使用T-SQL查询在XML节点中拾取值

我想在父节点为

标记的每个

标记中获取值。如果您看到下面的示例。我在标签48和1500中有两个值

我的查询返回481500。我在下面展示了一个示例xml和查询。在其他一些xml中，我可能有10个以上的值-有什么能帮助我吗

示例XML：

declare @xml xml = 
    '<maintask chg="U" identask="25/63/00/000/000/056" nrd="-" revdate="2013.12.05" version="B2,B3">
         <title chg="N">Electric hoist 136 kg</title>
         <mainlimi category="1">
             <limit msmgeographic="" type="TBO" />
             <nextperf>
                 <interv>
                     <msmlimitorder>1</msmlimitorder>
                     <msmtemporarylimit>False</msmtemporarylimit>
                     <val>48</val>
                     <unit>M</unit>
                     <margin>
                         <val>146</val>
                         <unit>D</unit>
                     </margin>
                     <marginmin>
                         <val>0</val>
                         <unit>D</unit>
                     </marginmin>
                     <marginmax>
                         <val>0</val>
                         <unit>D</unit>
                     </marginmax>
                 </interv>
                 <interv>
                     <msmlimitorder>2</msmlimitorder>
                     <msmlimitoperator>//</msmlimitoperator>
                     <msmtemporarylimit>False</msmtemporarylimit>
                     <val>1500</val>
                     <unit>HC</unit>
                     <margin>
                         <val>150</val>
                         <unit>HC</unit>
                     </margin>
                     <marginmin>
                         <val>0</val>
                         <unit>HC</unit>
                     </marginmin>
                     <marginmax>
                         <val>0</val>
                         <unit>HC</unit>
                     </marginmax>
                 </interv>
             </nextperf>
                <pnrlist>
                  <pnrdata>
                    <pnr wp6sourceid="4">76370-110</pnr>
                    <validity />
                    <pn>704A41815032</pn>
                  </pnrdata>
                  <pnrdata>
                    <pnr wp6sourceid="5">76370-111</pnr>
                    <validity />
                    <pn>704A41815033</pn>
                  </pnrdata>
                  <pnrdata>
                    <pnr>xna</pnr>
                    <validity />
                    <pn>704A41815035</pn>
                  </pnrdata>
                  <pnrdata>
                    <pnr wp6sourceid="7">76370-130-D</pnr>
                    <validity />
                    <pn>-</pn>
                  </pnrdata>
                  <pnrdata>
                    <pnr wp6sourceid="8">76370-140-D</pnr>
                    <validity />
                    <pn>704A41815085</pn>
                  </pnrdata>
                </pnrlist>
              </mainlimi>
              <desc>
                <para chg="N">LUCAS AIR EQUIPEMENT/TRW/GOODRICH.</para>
              </desc>
              <nrd code="-">
                <para chg="N" />
              </nrd>
              <climaticconditionlist>
                <climaticcondition code="-">
                  <para chg="N" />
                </climaticcondition>
              </climaticconditionlist>
            </maintask>'

结果:

MI                          Title                       Remarks                     val     unit
25/63/00/000/000/056    Electric hoist 136 kg   LUCAS AIR EQUIPEMENT/TRW/GOODRICH.  481500  MHC

预期结果：

MI                          Title                       Remarks                     val     unit
25/63/00/000/000/056    Electric hoist 136 kg   LUCAS AIR EQUIPEMENT/TRW/GOODRICH.  48       M
25/63/00/000/000/056    Electric hoist 136 kg   LUCAS AIR EQUIPEMENT/TRW/GOODRICH.  1500     HC

---

你几乎做到了。只需使用

CROSS-APPLY

，就可以找到需要查询值的项目：

SELECT ISNULL(P.c.value('@identask','VARCHAR(100)') ,'')AS MI
      ,P.c.query('title').value('.','NVARCHAR(100)') AS Title
      ,P.c.query('desc/para').value('.','NVARCHAR(100)') AS Remarks
      ,T.c.value('(./val)[1]', 'NVARCHAR(100)') AS val
      ,T.c.value('(./unit)[1]', 'NVARCHAR(100)') AS unit 
FROM @xml.nodes('/maintask') P(c)
CROSS APPLY P.c.nodes('./mainlimi/nextperf/interv') T(c);

---

你差不多完成了。只需使用

CROSS-APPLY

，就可以找到需要查询值的项目：

SELECT ISNULL(P.c.value('@identask','VARCHAR(100)') ,'')AS MI
      ,P.c.query('title').value('.','NVARCHAR(100)') AS Title
      ,P.c.query('desc/para').value('.','NVARCHAR(100)') AS Remarks
      ,T.c.value('(./val)[1]', 'NVARCHAR(100)') AS val
      ,T.c.value('(./unit)[1]', 'NVARCHAR(100)') AS unit 
FROM @xml.nodes('/maintask') P(c)
CROSS APPLY P.c.nodes('./mainlimi/nextperf/interv') T(c);