResultsParam                                       2
2           RandomParam2                                       do you                                                                                               MoreParam                                          think                                                                                                ResultsParam                                       2                                                                                                                                                       NULL                                                                                                                                                    NULL
3           Sharedparam                                        Last                                                                                                 Antoher                                             Set                                                                                                 RandomParam2                                        of                                                                                                  MoreParam                                          values                                                                                               ResultsParam                                       are here
4                                                              NULL                                                                                                                                                    NULL                                                                                                                                                    NULL                                                                                                                                                    NULL                                                                                                                                                    NULL

(4 row(s) affected)