6、不生成 version 字段

class UserSystemInfo {

    int id //主键标识
    String newsContent  //消息内容
    String typeId //类型ID
    int status //状态
    LoginInfo loginInfo //用户登录信息外键

    static constraints = {
    }

    static mapping = {
        version false //不生成列version
        //id sqlType:'varchar(20)',generator:'assigned'

    }

}