SQL Server 2005中查询XML时，文档的多个标签在同一行答案

【问题标题】：When querying XML in SQL Server 2005, multiple tags of the document are in the same rowSQL Server 2005中查询XML时，文档的多个标签在同一行
【发布时间】：2011-03-09 19:25:45
【问题描述】：

更新说明

这是我遇到问题的一个 xml 文件的完整副本。

<Grower_Run xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Puller xsi:type="Puller">
    <Puller_Number xsi:type="xsd:int">16</Puller_Number>
  </Puller>
  <Run_ID xsi:type="xsd:string">SA1611030B</Run_ID>
  <Crucible xsi:type="Crucible">
    <Crucible_Type xsi:type="xsd:string">RWNTYPE</Crucible_Type>
    <Section>
      <Grower_Run_Section>
        <SectionID xsi:type="xsd:string">SA1611030B1</SectionID>
        <Crystal_Growth>
          <Growth_StartTime xsi:type="xsd:dateTime">2011-03-01T12:59:30</Growth_StartTime>
          <Growth_Process>
            <Growth_Process>
              <Process_Name xsi:type="xsd:string">BODY</Process_Name>
              <Single_Moment_Snapshot>
                <Single_Moment_Snapshot>
                  <Snapshot_Name xsi:type="xsd:string">Body Start</Snapshot_Name>
                  <Snapshot_Datetime xsi:type="xsd:dateTime">2011-03-01T17:11:30</Snapshot_Datetime>
                  <Ingot_Length xsi:type="xsd:decimal">228.19</Ingot_Length>
                  <Heater_Temp xsi:type="xsd:decimal">1337.09</Heater_Temp>
                  <LS_Temp xsi:type="xsd:decimal">1243.00</LS_Temp>
                  <Heater_Power xsi:type="xsd:decimal">56.10</Heater_Power>
                </Single_Moment_Snapshot>
                <Single_Moment_Snapshot>
                  <Snapshot_Name xsi:type="xsd:string">Mid Body</Snapshot_Name>
                  <Snapshot_Datetime xsi:type="xsd:dateTime">2011-03-01T17:11:30</Snapshot_Datetime>
                  <Ingot_Length xsi:type="xsd:decimal">228.19</Ingot_Length>
                  <Heater_Temp xsi:type="xsd:decimal">1337.09</Heater_Temp>
                  <LS_Temp xsi:type="xsd:decimal">1243.00</LS_Temp>
                  <Heater_Power xsi:type="xsd:decimal">56.10</Heater_Power>
                </Single_Moment_Snapshot>
                <Single_Moment_Snapshot>
                  <Snapshot_Name xsi:type="xsd:string">Tail Start</Snapshot_Name>
                  <Snapshot_Datetime xsi:type="xsd:dateTime">2011-03-02T01:34:24</Snapshot_Datetime>
                  <Ingot_Length xsi:type="xsd:decimal">230.40</Ingot_Length>
                  <Heater_Temp xsi:type="xsd:decimal">1338.20</Heater_Temp>
                  <LS_Temp xsi:type="xsd:decimal">1243.40</LS_Temp>
                  <Heater_Power xsi:type="xsd:decimal">56.39</Heater_Power>
                </Single_Moment_Snapshot>
              </Single_Moment_Snapshot>
            </Growth_Process>
          </Growth_Process>
          <Growth_FinishTime xsi:type="xsd:dateTime">2011-03-02T01:35:24</Growth_FinishTime>
        </Crystal_Growth>
      </Grower_Run_Section>
      <Grower_Run_Section>
        <SectionID xsi:type="xsd:string">SA1611030B9</SectionID>
        <Crystal_Growth>
          <Growth_StartTime xsi:type="xsd:dateTime">2011-03-02T04:02:37</Growth_StartTime>
          <Growth_Process>
            <Growth_Process>
              <Process_Name xsi:type="xsd:string">BODY</Process_Name>
              <Single_Moment_Snapshot>
                <Single_Moment_Snapshot>
                  <Snapshot_Name xsi:type="xsd:string">Body Start</Snapshot_Name>
                  <Snapshot_Datetime xsi:type="xsd:dateTime">2011-03-02T07:54:39</Snapshot_Datetime>
                  <Ingot_Length xsi:type="xsd:decimal">231.80</Ingot_Length>
                  <Heater_Temp xsi:type="xsd:decimal">1340.00</Heater_Temp>
                  <LS_Temp xsi:type="xsd:decimal">1246.70</LS_Temp>
                  <Heater_Power xsi:type="xsd:decimal">56.60</Heater_Power>
                </Single_Moment_Snapshot>
                <Single_Moment_Snapshot>
                  <Snapshot_Name xsi:type="xsd:string">Mid Body</Snapshot_Name>
                  <Snapshot_Datetime xsi:type="xsd:dateTime">2011-03-02T07:54:39</Snapshot_Datetime>
                  <Ingot_Length xsi:type="xsd:decimal">231.80</Ingot_Length>
                  <Heater_Temp xsi:type="xsd:decimal">1340.00</Heater_Temp>
                  <LS_Temp xsi:type="xsd:decimal">1246.70</LS_Temp>
                  <Heater_Power xsi:type="xsd:decimal">56.60</Heater_Power>
                </Single_Moment_Snapshot>
                <Single_Moment_Snapshot>
                  <Snapshot_Name xsi:type="xsd:string">Tail Start</Snapshot_Name>
                  <Snapshot_Datetime xsi:type="xsd:dateTime">2011-03-03T06:47:19</Snapshot_Datetime>
                  <Ingot_Length xsi:type="xsd:decimal">1778.00</Ingot_Length>
                  <Heater_Temp xsi:type="xsd:decimal">1388.80</Heater_Temp>
                  <LS_Temp xsi:type="xsd:decimal">1330.70</LS_Temp>
                  <Heater_Power xsi:type="xsd:decimal">63.50</Heater_Power>
                </Single_Moment_Snapshot>
              </Single_Moment_Snapshot>
            </Growth_Process>
          </Growth_Process>
          <Growth_FinishTime xsi:type="xsd:dateTime">2011-03-03T06:48:19</Growth_FinishTime>
        </Crystal_Growth>
      </Grower_Run_Section>
    </Section>
  </Crucible>
</Grower_Run>

