how to update database

1. EF Code first creates a databaseCreate a new Console application portal and add entityframework through the Package Manager console.In the Package Manager console, execute the following statement to install EntityFramework.Pm> Install-package

1. EF Code first creates a databaseCreate a new Console application portal and add entityframework through the Package Manager console.In the Package Manager console, execute the following statement to install EntityFramework.Pm> Install-package

1. EF Code first creates a databaseCreate a new Console application portal and add entityframework through the Package Manager console.In the Package Manager console, execute the following statement to install EntityFramework.Pm> Install-package

Http://www.cnblogs.com/libingql/p/3330880.html 1. EF Code First creates a databaseCreate a new Console application portal and add entityframework through the Package Manager console.In the Package Manager console, execute the following statement to

nonsense Words that year, in a spring midday, met the charming lilac girl, and then bowed in her pomegranate skirt, so far, the lilac Girl is ORM thought. The so-called Orm thought, my understanding is that according to certain rules, the object in

I. Setting up Code First Data migration for model changes1, tools---Library Package Manager, Package Manager console, input "Enable-migrations" orEnable-migrations-contexttypename Mvc.Models.DataContextEnable-migrations-contexttypename namespace.

Problem1. When using entityframework to access MySQL, you will encounter some problems when using the migration to build the database or update the database.2.entityframework.extended support for MySQL is not very complete, where modifications are

Reference:https://msdn.microsoft.com/en-us/data/jj591621Http://www.itnose.net/detail/6105449.htmlHttp://www.tuicool.com/articles/Q7JRR32Open: Tools---NuGet Package Manager--Package management console, use the appropriate commands as followsEnable

If the Model class (Database context class context and Poco Class) changes, and the structure in the database is inconsistent, the system throws an exception by default. You might consider using code-first migration.Code-First migration performs

Analysis of the Series 2 and the basic tutorial of the series (the modern ASP. NET sample development framework ), ABP is short for "ASP. NET Boilerplate Project (ASP. NET sample Project. ASP. NET Boilerplate is a new starting point for developing

EntityFramework 6.x learn how to implement distributed transactions through context migration. entityframework6.x Preface Since the project. NET Core platform has used EntityFramework Core and has never touched EntityFramework 6. version x.

Update-Database Specify the-verbose flag to view the SQL statements applied to the target database. Applying explicit migration: [201409180500514_yu3]. Applying explicit migration: 201409180500514_yu3. The database cannot be updated to match the

If the three commands fail to be executed after the database is migrated, perform the following steps to migrate the database. 1: Enable-Migrations 2: Add-Migration Student. 3: update-database Generally, the above three commands are successfully

Terminate force application all // force terminate all connectionsTerminate // clear all DB2 background processesRelated details can be found in db2ic The database is a DB2 database. When deleting a large table through Delete, the following error

In this section, you will use Entity Framework code first to perform model class operations. So that these operations and changes can be applied to the database. By default, as you did in the previous tutorial, Entity Framework code first is used

Error message: the 'title' Column cannot be inserted with a null value. Table 'mvccorperation. Models. corperationdbcontext. DBO. Articles '; the column cannot have a null value. Update failed. The statement has been terminated. Environment: A

This article is a relatively independent article, mainly on the non-loss of data for the database structure upgrade.As we explained the EF features earlier (see the third article), we've covered a way to update the database:EF compares model and

You have learned how to handle concurrency exceptions before, and in this section you will learn how to implement inheritance.In object-oriented programming, you can use inheritance to reuse code. Next you will modify the instructor and student

If a file or assembly fails to load "Microsoft.VisualStudio.Shell, version=10.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a" Or one of its dependencies. The system cannot find the file specified.Reinstall EF Command Install-package

Issue: After migrating the database using the Entity Framework, each time you modify the code (not the Model code), the error is:Models that support the "Xxxdbcontext" context have changed since the database was created. Consider migrating the