code first migrations

Learning ASP. net mvc (8) -- "Code First Migrations" tool, mvcmigrations In this article, we will learn how to use the "Code First Migrations" (also known as the Code First feature) tool of the Entity Framework and use the "Migration" feature to modify the model class, synch

In this article, we learned how to use the Entity Framework's Code First migrations (also known as the Code -first feature) tool to make some modifications to the model class using the migration feature, while simultaneously updating the table structure of the corresponding database.By default, when you use the Entity Framework's

UserInfo Userinfo{get;set;}}Note: The difference is that we add a length limit to the TeacherName attribute. Next, we're going to start persisting this model into the database (we're just modifying the property now, the length of this field in the database is nvarchar (max), not nvarchar (10))1: Configure the database connection in config: 2: Open the NuGet console:3: Run command enable-migrationsThe following error may occur:Checking If the context targets an existing database ... Detected da

now, the length of this field in the database is nvarchar (max), not nvarchar (10))1: Configure the database connection in config:[HTML]View Plaincopyprint? connectionstrings > addname= "Testusersdb" connectionstring= " integratedsecurity=sspi; Persistsecurityinfo=false;initialcatalog=testusersdb;datasource=xcl-pc\sqlexpress " providername= "System.Data.SqlClient" /> connectionstrings> 2: Open the NuGet console:3: Run command enable-migrationsThe fol

1>, in the Package Manager console, execute the statement:Pm> enable-migrations-enableautomaticmigrationsAfter execution succeeds, add the Migrations folder to the application code structure, and generate the class file Configuration.cs.2>, in the Package Manager console, execute the statement:Pm> add-migration InitialcreateAfter successful execution, new class f

model changes, the current database is deleted and the new database is rebuilt.After the code executes, the resulting database:　　2. EF Code First Database migration2.1. Build the DatabaseModify the static constructor of the class file PortalContext.cs to remove the setting that removes the current database from rebuilding the new database when the database model has changed.　　Static Portalcontext () { d

constructor of the class file PortalContext.cs to remove the setting that removes the current database from rebuilding the new database when the database model has changed.Static Portalcontext () { database.setinitializer1>, in the Package Manager console, execute the statement:Pm> enable-migrations-enableautomaticmigrationsAfter successful execution, add the Migrations folder to the Portal console appl

EF Code First Migrations database migration, efmigrations1. EF Code First creates a database Step 1: Create a console application Step 2: Install EntityFramework Run the following statement on the Package Manager Console: PM> Install-Package EntityFramework2. Project Structure Two entities and ing. The PortalContext code