Mysql5.7下的三种循环

方法一：while .....do.....end while

create procedure pwhile()

begin

declare i int;

set i = 0;

while i <10 do

insert into table_name values (i);

set i = i+1;

end while;

end;

call pwhile();

方法二：repeat ....until... end repeat

create procedure prepeat()

begin

declare i int ;

set i =0;

repeat

insert into table_name values(i);

set i +=1;

until i <20;

end repeat;

end;

call prepeat();

方法三：loop ....end loop

create procedure ploop()

begin

declare i int;

set i = 0;

loop_lable:loop

insert into table_name values (i);

set i = i+1;

if i >=20 then

leave loop_table;

end if ;

end loop;

end;

call ploop();

利用iterate 迭代循环，当然，iterate既可用于loop循环，也可用于while,repeate 这几种循环中，下面，以将iterate 用于loop循环为例：

create procedure piter()

begin

declare i int;

set i = 35;

loop_label:loop

if i = 43 then

set i = i+1;

iterate loop_label;

end if;

insert into t4 values(i);

set i = i+1;

if i>50 then

leave loop_label

end if;

end loop;

end;

call piter();