Can anyone help me to load the following XML into my SQL Server database:
declare #learnxml varchar(5000);
set #learnxml = '
<alerts>
<alert id="XYQ">
<alertTime>2020-01-06T09:49:59.999-0500</alertTime>
<participants>
<item marketCode="CC">MAIN</item>
<item marketCode="CC">PASS</item>
</participants>
</alert>
</alerts>';
DECLARE #xml XML = #learnxml
PRINT #learnxml;
SELECT
xData.value('../../#id','Varchar(100)') AlertId,
xData.value('../../alertTime[1]','Varchar(50)') AlertTime,
xData.value('../item[1]', 'varchar(50)') ParticipantHouse,
xData.value('(.)/#marketCode', 'varchar(20)') HouseMarketCode
FROM
#xml.nodes('./alerts/alert/participants/item') AS x(xData)
Because of the same market code for both the items, the above query populates same value 'Main' instead of populating 2 rows with 2 different values Main and Pass.
What needs to be changed in above query to have 2 different values for the same market code?
Following query returns correct values:
SELECT xData.value('../../#id','Varchar(100)') AlertId,
xData.value('../../alertTime[1]','Varchar(50)') AlertTime,
xData.value('.', 'varchar(50)') ParticipantHouse,
xData.value('#marketCode', 'varchar(20)') HouseMarketCode
FROM #xml.nodes('./alerts/alert/participants/item') as x(xData)
Related
I have a column in my SQL database that is called Triggers_xml_data and its type is ntext. The column is in a xml format and I am trying to get a value from a certain part of the xml. I seen an example of this being done without a column like this:
declare #fileContent xml
set #fileContent ='<my:Header>
<my:Requestor>Mehrlein, Roswitha</my:Requestor>
<my:RequestorUserName>SJM\MehrlR01</my:RequestorUserName>
<my:RequestorEmail>RMehrlein#SJM.com</my:RequestorEmail>
<my:HRContact>Roswita Mehrlein, Beatrice Porta</my:HRContact>
<my:Entity>SJM Germany</my:Entity>
<my:Department>HR/Administration</my:Department>
<my:PositionTitle>Sales Representative</my:PositionTitle>
<my:JobDescription>x0lGQRQAAAABAAAAAAAAAAAeAQAyAAAAVgBAAAAA=</my:JobDescription>
<my:PositionDepartment>Sales</my:PositionDepartment>'
;WITH XMLNAMESPACES ('http://schemas.microsoft.com/office/infopath/2003/myXSD/2005-08-29T12-58-51' as my)
select #fileContent.value('(//my:PositionDepartment)[1]', 'varchar(255)')
But I want to select my column like this:
Declare #filevalue xml
select de.triggers_xml_data
from dbo.DEPLOYMENT_ENVIRONMENT as de
But this is not working and I tried to use this #filecontent.value('(//value)[1]','varchar(255)') and making it equal the column value, I have tried casting it but I can't find a way to do this. Is this possible?
When I do this:
SELECT
CAST(
REPLACE(CAST(de.TRIGGERS_XML_DATA AS VARCHAR(MAX)), 'encoding="utf-16"', '')
AS XML).value('(triggers/triggerDefinition/config/item/value)[1]', 'NVARCHAR(max)') as Item, de.ENVIRONMENT_ID
from dbo.DEPLOYMENT_ENVIRONMENT as de
where de.ENVIRONMENT_ID = 19234819
I am getting a null value returned.
Here is an example of what my xml could look like:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<configuration xml:space="preserve">
<triggers>
<defined>true</defined>
<triggerDefinition>
<id>1</id>
<name>After successful deployment</name>
<userDescription/>
<isEnabled>true</isEnabled>
<pluginKey>com.atlassian.bamboo.triggers.atlassian-bamboo-triggers:afterSuccessfulDeployment</pluginKey>
<triggeringRepositories/>
<config>
<item>
<key>deployment.trigger.afterSuccessfulDeployment.triggeringEnvironmentId</key>
<value>19234819</value>
</item>
</config>
</triggerDefinition>
</triggers>
<bambooDelimiterParsingDisabled>true</bambooDelimiterParsingDisabled>
</configuration>
The XML, as you posted it, is not valid. Your code example does not work... It is not allowed to use a namespace prefix without a namespace declaration. Furthermore your example misses the closing Header-tag...
