/// <summary>
        /// 增加一条数据
        /// </summary>
        public bool Add(questionModel model)
        {
            StringBuilder strSql=new StringBuilder();
            strSql.Append("insert into question(");
            strSql.Append("nc_qid,nvc_qcontent,int_qtype,nvc_source)");
            strSql.Append(" values (");
            strSql.Append("@nc_qid,@nvc_qcontent,@int_qtype,@nvc_source)");
            SqlParameter[] parameters = {
                    new SqlParameter("@nc_qid", SqlDbType.NChar,10),
                    new SqlParameter("@nvc_qcontent", SqlDbType.NVarChar,2000),
                    new SqlParameter("@int_qtype", SqlDbType.Int,4),
                    new SqlParameter("@nvc_source", SqlDbType.NVarChar,500)};
            parameters[0].Value = model.nc_qid;
            parameters[1].Value = model.nvc_qcontent;
            parameters[2].Value = model.int_qtype;
            parameters[3].Value = model.nvc_source;

            int rows=DbHelperSQL.ExecuteSql(strSql.ToString(),parameters);
            if (rows > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
 /// <summary>
 /// 得到一个对象实体
 /// </summary>
 public questionModel DataRowToModel(DataRow row)
 {
     questionModel model=new questionModel();
     if (row != null)
     {
         if(row["nc_qid"]!=null)
         {
             model.nc_qid=row["nc_qid"].ToString();
         }
         if(row["nvc_qcontent"]!=null)
         {
             model.nvc_qcontent=row["nvc_qcontent"].ToString();
         }
         if(row["int_qtype"]!=null && row["int_qtype"].ToString()!="")
         {
             model.int_qtype=int.Parse(row["int_qtype"].ToString());
         }
         if(row["nvc_source"]!=null)
         {
             model.nvc_source=row["nvc_source"].ToString();
         }
     }
     return model;
 }
        /// <summary>
        /// 更新一条数据
        /// </summary>
        public bool Update(questionModel model)
        {
            StringBuilder strSql=new StringBuilder();
            strSql.Append("update question set ");
            strSql.Append("nvc_qcontent=@nvc_qcontent,");
            strSql.Append("int_qtype=@int_qtype,");
            strSql.Append("nvc_source=@nvc_source");
            strSql.Append(" where nc_qid=@nc_qid ");
            SqlParameter[] parameters = {
                    new SqlParameter("@nvc_qcontent", SqlDbType.NVarChar,2000),
                    new SqlParameter("@int_qtype", SqlDbType.Int,4),
                    new SqlParameter("@nvc_source", SqlDbType.NVarChar,500),
                    new SqlParameter("@nc_qid", SqlDbType.NChar,10)};
            parameters[0].Value = model.nvc_qcontent;
            parameters[1].Value = model.int_qtype;
            parameters[2].Value = model.nvc_source;
            parameters[3].Value = model.nc_qid;

            int rows=DbHelperSQL.ExecuteSql(strSql.ToString(),parameters);
            if (rows > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        /// <summary>
        /// 得到一个对象实体
        /// </summary>
        public questionModel GetModel(string nc_qid)
        {
            StringBuilder strSql=new StringBuilder();
            strSql.Append("select  top 1 nc_qid,nvc_qcontent,int_qtype,nvc_source from question ");
            strSql.Append(" where nc_qid=@nc_qid ");
            SqlParameter[] parameters = {
                    new SqlParameter("@nc_qid", SqlDbType.NChar,10)			};
            parameters[0].Value = nc_qid;

            questionModel model=new questionModel();
            DataSet ds=DbHelperSQL.Query(strSql.ToString(),parameters);
            if(ds.Tables[0].Rows.Count>0)
            {
                return DataRowToModel(ds.Tables[0].Rows[0]);
            }
            else
            {
                return null;
            }
        }