破解Oracle函数"wmsys.wm_concat()"

       自定义此函数是由于“wmsys.wm_concat”在10G中不稳定。现已写成自己定义的函数，功能与用法和“wmsys.wm_concat”函数一样。赶紧贴出了给大伙看看。

备注： 这是从开源网转载而来的源码，经过本人的多次验证和实际运用此函数可行。

 

 

create or replace TYPE zh_concat_im AUTHID CURRENT_USER AS OBJECT(  CURR_STR VARCHAR2(32767),  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 VARCHAR2,                                 FLAGS IN NUMBER)                     RETURN NUMBER,  MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF IN OUT zh_concat_im,                     SCTX2 IN  zh_concat_im) RETURN NUMBER);/create or replace TYPE BODY zh_concat_imIS  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 VARCHAR2,                                 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;/

 

---函数create or replace FUNCTION zh_concat(P1 VARCHAR2) RETURN VARCHAR2 AGGREGATE USING zh_concat_im ;

 

用法：

   SELECT  zh_concat(str) from dual;  ---调用函数

 

备注：以上红色字体可以自定义合并的区分符号。