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。
一.解锁wmsys用户
alter user wmsys account unlock;
二.创建包、包体和函数
以wmsys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 ;
- /