神谕。在两个过程中重用游标作为参数

Question

让我们创建两个测试程序:

CREATE OR REPLACE PROCEDURE Aaaa_Test1(
  pDog SYS_REFCURSOR
) IS
  TYPE tDogRec is record (objid varchar2(7), lim number, debt number);
  TYPE tDog IS TABLE OF tDogRec;
  vDog tDog;
BEGIN
  IF pDog%ISOPEN THEN
    FETCH pDog BULK COLLECT INTO vDog;

    IF vDog.count >= 1 THEN
      FOR i IN vDog.First..vDog.Last LOOP
        Dbms_Output.Put_Line('Aaaa_Test1 = '||vDog(i).Objid);
      END LOOP;
    END IF;

  END IF;
END; -- Aaaa_Test1 Procedure
/
CREATE OR REPLACE PROCEDURE Aaaa_Test2(
  pDog SYS_REFCURSOR
) IS
  TYPE tDogRec is record (objid varchar2(7), lim number, debt number);
  TYPE tDog IS TABLE OF tDogRec;
  vDog tDog;
BEGIN
  IF pDog%ISOPEN THEN
    FETCH pDog BULK COLLECT INTO vDog;

    IF vDog.count >= 1 THEN
      FOR i IN vDog.First..vDog.Last LOOP
        Dbms_Output.Put_Line('Aaaa_Test2 = '||vDog(i).Objid);
      END LOOP;
    END IF;

  END IF;
END; -- Aaaa_Test2 Procedure

然后让我们尝试打开游标并将其按顺序传递给这些过程:

DECLARE
  Vcdogcur SYS_REFCURSOR;    
BEGIN
  OPEN Vcdogcur FOR
    select '6518535' objid, 10000 lim,0 debt
      from dual
     union all
    select '6518536', 0,500
      from dual
     union all
    select '5656058', 0,899
      from dual
     union all
    select '2180965', 5000,0
      from dual
     union all
    select '2462902', 0,100
      from dual;

  Aaaa_Test1(Vcdogcur);
  Aaaa_Test2(Vcdogcur);
  CLOSE Vcdogcur;
END;

如您所见，我无法在第二个过程中使用已提取的游标，因为 ORACLE 游标是只进式和只读的。有什么方法可以帮助解决这个任务？

我不能简单地将这些程序合二为一。需要将它们的逻辑彼此分开。

Answer 1

您需要打开游标两次。使用字符串变量来保存查询将防止您编写查询两次。

DECLARE
      Vcdogcur SYS_REFCURSOR;    
      dyn_query varchar2(500);
BEGIN      
    dyn_query  := 'select ''6518535'' objid, 10000 lim,0 debt
      from dual
     union all
    select ''6518536'', 0,500
      from dual
     union all
    select ''5656058'', 0,899
      from dual
     union all
    select ''2180965'', 5000,0
      from dual
     union all
    select ''2462902'', 0,100
      from dual' ;


  open Vcdogcur for dyn_query ;
  Aaaa_Test1(Vcdogcur);
  CLOSE Vcdogcur;
  open Vcdogcur for dyn_query ;
  Aaaa_Test2(Vcdogcur);
  close Vcdogcur;
END;
/