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HomeHomeDevelopment and...Development and...SQL and SQL Ser...SQL and SQL Ser...Deleting/Administering Taxonomy via SQLDeleting/Administering Taxonomy via SQL
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1/26/2015 3:27 PM
 
Amanda Thomas


Joined: 3/29/2011
Posts: 4

 

Several months ago I made the error of trying to administer Taxonomies via SQL. I wanted to change the parent terms in a complex hierarchical taxonomy very quickly, but now realize it was not a good idea.

I want to start over, but am now unable to delete one this custom hierarchical Taxonomy vocabularies and all the terms it contains. 
Nothing happens when I click Delete going through the DNN web admin interface. 

I also tried to delete it using SQL: 

delete from Taxonomy_Vocabularies 
where VocabularyID = 8 

delete from Taxonomy_Terms 
where VocabularyID = 8 

but get this error (on both queries): 

Msg 547, Level 16, State 0, Line 1 
The DELETE statement conflicted with the SAME TABLE REFERENCE constraint "FK_Taxonomy_Terms_Taxonomy_Terms". The conflict occurred in database "DNN7", table "dbo.Taxonomy_Terms", column 'ParentTermID'. 
The statement has been terminated. 

I tried making a test Taxonomy and was able to delete it just fine, using website or SQL. So it must just be this one that I tinkered with from the back end. How can I get rid of it?
 
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1/27/2015 1:33 AM
 
Mitchel Sellers


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www.mitchelsellers.com
Joined: 1/24/2007
Posts: 7846
The error that you are getting here is due to a same table reference to a record that is going wrong.

Your query is trying to delete an item with a ParentTermId value that is being used by other terms. As such, this is failing as there is a FK dependency.

YOU MIGHT Be able to do something like this

DELETE FROM Taxonomy_Terms
WHERE VocabularyId = 8 AND ParentTermId IS NULL

Then a second delete that matched your initial.

NOTE: Use at your own risk, the above is general SQL information based on the FK error that you have. NOT from full validation with DNN tables.
-Mitchel Sellers
Microsoft MVP, ASPInsider, DNN MVP
CEO/Director of Development - IowaComputerGurus Inc.
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1/27/2015 6:06 AM
 
Sebastian Leupold


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www.dnnwerk.de
Joined: 3/8/2004
Posts: 46212
I would assume, the an item with parentTerm = Null is the root item, which cannot be deleted as long as there are childs.
You need to delete child items first, the statement would be:
DELETE FROM Taxonomy_Terms
WHERE VocabularyId = 8
AND TermID NOT IN (SELECT DISTINCT ParentTerms FROM Taxonomy_Terms WHERE VocabularyId = 8)
Cheers from Germany,
Sebastian Leupold

dnnWerk - The DotNetNuke Experts   German Spoken DotNetNuke User Group

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1/28/2015 11:17 AM
 
Amanda Thomas


Joined: 3/29/2011
Posts: 4
I see now. I was able to use SQL to delete all the lowest-level children, then parents, grandparents, so forth. Thanks!

But now I'm left with one term that was a parent over EVERY OTHER term in the vocabulary. And it won't let me delete this last one. Its ParentTermID is NULL.

Msg 547, Level 16, State 0, Line 1
The DELETE statement conflicted with the SAME TABLE REFERENCE constraint "FK_Taxonomy_Terms_Taxonomy_Terms". The conflict occurred in database "DNN7", table "dbo.Taxonomy_Terms", column 'ParentTermID'.
The statement has been terminated.
 
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1/28/2015 4:23 PM
 
Sebastian Leupold


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Joined: 3/8/2004
Posts: 46212
if it is the last one, run:
DELETE FROM Taxonomy_Terms
WHERE VocabularyId = 8
Cheers from Germany,
Sebastian Leupold

dnnWerk - The DotNetNuke Experts   German Spoken DotNetNuke User Group

Speed up your DNN Websites with TurboDNN
 
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