11gr2和12C上已經摒棄了wm_concat函數，當時我們很多程序員在程序中確使用了該函數，導致程序出現錯誤，為了減輕程序員修改程序的工作量，只有通過手工創建個wm_concat函數，來臨時解決該問題，但是注意，及時創建了該函數，在使用的過程中，也需要用to_char(wm_concat())方式，才能完全替代之前的應用。

一.解鎖wmsys用戶

alter user wmsys account unlock;

二.創建包、包體和函數

CREATE OR REPLACE TYPE WM_CONCAT_IMPL AS OBJECT

--?AUTHID?CURRENT_USER?AS?OBJECT

(

CURR_STR VARCHAR2(32767),

STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT WM_CONCAT_IMPL) RETURN NUMBER,

MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT WM_CONCAT_IMPL,

P1 IN VARCHAR2) RETURN NUMBER,

MEMBER FUNCTION ODCIAGGREGATETERMINATE(SELF IN WM_CONCAT_IMPL,

RETURNVALUE OUT VARCHAR2,

FLAGS IN NUMBER)

RETURN NUMBER,

MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF IN OUT WM_CONCAT_IMPL,

SCTX2 IN WM_CONCAT_IMPL) RETURN NUMBER

);

/

上邊不知道反證我們自己用的是下邊那個:

CREATE OR REPLACE TYPE WMSYS.WM_CONCAT_IMPL AS OBJECT

-- AUTHID CURRENT_USER AS OBJECT

(

CURR_STR VARCHAR2(32767),

STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT WM_CONCAT_IMPL) RETURN NUMBER,

MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT WM_CONCAT_IMPL,

P1 IN VARCHAR2) RETURN NUMBER,

MEMBER FUNCTION ODCIAGGREGATETERMINATE(SELF IN WM_CONCAT_IMPL,

RETURNVALUE OUT VARCHAR2,

FLAGS IN NUMBER)

RETURN NUMBER,

MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF IN OUT WM_CONCAT_IMPL,

SCTX2 IN WM_CONCAT_IMPL) RETURN NUMBER

)

--定義類型body:

CREATE OR REPLACE TYPE BODY WM_CONCAT_IMPL

IS

STATIC FUNCTION ODCIAGGREGATEINITIALIZE(SCTX IN OUT WM_CONCAT_IMPL)

RETURN NUMBER

IS

BEGIN

SCTX := WM_CONCAT_IMPL(NULL) ;

RETURN ODCICONST.SUCCESS;

END;

MEMBER FUNCTION ODCIAGGREGATEITERATE(SELF IN OUT WM_CONCAT_IMPL,

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 WM_CONCAT_IMPL,

RETURNVALUE OUT VARCHAR2,

FLAGS IN NUMBER)

RETURN NUMBER

IS

BEGIN

RETURNVALUE := CURR_STR ;

RETURN ODCICONST.SUCCESS;

END;

MEMBER FUNCTION ODCIAGGREGATEMERGE(SELF IN OUT WM_CONCAT_IMPL,

SCTX2 IN WM_CONCAT_IMPL)

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;

/

--自定義行變列函數:

CREATE OR REPLACE FUNCTION wm_concat(P1 VARCHAR2)

RETURN VARCHAR2 AGGREGATE USING WM_CONCAT_IMPL ;

/

三.創建同義詞并授權

create public synonym WM_CONCAT_IMPL for wmsys.WM_CONCAT_IMPL

/

create public synonym wm_concat for wmsys.wm_concat

/

grant execute on WM_CONCAT_IMPL to public

/

grant execute on wm_concat to public

/

總結

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