mysql 存儲過程創建一年表

drop PROCEDURE  if EXISTS  create_table; 
delimiter // 
create procedure create_table() 
begin
    declare date_end date;
    declare date_tmp date;
    declare str_sql varchar(4000);
    declare sql_tmp varchar(4000);
    declare tbl_nm varchar(50);
    declare month_day char(4);
    
    set @date_end=date_format(date_add(now(), INTERVAL 1 year),    '%Y%m%d');
    set @date_tmp=date_format(date_add(now(), INTERVAL 0 day),    '%Y%m%d');
    set @str_sql="
      (
          `name` char(20) DEFAULT NULL,
          `age` int(11) DEFAULT NULL,
          `tel` char(11) NOT NULL,
          PRIMARY KEY (`tel`)
       ) ENGINE=InnoDB DEFAULT CHARSET=latin1;";

    repeat
        set @month_day=substr(@date_tmp, 5, 8);
        set @tbl_nm=concat('tbl_student_', @month_day);
        set @sql_tmp=concat('create table ', @tbl_nm, @str_sql);
        -- select @sql_tmp;
        prepare sql_tmp from @sql_tmp;
        
        execute sql_tmp;
        
        set @date_tmp=date_format(date_add(@date_tmp, INTERVAL 1 day),    '%Y%m%d');
    until @date_tmp=@date_end
    end repeat;
end;
//
delimiter ;

call create_table();

drop PROCEDURE  if EXISTS  create_table; 
delimiter // 
create procedure create_table() 
begin
    declare date_end date;
    declare date_tmp date;
    declare sql_tmp varchar(4000);
    declare tbl_nm varchar(50);
    declare month_day char(4);
    
    set @date_end=date_format(date_add(now(), INTERVAL 1 year),    '%Y%m%d');
    set @date_tmp=date_format(date_add(now(), INTERVAL 0 day),    '%Y%m%d');
    repeat
        set @month_day=substr(@date_tmp, 5, 8);
        select @month_day;
        set @tbl_nm=concat('tbl_student_', @month_day);
        set @sql_tmp=concat('drop table if EXISTS ', @tbl_nm);
        
        prepare sql_tmp from @sql_tmp;
        
        execute sql_tmp;
        
        set @date_tmp=date_format(date_add(@date_tmp, INTERVAL 1 day),    '%Y%m%d');
    until @date_tmp=@date_end
    end repeat;
end;
//
delimiter ;

call create_table();