Hello,
I have 3 tables, Tags, ArticlesTags and FilesTags, with the following
columns:
Tags TagID, Text
ArticlesTags TagID, ArticleID
FilesTags TagID, FileID
I need to delete all records in Tags which are not in ArticlesTags and
FilesTags.
If a Tag is present in one of the 2 tables, ArticlesTags or FilesTags,
then it will not be deleted.
How would I do this?
Thanks,
Miguel
3  2172 
Just a thought - in this scenario, you aren't really interested in the
fields of the things you are deleting, so I wouldn't bother feftching
them from the database (which will be necessary [or at the least, all
the PKs of such] if you want LINQ to delete them).
If this was me, I'd write a stored procedure that used a few NOT
EXISTS checks, and drag the SP into LINQ (juts to simplify the calling
mechanism).
LINQ is a great tool, but you can mix-and-match generated code and SPs
so that each does things it is good at.
Marc
On Mar 7, 4:56 am, Marc Gravell <marc.grav...@g mail.comwrote:
Just a thought - in this scenario, you aren't really interested in the
fields of the things you are deleting, so I wouldn't bother feftching
them from the database (which will be necessary [or at the least, all
the PKs of such] if you want LINQ to delete them).
If this was me, I'd write a stored procedure that used a few NOT
EXISTS checks, and drag the SP into LINQ (juts to simplify the calling
mechanism).
LINQ is a great tool, but you can mix-and-match generated code and SPs
so that each does things it is good at.
Marc
Hi,
I know ... but in this moment I would like to use only Linq for
this ...
.... later I will probably use a SP.
I came up with:
Dim database As New CodeDataContext
Dim tags = From t In database.Tags _
Where Not (t.FilesTags.An y Or t.ArticlesTags. Any) _
Select t
database.Tags.D eleteAllOnSubmi t(tags)
database.Submit Changes()
It is working. Just one question:
What do you mean with getting only the ID?
How do I do that in my code?
Thanks,
Miguel
P.S: Sorry for my VB.NET code but I am more used to is and it is
faster for me.
When will converters work also with Linq code?
What do you mean with getting only the ID?
How do I do that in my code?
I don't know if it is possible; but it would be theoretical bare-minimum to
perform a delete...
But I stress; if it was me, I wouldn't be getting the data out of the
database...
Marc This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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last post by:
Hello people:
First of all forgiveness for my English.
I am working with Linq to SQL, Visual Studio 2008 and SQL Server 2000.
When you delete a record and then go back to Insert (ie, insert a record
with the same primary key)
and I run SubmitChange it generates an key duplicate exception.
I am reviewing the SQL commands generated by linq, and I see that attempts
to run
first insert command, and then delete command.
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