Обсуждение: Dynamic binding issue
Hello guys,
I'm a problem with dynamic sql.
I am trying to write a generic function that is able to read and update a table based on some data coming from e previous record.
Here the example
_sqlStr=format('select *
from %1$s.%2$s
where (' || array_to_string(_activeRec.pk_columns_list, ',') || ') in (select ' ||
'row($1[''' || array_to_string(_activeRec.pk_columns_list, '''],$1[''') || ''']))'
, _activeRec.name_of_schema, _activeRec.main_table);
execute _sqlStr using oldRec into _rec;
from %1$s.%2$s
where (' || array_to_string(_activeRec.pk_columns_list, ',') || ') in (select ' ||
'row($1[''' || array_to_string(_activeRec.pk_columns_list, '''],$1[''') || ''']))'
, _activeRec.name_of_schema, _activeRec.main_table);
execute _sqlStr using oldRec into _rec;
My problem is oldRec is a type record, so the substitution performed by execute fails, because it can't recognize the field if the variable is record and not a specific composite record type.
I suppose this is a recurrent question, but I can't find a solution...
Domenico L.
On 6/12/23 15:13, Lorusso Domenico wrote:
> Hello guys,
> I'm a problem with dynamic sql.
> I am trying to write a generic function that is able to read and update
> a table based on some data coming from e previous record.
> Here the example
> _sqlStr=format('select *
> from %1$s.%2$s
> where (' || array_to_string(_activeRec.pk_columns_list, ',') || ') in
> (select ' ||
> 'row($1[''' || array_to_string(_activeRec.pk_columns_list,
> '''],$1[''') || ''']))'
> , _activeRec.name_of_schema, _activeRec.main_table);
>
> execute _sqlStr using oldRec into _rec;
>
> My problem is oldRec is a type record, so the substitution performed by
> execute fails, because it can't recognize the field if the variable is
> record and not a specific composite record type.
Why not use a row type?:
https://www.postgresql.org/docs/current/plpgsql-declarations.html#PLPGSQL-DECLARATION-ROWTYPES
>
> I suppose this is a recurrent question, but I can't find a solution...
>
> --
> Domenico L.
--
Adrian Klaver
adrian.klaver@aklaver.com
Because the function is general and should do the same thing for many different table.
Unique constraint, each table must have a field with a specific type
Il mar 13 giu 2023, 01:31 Adrian Klaver <adrian.klaver@aklaver.com> ha scritto:
On 6/12/23 15:13, Lorusso Domenico wrote:
> Hello guys,
> I'm a problem with dynamic sql.
> I am trying to write a generic function that is able to read and update
> a table based on some data coming from e previous record.
> Here the example
> _sqlStr=format('select *
> from %1$s.%2$s
> where (' || array_to_string(_activeRec.pk_columns_list, ',') || ') in
> (select ' ||
> 'row($1[''' || array_to_string(_activeRec.pk_columns_list,
> '''],$1[''') || ''']))'
> , _activeRec.name_of_schema, _activeRec.main_table);
>
> execute _sqlStr using oldRec into _rec;
>
> My problem is oldRec is a type record, so the substitution performed by
> execute fails, because it can't recognize the field if the variable is
> record and not a specific composite record type.
Why not use a row type?:
https://www.postgresql.org/docs/current/plpgsql-declarations.html#PLPGSQL-DECLARATION-ROWTYPES
>
> I suppose this is a recurrent question, but I can't find a solution...
>
> --
> Domenico L.
--
Adrian Klaver
adrian.klaver@aklaver.com