[firebird-support] Re: EXECUTE STATEMENT ON EXTERNAL 'ODBC://odbc_datasource_name'
30.08.2014 14:25, bert_herngr...@yahoo.com wrote: Should the Execute statement work on an ODBC datasource already with FB 3.0? No. The ability to access foreign database engines using providers should not be overlooked, either. It might seem strange to consider this, given the number of tools available for this sort of task. Think about the ability to access other Firebird databases using EXECUTE STATEMENT, that became available in Firebird 2.5. With a provider to ODBC or other common tool to access various data sources it is within reach to use EXECUTE STATEMENT to get direct access from procedures and triggers, to data from any database having a driver for the chosen access tool. There are no providers developed for ODBC yet. Dmitry
Re: [firebird-support] Re: execute statement
Alexandre Benson Smith wrote: To achieve what he wants he will need to write an app (or stored procedure, or whatever) that loops trough the fields and generate the trigger PSQL code like No need to write anything. In FlameRobin, you can right-click the table, select Generate code and then Create change trigger for table. It will display a dialog to select the desired columns and it will generate to complete trigger code. HTH -- Milan Babuskov == The easiest way to import XML, CSV and textual files into Firebird: http://www.guacosoft.com/xmlwizard ==
[firebird-support] Re: execute statement
EXECUTE STATEMENT is for executing queries only, your code is not just a query as it contains an IF statement. I think for your purposes you need to use EXECUTE BLOCK http://www.firebirdsql.org/file/documentation/reference_manuals/reference_material/html/langrefupd25-execblock.html Thanks Mark! Yes... I've been reading it before, but I didn't found any example similar of what I want to do... Perhaps is no possible at all? Anyway, I was inspired in a firebird FAQ http://www.firebirdfaq.org/faq133/
Re: [firebird-support] Re: execute statement
On 9-8-2012 22:13, Sergio wrote: EXECUTE STATEMENT is for executing queries only, your code is not just a query as it contains an IF statement. I think for your purposes you need to use EXECUTE BLOCK http://www.firebirdsql.org/file/documentation/reference_manuals/reference_material/html/langrefupd25-execblock.html Thanks Mark! Yes... I've been reading it before, but I didn't found any example similar of what I want to do... Perhaps is no possible at all? I think you need to create an EXECUTE BLOCK statement as text and then execute that using EXECUTE STATEMENT, however I am not actually sure if that would give you access to the NEW and OLD context tables. Anyway, I was inspired in a firebird FAQ http://www.firebirdfaq.org/faq133/ That is more an example of how you can use a query to write the trigger code, but the result of that query will still be the normal code inside the trigger. Mark -- Mark Rotteveel
Re: [firebird-support] Re: execute statement
Em 9/8/2012 17:19, Mark Rotteveel escreveu: I think you need to create an EXECUTE BLOCK statement as text and then execute that using EXECUTE STATEMENT, however I am not actually sure if that would give you access to the NEW and OLD context tables. Mark There is no way to access NEW and OLD context variables inside EXECUTE STATEMENT. To achieve what he wants he will need to write an app (or stored procedure, or whatever) that loops trough the fields and generate the trigger PSQL code like CREATE OR ALTER trigger tlm_maestro_au0 for tlm_maestro active after update position 0 AS declare variable loc_nuevo_id id; declare variable loc_ejecutar descripcion_larga; begin loc_nuevo_id = gen_id(gen_tlm_maestro_hist,1); insert into tlm_maestro_hist (id,modificado) values (:loc_nuevo_id, current_timestamp); IF (new.Field1 is distinct from old.Field1) then update tlm_maestro_hist set Field1 = old.Field1 where ID = :Loc_Nuevo_ID; IF (new.Field2 is distinct from old.Field2) then update tlm_maestro_hist set Field2 = old.Field2 where ID = :Loc_Nuevo_ID; IF (new.Field3 is distinct from old.Field3) then update tlm_maestro_hist set Field3 = old.Field3 where ID = :Loc_Nuevo_ID; end
