新闻评论实体类及评论表操作类

/*
 *  作者：张良伟
 *  创建时间：2013-12-10 10:00

 *  类说明：新闻评论实体类
 */
namespace Model
{
    /// <summary>
    /// 新闻评论实体类
    /// </summary>
    public class Comment
    {
        private string id;
        /// <summary>
        /// 主键，自增
        /// </summary>
        public string Id
        {
            get { return id; }
            set { id = value; }
        }

        private string content;
        /// <summary>
        /// 评论内容
        /// </summary>
        public string Content
        {
            get { return content; }
            set { content = value; }
        }

        private string userIp;
        /// <summary>
        /// 评论人IP
        /// </summary>
        public string UserIp
        {
            get { return userIp; }
            set { userIp = value; }
        }

        private string createTime;
        /// <summary>
        /// 评论发表时间
        /// </summary>
        public string CreateTime
        {
            get { return createTime; }
            set { createTime = value; }
        }

        private string newsId;
        /// <summary>
        /// 所属新闻ID
        /// </summary>
        public string NewsId
        {
            get { return newsId; }
            set { newsId = value; }
        }

        public Comment()
        { }

        public Comment(string content, string userIp, string newsId)
        {
            this.content = content;
            this.userIp = userIp;
            this.newsId = newsId;
        }
    }
}

/*
 * 创建人：张良伟
 * 创建时间：2013-12-10 10:00

* 说明：评论表操作类
 * 版权所有：张良伟&www.tg029.com(众志网)
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using Model;

namespace DAL
{
    public class CommentDAO
    {
        private SQLHelper sqlhelper;
        public CommentDAO()
        {
            sqlhelper = new SQLHelper();
        }

        /// <summary>
        ///  根据新闻ID取出该新闻的所有评论
        /// </summary>
        /// <param name="newsId">新闻ID</param>
        /// <returns></returns>
        public DataTable SelectByNewsId(string newsId)
        {
            DataTable dt = new DataTable();
            string sql = "select * from comment where newsId=@newsId order by createTime desc";
            SqlParameter[] paras = new SqlParameter[] {
            new SqlParameter("@newsId", newsId)
           };
            dt = sqlhelper.ExecuteQuery(sql, paras, CommandType.Text);
            return dt;
        }

        /// <summary>
        ///  添加评论
        /// </summary>
        /// <param name="c">评论实体类</param>
        /// <returns></returns>
        public bool Insert(Comment c)
        {
            bool flag = false;
            string sql = "insert into comment([content],userIp, newsId) values(@content,@userIp,@newsId)";
            SqlParameter[] paras = new SqlParameter[] {
            new SqlParameter("@content", c.Content),
            new SqlParameter("@userIp", c.UserIp),
            new SqlParameter("@newsId", c.NewsId)
           };
            int res = sqlhelper.ExecuteNonQuery(sql, paras, CommandType.Text);
            if (res > 0)
            {
                flag = true;
            }
            return flag;
        }

        /// <summary>
        ///  删除评论
        /// </summary>
        /// <param name="id">评论ID</param>
        /// <returns></returns>
        public bool Delete(string id)
        {
            bool flag = false;
            string sql = "delete comment where id=@id";
            SqlParameter[] paras = new SqlParameter[] {
            new SqlParameter("@id",id)
           };
            int res = sqlhelper.ExecuteNonQuery(sql, paras, CommandType.Text);
            if (res > 0)
            {
                flag = true;
            }
            return flag;
        }
    }
}