oracle ±Ê¼Ç VI Ö®Óαê (CURSOR)
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(1) ¶¨ÒåÓαê
¸ñʽ: CURSOR cursor_name [(partment[,parameter]...)] IS select_statement;
¶¨ÒåµÄÓα겻ÄÜÓÐ INTO ×Ó¾ä
(2) ´ò¿ªÓαê
OPEN cursor_name[...];
PL/SQL ³ÌÐò²»ÄÜÓà OPEN Óï¾äÖØ¸´´ò¿ªÒ»¸öÓαê
(3)ÌáÈ¡ÓαêÊý¾Ý
FETCH cursor_name INTO {variable_list | record_variable};
(4) ¹Ø±ÕÓαê
CLOSE cursor_name;
Àý 1 ²éѯǰ 10 ÃûÔ±¹¤µÄÐÅÏ¢
declare
--¶¨ÒåÓαê
cursor c_cursor is select last_name,salary from employees where rownum < 11 order by salary;
v_name employees.last_name%type;
V_sal employees.salary%type;
begin
--´ò¿ªÓαê
open c_cursor;
-- ÌáÈ¡ÓαêÊý¾Ý
fetch c_cursor into v_name,v_sal;
while c_cursor %found loop
dbms_output.put_line(v_name || ':' || v_sal);
fetch c_cursor into v_name,v_sal;
end loop;
--¹Ø±ÕÓαê
close c_cursor;
end;
----------------------------------
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Èô salary < avg_sal - 500 ¹¤×ÊÕÇ 500
Èô avg_sal - 500 <= salary < avg_sal + 500 ¹¤×ÊÕÇ 300
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