mysql按月自动建库并添加权限

开发有个按月自动建库并添加权限的需求。

CREATE  PROCEDURE `create_database`()
BEGIN
  declare cur_date,las_date BIGINT; 
  declare createdb,grantdb varchar(4000);
     select date_format(now(),'%Y%m%d')+20 into cur_date;
     select date_format(last_day(curdate()),'%Y%m%d') into las_date;
    
    
  if cur_date=las_date then
    set @insql2=concat('grant all privileges on ','icosthisbak',date_format(now(),'%Y%m')+1,'.* TO `test`@`%`' ); 
    set @insql= concat('create database ','icosthisbak',date_format(now(),'%Y%m')+1,';' );
      select @insql,@insql2;
      PREPARE insert_online FROM @insql;
      PREPARE insert_online2 FROM @insql2;
      EXECUTE insert_online;
      EXECUTE insert_online2;
    select createdb;
  else  
      select '不需要创建!';  
  end if ;
end