mysql -- 逻辑语句

1.if语句

delimiter \\
create procedure p1()
begin
    declare i int default ;
    if i =  then
        select ;
    elseif i =  then
        select ;
    else
        select ;
    end if;
end \\
delimiter ;

2.循环

delimiter \\
create procedure p1_while()
begin
 declare num int;
 set num =;
 while num <  do
     select num;
     set num = num +;
 end while;
end \\
delimiter ;

delimiter \\
create procedure p1_repeat()
begin
    declare i int;
    set i = ;
    repeat
        select i;
        set i =i +;
    until i> end repeat;
end \\
delimiter ;

delimiter //
    declare i int default ;
    loop_label: loop
           set i=i+;
           if i< then
              iterate loop_label;
           end if;
           if i >= then
              leave loop_label;
           end if;
           select i;
   end loop loop_label;
delimiter ;