c# 6 0 and net 4 6 framework

EF6 introduces the functionality of an elastic connection, which is the ability to retry a failed database operation. In some complex scenarios, it may be necessary to enable or disable the policy of retry execution, but the EF framework has not yet provided a direct set-up switch that may be added to this configuration in the future. Fortunately, it's easy to implement the setup feature yourself.The simplest way to register an execution policy is thr

MySQL transactional, JDBC transaction operations:See this article in detail: more detailsHttp://www.cnblogs.com/xuyiqing/p/8430214.htmlHow to configure isolation levels in Hibernate:In the re-core configuration file: Specifies the isolation level #hibernate when hibernate operates the database . connection.isolation 1|2|4|8 0001 1 READ UNCOMMITTED 0010 2 Read submitted 0100

();Console.WriteLine ("Number of entities loaded into the context with asnotracking: {0}",Context. Changetracker.entries (). Count ());//output: 0Do not execute queries without the Asnotracking () methodContext. Doctors.include ("Company"). ToList ();Console.WriteLine ("Number of entities loaded into context without asnotracking: {0}",Context. Changetracker.entries (). Count ());//output: 3}The output resu

foo; @Inject Bar bar;}public class Foo { @Inject Bar bar;}@ContextSingletonpublic class Bar {}In this case: new MyRoboActivity().foo != new MyRoboActivity().fooMyRoboActivity a = new MyRoboActivity();a.bar == a.foo.bar[Note] when you use the @ contextsingleton annotation, the object you create will not be recycled in the context lifecycle. This will be destroyed when the context is destroyed, but if your context is not used, it will still exist in the memory. That is to say, if you do not u

UsingTry { } catch (Exception e) { throw; }Unable to catch the detailed exception prompt, the content of E.message is "Validation failed for one or more entities. See ' entityvalidationerrors ' for more details. "If you need to get detailed exception hints, use the1 Try2 {3 return Base. SaveChanges ();4 }5 Catch(Dbentityvalidatione

Entity Framework 6 Recipes 2nd Edition (10-9), entityrecipes 10-9. Use stored procedures for insertion and deletion in many-to-many relationships Problem To use a stored procedure in a load-free multi-to-Multi-Link (the stored procedure only affects the connected tables) Solution Assume that there is a multi-to-many relationship between the Author table (Author) and the Book table. Use the connection table

[Chapter10]. [Insertauthorbook] @AuthorId =1, @BookId =2exec [Chapter10]. [Insertauthorbook] @AuthorId =2, @BookId =3exec [Chapter10]. [Deleteauthorbook] @AuthorId =1, @BookId =1EXEC sp_executesql N ' delete [Chapter10]. [Book] WHERE ([BookId] = @0) ', N ' @0 int ', @0=1How does it work?To map stored procedures to insert and delete operations in many-to-many rel

Address: http://weblogs.asp.net/stephenwalther/archive/2008/06/20/asp-net-mvc-tip-6-call-redirecttoaction-after-submitting-a-form.aspx Abstract: In this Tip, Stephen Walther describes why the RedirectToAction method needs to be called to redirect a submitted form, rather than directly returning a view. Suppose you are using an HTML form to collect information from the user. The HTML form is named HomeContro

Entity Framework 6 Recipes 2nd Edition (10-10), entityrecipes 10-10. The insert, update, and delete operations inherited by TPH are mapped to the stored procedure. Problem TPH inherits the model and maps its insert, modify, and delete operations to the stored procedure. Solution Assume that the database has a Product table describing different types (see Figure 10-13 ). A derived model is created for each p

Entity Framework 6 Recipes 2nd Edition (12-1), entityrecipes The12ChapterCustomizationEF In this section, you can customize entity objects and some features of EF processing. these sections cover a lot of "behind-the-scenes" things, allowing your code to solve things in a more unified manner. For example, you can use a business rule center to perform verification for entities in a unified manner. This secti

. For more information, see "failed ". To load data access DLL, 0x80004005 "-or-what is mscordacwks. dll? " 5. Check the CLR version. Use lm VM mscorwks (#2.0) or Lm vm clr (#4.0) to confirm the CLR version. CLR 2.0 version history: http://blogs.msdn.com/ B /dougste/archive/2007/09/06/version-history-of-the-clr-2-0.aspx CLR 4.0 version history: http://blogs.msdn.com/ B /dougste/archive/2011/09/30/version-history-of-the-clr-

called when executing ' unset ($object->property) '. * * Note If the property isn't defined, this method would do nothing. * If The property is read-only, it'll throw an exception. * * Magic method, implement unset, based on setter implementation, with setter method properties to unset out * * @param string $name The property name * @throw S Invalidcallexception if the property was read only. */ Publicfunction __unset ($name) {$setter='Set'. $name; if(Method_exists ($ This,

ASP. NET provides a powerful and easy-to-use cache mechanism for you to store objects that require a large number of server resources in the memory. Caching these types of resources will greatly improve the applicationProgramPerformance. The cache is implemented by the cache class, And the cache instance is dedicated to each application. The cache lifetime depends on the lifetime of the application. After the application is restarted, the cache obje

Perform a bitwise XOR operation. 　　0100001^00000110 = 10100111(2) The interchange of two values is implemented without the use of temporary variables. For example, Exchange two integer a=10100001,the value ofb=00000110 , can be implemented by the following statement:　　　　A = A^b ; //a=10100111　　　　B = B^a ; //b=10100001　　　　A = A^b ; //a=00000110(3) in assembly language is often used to set the variable 0:Xor a,a(4