我們先在數據庫中建立一個Book表：

CREATE TABLE [dbo].[Book](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [BookName] [nvarchar](50) NULL,
    [BookDescription] [nvarchar](50) NULL,
    [ISBN] [nvarchar](20) NULL,
    [CreateTime] [datetime] NULL,
 CONSTRAINT [PK_Book] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)
 
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[Book] ADD  CONSTRAINT [DF_Book_CreateTime]  DEFAULT (getdate()) FOR [CreateTime]
GO

然後插入如下數據：

INSERT [dbo].[Book] ([BookName
 
], [BookDescription], [ISBN]) VALUES (N‘Chinese‘, N‘Chinese‘, N‘0001‘)
GO
INSERT [dbo].[Book] ([BookName], [BookDescription], [ISBN]) VALUES (N‘English‘, N‘English‘, N‘0002‘)
GO
INSERT [dbo].[Book] ([BookName], [BookDescription], [ISBN]) VALUES (N‘Japanese‘, N‘Japanese‘, N‘0003‘)
GO
INSERT [dbo].[Book]
 
 ([BookName], [BookDescription], [ISBN]) VALUES (N‘Russian‘, N‘Russian‘, N‘0004‘)
GO
INSERT [dbo].[Book] ([BookName], [BookDescription], [ISBN]) VALUES (N‘Italian‘, N‘Italian‘, N‘0005‘)
GO

查詢Book表的數據，如下圖所示：

現在我們使用EF Core將Book表映射到.NET Core控制臺項目中的Book實體上，Book實體如下所示：

using System;
using System.Collections.Generic;

namespace EFCoreDB.Entities
{
    public partial class Book
    {
        public int Id { get; set; }
        public string BookName { get; set; }
        public string BookDescription { get; set; }
        public string Isbn { get; set; }
        public DateTime? CreateTime { get; set; }
    }
}

EF Core 2.0中開啟Transaction事務會對DbContext創建和關閉數據庫連接的行為有所影響