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 Looping and querying data from XML clob
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2 Posts

Posted - 10/05/2013 :  13:11:01  Show Profile  Reply with Quote

Using a code snippet borrowed from a co-worker, I have put together a query that, among other things, pulls a list value out of an xml clob field and displays it in the query results. My query as it stands right now is below, followed by a snippet from the xml clob that I am pulling from.
select * from 
  (Select Wtr_Service_Tag, Wtr_Tran_Origin, Wtr_Send_Date, Wtr_Receive_Date, 
    to_char(substr(wtr_req_xml,instr(substr(wtr_req_xml,1,8000),'SID')+8,12)) Asset_Tag
  from ws_transactions
  Where Wtr_Service_Tag In ('20458749610')
    And Wtr_Req_Xml Like ('%CSM%')
  Order By Wtr_Receive_Date Desc)
where rownum = 1;

<LIST NAME="AssetTag">
 <VALUE SID="1">186037</VALUE>
 <VALUE SID="2">186038</VALUE>

This query is only able to pull the first value in the list.

I have two questions that I am hoping I can get some help with.
    [1]How can I edit this query to pull all of the list items when there are more than 1? I have another field, in a separate table, that I can pull from to get that number.

    [2]This one may be more complex. As currently written, the query pulls a fixed number of characters from the xml clob and either returns not enough data, or too much because the values I need to pull could be of varying lengths. I have no way to query what those lengths might be.

Thank you in advance for your help. I hope I have provided enough information. I have I have not, I will gladly respond back with anything else that is needed.


James K
Flowing Fount of Yak Knowledge

3873 Posts

Posted - 10/06/2013 :  08:31:07  Show Profile  Reply with Quote
Are you using Microsoft SQL Server? If you are not, you might want to post the question in a forum specific to your DBMS provider. This forum is for Microsoft SQL Server. I was going to write a query for you, but then I realized that the "CROSS APPLY" operator that I would be using is not available in some of the other DBMS systems.
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Starting Member

2 Posts

Posted - 10/06/2013 :  13:13:37  Show Profile  Reply with Quote
Thanks James.

I somehow missed that this forum was that specific. We use and oracle database and SQL developer to do our querying.

Sorry the for the intrusion.
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