ใช้งานได้กับ EF 6.0 และสูงกว่า: สำหรับผู้ที่ต้องการทราบข้อมูลเพิ่มเติมเกี่ยวกับฟังก์ชั่นการบันทึกและเพิ่มคำตอบบางส่วนที่ได้รับ
ขณะนี้คำสั่งใด ๆ ที่ส่งจาก EF ไปยังฐานข้อมูลสามารถบันทึกได้ หากต้องการดูข้อความค้นหาที่สร้างจาก EF 6.x ให้ใช้คำสั่งDBContext.Database.Log property
สิ่งที่ได้รับการบันทึก
- SQL for all different kinds of commands. For example:
- Queries, including normal LINQ queries, eSQL queries, and raw queries from methods such as SqlQuery.
- Inserts, updates, and deletes generated as part of SaveChanges
- Relationship loading queries such as those generated by lazy loading
- Parameters
- Whether or not the command is being executed asynchronously
- A timestamp indicating when the command started executing
- Whether or not the command completed successfully, failed by throwing an exception, or, for async, was canceled
- Some indication of the result value
- The approximate amount of time it took to execute the command. Note that this is the time from sending the command to getting the result object back. It does not include time to read the results.
ตัวอย่าง:
using (var context = new BlogContext())
{
context.Database.Log = Console.Write;
var blog = context.Blogs.First(b => b.Title == "One Unicorn");
blog.Posts.First().Title = "Green Eggs and Ham";
blog.Posts.Add(new Post { Title = "I do not like them!" });
context.SaveChangesAsync().Wait();
}
เอาท์พุท:
SELECT TOP (1)
[Extent1].[Id] AS [Id],
[Extent1].[Title] AS [Title]
FROM [dbo].[Blogs] AS [Extent1]
WHERE (N'One Unicorn' = [Extent1].[Title]) AND ([Extent1].[Title] IS NOT NULL)
-- Executing at 10/8/2013 10:55:41 AM -07:00
-- Completed in 4 ms with result: SqlDataReader
SELECT
[Extent1].[Id] AS [Id],
[Extent1].[Title] AS [Title],
[Extent1].[BlogId] AS [BlogId]
FROM [dbo].[Posts] AS [Extent1]
WHERE [Extent1].[BlogId] = @EntityKeyValue1
-- EntityKeyValue1: '1' (Type = Int32)
-- Executing at 10/8/2013 10:55:41 AM -07:00
-- Completed in 2 ms with result: SqlDataReader
UPDATE [dbo].[Posts]
SET [Title] = @0
WHERE ([Id] = @1)
-- @0: 'Green Eggs and Ham' (Type = String, Size = -1)
-- @1: '1' (Type = Int32)
-- Executing asynchronously at 10/8/2013 10:55:41 AM -07:00
-- Completed in 12 ms with result: 1
INSERT [dbo].[Posts]([Title], [BlogId])
VALUES (@0, @1)
SELECT [Id]
FROM [dbo].[Posts]
WHERE @@ROWCOUNT > 0 AND [Id] = scope_identity()
-- @0: 'I do not like them!' (Type = String, Size = -1)
-- @1: '1' (Type = Int32)
-- Executing asynchronously at 10/8/2013 10:55:41 AM -07:00
-- Completed in 2 ms with result: SqlDataReader
ในการเข้าสู่ไฟล์ภายนอก:
using (var context = new BlogContext())
{
using (var sqlLogFile = new StreamWriter("C:\\temp\\LogFile.txt"))
{
context.Database.Log = sqlLogFile.Write;
var blog = context.Blogs.First(b => b.Title == "One Unicorn");
blog.Posts.First().Title = "Green Eggs and Ham";
context.SaveChanges();
}
}
ข้อมูลเพิ่มเติมที่นี่: การบันทึกและสกัดกั้นการทำงานของฐานข้อมูล
