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());
        }
    }
}