I corrected this...
DECLARE #yourTbl TABLE(ID INT, YourXML NTEXT);
INSERT INTO #yourTbl VALUES
(1,N'<my:Header xmlns:my="DummyUrl">
<my:Requestor>Mehrlein, Roswitha</my:Requestor>
<my:RequestorUserName>SJM\MehrlR01</my:RequestorUserName>
<my:RequestorEmail>RMehrlein#SJM.com</my:RequestorEmail>
<my:HRContact>Roswita Mehrlein, Beatrice Porta</my:HRContact>
<my:Entity>SJM Germany</my:Entity>
<my:Department>HR/Administration</my:Department>
<my:PositionTitle>Sales Representative</my:PositionTitle>
<my:JobDescription>x0lGQRQAAAABAAAAAAAAAAAeAQAyAAAAVgBAAAAA=</my:JobDescription>
<my:PositionDepartment>Sales</my:PositionDepartment>
</my:Header>');
--Lazy approach
SELECT ID
,CAST(CAST(YourXml AS NVARCHAR(MAX)) AS XML).value(N'(//*:PositionDepartment)[1]','nvarchar(max)')
FROM #yourTbl;
--explicit approach
WITH XMLNAMESPACES('DummyUrl' AS my)
SELECT ID
,CAST(CAST(YourXml AS NVARCHAR(MAX)) AS XML).value(N'(/my:Header/my:PositionDepartment)[1]','nvarchar(max)')
FROM #yourTbl
Some Background
If possible you should not store XML in other format than XML and further more one should avoid NTEXT, as it is depricated since SS2005!.
You have to cast NTEXT to NVARCHAR(MAX) first, than cast this to XML. The second will break, if the XML is not valid. That means: If the XML is really the way you posted it, this cannot work!
UPDATE: String-based approach, if XML does not work
If you cannot cast this to XML you might try this
--String based
WITH Casted AS
(
SELECT ID
,CAST(YourXML AS NVARCHAR(MAX)) AS TheXmlAsString
FROM #yourTbl
)
,WithPosition AS
(
SELECT Casted.*
,CHARINDEX(N'<my:PositionDepartment>',TheXmlAsString) + LEN(N'<my:PositionDepartment>') AS FirstLetter
FROM Casted
)
SELECT ID
,SUBSTRING(TheXmlAsString,FirstLetter,CHARINDEX('<',TheXmlAsString,FirstLetter)-FirstLetter)
FROM WithPosition
UPDATE 2
According to your edit the following returns a NULL value. This is good, because it shows, that the cast was successfull.
SELECT
CAST(
REPLACE(CAST(de.TRIGGERS_XML_DATA AS VARCHAR(MAX)), 'encoding="utf-16"', '')
AS XML).value('(triggers/triggerDefinition/config/item/value)[1]',
'NVARCHAR(max)') as Item, de.ENVIRONMENT_ID
from dbo.DEPLOYMENT_ENVIRONMENT as de
where de.ENVIRONMENT_ID = 19234819
Try this (skip namespace with wildcard):
SELECT
CAST(
REPLACE(CAST(de.TRIGGERS_XML_DATA AS VARCHAR(MAX)), 'encoding="utf-16"', '')
AS XML).value('(*:triggers/*:triggerDefinition/*:config/*:item/*:value)[1]', 'NVARCHAR(max)') as Item, de.ENVIRONMENT_ID
from dbo.DEPLOYMENT_ENVIRONMENT as de
where de.ENVIRONMENT_ID = 19234819
And this should be even better:
SELECT
CAST(CAST(de.TRIGGERS_XML_DATA AS NVARCHAR(MAX)) AS XML).value('(*:triggers/*:triggerDefinition/*:config/*:item/*:value)[1]', 'NVARCHAR(max)') as Item, de.ENVIRONMENT_ID
from dbo.DEPLOYMENT_ENVIRONMENT as de
where de.ENVIRONMENT_ID = 19234819
UPDATE 3
I'd rather cut away the full declaration. Your posted example would go like this
DECLARE #DEPLOYMENT_ENVIRONMENT TABLE(ENVIRONMENT_ID INT, TRIGGERS_XML_DATA NTEXT);
INSERT INTO #DEPLOYMENT_ENVIRONMENT VALUES
(19234819,N'<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<configuration xml:space="preserve">
<triggers>
<defined>true</defined>
<triggerDefinition>
<id>1</id>
<name>After successful deployment</name>
<userDescription/>
<isEnabled>true</isEnabled>
