How to loop through elements in a column of xml datatype in SQL

Question

0.00/5 (No votes)

See more:

I have stored a svg image in SQL column. The column datatype is XML. The xml basically looks something like:

XML

<svg>
  <rect id="1">
    <rect id="in1" stroke="black"/>
    <circle id="in2" />
    <rect id="in3" stroke="black">
      <rect id="31" fill="Red"/>
    </rect>
    <circle id="in4"/>
  </rect>

 <g>
  <rect id="2">
    <circle>
     <rect id="in5">
  </rect>
 </g>
</svg>

How to loop through the xml in SQL so that I can find the correct <rect> tag with id 31 and change its fill color to "Blue"

Posted 9-Jul-15 21:23pm

Anjali0904

Updated 9-Jul-15 21:37pm

Suvendu Shekhar Giri

v4

Add a Solution

Comments

Anjali0904 21-Jul-15 5:42am

Supposing the attribute is
<rect id="31" style="opacity:1;fill:#000fff;fill-stroke:#fffff"/>
</rect>
How do I change the value of fill now?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Wendelius · Accepted Answer · 2015-07-09T21:49:00

Solution 1

You can use replace value of[^].

So something like the following:

SQL

DECLARE @data xml;
SET @data = '<svg>
  <rect id="1">
    <rect id="in1" stroke="black" />
    <circle id="in2" />
    <rect id="in3" stroke="black">
      <rect id="31" fill="Red" />
    </rect>
    <circle id="in4" />
  </rect>
 
 <g>
  <rect id="2">
    <circle>
     <rect id="in5" />
    </circle>
  </rect>
 </g>
</svg>';

SELECT @data;

SET @data.modify('
  replace value of (//rect[@id=("31")]/@fill)[1]
  with "blue"
');
SELECT @data;

Posted 9-Jul-15 21:49pm

Wendelius

Comments

Anjali0904 20-Jul-15 2:09am

Hey Thanks Mika...
I have one more doubt. Is it possible to update multiple values at the same time...say change fill to blue of rect with id 31 and 32??

Wendelius 20-Jul-15 3:40am

As far as I know you can't update multiple values at the same time. So you would need a loop of some kind. For example


DECLARE @counter int = 31 

WHILE @counter <= 32 BEGIN
   SET @data.modify('
      replace value of (//rect[@id = (sql:variable("@counter"))]/@fill)[1]
     with "blue"
   ');
   SET @counter = @counter + 1
END

Anjali0904 21-Jul-15 2:05am

Oh okk..Thanks once again Mika..

Wendelius 21-Jul-15 3:03am

You're welcome :)

Anjali0904 21-Jul-15 6:03am

Supposing the attribute is
<rect id="31" style="opacity:1;fill:#000fff;fill-stroke:#fffff"/>
</rect>
How do I change the value of fill now?

Wendelius 21-Jul-15 7:17am

I guess you should pull out the text to a variable and then modify the string and put it back. The same idea as in the loop.

However, I can't see any reason why a single attribute should contain more than one information. To keep the life simple, I'd split them to separate attributes.

Anjali0904 21-Jul-15 7:37am

Ya..thats what I did eventually.
Actually I am storing a svg image as xml. The generated svg that I presently have, has all information pertaining to style in its style attribute.