标签：style class blog c code java
果你想删除或者更新被Select For Update引用的记录，你可以使用Where Current Of语句。
UPDATE table_name SET set_clause WHERE CURRENT OF cursor_name; OR DELETE FROM table_name WHERE CURRENT OF cursor_name;
Where Current Of语句允许你更新或者是删除最后由cursor取的记录。
下面一个使用Where Current
Of更新记录的例子：
CREATE OR REPLACE Function FindCourse ( name_in IN varchar2 ) RETURN number IS cnumber number; CURSOR c1 IS SELECT course_number, instructor from courses_tbl where course_name = name_in FOR UPDATE of instructor; BEGIN open c1; fetch c1 into cnumber; if c1%notfound then cnumber := 9999; else UPDATE courses_tbl SET instructor = ‘SMITH‘ WHERE CURRENT OF c1; COMMIT; end if; close c1; RETURN cnumber; END;
Deleting using the WHERE CURRENT OF Statement
Here is an example where we
are
deleting records using the Where Current Of Statement:
译：下面一个使用Where
Current Of删除记录的例子：
CREATE OR REPLACE Function FindCourse ( name_in IN varchar2 ) RETURN number IS cnumber number; CURSOR c1 IS SELECT course_number, instructor from courses_tbl where course_name = name_in FOR UPDATE of instructor; BEGIN open c1; fetch c1 into cnumber; if c1%notfound then cnumber := 9999; else DELETE FROM courses_tbl WHERE CURRENT OF c1; COMMIT; end if; close c1; RETURN cnumber; END;
WHERE CURRENT OF,布布扣,bubuko.com
标签：style class blog c code java
原文地址：http://www.cnblogs.com/nuaa/p/3749861.html
