如何用 refcursor 返回結果集
阿新 • • 發佈:2021-07-28
可以通過返回 Refcursor 型別的函式,或者out 型別的函式或 procedure 返回結果集。
一、返回refcursor 型別的函式
create or replace function f_get_set(refcursor,refcursor) returns setof refcursor as $$ begin open $1 for select * from t1; return next $1; open $2 for select * from t1; return next $2; end; $$ language plsql; begin;select * from get_set('a'::refcursor,'b'::refcursor); fetch all from a; end
二、通過OUT型別的函式引數
create or replace function func_get_set_out(out cur_a refcursor,out cur_b refcursor) as $$ begin open cur_a for select * from t1; open cur_b for select * from t1; end; $$ language plpgsql; declare v_ref_cur1 refcursor; v_ref_cur2 refcursor; v_t1 t1%rowtype; begin select * from get_set_out() into v_ref_cur1,v_ref_cur2; loop fetch v_ref_cur1 into v_t1; exit when v_ref_cur1%NOTFOUND; raise notice '%',v_t1.oid; end loop; loop fetch v_ref_cur2 into v_t1; exit when v_ref_cur2%NOTFOUND; raise notice '%',v_t1.oid; endloop; end;
三、通過OUT型別的過程引數
create or replace procedure proc_get_set_out(inout cur_a refcursor,inout cur_b refcursor) as $$ begin open cur_a for select * from t1; open cur_b for select * from t1; end; $$ language plpgsql; declare v_ref_cur1 refcursor; v_ref_cur2 refcursor; v_t1 t1%rowtype; begin call proc_get_set_out(v_ref_cur1,v_ref_cur2); loop fetch v_ref_cur1 into v_t1; exit when v_ref_cur1%NOTFOUND; raise notice '%',v_t1.oid; end loop; loop fetch v_ref_cur2 into v_t1; exit when v_ref_cur2%NOTFOUND; raise notice '%',v_t1.oid; end loop; end;KINGBASE研究院