<pluginKey>com.atlassian.bamboo.triggers.atlassian-bamboo-triggers:afterSuccessfulDeployment</pluginKey>
<triggeringRepositories/>
<config>
<item>
<key>deployment.trigger.afterSuccessfulDeployment.triggeringEnvironmentId</key>
<value>19234819</value>
</item>
</config>
</triggerDefinition>
</triggers>
<bambooDelimiterParsingDisabled>true</bambooDelimiterParsingDisabled>
</configuration>');
WITH Casted AS
(
SELECT CAST(de.TRIGGERS_XML_DATA AS NVARCHAR(MAX)) AS XmlAsSting
FROM #DEPLOYMENT_ENVIRONMENT as de
where de.ENVIRONMENT_ID = 19234819
)
SELECT CAST(SUBSTRING(XmlAsSting,CHARINDEX('?>',XmlAsSting)+2,8000) AS XML).value('(/*:configuration/*:triggers/*:triggerDefinition/*:config/*:item/*:value)[1]', 'NVARCHAR(max)') as Item
FROM Casted;
I have an XML file in a format similar to:
<XML>
<Field1>100</Field1>
<Field2>200</Field2>
<Field3>300</Field3>
<Test>400</Test>
</XML>
I need to write a query that will get all of the element values that start with Field. So given the XML above the result should be
FieldVal
--------
100
200
300
I've tried the following but it does not work:
Select
xc.value('text()', 'int')
From
#XMLData.nodes('/XML/[starts-with(name(), ''Field'')]') As xt(xc)
NOTE: I am well aware that this task could be easily done if I reformatted my XML but unfortunately I have no control over the format of the XML.
One way is
declare #XMLData xml ='<XML>
<Field1>100</Field1>
<Field2>200</Field2>
<Field3>300</Field3>
<Test>400</Test>
</XML>'
Select
xc.value('.', 'int')
From #XMLData.nodes('/XML/*') As xt(xc)
WHERE xc.value('local-name(.)', 'varchar(50)') LIKE 'Field%'
Prefix name with special character and check contains instead.
declare #x xml ='<XML>
<Field1>100</Field1>
<Field2>200</Field2>
<Field3>300</Field3>
<Test>400</Test>
</XML>';
select t.n.value('.','varchar(100)')
from #x.nodes ('XML/*[contains(concat("$",local-name()),"$Field")]') t(n);
I think it's this what you are looking for:
DECLARE #xml XML=
'<XML>
<Field1>100</Field1>
<Field2>200</Field2>
<Field3>300</Field3>
<Test>400</Test>
</XML>';
SELECT Fld.value('.','int') AS FieldOnly
FROM #xml.nodes('/XML/*[substring(local-name(.),1,5)="Field"]') AS A(Fld)
Just because of the discussion in comments:
DECLARE #fldName VARCHAR(100)='Field';
SELECT Fld.value('.','int') AS FieldOnly
FROM #xml.nodes('/XML/*[substring(local-name(.),1,string-length(sql:variable("#fldName")))=sql:variable("#fldName")]') AS A(Fld)
Change the first line to "Test" (case sensitive!), and you'd get just the one row with 400...
All
I have very little experience of xml, so please be gentle.
The situation is we use an application called dataswitch to take xml and process it into our ERP system via business objects.
The output I am trying to recreate is as follows from a sample xml document.
**<?xml version="1.0" encoding="Windows-1252" ?>
- <IssueDetails Language="05" CssStyle="" DecFormat="1" DateFormat="01" Role="01" Version="6.0.000">**
- <Item>
<Job>00000121</Job>
<NonStocked>N</NonStocked>
<Warehouse>RM</Warehouse>
<StockCode>BBMB100</StockCode>
<Line>00</Line>
<QuantityToIssue>1.000</QuantityToIssue>
</Item>
</IssueDetails>
So far I have worked on the For xml Path method to build my query and used the sp from Phil Factor to write the output
So far I have been successful creating an xml document which opens in the browser (many tries required!)
