I want to copy the values of one node to another in sql server(2005 and 2008).
e.g if one of the xml data is as below
<Data>
<Name></Name>
<ShortName>Joe</ShortName>
</Data>
the resulting xml should be
<Data>
<Name>Joe</Name>
<ShortName>Joe</ShortName>
the update statement should affect all the rows in the table
appreciate any help
thanks
You have to watch out for Silent XQuery failures.
The problem in this case is that XPath expression (/Data/Name/text())1 returns an empty sequence. ‘Name’ is an empty element (It has no children). Therefore the expression (/Data/Name/text())1 doesn’t point to any existing node. The solution to this problem is to insert a new text node inside the Name element, like this:
DECLARE #myDoc xml
SET #myDoc = '<Data>
<Name></Name>
<Name2>dd</Name2>
<ShortName>Joe</ShortName>
</Data>'
SELECT #myDoc
if (#myDoc.exist('(/Data/Name/text())[1]') = 1) BEGIN
set #myDoc.modify('
replace value of (/Data/Name/text())[1]
with (/Data/ShortName/text())[1]
')
end else begin
set #myDoc.modify('
insert (/Data/ShortName/text())[1]
as first into (/Data/Name)[1]
')
end
SELECT #myDoc
got the solution
update table set col.modify(replace value of (/Name/text())[1] with (/ShortName/text())[1])
Related
I am working on XML structures and cannot solve a problem;
SET #V_XML.modify('replace value of (/Table/Header/Column/#readonly)[1] with "False" ')
This is working but '[1]' is my column number and i want to make it parametric.
SET #V_XML.modify('replace value of (/Table/Header/Column/#readonly)[sql:variable("#MYCOLUMNNUM")] with "False" ')
this fails me
please help, thank you
You didn't share your XML, so I devised it on my own.
If you need to change an attribute value in a particular column by its sequential number, you need to use a predicate right after the Column element.
SQL
-- DDL and sample data population, start
DECLARE #V_XML XML =
(N'<Table>
<Header>
<Column readonly="True"></Column>
<Column readonly="True"></Column>
<Column readonly="True"></Column>
</Header>
</Table>');
-- DDL and sample data population, end
DECLARE #MYCOLUMNNUM INT = 3;
-- before
SELECT #V_XML;
SET #V_XML.modify('replace value of (/Table/Header/Column[sql:variable("#MYCOLUMNNUM")]/#readonly)[1] with "False"');
-- after
SELECT #V_XML;
I do have to replicate an XML file with SQL Server and I am now stumbling over the following structure inside the XML file and I don't know how to replicate that.
The structure looks like this at the moment for certain tags:
<ART_TAG1>
<UNMLIMITED/>
</ART_TAG1>
<ART_TAG2>
<ART_TAG3>
<Data_Entry/>
</ART_TAG3>
</ART_TAG2>
I am wondering if this is proper XML that the data inside (unlimited and Data_Entry) is enclosed with a closing XML tag. The XML validator https://www.w3schools.com/xml/xml_validator.asp is telling me this is correct. But now I am struggling with replicating that with Transact-SQL.
If I try to replicate that I can only come up with the following TSQL script, which obviously does not fully look like the original.
SELECT 'UNLIMITED' as 'ART_TAG1'
, 'Data_Entry' as 'ART_TAG2/ART_TAG3'
FOR XML PATH(''), ROOT('root')
<root>
<ART_TAG1>UNLIMITED</ART_TAG1>
<ART_TAG2>
<ART_TAG3>Data_Entry</ART_TAG3>
</ART_TAG2>
</root>
If I get this correctly, your question is:
How can I put my query to create those <SomeElement /> tags?
Look at this:
--This will create filled nodes
SELECT 'outer' AS [OuterNode/#attr]
,'inner' AS [OuterNode/InnerNode]
FOR XML PATH('row');
--The empty string is some kind of content
SELECT 'outer' AS [OuterNode/#attr]
,'' AS [OuterNode/InnerNode]
FOR XML PATH('row');
--the missing value (NULL) is omited by default
SELECT 'outer' AS [OuterNode/#attr]
,NULL AS [OuterNode/InnerNode]
FOR XML PATH('row');
--Now check what happens here:
--First XML has an empty element, while the second uses the self-closing element
DECLARE #xml1 XML=
N'<row>
<OuterNode attr="outer">
<InnerNode></InnerNode>
</OuterNode>
</row>';
DECLARE #xml2 XML=
N'<row>
<OuterNode attr="outer">
<InnerNode/>
</OuterNode>
</row>';
SELECT #xml1,#xml2;
The result is the same for both...
