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oracle ±Ê¼Ç VI Ö®Óαê (CURSOR)

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Óαê:ÓÃÓÚ´¦Àí¶àÐмǼµÄÊÂÎñ
ÓαêÊÇÒ»¸öÖ¸ÏòÉÏÏÂÎĵľä±ú(handle)»òÖ¸Õë,¼òµ¥Ëµ£¬Óαê¾ÍÊÇÒ»¸öÖ¸Õë
1 ´¦ÀíÏÔʽÓαê
  ÏÔʽÓα괦ÀíÐè 4¸ö PL/SQL ²½Öè,ÏÔʾÓαêÖ÷ÒªÓÃÓÚ´¦Àí²éѯÓï¾ä
  (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 Óï¾äÖظ´´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;
----------------------------------
 Á·Ï°: ÊäÈ벿ÃźŠdep_id,²éѯ¸Ã²¿ÃŵÄƽ¾ù¹¤×Ê : avg_sal,Ô±¹¤¹¤×ÊΪ salary
       Èô salary < avg_sal - 500 ¹¤×ÊÕÇ 500
       Èô avg_sal - 500 <= salary < avg_sal + 500 ¹¤×ÊÕÇ 300
       Èô


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CREATE OR REPLACE VIEW SM_V_UNIT_AUTH AS
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