Calling function from VFP changes character field to Memo
Hi, I have a simple table Patients with one field FirstName of type character(30). If I SELECT FirstName From public.patients; I get back the expected character(30) field. If however I have a function defined like this CREATE OR REPLACE FUNCTION public.testfunction( ) RETURNS TABLE ( Firstname character(30) ) LANGUAGE 'plpgsql' AS $BODY$ BEGIN RETURN QUERY SELECT p.cFirstName FROM patients p; END; $BODY$; And I call: SELECT * FROM public.testFunction(); Then FirstName returns as a Memo field (similar to a Text field). Any idea what I need to do to get it to return the character(30) type? -- Frank. Frank Cazabon
Re: Calling function from VFP changes character field to Memo
On 15/11/2022 2:48 pm, Adrian Klaver wrote: On 11/15/22 10:43 AM, Frank Cazabon wrote: Please reply to list als. Ccing list Sorry about that, first time using this list and just assumed I was replying to the list and the list would then notify you SELECT * FROM public.testFunction(); SELECT firstname from FROM public.testFunction(); This has the same result. How about?: SELECT firstname::varchar(30) from FROM public.testFunction(); That does work, thanks, but it may cause me some logic problems in the rest of the code. I'll try the type suggestion from Tom and see if that works and then decide which is my best approach. Thanks Then FirstName returns as a Memo field (similar to a Text field). Any idea what I need to do to get it to return the character(30) type?
Re: Calling function from VFP changes character field to Memo
On 15/11/2022 2:44 pm, Tom Lane wrote: Frank Cazabon writes: If however I have a function defined like this CREATE OR REPLACE FUNCTION public.testfunction( ) RETURNS TABLE ( Firstname character(30) ) LANGUAGE 'plpgsql' AS $BODY$ BEGIN RETURN QUERY SELECT p.cFirstName FROM patients p; END; $BODY$; And I call: SELECT * FROM public.testFunction(); Then FirstName returns as a Memo field (similar to a Text field). This is mostly about whatever software stack you're using on the client side --- Memo is certainly not something Postgres knows about. Any idea what I need to do to get it to return the character(30) type? There's no chance of getting back the "30" part with this structure, because function signatures do not carry length restrictions. What I expect is happening is that you get firstname as an unspecified-length "character" type, and something on the client side is deciding to cope with that by calling it "Memo" instead. You could perhaps work around that by defining a named composite type: create type testfunction_result as (firstname character(30), ...); create function testfunction() returns setof testfunction_result as ... regards, tom lane Thanks, so I could define the function like this - removed the (30): CREATE OR REPLACE FUNCTION public.testfunction( ) RETURNS TABLE ( Firstname character ) LANGUAGE 'plpgsql' I'll try the type definition and see if that helps.
Re: Calling function from VFP changes character field to Memo
I don't think that's necessary, I'm 100% certain that it's VFP not able to interpret the size of what is coming back to it so it just gives it the biggest type it can. Thanks 15 Nov 2022 14:59:59 Ron : > On 11/15/22 12:54, Frank Cazabon wrote: >> >> On 15/11/2022 2:44 pm, Tom Lane wrote: >>> Frank Cazabon writes: >>>> If however I have a function defined like this >>>> CREATE OR REPLACE FUNCTION public.testfunction( >>>> ) >>>> RETURNS TABLE >>>> ( >>>> Firstname character(30) >>>> ) >>>> LANGUAGE 'plpgsql' >>>> AS $BODY$ >>>> BEGIN >>>> RETURN QUERY SELECT p.cFirstName FROM patients p; >>>> END; >>>> $BODY$; >>>> And I call: >>>> SELECT * FROM public.testFunction(); >>>> Then FirstName returns as a Memo field (similar to a Text field). >>> This is mostly about whatever software stack you're using on the >>> client side --- Memo is certainly not something Postgres knows about. >>> >>>> Any idea what I need to do to get it to return the character(30) type? >>> There's no chance of getting back the "30" part with this structure, >>> because function signatures do not carry length restrictions. >>> What I expect is happening is that you get firstname as an >>> unspecified-length "character" type, and something on the client >>> side is deciding to cope with that by calling it "Memo" instead. >>> >>> You could perhaps work around that by defining a named composite >>> type: >>> >>> create type testfunction_result as (firstname character(30), ...); >>> >>> create function testfunction() returns setof testfunction_result as ... >>> >>> regards, tom lane >> Thanks, so I could define the function like this - removed the (30): >> >> CREATE OR REPLACE FUNCTION public.testfunction( >> ) >> RETURNS TABLE >> ( >> Firstname character >> ) >> LANGUAGE 'plpgsql' >> >> I'll try the type definition and see if that helps. > > I think you should try the original function in psql. That will delineate > Postgresql from framework. > > -- > Angular momentum makes the world go 'round.
Re: Calling function from VFP changes character field to Memo
On 15/11/2022 2:58 pm, Adrian Klaver wrote: On 11/15/22 10:54 AM, Frank Cazabon wrote: On 15/11/2022 2:44 pm, Tom Lane wrote: Frank Cazabon writes: If however I have a function defined like this CREATE OR REPLACE FUNCTION public.testfunction( ) RETURNS TABLE ( Firstname character(30) ) LANGUAGE 'plpgsql' AS $BODY$ BEGIN RETURN QUERY SELECT p.cFirstName FROM patients p; END; $BODY$; And I call: SELECT * FROM public.testFunction(); Then FirstName returns as a Memo field (similar to a Text field). This is mostly about whatever software stack you're using on the client side --- Memo is certainly not something Postgres knows about. Any idea what I need to do to get it to return the character(30) type? There's no chance of getting back the "30" part with this structure, because function signatures do not carry length restrictions. What I expect is happening is that you get firstname as an unspecified-length "character" type, and something on the client side is deciding to cope with that by calling it "Memo" instead. You could perhaps work around that by defining a named composite type: create type testfunction_result as (firstname character(30), ...); create function testfunction() returns setof testfunction_result as ... regards, tom lane Thanks, so I could define the function like this - removed the (30): CREATE OR REPLACE FUNCTION public.testfunction( ) RETURNS TABLE ( Firstname character ) LANGUAGE 'plpgsql' No you don't want to do that: select 'test'::char; bpchar t vs select 'test'::varchar; varchar - test Besides you missed the important part, after creating the type testfunction_result: create function testfunction() returns setof testfunction_result as ... Sorry about the confusion, I have got it working using the type definition. Thanks for the help I'll try the type definition and see if that helps.
