Re: [sqlite] User Defined Function using P/Invoke SQLite wrappers
Rick Guizawa wrote: > > I was wondering if someone could give me a simple straight forward > example of creating user defined function in c# - sqlite application. > I have collected basic ( probably incomplete) P/Invoke SQLite wrapper > functions but I don't know how to include the user defined function > in the wrapper. Thank you very much for any help you could give me. > You may want to look at using System.Data.SQLite: http://system.data.sqlite.org/ It has a SQLiteFunction abstract class that you can derive from. The help file (CHM) for the project has some information on how to use this class, including for the static RegisterFunction method used to actually add the custom functions to the database connection. -- Joe Mistachkin ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] User Defined Function using P/Invoke SQLite wrappers
Hi All, I have an assignment to do statistical processes in C#. I like SQLite stand-alone feature but I need to be able to do the assignment using something like SQL Server stored-procedure. I was wondering if someone could give me a simple straight forward example of creating user defined function in c# - sqlite application. I have collected basic ( probably incomplete) P/Invoke SQLite wrapper functions but I don't know how to include the user defined function in the wrapper. Thank you very much for any help you could give me. Cheers, Rick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] User-defined function invocation during triggers
With the next version of SQLite (which will be released this week) you will be able to write a trigger on deletion of dependent rows where you will just call your function. Pavel On Tue, Oct 13, 2009 at 1:19 PM, Igor Tandetnik wrote: > mwnn wrote: >> i am using triggers to delete dependent rows of a table when a >> referred row is deleted. Is there a way for me to let SQLite call a >> user-defined function for every row deleted in a trigger? > > Well, you could write your trigger like this: > > create trigger ... on delete ... > begin > select mycustomfunction(id) from mytable where condition; > delete from mytable where condition; > end; > > Igor Tandetnik > > > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] User-defined function invocation during triggers
mwnn wrote: > i am using triggers to delete dependent rows of a table when a > referred row is deleted. Is there a way for me to let SQLite call a > user-defined function for every row deleted in a trigger? Well, you could write your trigger like this: create trigger ... on delete ... begin select mycustomfunction(id) from mytable where condition; delete from mytable where condition; end; Igor Tandetnik ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] user defined function
"Aviad Harell" <[EMAIL PROTECTED]> wrote: > Hey Igor, > > Thanks for your replay. I tried not to use user defined function to do it. > This code is working on SqlServer but on SQLite I get misuse of aggregate: > (SUM(SALES)). > See http://www.sqlite.org/cvstrac/tktview?tn=2652 http://www.sqlite.org/cvstrac/chngview?cn=4435 -- D. Richard Hipp <[EMAIL PROTECTED]> - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] User Defined Function vs.Keyword
[EMAIL PROTECTED] wrote:
I tried to use my function with a statement like:
SELECT left('Hallo Du!', 5);
I got: "near "(" : syntax error"
This is - I assume - because LEFT is already a keyword with a special
meaning as stated in http://www.sqlite.org/lang.html#keywords and can
therefore not be used as a function name.
Is that true?
Yes.
--
D. Richard Hipp -- [EMAIL PROTECTED] -- 704.948.4565
