DAL/FriendsInfoService.cs

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using System;
using System.Data;
using System.Text;
using System.Data.SqlClient;

namespace DAL
{
	/// <summary>
	/// 数据访问类FriendsInfoService。
	/// </summary>
	public class FriendsInfoService
	{
		public FriendsInfoService()
		{}
		#region  成员方法
        /// <summary>
        /// 根据图片路径获取URL
        /// </summary>
        /// <param name="src"></param>
        /// <returns></returns>
        public static string GetUrl(string src) 
        {
            string sql = "select linkurl from FriendsInfo where img1path = '" + src + "'";
            object obj = DBHelperSQL.GetSingle(sql);
            if(obj != null)
            {
                return obj.ToString();
            }
            return "";
        }
        /// <summary>
        /// 得到一个对象实体
        /// </summary>
        public static DataSet GetModelByModelId(int status)
        {

            StringBuilder strSql = new StringBuilder();
            strSql.Append("select id,title,alt,img1path,img2Path,linkurl,orderNum,status,addTime,addUser,infoType from FriendsInfo ");
            strSql.Append(" where status=@status order by orderNum desc");
            SqlParameter[] parameters = {
					new SqlParameter("@status", SqlDbType.Int,4)};
            parameters[0].Value = status;

            Model.FriendsInfo model = new Model.FriendsInfo();
            return DBHelperSQL.Query(strSql.ToString(), parameters);
           
        }

		/// <summary>
		/// 是否存在该记录
		/// </summary>
		public bool Exists(int id)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("select count(1) from FriendsInfo");
			strSql.Append(" where id=@id ");
			SqlParameter[] parameters = {
					new SqlParameter("@id", SqlDbType.Int,4)};
			parameters[0].Value = id;