DTcms.DAL/download_attach.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Text;
using System.Data.SqlClient;
using DTcms.DBUtility;
using DTcms.Common;

namespace DTcms.DAL
{
    /// <summary>
    /// 下载附件
    /// </summary>
    public partial class download_attach
    {
        public download_attach()
        { }
        #region  Method
        /// <summary>
        /// 是否存在该记录
        /// </summary>
        public bool Exists(int id)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select count(1) from dt_download_attach");
            strSql.Append(" where id=@id ");
            SqlParameter[] parameters = {
					new SqlParameter("@id", SqlDbType.Int,4)};
            parameters[0].Value = id;

            return DbHelperSQL.Exists(strSql.ToString(), parameters);
        }

        /// <summary>
        /// 修改一列数据
        /// </summary>
        public void UpdateField(int id, string strValue)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("update dt_download_attach set " + strValue);
            strSql.Append(" where id=" + id);
            DbHelperSQL.ExecuteSql(strSql.ToString());
        }

        /// <summary>
        /// 查找不存在的文件并删除已删除的附件及数据
        /// </summary>
        public void DeleteList(SqlConnection conn, SqlTransaction trans, List<Model.download_attach> models, int article_id)
        {
            StringBuilder idList = new StringBuilder();
            if (models != null)
            {
                foreach (Model.download_attach modelt in models)
                {
                    if (modelt.id > 0)
                    {
                        idList.Append(modelt.id + ",");
                    }
                }
            }