How to reference field names with variable in Firebird stored procedure or execution block

Question

Please give me an example how to reference field names with variable in a Firebird stored procedure or execute block

Something like this pseudo SQL:

Answer 1

It's still not quite clear to me what you want to achieve, but in the PSQL there is also EXECUTE STATEMENT feature available which might suit your needs - it allows you to buid a string and then execute it as a DSQL statement... Assuming the var_loop in your example is integer your code might be something like

CREATE PROCEDURE Foo(var_loop INTEGER)
AS
DECLARE Stmnt VARCHAR(1024);
BEGIN
  Stmnt = 'Insert into tab1 (1, f1, f2, f3)'||
          'select 1, tab2.f'|| CAST(var_loop AS VARCHAR(10)) ||
          ', tab2.f'|| CAST(var_loop AS VARCHAR(10)) ||
          ', tab2.f'|| CAST(var_loop AS VARCHAR(10)) ||
          'from tab2 where(...)';
  EXECUTE STATEMENT Stmnt;
END^