WHERE CURRENT OF

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