PL/SQL 循环

文章分类:数据库

DECLARE
     x number;
     BEGIN
      x:=0;
      <<test_label>>
      x:=x+1;
      DBMS_OUTPUT.PUT_LINE('x='||x);
      IF x<5 THEN
      GOTO test_label;
      END IF;
     END;
     /

DECLARE 
     x number;
     BEGIN
      x:=0;
      <<test_label>>
      x:=x+1;
      DBMS_OUTPUT.PUT_LINE('x='||x);
      IF x<5 THEN
      GOTO test_label;
      END IF;
     END;
     /

 --循环

  --LOOP循环

DECLARE
 x number;
 BEGIN
  x:=0;
  LOOP
   x:=x+1;
   IF x > 10 THEN EXIT;
   END IF;
  END LOOP;
  DBMS_OUTPUT.PUT_LINE('x的值为：'||x);
 END;
 /

  DECLARE
   x number;
   BEGIN
    x:=0;
    LOOP
     x:=x+1;
     IF x > 10 THEN EXIT;
     END IF;
    END LOOP;
    DBMS_OUTPUT.PUT_LINE('x的值为：'||x);
   END;
   /

 
   另一种LOOP

DECLARE
 x number;
BEGIN
 x:=0;
 LOOP
  x:=x+1;
  EXIT WHEN x > 10 ;
 END LOOP;
 DBMS_OUTPUT.PUT_LINE('x的值为：'||x);
END;
/

   DECLARE
    x number;
   BEGIN
    x:=0;
    LOOP
     x:=x+1;
     EXIT WHEN x > 10 ;
    END LOOP;
    DBMS_OUTPUT.PUT_LINE('x的值为：'||x);
   END;
   /

    
   --WHILE循环
   

DECLARE
    x number;
    BEGIN
     x:=0;
     WHILE x<3
      LOOP
       x:=x+1;
      END LOOP;
     DBMS_OUTPUT.PUT_LINE('x的值为：'||x);
    END;
    /

DECLARE
    x number;
    BEGIN
     x:=0;
     WHILE x<3 
      LOOP
       x:=x+1;
      END LOOP;
     DBMS_OUTPUT.PUT_LINE('x的值为：'||x);
    END;
    /

     
    --FOR循环
   

DECLARE
    BEGIN
     FOR i IN REVERSE 1..10 LOOP
     --FOR i IN 1..10 LOOP
      DBMS_OUTPUT.PUT_LINE('i='||i);
     END LOOP;
    END;
    /

 DECLARE
     BEGIN
      FOR i IN REVERSE 1..10 LOOP
      --FOR i IN 1..10 LOOP
       DBMS_OUTPUT.PUT_LINE('i='||i);
      END LOOP;
     END;
     /

 

 

    --GOTO语句
   

DECLARE
 x number;
 BEGIN
  x:=0;
  <<test_label>>
  x:=x+1;
  DBMS_OUTPUT.PUT_LINE('x='||x);
  IF x<5 THEN
  GOTO test_label;
  END IF;
 END;
 /

    DECLARE 
     x number;
     BEGIN
      x:=0;
      <<test_label>>
      x:=x+1;
      DBMS_OUTPUT.PUT_LINE('x='||x);
      IF x<5 THEN
      GOTO test_label;
      END IF;
     END;
     /

					copy from : http://wyyl00.javaeye.com/blog/547441