System.Data.Entity Assembly: EntityFramework.dll An implementation of IDatabaseInitializer that will recreate and optionally re-seed the database only if the database does not exist. To seed the database, create a derived class and override the Seed method. ...
CreateDatabaseIfNotExists:顾名思义,如果数据库不存在则新建数据库 DropCreateDatabaseAlways:无论数据库是否存在,始终重建数据库 DropCreateDatabaseIfModelChanges:仅当领域模型发生变化时才重建数据库 在实际应用当中,我们可以直接使用以上数据库初始化策略,在调用Database对象的Initialize方法时,Entity Framework就会根据...
static void Main() { SpecifyDatabaseName(); } private static void SpecifyDatabaseName() { using (var context = new BreakAwayContext("BreakAwayStringConstructor")) { context.Destinations.Add(new Destination { Name = "Tasmania" }); context.SaveChanges(); } } This new method uses the construct...
You will need to download and install the.NET Core 3.0 preview 5 SDK. Once you have done that, you can use Visual Studio to create a Console .NET Core 3.0 application and install the EF 6.3 preview package from NuGet: PM> Install-Package EntityFramework -pre Next, edit theProgram.csfil...
Instances of this class are typically obtained from Database and it is not designed to be directly constructed in your application code. C# 复制 public class DatabaseFacade : Microsoft.EntityFrameworkCore.Infrastructure.IInfrastructure<IServiceProvider>, Microsoft.EntityFrameworkCore.Infrastructure.I...
When you want to let the Entity Framework create database if it does not exist, just setSqliteDropCreateDatabaseAlways<>orSqliteCreateDatabaseIfNotExists<>as yourIDbInitializer<>. When using Migrations feature you will always useSqliteMigrateDatabaseToLatestVersion<>. ...
Package: Microsoft.EntityFrameworkCore.Relational v9.0.0 Overloads 展開資料表 MigrateAsync(DatabaseFacade, CancellationToken) Asynchronously applies any pending migrations for the context to the database. Will create the database if it does not already exist. MigrateAsync(DatabaseFacad...
1) delete all entities of collection from database, then insert new ones. (in transaction) 2) check new entities one by one and insert if not exist. 3) load all entities of collection from database into memory (single query), check status and do insert. ...
ctx.CreateDatabase(); Assert.True(ctx.DatabaseExists()); ctx.DeleteDatabase(); Assert.False(ctx.DatabaseExists()); As you it could hardly be easier to use. Summary: While Code-Only provides the catalyst to add DDL support to the Entity Framework’s Provider model, this fe...
REQUIRES: using EntityFramework.Utilities; PROVIDER DEPENDENT: This methods uses raw sql to drop connections so only works against sql server Drops the mssql database even if it has connections open. Solves the problem when you are recreating the database in your tests and Management Studio has...