If you are using Fb 2.5, you can use this alternative syntax: ... declare variable fname varchar(31); ... i = 1; stmtxt = 'select 1 from rdb$database where exists(SELECT * FROM RDB$RELATION_FIELDS WHERE RDB$RELATION_NAME = 'T_DT' and RDB$FIELD_NAME = ''' || :fvalue || ''';
while (i< 7) do begin fname = case when i = 1 then f1 when i = 2 then f2 -- etcetera end /* SHOULD NOT BE HERE '*/ F' || cast (i as char); idexists = 0; execute statement (stmtxt) (fvalue := fname) into :idexists; if(idexists = 0) then begin --. break; end i = i + 1; end ./hb