This is the output I have managed to create, please note the top lines are different
**<IssueDetails xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">**
- <Item>
<Job>00044816</Job>
<NonStocked>N</NonStocked>
<Warehouse>C2</Warehouse>
<StockCode>FG00707</StockCode>
<Line>00</Line>
<QuantityToIssue>400.000000000</QuantityToIssue>
</Item>
- <Item>
<Job>00044816</Job>
<NonStocked>N</NonStocked>
<Warehouse>C2</Warehouse>
<StockCode>FG00707</StockCode>
<Line>00</Line>
<QuantityToIssue>10.000000000</QuantityToIssue>
</Item>
</IssueDetails>
So my question is how do I get the top line in my output to be the same as the sample output?
My procedure is listed below
Declare
#XML_1 varchar (max),
#myXML varchar(max),
#myFile varchar (30),
#Path varchar (100)
set #XML_1=''
set #myFile ='MaterialIssuesTest.xml'
set #Path='D:\Temp\'
--Query database for materials
Set #XML_1 =#XML_1 + ( SELECT WJM.[Job]
,Case when WJM.[Warehouse]='**' then 'Y' else 'N' end as NonStocked
,WJM.[Warehouse]
,rtrim(LP.StockCode) as StockCode
,WJM.[Line]
,[UnitQtyReqd]*LP.LQtyComplete as QuantityToIssue
FROM [SysproCompanyR].[dbo].[WipJobAllMat] WJM
inner join CHC_Production.LabPostsAtMileOps LP On WJM.Job=LP.Job
Where WJM.Job in ('00044816')and (WJM.OperationOffset > LP.PrevOp
and WJM.OperationOffset<LP.LOperation)
FOR XML Path ('Item'),ROOT ('IssueDetails'), ELEMENTS XSINIL
)
set #myXML = LTRIM(rtrim(#XML_1))
--Debug print xml
Print #myXML
--Output xml to document
execute dbo.spWriteStringToFile #myXML, #Path, #myFile
GO
To get you first line, which is a child element of the main body you need to do a sub query like what I have done below. To get the attributes you need to name them with the # symbol, again in my example (formatting changes to aid me setting it out!):
SET #XML_1 =#XML_1 +
(
SELECT WJM.[Job],
(
SELECT '' AS '#Language',
'' AS '#CssStyle',
'' AS '#DecFormat',
'' AS '#DateFormat',
'' AS '#Role',
'' AS '#Version'
FROM YOURTABLENAME YTN
WHERE YTN.[SOMEFIELD] = WJM.[SOMEFIELD]
FOR XML PATH(''), TYPE
) AS 'IssueDetails'
,Case when WJM.[Warehouse]='**' then 'Y' else 'N' end as NonStocked
,WJM.[Warehouse]
,rtrim(LP.StockCode) as StockCode
,WJM.[Line]
,[UnitQtyReqd]*LP.LQtyComplete as QuantityToIssue
FROM [SysproCompanyR].[dbo].[WipJobAllMat] WJM
INNER JOIN CHC_Production.LabPostsAtMileOps LP ON WJM.Job = LP.Job
WHERE WJM.Job IN ('00044816') AND (WJM.OperationOffset > LP.PrevOp
AND WJM.OperationOffset<LP.LOperation)
FOR XML Path ('Item'), ROOT ('IssueDetails'), ELEMENTS XSINIL
)
I don't know where the data is coming from, so you will have to fill in the table name and the WHERE clause to join it to the data that you already have. That is assuming the data is a child of the data that you have already provided.
Bare in mind the syntax might not be quite correct as I am doing this from memory and there are several different variations to get this result.
