You're welcome. Glad we could help.
I just saw arthurolcot's post.
If the log entries are always singular, that will work. I used the nodes() function in my solution in case a single XML entry could possibly contain more than one log entry.
It won't work if the data ever looks like:
DECLARE @xml XML
SET @xml = '<server name="Server1">
<log>
<logItem type="LogDate">
<value string="2012/12/15" />
</logItem>
<logItem type="error">
<value string="File not found" />
</logItem>
<logItem type="source">
<value string="Dir/SubDir/SomeFile" />
</logItem>
</log>
<log>
<logItem type="LogDate">
<value string="2012/12/15" />
</logItem>
<logItem type="error">
<value string="Another error" />
</logItem>
<logItem type="source">
<value string="Dir/SubDir/SomeFile" />
</logItem>
</log>
</server>'
SELECT @xml.value('(/server/log/logItem[@type="error"]/value/@string)[1]', 'varchar(50)')
The version I posted will handle that:
IF OBJECT_ID(N'tempdb..#T') IS NOT NULL
DROP TABLE #T;
CREATE TABLE #T
(ID INT IDENTITY
PRIMARY KEY,
LogXML XML NOT NULL);
INSERT INTO #T
(LogXML)
VALUES ('
<server name="Server1">
<log>
<logItem type="LogDate">
<value string="2012/12/11" />
</logItem>
<logItem type="error">
<value string="File not found" />
</logItem>
<logItem type="source">
<value string="Dir/SubDir/SomeFile" />
</logItem>
</log>
</server>'),
('
<server name="Server1">
<log>
<logItem type="LogDate">
<value string="2012/12/10" />
</logItem>
<logItem type="error">
<value string="Another error" />
</logItem>
<logItem type="source">
<value string="Dir/SubDir/SomeFile" />
</logItem>
</log>
<log>
<logItem type="LogDate">
<value string="2012/12/10" />
</logItem>
<logItem type="error">
<value string="Yet another error" />
</logItem>
<logItem type="source">
<value string="Dir/SubDir/SomeFile" />
</logItem>
</log>
</server>')
SELECT ID, LogItem.value('(/logItem/value/@string)[1]', 'varchar(max)') AS ErrorString
FROM (SELECT ID,
L.Item.query('.') AS LogItem
FROM #T AS T
CROSS APPLY LogXML.nodes('/server/log/logItem') AS L (Item)) AS Sub
WHERE LogItem.exist('/logItem[(@type cast as xs:string?) eq xs:string("error")]') = 1;
I'm not sure what your data looks like (of course), but I usually try to err on the side of assuming XML will have more than one node. After all, that's part of what it's for.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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