SQL SERVER 如何读取类型为XML的字段
SQL SERVER 读取XML类型字段的方式。
操作方法
- 01
先创建一个测试的临时表：-- 测试数据-- DROP TABLE #XMLTabCREATE 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
- 02
读取XML字段方法有两种，方法一：SELECTCONVERT(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
- 03
方法二：SELECTnode.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)两种方法都可以得到下面的效果：
- 04
其他的用法，比如：将同一节点下的数据合并为一行，SELECTcolxml.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
- 05
测试合并结果:SELECTCONVERT(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
