PLSQL流程控制

PLSQL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exit是退出循环，而不是退出整个代码块
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;