I have to query an XML to extract the data and put it into columns. This works perfectly. However, I want to include a loop because the structure in the XML is as follows:
<BlockOrderMessage>
<FlightOrder>
<Flight>
<FlightNr>5</FlightNr>
<AircraftType>A255</AircraftType>
</Flight>
<PositionOrders>
<PositionOrder Unit="Unit 5">
<UnitName>UnitName5</UnitName>
<CardColor>Blue</CardColor>
</PositionOrder>
<PositionOrder Unit='Unit 6">
<UnitName>UnitName6</UnitName>
<CardColor>Red</CardColor>
</PositionOrder>
</PositionOrders>
</FlightOrder>
</BlockOrderMessage>
There's always only one , but there can be more ... Now, I can generate the column (when knowing the amount of ) using following code:
DECLARE #Data XML
SET #Data =
'<?xml version="1.0" encoding="UTF-8"?>
<BlockOrderMessage xmlns="http://www...."
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.... file:/C:/Users/.....xsd">
<FlightOrder>
<Flight>
<FlightNr>FlightNr0</FlightNr>
<AircraftType>AircraftType0</AircraftType>
<PositionOrders>
<PositionOrder Unit="Unit 5">
<UnitName>UnitName5</UnitName>
<CardColor>Blue</CardColor>
</PositionOrder>
<PositionOrder Unit="Unit 6">
<UnitName>UnitName6</UnitName>
<CardColor>Red</CardColor>
</PositionOrder>
</PositionOrders>
</FlightOrder>
</BlockOrderMessage>'
;WITH XMLNAMESPACES (DEFAULT 'http://www....')
SELECT #Data.value('(/BlockOrderMessage/FlightOrder/Flight/FlightNr)[1]','VARCHAR(20)') AS 'FlightNr',
#Data.value('(/BlockOrderMessage/FlightOrder/Flight/AircraftType)[1]','VARCHAR(20)') AS 'AircraftType',
#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder/#Unit)[1]','VARCHAR(30)') AS 'PosOrder1_Unit ',
#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder/UnitName)[1]','VARCHAR(30)') AS 'PosOrder1_UnitName',
#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder/CardColor)[1]','VARCHAR(30)') AS 'PosOrder1_CardColor',
#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder[2]/#Unit)[1]','VARCHAR(30)') AS 'PosOrder2_Unit',
#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder[2]/UnitName)[1]','VARCHAR(30)') AS 'PosOrder2_UnitName',
#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder[2]/CardColor)[1]','VARCHAR(30)') AS 'PosOrder2_CardColor'
But I want to insert a loop for the PositionOrder bit, I tried the following code (only the last part, since the rest stays the same):
;WITH XMLNAMESPACES (DEFAULT 'http://www....')
SELECT #Data.value('(/BlockOrderMessage/FlightOrder/Flight/FlightNr)[1]','VARCHAR(20)') AS 'FlightNr',
#Data.value('(/BlockOrderMessage/FlightOrder/Flight/AircraftType)[1]','VARCHAR(20)') AS 'AircraftType'
DECLARE #counter INT
SET #counter = 1
WHILE (#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder/#Unit)[1]') IS NOT NULL)
BEGIN
;WITH XMLNAMESPACES (DEFAULT 'http://www....')
SELECT #Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder/#Unit)[1]','VARCHAR(30)') AS 'PosOrder_#counter_Unit ',
#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder/UnitName)[1]','VARCHAR(30)') AS 'PosOrder_#counter_UnitName',
#Data.value('(/BlockOrderMessage/FlightOrder/PositionOrders/PositionOrder/CardColor)[1]','VARCHAR(30)') AS 'PosOrder_#counter_CardColor'
SET #counter = #counter +1
END
GO
Now, I have the following problems with this loop and the result of my query:
The results of the query for the PositionOrder are all NULL, this wasn't the case when I did it without loops.
I get two tables as query result, but I want them in one table. I tried to do it so I only use one SELECT statement, but I can't get the code right.
I want the name of the column to show the counter number: So if we are in the second loop, we want the name of the column to be PosOrder_2_..., now it shows PosOrder_#counter_...
Does anybody know what I am doing wrong or how I should fix this problem?
Thanks in advance!
Are you looking for something like this?
