linq to sql初步

1在数据库中设计一个表

2设计一个相关的实体类

注意类名和字段的attribute

using System;
using System.Collections.Generic;
using System.Linq;
using System.Data.Linq;
using System.Data.Linq.Mapping;
using System.Text;
using Life365.Common;

namespace Life365.Entity
{
    ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
    /// 系统日志实体类
    ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
    [Table(Name="dev.T_SYS_LOGGER")]
    publicclass LoggerEntity
    {      
        public LoggerEntity()
        { }

        privatestring _sl_logid;
        private DateTime  _sl_createtime = DateTime.Now;
        privatestring _sl_userid;
        privatestring _sl_username;
        private SysEnum.LoggerType _sl_logtype;
        //private int _sl_logtype;
privatestring _sl_logurl;
        privatestring _sl_modulename;
        privatestring _sl_logdetail;
        privatestring _sl_ip;
        privatestring _sl_appid;

        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 日志编号
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        publicstring SL_LogID
        {
            set { _sl_logid = value; }
            get { return _sl_logid; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 创建时间
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        public DateTime SL_CreateTime
        {
            set { _sl_createtime = value; }
            get { return _sl_createtime; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 操作员编号
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        publicstring SL_UserID
        {
            set { _sl_userid = value; }
            get { return _sl_userid; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 操作人用户名
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        publicstring SL_UserName
        {
            set { _sl_username = value; }
            get { return _sl_username; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 日志类型
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        public SysEnum.LoggerType SL_LogType
        {
            set { _sl_logtype = value; }
            get { return _sl_logtype; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 记录页面
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        publicstring SL_LogUrl
        {
            set { _sl_logurl = value; }
            get { return _sl_logurl; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        ///模块名称
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        publicstring SL_ModuleName
        {
            set { _sl_modulename = value; }
            get { return _sl_modulename; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 详细信息
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        publicstring SL_LogDetail
        {
            set { _sl_logdetail = value; }
            get { return _sl_logdetail; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 日志操作人IP
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        publicstring SL_IP
        {
            set { _sl_ip = value; }
            get { return _sl_ip; }
        }
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        /// 系统编号
        ///<SUMMARY></SUMMARY><SUMMARY></SUMMARY>
        [Column]
        publicstring SL_AppID
        {
            get { return _sl_appid; }
            set { _sl_appid = value; }
        }
    }
}

3访问数据库的代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.Linq;
using Life365.Entity;

namespace testweb
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            DataContext context = new DataContext("Data Source=192.168.3.18;Initial Catalog=dbserver;User ID=sa;Password=allen");
            context.Log = Console.Out;
            var b = from v in context.GetTable().Skip(18).Take(18) select new { v.SL_LogDetail };     
            foreach (var a in b)
            {
                Response.Write(a.SL_LogDetail + "
");
            }
        }
    }
}

这里假设一页18条数据，访问第二页

看来分页的存储过程已经不需要了

另：
此访问用到了数据的延迟加载

并非把所有的字段全部读出来，而是只读了一个字段 SL_LogDetail