Entity Framework 数据库初始化四种策略

策略一：数据库不存在时重新创建数据库

 Database.SetInitializer<testContext>(new CreateDatabaseIfNotExists<testContext>());

策略二：每次启动应用程序时创建数据库

 Database.SetInitializer<testContext>(new DropCreateDatabaseAlways<testContext>());

策略三：模型更改时重新创建数据库

 Database.SetInitializer<testContext>(new DropCreateDatabaseIfModelChanges<testContext>());

策略四：从不创建数据库

 Database.SetInitializer<testContext>(null);

Entity Framework数据库初始化示例

 using System.Data.Entity;
 using System.Data.Entity.Infrastructure;
 using Web.Models.Mapping;

 namespace Web.Models
 {
     public class testContext : DbContext
     {
         static testContext()
         {
             Database.SetInitializer<testContext>(null);
         }

         public testContext()
             : base("Name=testContext")
         {
         }

         public DbSet<Person> People { get; set; }

         protected override void OnModelCreating(DbModelBuilder modelBuilder)
         {
             modelBuilder.Configurations.Add(new PersonMap());
         }
     }
 }