MySQL的存储过程——流程控制-case

-- 语法一（类比java的switch）：
case case_value
    when when_value then statement_list
    [when when_value then statement_list] ...
    [else statement_list]
end case
-- 语法二：
case
    when search_condition then statement_list
    [when search_condition then statement_list] ...
    [else statement_list]
end case
-- 语法一
delimiter $$
create procedure proc14_case(in pay_type int)
begin
  case pay_type
        when  1 
          then 
              select '微信支付' ;
        when  2 then select '支付宝支付' ;
        when  3 then select '银行卡支付';
      else select '其他方式支付';
    end case ;
end $$
delimiter ;
call proc14_case(2);
call proc14_case(4);
-- 语法二
delimiter  $$
create procedure proc_15_case(in score int)
begin
  case
  when score < 60 
      then
          select '不及格';
    when  score < 80
      then
          select '及格' ;
    when score >= 80 and score < 90
       then 
           select '良好';
  when score >= 90 and score <= 100
       then 
           select '优秀';
     else
       select '成绩错误';
  end case;
end $$
delimiter  ;
call proc_15_case(88);