oracle中wm_concat

oracle中wm_concat标识符无效原因：
11gr2和12C上已经摒弃了wm_concat函数，当时我们很多程序员在程序中确使用了该函数，导致程序出现错误，为了减轻程序员修改程序的工作量，只有通过手工创建个wm_concat函数，来临时解决该问题，但是注意，及时创建了该函数，在使用的过程中，也需要用to_char(wm_concat())方式，才能完全替代之前的应用。

解决方案

1. 创建包、包体和函数

以sys用户登录数据库，执行下面的命令

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
);

定义类型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;

自定义行变列函数:

CREATE OR REPLACE FUNCTION wm_concat(P1 VARCHAR2)
RETURN VARCHAR2 AGGREGATE USING WM_CONCAT_IMPL ;

2. 创建同义词并授权

create public synonym WM_CONCAT_IMPL for sys.WM_CONCAT_IMPL;
create public synonym wm_concat for sys.wm_concat;
grant execute on WM_CONCAT_IMPL to public;
grant execute on wm_concat to public;

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