在存储过程中使用循环（loop）
---下面是真实环境下loop运用的实例
CREATE OR REPLACE FUNCTION USF_GET_CS_FAC_PUR_MULTI_DSCP
/*
      Copyright(c) 2007 XXX
*/
(
  fac_id_in        IN TBL_FAC_PUR.FAC_ID%TYPE
)
RETURN VARCHAR2
AS
    RETURN_FAC_DSCP NVARCHAR2(2000);
    v_record     NVARCHAR2(2000);
    V_MT_FAC_DSCP_CUR TYPES.cursor_type;
BEGIN
  BEGIN
    RETURN_FAC_DSCP := ' ';
    -- 1. select records into cursor
    OPEN V_MT_FAC_DSCP_CUR FOR
SELECT TBL_MT_FAC_PUR.DSCP
           FROM TBL_MT_FAC_PUR
           INNER JOIN TBL_FAC_PUR ON TBL_FAC_PUR.MT_FAC_PUR_CD = TBL_MT_FAC_PUR.CD
           WHERE TBL_FAC_PUR.FAC_ID = fac_id_in;
      -- 2. loop the cursor
         LOOP
          FETCH V_MT_FAC_DSCP_CUR INTO v_record;
            EXIT WHEN V_MT_FAC_DSCP_CUR%NOTFOUND;

          IF RETURN_FAC_DSCP = ' ' THEN

            RETURN_FAC_DSCP := v_record;

          ELSE
          RETURN_FAC_DSCP := RETURN_FAC_DSCP || ', ' || v_record;
        END IF;
      END LOOP;
   END;
  RETURN RETURN_FAC_DSCP;
END;


=====实例2==============

CREATE OR REPLACE FUNCTION USF_GET_CS_COND_CDI_MULTI_DSCP
/*
      Copyright(c) 2007 XXX
      20080314 : Initial Creation by XXX
*/
(
              fac_id_in        IN TBL_FAC_COND.FAC_ID%TYPE
)
RETURN VARCHAR2
AS

    RETURN_COND_DSCP NVARCHAR2(2000);
    v_record     NVARCHAR2(2000);
    V_COND_DSCP_CUR TYPES.cursor_type;

  BEGIN
    BEGIN
      RETURN_COND_DSCP := ' ';
      -- 1. select records into cursor    
      OPEN V_COND_DSCP_CUR FOR
SELECT TBL_FAC_COND.CONDITION
       FROM TBL_FAC_COND
      WHERE TBL_FAC_COND.FAC_ID = fac_id_in;
      -- 2. loop the cursor
      LOOP
        FETCH V_COND_DSCP_CUR INTO v_record;
        EXIT WHEN V_COND_DSCP_CUR%NOTFOUND;

        IF RETURN_COND_DSCP = ' ' THEN

          RETURN_COND_DSCP := v_record;

        ELSE

          RETURN_COND_DSCP := RETURN_COND_DSCP || ', ' || v_record;

        END IF;
      END LOOP;
    END;
    RETURN RETURN_COND_DSCP;
  END;