信息内容操作类

namespace dal
{
    public class oledo
    {
        private olehelp olehelpex;
        public oledo()
        {
            olehelpex = new olehelp();
        }
        /// <summary>
        /// 选择所有数据
        /// </summary>
        /// <returns></returns>
        public DataTable selectall()
        {
            DataTable dt = new DataTable();
            //dt = olehelpex.execquery("selectall", CommandType.StoredProcedure);
            dt = olehelpex.execquery("SELECT i.id, i.filetitle, i.filecontent, i.filename, i.filedate, c.catename  FROM category AS c INNER JOIN info AS i ON c.id=i.caid order by i.filedate desc", CommandType.Text);
            return dt;
        }
        /// <summary>
        /// 插入
        /// </summary>
        /// <param name="filetitle"></param>
        /// <param name="filecontent"></param>
        /// <param name="filename"></param>
        /// <param name="caid"></param>
        /// <returns></returns>
        public bool insertinfo(string filetitle, string filecontent, string filename, string caid)
        {
            bool flag = false;
            OleDbParameter[] paras = new OleDbParameter[] { new OleDbParameter("@filetitle", filetitle), new OleDbParameter("@filecontent", filecontent), new OleDbParameter("@filename", filename), new OleDbParameter("@caid", caid) };
            int res = olehelpex.execnonquery("insert into info(filetitle,filecontent,filename,caid) values(@filetitle,@filecontent,@filename,@caid)", paras, CommandType.Text);
            if (res > 0)
            {
                flag = true;
            }
            return flag;
        }
        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public bool deleinfo(string id)
        {
            bool flag = false;
            OleDbParameter[] paras = new OleDbParameter[] { new OleDbParameter("@id", id) };
            int res = olehelpex.execnonquery("delete from info where id=@id", paras, CommandType.Text);
            if (res > 0)
            {
                flag = true;
            }
            return flag;

        }
        /// <summary>
        /// 更新
        /// </summary>
        /// <param name="filetitle"></param>
        /// <param name="filecontent"></param>
        /// <param name="caid"></param>
        /// <param name="id"></param>
        /// <returns></returns>
        public bool fixinfo(string filetitle, string filecontent,string caid,string id)
        {
            bool flag = false;
            OleDbParameter[] paras = new OleDbParameter[] { new OleDbParameter("@filetitle", filetitle), new OleDbParameter("@filecontent", filecontent), new OleDbParameter("@caid",caid), new OleDbParameter("@id", id) };
            int res = olehelpex.execnonquery("update info set filetitle=@filetitle,filecontent=@filecontent,caid=@caid where id=@id", paras, CommandType.Text);
            if (res > 0)
            {
                flag = true;
            }
            return flag;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.OleDb;