DECLARE #Flights XML = '<BlockOrderMessage>
<FlightOrder>
<Flight>
<FlightNr>5</FlightNr>
<AircraftType>A255</AircraftType>
</Flight>
<PositionOrders>
<PositionOrder Unit="Unit 5">
<UnitName>UnitName5</UnitName>
<CardColor>Blue</CardColor>
</PositionOrder>
<PositionOrder Unit="Unit 6">
<UnitName>UnitName6</UnitName>
<CardColor>Red</CardColor>
</PositionOrder>
</PositionOrders>
</FlightOrder>
</BlockOrderMessage>'
SELECT
FlightNr = FltOrder.value('(Flight/FlightNr)[1]', 'int'),
AircraftType = FltOrder.value('(Flight/AircraftType)[1]', 'varchaR(100)'),
PosOrderUnit = PosOrder.value('#Unit', 'varchar(50)'),
PosOrderUnitName = PosOrder.value('(UnitName)[1]', 'varchar(50)'),
PosOrderCardColor = PosOrder.value('(CardColor)[1]', 'varchar(50)')
FROM
#Flights.nodes('/BlockOrderMessage/FlightOrder') AS XTbl(FltOrder)
CROSS APPLY
FltOrder.nodes('PositionOrders/PositionOrder') AS XTbl2(PosOrder)
This would produce an output something like this:
Basically, it grabs the "base" data from the <BlockOrderMessage> / <FlightOrder> node and displays those in columns 1 & 2, and then it cross applies all subnodes <PositionOrders> / <PositionOrder> inside that <FlightOrder> node and extracts the remaining information from those subnodes (any number of them).
I am unsure how to get the value of dc:creator from an RSS-feed using SQL.
This is my xml/rss-feed:
<rss xmlns:dc="http://purl.org/dc/elements/1.1/" version="2.0">
<channel>
<title>Foobar RSS</title>
<link>http://www.foobar.com/</link>
<description>RSS feed</description>
<language>en</language>
<ttl>15</ttl>
<item>
<title>This is my title</title>
<link>http://www.foobar.com/link/blabla</link>
<description>Bla..bla..bla..</description>
<dc:creator>John Doe</dc:creator>
<guid isPermaLink="false">00082EA751F1D905DE00E7CFA2417DA9</guid>
<pubDate>Wed, 26 Oct 2011 00:00:00 +0200</pubDate>
</item>
</channel>
</rss>
In my SQL I use something like this to get the values - e.g for pubDate I use something like this:
DECLARE #xml XML
SET #xml = cast('my rss feed here' AS xml)
SELECT
convert(datetime,substring(T.nref.value('pubDate[1]','nvarchar(100)'),6,20)) as pubdate,
FROM #xml.nodes('//item') AS T(nref)
This works fine, but when I am trying to get dc:creator value 'John Doe', the following just gives me an error:
SELECT
T.nref.value('dc:creator','nvarchar(100)') as creator
FROM #xml.nodes('//item') AS T(nref)
error:
XQuery [value()]: The name "dc" does not denote a namespace.
I need to be able to select multiple columns from the rss-feed. Can anybody provide a solution or direction to get the value of dc:creator?
I have another question - how would you construct the code if you are doing it in a sub select?
E.g.
INSERT INTO RSSResults (ID, pubDate)
SELECT #ID, tbl.pubDate FROM (
;WITH XMLNAMESPACES('http://purl.org/dc/elements/1.1/' AS dc)
SELECT
RSS.Item.value('(dc:creator)[1]', 'nvarchar(100)') as pubDate
FROM
#xml.nodes('/rss/channel/item') as RSS(Item)) AS tbl
The code breaks at ";WITH XMLNAMESPACES". Is it possible to include the namespace directly in the statement somehow?
Try something like this:
DECLARE #xml XML
SET #xml = cast('my rss feed here' AS xml)
;WITH XMLNAMESPACES('http://purl.org/dc/elements/1.1/' AS dc)
SELECT
#xml.value('(rss/channel/item/dc:creator)[1]', 'nvarchar(100)')
If you need to catch multiple items - try this:
DECLARE #xml XML
SET #xml = cast('my rss feed here' AS xml)
;WITH XMLNAMESPACES('http://purl.org/dc/elements/1.1/' AS dc)
SELECT
RSS.Item.value('(dc:creator)[1]', 'nvarchar(100)')
FROM
#xml.nodes('/rss/channel/item') as RSS(Item)