我有一个 XML

<response>
  <message_infos>
    <message_info>
      <id>397300589</id>
      <pdu_id>673399673</pdu_id>
      <status>12</status>
      <id>397300589</id>
      <pdu_id>673399675</pdu_id>
      <status>12</status>
    </message_info>
    <message_info>
      <id>397300591</id>
      <pdu_id>673399669</pdu_id>
      <status>12</status>
      <id>397300591</id>
      <pdu_id>673399671</pdu_id>
      <status>12</status>
    </message_info>
  </message_infos>
</response>

我需要另存为

397300589   673399673   12
397300589   673399675   12
397300591   673399669   12
397300591   673399671   12

但是

SELECT *
FROM OPENXML(@ixml, '/response/message_infos/message_info')
WITH (id VARCHAR(50) 'id', pdu_id VARCHAR(50) 'pdu_id', status INT 'status')

给我错误的结果:

397300589   673399673   12
397300591   673399669   12

我做错了什么？我没有找到相同的示例，有人可以帮助我吗？

最佳答案

DECLARE @xml XML = N'
<response>
  <message_infos>
    <message_info>
      <id>397300589</id>
      <pdu_id>673399673</pdu_id>
      <status>12</status>
      <id>397300589</id>
      <pdu_id>673399675</pdu_id>
      <status>12</status>
    </message_info>
    <message_info>
      <id>397300591</id>
      <pdu_id>673399669</pdu_id>
      <status>12</status>
      <id>397300591</id>
      <pdu_id>673399671</pdu_id>
      <status>12</status>
    </message_info>
  </message_infos>
</response>'

SELECT
      id = MIN(CASE WHEN RowNumGroup = 1 THEN val END)
    , pdu_id = MIN(CASE WHEN RowNumGroup = 2 THEN val END)
    , [status] = MIN(CASE WHEN RowNumGroup = 0 THEN val END)
FROM (
    SELECT
          val = t.c.value('(./text())[1]', 'BIGINT')
        , RowNum = ROW_NUMBER() OVER (ORDER BY 1/0)
        , RowNumGroup = ROW_NUMBER() OVER (ORDER BY 1/0) % 3
    FROM @xml.nodes('/response/message_infos/message_info/*') t(c)
) t
GROUP BY RowNum - CASE WHEN RowNumGroup = 0 THEN 3 ELSE RowNumGroup END

2016 年 5 月 30 日更新

准备数据:

SET NOCOUNT ON
IF OBJECT_ID('tempdb.dbo.#xml') IS NOT NULL
    DROP TABLE #xml
GO
CREATE TABLE #xml (data XML)
GO
INSERT INTO #xml
SELECT TOP(10000) N'
<response>
  <message_infos>
    <message_info>
      <id>397300589</id>
      <pdu_id>673399673</pdu_id>
      <status>12</status>
      <id>397300589</id>
      <pdu_id>673399675</pdu_id>
      <status>12</status>
    </message_info>
    <message_info>
      <id>397300591</id>
      <pdu_id>673399669</pdu_id>
      <status>12</status>
      <id>397300591</id>
      <pdu_id>673399671</pdu_id>
      <status>12</status>
    </message_info>
  </message_infos>
</response>'
FROM [master].dbo.spt_values

米凯尔·埃里克森

DECLARE @d DATETIME = GETDATE()

SELECT T.X.value('(id/text())[sql:column("N.N")][1]', 'INT') AS id,
       T.X.value('(pdu_id/text())[sql:column("N.N")][1]', 'INT') AS pdu_id,
       T.X.value('(status/text())[sql:column("N.N")][1]', 'INT') AS [status]
FROM #xml x
CROSS APPLY data.nodes('/response/message_infos/message_info') AS T(X)
CROSS APPLY (
    VALUES
        (1),(2),(3),(4),(5),
        (6),(7),(8),(9),(10)
) AS N(N)
WHERE N.N <= T.X.value('count(id)', 'INT')

SELECT 'Mikael Eriksson: ' +  CAST(CAST(GETDATE() - @d AS TIME) AS VARCHAR(100))
GO

Shnugo

DECLARE @d DATETIME = GETDATE()

