oracle中，行转列函数wm_concat()结果有长度限制，重写该函数解决

--Type
CREATE OR REPLACE TYPE yxwsp.zh_concat_im   AS OBJECT
(
  CURR_STR clob,
  STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT zh_concat_im)
    RETURN NUMBER,
  MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT zh_concat_im,
                                       P1   IN VARCHAR2) RETURN NUMBER,
  MEMBER FUNCTION ODCIAGGREGATETERMINATE(SELF        IN zh_concat_im,
                                         RETURNVALUE OUT clob,
                                         FLAGS       IN NUMBER)
    RETURN NUMBER,
  MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF  IN OUT zh_concat_im,
                                     SCTX2 IN zh_concat_im) RETURN NUMBER
);

--TYPE BODY
CREATE OR REPLACE TYPE BODY  yxwsp.zh_concat_im IS
  STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT zh_concat_im)
    RETURN NUMBER IS
  BEGIN
    SCTX := zh_concat_im(NULL);
    RETURN ODCICONST.SUCCESS;
  END;
  MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT zh_concat_im,
                                       P1   IN VARCHAR2) RETURN NUMBER IS
  BEGIN
    IF (CURR_STR IS NOT NULL) THEN
      CURR_STR := CURR_STR || ',' || P1;
    ELSE
      CURR_STR := P1;
    END IF;
    RETURN ODCICONST.SUCCESS;
  END;
  MEMBER FUNCTION ODCIAGGREGATETERMINATE(SELF        IN zh_concat_im,
                                         RETURNVALUE OUT clob,
                                         FLAGS       IN NUMBER) RETURN NUMBER IS
  BEGIN
    RETURNVALUE := CURR_STR;
    RETURN ODCICONST.SUCCESS;
  END;
  MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF  IN OUT zh_concat_im,
                                     SCTX2 IN zh_concat_im) RETURN NUMBER IS
  BEGIN
    IF (SCTX2.CURR_STR IS NOT NULL) THEN
      SELF.CURR_STR := SELF.CURR_STR || ',' || SCTX2.CURR_STR;
    END IF;
    RETURN ODCICONST.SUCCESS;
  END;
END; 
/
--FUNCTION 
create or replace FUNCTION  yxwsp.zh_concat(P1 VARCHAR2) RETURN clob AGGREGATE USING zh_concat_im;