好的，为了澄清，这里是我的完整查询。

DECLARE @FILES TABLE(FILENAME VARCHAR(20),DEPTH INT,FILE_FLAG INT)
DECLARE @XML_TABLE TABLE(
    xmlFileName VARCHAR(300),
    xml_data xml
)
DECLARE @xmlFileName VARCHAR(300)
DECLARE @FILENAME VARCHAR(20)

INSERT INTO @FILES
EXEC Master.dbo.xp_DirTree '\\SASSOAPPSRV\Grower XML Files\',1,1

DECLARE XML_CURSOR CURSOR FOR SELECT FILENAME FROM @FILES

OPEN XML_CURSOR
FETCH NEXT FROM XML_CURSOR 
INTO @FILENAME

WHILE @@FETCH_STATUS = 0
BEGIN

SELECT  @xmlFileName = '\\SASSOAPPSRV\Grower XML Files\' + @FILENAME

INSERT INTO @XML_TABLE(xmlFileName, xml_data)
EXEC('
SELECT ''' + @xmlFileName + ''', xmlData 
FROM
(
    SELECT  * 
    FROM    OPENROWSET (BULK ''' + @xmlFileName + ''' , SINGLE_BLOB) AS XMLDATA
) AS FileImport (XMLDATA)
')
FETCH NEXT FROM XML_CURSOR 
INTO @FILENAME

END
CLOSE XML_CURSOR
DEALLOCATE XML_CURSOR

DECLARE @PARSED_XML TABLE(
S VARCHAR(200),
RUN_ID VARCHAR(20)
,SECTION_ID VARCHAR(50)
)



INSERT INTO @PARSED_XML
SELECT 
T.xmlFileName AS S,
    t.xml_data.value('(/Grower_Run/Run_ID)[1]', 'varchar(50)') AS 'RunID',
    Section.value('(Grower_Run_Section/SectionID)[1]', 'varchar(50)') as 'SectionID'
FROM
    @xml_table t
CROSS APPLY
    t.xml_data.nodes('/Grower_Run/Crucible/Section') AS Tmp(Section)

