LR连接oracle时报未在本地计算机上注册“OraOLEDB.Oracle.1的问题

--取两个日期间的工作天数 SELECT COUNT(*) INTO vn FROM (SELECT vod + ROWNUM - 1 RN FROM DUAL CONNECT BY ROWNUM <= vnd - vod) WHERE TO_CHAR(RN, 'D') BETWEEN 2 AND 6; --返回数字 R