Some background: Semantically the empty element <element></element> is exactly the same as the self-closing element <element />. It should not make any difference, whether you use the one or the other. If your consumer cannot deal with this, it is a problem in the reading part.
Yes, you can force any content into XML on string level, but - as the example shows above - this is just a (dangerous) hack.
XML within T-SQL returns - by default - a missing node as NULL and an empty element as empty (depending on the datatype, and beware of the difference between an element and its text() node).
In short: This is nothing you should have to think about...
I know how to replace element value for the xml element in the modify() method. Here's the example
TSQL Replace value in XML String
My problem is a bit different. Taking example from above link...
UPDATE dbo.TFS_Feedback_New
SET Details.modify('
replace value of (/optional/educational/text())[1]
with sql:variable("#updatedEducation")')
WHERE feedbackID = #FBID
What I want to do is provide value for 'educational'. In other words I want to do something like this
UPDATE dbo.TFS_Feedback_New
SET Details.modify('
replace value of (/optional/sql:variable("#name")/text())[1]
with sql:variable("#value")')
WHERE feedbackID = #FBID
I'm getting the following error because of sql:variable("#name")
The XQuery syntax '/function()' is not supported.
How can I pass both the name of the element to be updated and its value to my
stored procedure and have it update the XML column?
You are not allowed to use variables as part of the XPath, but you can use a predicate:
DECLARE #xml XML=
N'<root>
<optional>
<educational>SomeText</educational>
<someOther>blah</someOther>
</optional>
</root>';
--The straight approach as you know it:
SET #xml.modify('replace value of (/root/optional/educational/text())[1] with "yeah!"');
SELECT #xml;
--Now we use a variable to find the first node below <optional>, which name is as given:
DECLARE #ElementName VARCHAR(100)='educational';
SET #xml.modify('replace value of (/root/optional/*[local-name()=sql:variable("#ElementName")]/text())[1] with "yeah again!"');
SELECT #xml;
Try it out...
I am trying to use XQuery in SQL Server 2005 to update xml saved in a column. Here is a sample of the data I need to update.
<Length>3</Length>
<Width>5</Width>
<Depth>6</Depth>
<Area xsi:nil="true" />
<Volume xsi:nil="true" />
I need to set the area and volume to values from a different table. I am creating a CTE for the update. There is other logic that I have omitted, but I have verified that the CTE contains the correct data for the update:
;with Volume (DocumentID, Volume) As
(
Select DocumentID, Volume from tbl
)
and I am using the following XQuery SQL statement to try to update the table.
UPDATE tbl_Archive
SET XML.modify(' declare namespace x="http://www.redacted.com";
replace value of (/x:Document/x:Volume/text())[1]
with sql:column("Volume.Volume")')
From Volume where volume.documentID = tbl_Archive.DocumentID
I get 1 row affected, but when I look at the XML it hasn't changed, and I can't figure out what needs to be fixed to make it work. The node is untyped, if that makes any difference.
Update wont work if there's no text to replace.. the XPath /x:Document/x:Volume/text())[1] will return an empty set.
Try insert...
UPDATE tbl_Archive
SET XML.modify(' declare namespace x="http://www.redacted.com";
insert text {sql:column("Volume.Volume")}
as first into (/x:Document/x:Volume)[1]')
From Volume where volume.documentID = tbl_Archive.DocumentID
..you'll then need to remove the nil="true" attribute..
Something like this maybe..
update tbl_Archive set XML.modify('delete /*:Document/*:Volume[text()]/#xsi:nil')
Update: giving a much more thorough example.
