Update(Replace partcial value) XML Column in SQL - sql

Question

I have an XML column in my Table and i wanted to replace particular text wherever it appear in that column with a new text. Here is the xml structure,
<Story>
<StoryNonText>
<NonText>
<ImageID>1</ImageID>
<Src>http://staging.xyz.com/FolderName/1.png</Src>
</NonText>
<NonText>
<ImageID>2</ImageID>
<Src>http://staging.xyz.com/FolderName/2.png</Src>
</NonText>
</StoryNonText>
</Story>
In the above XML I wanted to replace all the <Src> values having http://staging.xyz.com/ to http://production.xyz.com/. Please guide me how i can do this!

Answer 1

You can use Replace() function as below:
Update TableName
SET
ColumnName=replace(CAST(ColumnName AS VARCHAR(8000)),'<Src>http://staging.xyz.com/','<Src>http://production.xyz.com/')

Answer 2

With a little help from a couple of XML functions you can do this in a loop.
The loop is necessary since replace value of can only replace one value at a time. This code assumes the URL is located first in the node and not embedded in text anywhere.
declare #T table(X xml);
insert into #T(X) values('<Story>
<StoryNonText>
<NonText>
<ImageID>1</ImageID>
<Src>http://staging.xyz.com/FolderName/1.png</Src>
</NonText>
<NonText>
<ImageID>2</ImageID>
<Src>http://staging.xyz.com/FolderName/2.png</Src>
</NonText>
</StoryNonText>
</Story> ');
declare #FromURL nvarchar(100);
declare #ToURL nvarchar(100);
set #FromURL = 'http://staging.xyz.com/';
set #ToURL = 'http://production.xyz.com/';
while 1 = 1
begin
update #T
set X.modify('replace value of (//*/text()[contains(., sql:variable("#FromURL"))])[1]
with concat(sql:variable("#ToURL"), substring((//*/text()[contains(., sql:variable("#FromURL"))])[1], string-length(sql:variable("#FromURL"))+1))')
where X.exist('//*/text()[contains(., sql:variable("#FromURL"))]') = 1;
if ##rowcount = 0
break;
end;
select *
from #T
replace value of (XML DML)
concat Function (XQuery)
contains Function (XQuery)
string-length Function (XQuery)
sql:variable() Function (XQuery)

Answer 3

There are many ways to do that.
The first way is to add a WHILE loop. Inside a loop, you search (CHARINDEX) for a position of first tag and first tag. Then, knowing the start and end positions, replace the value. Then on the next iteration you search again, but change starting position in CHARINDEX() function
The second way is to use SELECT ... FROM OPENXML + EXEC sp_xml_preparedocument