SQL SERVER 读取XML类型字段的方式。
(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),y('data(/Record/@id)')) AS [id],CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/@type)[1]')) AS [type1],CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/Task/@address)[1]')) AS [address1],e('data(/Record/Exception/Error)[1]','varchar(max)') AS [Error1],e('data(/Record/Exception/Severity)[1]','varchar(10)') AS [Severity1],CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/@type)[2]')) AS [type2],CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/Task/@address)[2]')) AS [address2],e('data(/Record/Exception/Error)[2]','varchar(MAX)') AS [Error2],e('data(/Record/Exception/Severity)[2]','varchar(10)') AS [Severity2]FROM #XMLTab
(03)方法二:e('(@id)[1]','VARCHAR(50)') AS [id],e('(Exception/@type)[1]','VARCHAR(50)') AS [type1],e('(Exception/Task/@address)[1]','VARCHAR(50)') AS [address1],e('(Exception/Error)[1]','VARCHAR(max)') AS [Error1],e('(Exception/Severity)[1]','VARCHAR(max)') AS [Severity1],e('(Exception/@type)[2]','VARCHAR(50)') AS [type2],e('(Exception/Task/@address)[2]','VARCHAR(50)') AS [address2],e('(Exception/Error)[2]','VARCHAR(max)') AS [Error2],e('(Exception/Severity)[2]','VARCHAR(max)') AS [Severity2]FROM #XMLTab CROSS APPLY s('/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,y('data(/Record/Exception/@type)[1]') AS [type1],y('data(/Record/Exception/@type)[2]') AS [type2],y('data(/Record/Exception/@type)'),CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/@type)')),REPLACE(CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/@type)')),' ',',')FROM #XMLTab
(05)测试合并结果:SELECTCONVERT(NVARCHAR(50),y('data(/Record/@id)')) AS [id],REPLACE(CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/@type)')),' ',',') AS [type],REPLACE(CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/Task/@address)')),' ',',') AS [address],REPLACE(CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/Error)')),' ',',') AS [Error],REPLACE(CONVERT(NVARCHAR(MAX),y('data(/Record/Exception/Severity)')),' ',',') AS [Severity]FROM #XMLTab