PL/SQL流程控制

if判断

declare


v_b boolean:=true;

begin if v_b then


dbms_output.put_line('ok');


end if;

end;

if else判断

declare


v_b boolean:=true;

begin


if v_b then


dbms_output.put_line('ok');


else


dbms_output.put_line('false');


end if;

end;

if elsif else判断

declare


v_name varchar2(20):='cheng';

begin


if v_name='0701' then


dbms_output.put_line('0701');


elsif v_name='cheng' then


dbms_output.put_line('cheng');


else


dbms_output.put_line('false');


end if;

end;

loop循环，注意推出exit是推出循环，而不是推出整个代码块

declare


v_i binary_integer:=0;

begin


loop


if v_i>10 then


exit;


end if;


v_i:=v_i+1;


dbms_output.put_line('hehe');


end loop;


dbms_output.put_line('over');

end;


loop简化写法

declare


v_i
binary_integer :=0;


begin


loop


exit when v_i>10;


v_i :=v_i+1;


dbms_output.put_line('hehe');


end loop;


dbms_output.put_line('over');


end;

while循环
declare


v_i binary_integer:=0;

begin


while v_i<10 loop


dbms_output.put_line('hello'||v_i );


v_i:=v_i+1;


end loop;


dbms_output.put_line('over');

end;

for循环，注意不需要声明变量
begin


for v_i in 0..10 loop


dbms_output.put_line('hello'||v_i);


end loop;


dbms_output.put_line('over');

end;