重构wm_concat,采用clob做为存储容器

--Type
CREATE OR REPLACE TYPE zh_concat_im AUTHID CURRENT_USER 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 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 zh_concat(P1 VARCHAR2) RETURN clob AGGREGATE USING zh_concat_im;