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;
Related
Im working on a script that will allow me to save the xml data in a table. This will be used to compare with other tables which also contains an xml data.
I've been successful so far for simple node tags, but have encountered an issue when trying to store the data from a list.
The XML data looks like this:Sample XML Data
And my query is this:
XML Query display
I am able to get the 'TypeCode' as the main node but for the value, it's always showing blank. I'm not sure how to handle the list in XML.
I'm thinking as long as I can save the data
''
'' as text in the Value column, then I can find another way to parse it and display it in a nicer way as another query.
Any help is appreciated :D Thanks!
For your next question: Please do not post pictures. I had to type this in... Please provide consumable data, best as a stand-alone example to reproduce your issue.
DECLARE #xml XML=
'<Codes>
<TypeCodes type="list">
<item key="A" text="A1"/>
<item key="C" text="C1"/>
</TypeCodes>
</Codes>';
--the Xml "as is"
SELECT #xml;
--fetch one value with XQuery
SELECT #xml.value('(/Codes/TypeCodes/item[#key="A"]/#text)[1]','varchar(10)');
--fetch all items as list
SELECT #xml.value('(/Codes/TypeCodes/#type)[1]','varchar(10)') AS TypeCode_type
,i.value('#key','varchar(10)') AS item_key
,i.value('#text','varchar(10)') AS item_text
FROM #xml.nodes('/Codes/TypeCodes/item') A(i);
check it out
Good day,
SQL Server include special data type XML which is what you should use in order to store your XML data.
declare #MyXML XML = '
<codes>
<Type>
<Item key="1" />
</Type>
</codes>
'
select #MyXML
Here is example of using table:
DROP TABLE IF eXISTS T;
CREATE TABLE T(MyXML XML)
GO
INSERT T(MyXML) values ('
<codes>
<Type>
<Item key="1" />
</Type>
</codes>
')
SELECT * FROM T
GO
For more information check this documentation:
XML Data Type and Columns (SQL Server)
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')
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])
I want to generate some XML in a stored procedure based on data in a table.
The following insert allows me to add many nodes but they have to be hard-coded or use variables (sql:variable):
SET #MyXml.modify('
insert
<myNode>
{sql:variable("#MyVariable")}
</myNode>
into (/root[1]) ')
So I could loop through each record in my table, put the values I need into variables and execute the above statement.
But is there a way I can do this by just combining with a select statement and avoiding the loop?
Edit I have used SELECT FOR XML to do similar stuff before but I always find it hard to read when working with a hierarchy of data from multiple tables. I was hoping there would be something using the modify where the XML generated is more explicit and more controllable.
Have you tried nesting FOR XML PATH scalar valued functions?
With the nesting technique, you can brake your SQL into very managable/readable elemental pieces
Disclaimer: the following, while adapted from a working example, has not itself been literally tested
Some reference links for the general audience
http://msdn2.microsoft.com/en-us/library/ms178107(SQL.90).aspx
http://msdn2.microsoft.com/en-us/library/ms189885(SQL.90).aspx
The simplest, lowest level nested node example
Consider the following invocation
DECLARE #NestedInput_SpecificDogNameId int
SET #NestedInput_SpecificDogNameId = 99
SELECT [dbo].[udfGetLowestLevelNestedNode_SpecificDogName]
(#NestedInput_SpecificDogNameId)
Let's say had udfGetLowestLevelNestedNode_SpecificDogName had been written without the FOR XML PATH clause, and for #NestedInput_SpecificDogName = 99 it returns the single rowset record:
#SpecificDogNameId DogName
99 Astro
But with the FOR XML PATH clause,
CREATE FUNCTION dbo.udfGetLowestLevelNestedNode_SpecificDogName
(
#NestedInput_SpecificDogNameId
)
RETURNS XML
AS
BEGIN
-- Declare the return variable here
DECLARE #ResultVar XML
-- Add the T-SQL statements to compute the return value here
SET #ResultVar =
(
SELECT
#SpecificDogNameId as "#SpecificDogNameId",
t.DogName
FROM tblDogs t
FOR XML PATH('Dog')
)
-- Return the result of the function
RETURN #ResultVar
END
the user-defined function produces the following XML (the # signs causes the SpecificDogNameId field to be returned as an attribute)
<Dog SpecificDogNameId=99>Astro</Dog>
Nesting User-defined Functions of XML Type
User-defined functions such as the above udfGetLowestLevelNestedNode_SpecificDogName can be nested to provide a powerful method to produce complex XML.
For example, the function
CREATE FUNCTION [dbo].[udfGetDogCollectionNode]()
RETURNS XML
AS
BEGIN
-- Declare the return variable here
DECLARE #ResultVar XML
-- Add the T-SQL statements to compute the return value here
SET #ResultVar =
(
SELECT
[dbo].[udfGetLowestLevelNestedNode_SpecificDogName]
(t.SpecificDogNameId)
FROM tblDogs t
FOR XML PATH('DogCollection') ELEMENTS
)
-- Return the result of the function
RETURN #ResultVar
END
when invoked as
SELECT [dbo].[udfGetDogCollectionNode]()
might produce the complex XML node (given the appropriate underlying data)
<DogCollection>
<Dog SpecificDogNameId="88">Dino</Dog>
<Dog SpecificDogNameId="99">Astro</Dog>
</DogCollection>
From here, you could keep working upwards in the nested tree to build as complex an XML structure as you please
CREATE FUNCTION [dbo].[udfGetAnimalCollectionNode]()
RETURNS XML
AS
BEGIN
DECLARE #ResultVar XML
SET #ResultVar =
(
SELECT
dbo.udfGetDogCollectionNode(),
dbo.udfGetCatCollectionNode()
FOR XML PATH('AnimalCollection'), ELEMENTS XSINIL
)
RETURN #ResultVar
END
when invoked as
SELECT [dbo].[udfGetAnimalCollectionNode]()
the udf might produce the more complex XML node (given the appropriate underlying data)
<AnimalCollection>
<DogCollection>
<Dog SpecificDogNameId="88">Dino</Dog>
<Dog SpecificDogNameId="99">Astro</Dog>
</DogCollection>
<CatCollection>
<Cat SpecificCatNameId="11">Sylvester</Cat>
<Cat SpecificCatNameId="22">Tom</Cat>
<Cat SpecificCatNameId="33">Felix</Cat>
</CatCollection>
</AnimalCollection>
Use sql:column instead of sql:variable. You can find detailed info here: http://msdn.microsoft.com/en-us/library/ms191214.aspx
Can you tell a bit more about what exactly you are planning to do.
Is it simply generating XML data based on a content of the table
or adding some data from the table to an existing xml structure?
There are great series of articles on the subject on XML in SQLServer written by Jacob Sebastian, it starts with the basics of generating XML from the data in the table
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