[Oracle] 循环的几种方式

-- goto
declare
x number;
begin
x:=9;
<<repeat_loop>>
x:=x-1;
dbms_output.put_line('x: '||x);
if x>0 then
goto repeat_loop;
end if;
end;

-- for
declare
x number;
begin
x:=1;
for x in reverse 1..10 loop
dbms_output.put_line('x: '||x);
end loop;
dbms_output.put_line('end loop x: '||x);
end;

-- while
declare
x number;
begin
x:=0;
while x < 10 loop
dbms_output.put_line('x: '||x);
x:=x+1;
end loop;
dbms_output.put_line('end while:x '||x);
end;

-- loop
declare
x number;
begin
x:=0;
loop
x:=x+1;
exit when x>9;
dbms_output.put_line('x: '||x);
end loop;
dbms_output.put_line('end loop x: '||x);
end;