SQLServer 读取XML类型的节点数据

--	测试数据
--	DROP TABLE #XMLTab
CREATE TABLE #XMLTab(colxml XML)
INSERT INTO #XMLTab 
SELECT N'
<Record id="1629">
  <Exception type="RING_BUFFER_EXCEPTION">
    <Task address="0x0062B8E8" />
    <Error>9003</Error>
    <Severity>error</Severity>
  </Exception>
  <Exception type="BUFFER_EXCEPTION">
    <Task address="0xC452BB39" />
    <Error>8008</Error>
    <Severity>true</Severity>
  </Exception>
</Record>'

INSERT INTO #XMLTab 
SELECT N'
<Record id="1611">
  <Exception type="RING_BUFFER_EXCEPTION">
    <Task address="" />
    <Error>7803</Error>
    <Severity>false</Severity>
  </Exception>
  <Exception type="BUFFER">
    <Task address="0xC4445674" />
    <Error>4300</Error>
    <Severity>right</Severity>
  </Exception>
</Record>'

SELECT colxml FROM #XMLTab

/*两种方法,结果都是一样*/

--[方法一]
SELECT 
 CONVERT(NVARCHAR(50),colxml.query('data(/Record/@id)')) AS [id]
,CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/@type)[1]')) AS [type1]
,CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/Task/@address)[1]')) AS [address1]
,colxml.value('data(/Record/Exception/Error)[1]','varchar(max)') AS [Error1]
,colxml.value('data(/Record/Exception/Severity)[1]','varchar(10)') AS [Severity1]
,CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/@type)[2]')) AS [type2]
,CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/Task/@address)[2]')) AS [address2]
,colxml.value('data(/Record/Exception/Error)[2]','varchar(MAX)') AS [Error2]
,colxml.value('data(/Record/Exception/Severity)[2]','varchar(10)') AS [Severity2]
FROM #XMLTab

--[方法二]
SELECT
 node.c1.value('(@id)[1]','VARCHAR(50)') AS [id]
,node.c1.value('(Exception/@type)[1]','VARCHAR(50)') AS [type1]
,node.c1.value('(Exception/Task/@address)[1]','VARCHAR(50)') AS [address1]
,node.c1.value('(Exception/Error)[1]','VARCHAR(max)') AS [Error1]
,node.c1.value('(Exception/Severity)[1]','VARCHAR(max)') AS [Severity1]
,node.c1.value('(Exception/@type)[2]','VARCHAR(50)') AS [type2]
,node.c1.value('(Exception/Task/@address)[2]','VARCHAR(50)') AS [address2]
,node.c1.value('(Exception/Error)[2]','VARCHAR(max)') AS [Error2]
,node.c1.value('(Exception/Severity)[2]','VARCHAR(max)') AS [Severity2]
FROM #XMLTab CROSS APPLY colxml.nodes('/Record') as node(c1)

--	其他特性
--	将同一节点下的数据合并为一行
SELECT 
 colxml.query('data(/Record/Exception/@type)[1]')  AS [type1]
,colxml.query('data(/Record/Exception/@type)[2]')  AS [type2]
,colxml.query('data(/Record/Exception/@type)')
,CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/@type)')) 
,REPLACE(CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/@type)')),' ',',')
FROM #XMLTab

--	测试合并结果:
SELECT 
 CONVERT(NVARCHAR(50),colxml.query('data(/Record/@id)')) AS [id]
,REPLACE(CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/@type)')),' ',',') AS [type]
,REPLACE(CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/Task/@address)')),' ',',') AS [address]
,REPLACE(CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/Error)')),' ',',') AS [Error]
,REPLACE(CONVERT(NVARCHAR(MAX),colxml.query('data(/Record/Exception/Severity)')),' ',',') AS [Severity]
FROM #XMLTab