mysql数据库如何循环语句

delimiter //                            #定义标识符为双斜杠

drop procedure if exists whileTest;          #如果存在whileTest存储过程则删除

create procedure whileTest()                 #创建无参存储过程,名称为whileTest

begin

    declare i int;                            #申明变量

    set i = 0;                               #变量赋值

    while i < 80 do                          #结束循环的条件: 当i大于80时跳出while循环

    insert into maomao(keyId) values (i);    #往maomao表添加数据

        set i = i + 1;                  #循环一次,i加一

    end while;                          #结束while循环

    select * from maomao;                 #查看maomao表数据

end

//                                      #结束定义语句

call whileTest();                            #调用存储过程

delimiter //                            #定义标识符为双斜杠

drop procedure if exists repeatTest;          #如果存在repeatTest存储过程则删除

create procedure repeatTest()                 #创建无参存储过程,名称为repeatTest

begin

    declare i int;                      #申明变量

    set i = 0;                          #变量赋值

    repeat

        insert into maomao values (i);    #往maomao表添加数据

        set i = i + 1;                  #循环一次,i加一

    until i > 80 end repeat;            #结束循环的条件: 当i大于80时跳出repeat循环

    select * from maomao;                 #查看maomao表数据

end

//                                      #结束定义语句

call repeatTest();                            #调用存储过程

delimiter //                            #定义标识符为双斜杠

drop procedure if exists loopTest;          #如果存在test存储过程则删除

create procedure loopTest()                 #创建无参存储过程,名称为loopTest

begin

    declare i int;                      #申明变量

    set i = 0;                          #变量赋值

    lp : loop                           #lp为循环体名,可随意 loop为关键字

        insert into maomao values (i);    #往test表添加数据

        set i = i + 1;                    #循环一次,i加一

        if i > 80 then                    #结束循环的条件: 当i大于80时跳出loop循环

            leave lp;

        end if;

    end loop;

    select * from maomao;                 #查看maomao表数据

end

//                                      #结束定义语句

call loopTest();