WITH AllMessageInfos AS (
    SELECT ROW_NUMBER() OVER(ORDER BY(SELECT NULL)) AS Mi_Index
         , mi.query('.') AS TheMI
    FROM #xml x
    CROSS APPLY data.nodes('/response/message_infos/message_info') AS A(mi)
)
, AllIDs AS (
    SELECT Mi_Index
         , ROW_NUMBER() OVER(PARTITION BY Mi_Index ORDER BY (SELECT NULL)) AS id_Index
         , id.value('.','NVARCHAR(MAX)') AS id
    FROM AllMessageInfos
    CROSS APPLY TheMI.nodes('message_info/id') AS a(id)   
)
, AllPdu_IDs AS (
    SELECT Mi_Index
         , ROW_NUMBER() OVER(PARTITION BY Mi_Index ORDER BY (SELECT NULL)) AS pdu_Index
         , id.value('.','NVARCHAR(MAX)') AS pdu_id
    FROM AllMessageInfos
    CROSS APPLY TheMI.nodes('message_info/pdu_id') AS a(id)   
)
, AllStatus AS (
    SELECT Mi_Index
         , ROW_NUMBER() OVER(PARTITION BY Mi_Index ORDER BY (SELECT NULL)) AS status_Index
         , id.value('.', 'INT') AS status
    FROM AllMessageInfos
    CROSS APPLY TheMI.nodes('message_info/status') AS a(id)   
)
SELECT i.Mi_Index AS MessageInfoIndex
     , i.id_Index AS SubSetIndex
     , i.id
     , p.pdu_id
     , s.[status]
FROM AllIDs AS i
JOIN AllPdu_IDs AS p ON i.Mi_Index = p.Mi_Index AND i.id_Index = p.pdu_Index
JOIN AllStatus AS s ON i.Mi_Index = s.Mi_Index AND i.id_Index = s.status_Index

SELECT 'Shnugo: ' +  CAST(CAST(GETDATE()-@d AS TIME) AS VARCHAR(100))
GO

蒙泰维兹多

DECLARE @d DATETIME = GETDATE()

SELECT 
    m.value('for $i in . return count(../../*[. << $i])', 'INT') AS message_info_position,
    m.value('for $i in . return count(../*[. << $i]) + 1', 'INT') AS internal_position,
    m.value('fn:local-name(.)', 'SYSNAME') AS element_name,
    m.value('.', 'NVARCHAR(4000)') AS element_value
FROM #xml x
CROSS APPLY data.nodes('/response/message_infos/message_info/*') AS A(m)

SELECT 'Montewhizdoh: ' +  CAST(CAST(GETDATE()-@d AS TIME) AS VARCHAR(100))
GO

德瓦特(旧)

DECLARE @d DATETIME = GETDATE()
SELECT
      id = MAX(CASE WHEN name = 'id' THEN val END)
    , pdu_id = MAX(CASE WHEN name = 'pdu_id' THEN val END)
    , [status] = MAX(CASE WHEN name = 'status' THEN val END)
FROM (
    SELECT
          name = t.c.value('local-name(.)', 'SYSNAME')
        , val = t.c.value('.', 'INT')
        , RowNum = ROW_NUMBER() OVER (ORDER BY 1/0)
        , RowNumGroup = ROW_NUMBER() OVER (ORDER BY 1/0) % 3
    FROM #xml x
    CROSS APPLY data.nodes('/response/message_infos/message_info/*') t(c)
) t
GROUP BY RowNum - CASE WHEN RowNumGroup = 0 THEN 3 ELSE RowNumGroup END
SELECT 'Devart (OLD): ' +  CAST(CAST(GETDATE()-@d AS TIME) AS VARCHAR(100))
GO

Devart(新)

DECLARE @d DATETIME = GETDATE()
SELECT
      id = MIN(CASE WHEN RowNumGroup = 1 THEN val END)
    , pdu_id = MIN(CASE WHEN RowNumGroup = 2 THEN val END)
    , [status] = MIN(CASE WHEN RowNumGroup = 0 THEN val END)
FROM (
    SELECT
          val = t.c.value('(./text())[1]', 'BIGINT')
        , RowNum = ROW_NUMBER() OVER (ORDER BY 1/0)
        , RowNumGroup = ROW_NUMBER() OVER (ORDER BY 1/0) % 3
    FROM #xml x
    CROSS APPLY data.nodes('/response/message_infos/message_info/*') t(c)
) t
GROUP BY RowNum - CASE WHEN RowNumGroup = 0 THEN 3 ELSE RowNumGroup END

SELECT 'Devart (NEW): ' +  CAST(CAST(GETDATE()-@d AS TIME) AS VARCHAR(100))

性能比较(Core i5 4460 3.2GHz，DDR3 8Gb，SQL Server 2014 SP1 Express):

Mikael Eriksson: 00:00:00.327
Shnugo:          00:00:00.913
Montewhizdoh:    00:00:01.680
Devart (OLD):    00:00:00.363
Devart (NEW):    00:00:00.200

关于sql-server - OPENXML 未返回预期结果，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37482259/