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PLSQL跳出嵌套循环的小例子

2015-10-23 15:40 337 查看

转自：http://www.cnblogs.com/gaojian/archive/2012/11/13/2768455.html

DECLARE
v_cnt NUMBER:=0;
v_out_ext BOOLEAN:=FALSE;
v_in_ext  BOOLEAN:=FALSE;
BEGIN
<<Outer_loop>>
LOOP

EXIT WHEN v_cnt>20;

<<Inner_loop>>
LOOP
dbms_output.put_line(v_cnt);
v_cnt:=v_cnt+1;

IF v_cnt>5 THEN
v_in_ext:=TRUE;
END IF;

EXIT Outer_loop WHEN (v_in_ext = TRUE);
END LOOP;
dbms_output.put_line('++++++++++++++++++++');
END LOOP;
END;

运行结果：

anonymous block completed
0
1
2
3
4
5

如果改成跳出内部循环：

DECLARE
v_cnt NUMBER:=0;
v_out_ext BOOLEAN:=FALSE;
v_in_ext  BOOLEAN:=FALSE;
BEGIN
<<Outer_loop>>
LOOP

EXIT WHEN v_cnt>20;

<<Inner_loop>>
LOOP
dbms_output.put_line(v_cnt);
v_cnt:=v_cnt+1;

IF v_cnt>5 THEN
v_in_ext:=TRUE;
END IF;

EXIT Inner_loop WHEN (v_in_ext = TRUE);
END LOOP;
dbms_output.put_line('++++++++++++++++++++');
END LOOP;
END;

运行结果：

anonymous block completed
0
1
2
3
4
5
++++++++++++++++++++
6
++++++++++++++++++++
7
++++++++++++++++++++
8
++++++++++++++++++++
9
++++++++++++++++++++
10
++++++++++++++++++++
11
++++++++++++++++++++
12
++++++++++++++++++++
13
++++++++++++++++++++
14
++++++++++++++++++++
15
++++++++++++++++++++
16
++++++++++++++++++++
17
++++++++++++++++++++
18
++++++++++++++++++++
19
++++++++++++++++++++
20
++++++++++++++++++++

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