/// <summary>
        /// 增加一条数据
        /// </summary>
        public bool Add(RolesME model)
        {
            StringBuilder strSql=new StringBuilder();
            strSql.Append("insert into Roles(");
            strSql.Append("roleid,rolename,rolevalue)");
            strSql.Append(" values (");
            strSql.Append("@roleid,@rolename,@rolevalue)");
            SqlParameter[] parameters = {
                    new SqlParameter("@roleid", SqlDbType.Int,4),
                    new SqlParameter("@rolename", SqlDbType.NVarChar,50),
                    new SqlParameter("@rolevalue", SqlDbType.VarChar)};
            parameters[0].Value = model.roleid;
            parameters[1].Value = model.rolename;
            parameters[2].Value = model.rolevalue;

            int rows = DbHelperSQL.ExecuteSql(PubConstant.ConnectionStringAccountDB,strSql.ToString(), parameters);
            if (rows > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        /// <summary>
        /// 更新一条数据
        /// </summary>
        public bool Update(RolesME model)
        {
            StringBuilder strSql=new StringBuilder();
            strSql.Append("update Roles set ");
            strSql.Append("roleid=@roleid,");
            strSql.Append("rolevalue=@rolevalue");
            strSql.Append(" where rolename=@rolename ");
            SqlParameter[] parameters = {
                    new SqlParameter("@roleid", SqlDbType.Int,4),
                    new SqlParameter("@rolevalue", SqlDbType.VarChar),
                    new SqlParameter("@rolename", SqlDbType.NVarChar,50)};
            parameters[0].Value = model.roleid;
            parameters[1].Value = model.rolevalue;
            parameters[2].Value = model.rolename;

            int rows = DbHelperSQL.ExecuteSql(PubConstant.ConnectionStringAccountDB,strSql.ToString(), parameters);
            if (rows > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        /// <summary>
        /// 得到一个对象实体
        /// </summary>
        public RolesME GetModel(string rolename)
        {
            StringBuilder strSql=new StringBuilder();
            strSql.Append("select  top 1 roleid,rolename,rolevalue from Roles ");
            strSql.Append(" where rolename=@rolename ");
            SqlParameter[] parameters = {
                    new SqlParameter("@rolename", SqlDbType.NVarChar,50)			};
            parameters[0].Value = rolename;

            RolesME model=new RolesME();
            DataSet ds = DbHelperSQL.Query(PubConstant.ConnectionStringAccountDB,strSql.ToString(), parameters);
            if(ds.Tables[0].Rows.Count>0)
            {
                if(ds.Tables[0].Rows[0]["roleid"]!=null && ds.Tables[0].Rows[0]["roleid"].ToString()!="")
                {
                    model.roleid=int.Parse(ds.Tables[0].Rows[0]["roleid"].ToString());
                }
                if(ds.Tables[0].Rows[0]["rolename"]!=null && ds.Tables[0].Rows[0]["rolename"].ToString()!="")
                {
                    model.rolename=ds.Tables[0].Rows[0]["rolename"].ToString();
                }
                if(ds.Tables[0].Rows[0]["rolevalue"]!=null && ds.Tables[0].Rows[0]["rolevalue"].ToString()!="")
                {
                    model.rolevalue=ds.Tables[0].Rows[0]["rolevalue"].ToString();
                }
                return model;
            }
            else
            {
                return null;
            }
        }