The first two solutions offered were right along the lines of what I was trying to say not to do. I can't know location, it needs to be able to look at the whole document tree. So a solution along these lines, with /Books/ specified as the context will not work:
SELECT x.query('.') FROM #xml.nodes('/Books/*[not(#ID) or #ID = 5]') x1(x)
Original question with better example:
Using SQL Server 2005's XQuery implementation I need to select all nodes in an XML document, just once each and keeping their original structure, but only if they are missing a particular attribute, or that attribute has a specific value (passed in by parameter). The query also has to work on the whole XML document (descendant-or-self axis) rather than selecting at a predefined depth.
That is to say, each individual node will appear in the resultant document only if it and every one of its ancestors are missing the attribute, or have the attribute with a single specific value.
For example:
If this were the XML:
DECLARE #Xml XML
SET #Xml =
N'
<Library>
<Novels>
<Novel category="1">Novel1</Novel>
<Novel category="2">Novel2</Novel>
<Novel>Novel3</Novel>
<Novel category="4">Novel4</Novel>
</Novels>
<Encyclopedias>
<Encyclopedia>
<Volume>A-F</Volume>
<Volume category="2">G-L</Volume>
<Volume category="3">M-S</Volume>
<Volume category="4">T-Z</Volume>
</Encyclopedia>
</Encyclopedias>
<Dictionaries category="1">
<Dictionary>Webster</Dictionary>
<Dictionary>Oxford</Dictionary>
</Dictionaries>
</Library>
'
A parameter of 1 for category would result in this:
<Library>
<Novels>
<Novel category="1">Novel1</Novel>
<Novel>Novel3</Novel>
</Novels>
<Encyclopedias>
<Encyclopedia>
<Volume>A-F</Volume>
</Encyclopedia>
</Encyclopedias>
<Dictionaries category="1">
<Dictionary>Webster</Dictionary>
<Dictionary>Oxford</Dictionary>
</Dictionaries>
</Library>
A parameter of 2 for category would result in this:
<Library>
<Novels>
<Novel category="2">Novel2</Novel>
<Novel>Novel3</Novel>
</Novels>
<Encyclopedias>
<Encyclopedia>
<Volume>A-F</Volume>
<Volume category="2">G-L</Volume>
</Encyclopedia>
</Encyclopedias>
</Library>
I know XSLT is perfectly suited for this job, but it's not an option. We have to accomplish this entirely in SQL Server 2005. Any implementations not using XQuery are fine too, as long as it can be done entirely in T-SQL.
It's not clear for me from your example what you're actually trying to achieve. Do you want to return a new XML with all the nodes stripped out except those that fulfill the condition? If yes, then this looks like the job for an XSLT transform which I don't think it's built-in in MSSQL 2005 (can be added as a UDF: http://www.topxml.com/rbnews/SQLXML/re-23872_Performing-XSLT-Transforms-on-XML-Data-Stored-in-SQL-Server-2005.aspx).
If you just need to return the list of nodes then you can use this expression:
//Book[not(#ID) or #ID = 5]
but I get the impression that it's not what you need. It would help if you can provide a clearer example.
Edit: This example is indeed more clear. The best that I could find is this:
SET #Xml.modify('delete(//*[#category!=1])')
SELECT #Xml
The idea is to delete from the XML all the nodes that you don't need, so you remain with the original structure and the needed nodes. I tested with your two examples and it produced the wanted result.
However modify has some restrictions - it seems you can't use it in a select statement, it has to modify data in place. If you need to return such data with a select you could use a temporary table in which to copy the original data and then update that table. Something like this:
INSERT INTO #temp VALUES(#Xml)
UPDATE #temp SET data.modify('delete(//*[#category!=2])')
Hope that helps.
The question is not really clear, but is this what you're looking for?
DECLARE #Xml AS XML
SET #Xml =
N'
<Books>
<Book ID="1">Book1</Book>
<Book ID="2">Book2</Book>
<Book ID="3">Book3</Book>
<Book>Book4</Book>
<Book ID="5">Book5</Book>
<Book ID="6">Book6</Book>
<Book>Book7</Book>
<Book ID="8">Book8</Book>
</Books>
'
DECLARE #BookID AS INT
SET #BookID = 5
DECLARE #Result AS XML
SET #result = (SELECT #xml.query('//Book[not(#ID) or #ID = sql:variable("#BookID")]'))
SELECT #result