EF POCO (自定义实体类) 创建过程-优快云博客

本文链接：https://blog.youkuaiyun.com/newegg2009/article/details/7641009

本文详细介绍了如何使用SQL Server构建数据库表、创建EDMX文件、映射实体类及实现与ObjectContext的集成，最终展示如何通过POCO进行数据操作。

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1 建表

CREATE TABLE [dbo].[TEST](
    [v1] [int] IDENTITY(1,1) NOT NULL,
    [v2] [varbinary](50) NOT NULL,
    [v3] [datetime] NOT NULL,
 CONSTRAINT [PK_TEST] PRIMARY KEY CLUSTERED
(
    [v1] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

2 edmx创建

3 . 建立实体类，和映射对应实体类（本例采用ObjectContext方式）

1.）实体类 TEST.cs

实体类的名字一定要和edmx的实体类名字对应

实体类的属性要与Edmx中属性对应，包括属性是否为空等

namespace WebApplication3
{
    public partial class TEST
    {
        public int v1 { get; set; }
        public string v2 { get; set; }
        public  Nullable<DateTime> v3 { get; set; }
    }

    public partial class TESTEntities : ObjectContext
    {
        public ObjectSet<TEST> TEST
        {
            get { return _test ?? (_test = CreateObjectSet<TEST>("TESTs")); }
        }
        private ObjectSet<TEST> _test;
    }
}

2）. 映射实体类TESTEntities.cs

对应Webconfig中connectstring的名字

<add name="TESTEntities" connectionString="metadata=res://*/test.csdl|res://*/test.ssdl|res://*/test.msl;provider=System.Data.SqlClient;provider connection string="Data Source=JACKIE-PC\SQLSERVER2008;Initial Catalog=TEST;User ID=sa;Password=Fabric2010;MultipleActiveResultSets=True"" providerName="System.Data.EntityClient" />

namespace WebApplication3
{
    public partial class TESTEntities : ObjectContext
    {
        public const string ConnectionString = "name=TESTEntities";
        public const string ContainerName = "TESTEntities";

        #region Constructors

        public TESTEntities()
            : base(ConnectionString, ContainerName)
        {
        }
        #endregion
    }
}

4. 映射关系完成，我们可以使用自己定义的实体类了，POCO创建完毕

   protected void Page_Load(object sender, EventArgs e)
        {
            using (TESTEntities db = new TESTEntities())
            {
                var ctt = db.TEST.ToList();
                this.gdvTest.DataSource = ctt;
                this.gdvTest.DataBind();
            }
        }

完整实例下载地址：

http://download.youkuaiyun.com/detail/newegg2009/4362265