SELECT 
S
,RUN_ID
,SECTION_ID
 FROM @PARSED_XML
WHERE RUN_ID = 'SA1611030B'
 ORDER BY RUN_ID

这就是我得到的结果。

\\SASSOAPPSRV\Grower XML Files\SA1611030B.xml   SA1611030B  SA1611030B1

这是问题所在，因为我需要在单独的行中查看来自节点的两个副本的数据。

所以我有许多具有以下结构的 XML 文档

<Grower_Run xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Run_ID xsi:type="xsd:string">SA0111023B</Run_ID>
  <Crucible xsi:type="Crucible">
    <Section>
      <Grower_Run_Section>
        <SectionID xsi:type="xsd:string">SA0111023B1</SectionID>
      </Grower_Run_Section>
    </Section>
    <Section>
      <Grower_Run_Section>
        <SectionID xsi:type="xsd:string">SA0111023B9</SectionID>
      </Grower_Run_Section>
    </Section>
  </Crucible>
</Grower_Run>

我已导入临时表的 XML 字段，我正在使用类似这样的查询来查询该字段

SELECT
   CAST(XML_DATA.query('data(/Grower_Run/Run_ID)') AS VARCHAR(20)) AS [RUN ID]
  ,CAST(XML_DATA.query('data(/Grower_Run/Crucible/Section/Grower_Run_Section/SectionID)') AS VARCHAR(50)) AS [SECTION ID]
FROM @XML_TABLE

所以问题是“SectionID”标签的多个实例的结果显示在同一行中。

即

   RunID    |   SectionID
--------------------------
SA0111023B  |    SA0111023B1  SA0111023B9

应该是什么时候

RunID       |   SectionID
-----------------------------
SA0111023B  |    SA0111023B1  
SA0111023B  |    SA0111023B9

如果我有 [1] 然后像这样结束 xml 查询

CAST(XML_DATA.query('data(/Grower_Run/Crucible/Section/Grower_Run_Section/SectionID)')[1]

它会将第二个部分 ID 一起删除，这不起作用，因为我需要两者。

有什么帮助吗？

【问题讨论】：

标签： sql-server xml sql-server-2005 xquery-sql

【解决方案1】：

如果您想从 XML 文档中选择多个“行”，您需要使用.nodes() SQL Server XML 函数 - 类似这样：

SELECT 
    @XMLTable.value('(/Grower_Run/Run_ID)[1]', 'varchar(50)') AS 'RunID',
    Section.value('(Grower_Run_Section/SectionID)[1]', 'varchar(50)') as 'SectionID'
FROM
    @XMLTable.nodes('/Grower_Run/Crucible/Section') AS Tmp(Section)

FROM 子句中的 XPath 语句基本上定义了 XML 元素的“伪表”——基于该 XPath。因此，您可以在此处为 XML 中的每个 <Section> 条目获得一个伪表 - 然后您可以使用 .value() 函数从中选择单个元素。

如果您想从包含XML 类型列的表中选择它，您可能需要检查CROSS APPLY 命令：

SELECT 
    t.SomeColumn,        
    t.XmlColumn.value('(/Grower_Run/Run_ID)[1]', 'varchar(50)') AS 'RunID',
    Section.value('(Grower_Run_Section/SectionID)[1]', 'varchar(50)') as 'SectionID'
FROM
    dbo.YourTable t
CROSS APPLY
    t.XmlColumn.nodes('/Grower_Run/Crucible/Section') AS Tmp(Section)

【讨论】：

我看到了您在此处提出的建议，但在实施时遇到了麻烦。尝试应用最重要的建议时出现错误：必须声明标量变量“@XML_TABLE”。我将我的 xml 加载到表变量的列中，然后运行这些查询，这很重要。
@Neberu：第一种方法是有效的，因为您将 XML 放在 SQL 变量中。如果你有一张桌子，你需要使用第二种方法
@neberu：好的，那么您想列举哪些个节点？ IS 在您的示例 XML 中只有一个 /Grower_Run/Crucible/Section - 因此您只得到一行 - 按设计工作......（但可能不是你想要的工作......（ )
叮，你刚刚帮我搞定了。我刚刚将 Grower_Run_Section 移至伪表声明，因为它是我需要枚举的那个节点。
@marc_s：顺便说一句。你知道你的 SQL-Server！

【解决方案2】：

这会起作用...，例如：

pref.value('(OriginatorAgency/text())[1]','varchar(50)'),
pref.value('(OriginatorAgency/text())[2]','varchar(50)'),
pref.value('(OriginatorAgency/text())[3]','varchar(50)')

如果有 3 个 OriginatorAgency 项目。

【讨论】：