EntityFramework 5.0 6.0 CodeFirst SqlCompact 4 sp1

1, 安装sql server compact edition 4 sp1 Runtime

2, 安装sql server ce tool box for to Management or create local DB.

 

http://sqlcetoolbox.codeplex.com/

 

3, 以往的 Entity Framework 操作方式也不一樣了，先上 NuGet 取得 Entity Framework.SqlServerCompact

 

Code First with SQL CE  a sample project using Entity Framework 6 with code first. 

http://www.codeproject.com/Articles/680116/Code-First-with-SQL-CE

 

 

Entity Framework 6 & SQL Server Compact

http://dotnet.dzone.com/users/erikej

 

重要提示：配置文件中 configSections 要在  connectionStrings 节下面，不然会报错。

  <system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SqlServerCe.4.0" />
      <add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"/>
    </DbProviderFactories>
  </system.data>
  <connectionStrings>
    <add name="ProductContext" connectionString="Data Source=MyDB.sdf" providerName="System.Data.SqlServerCE.4.0"/>
    <!--<add name="sqliteContext"
 connectionString="Data Source=E:\WHPCodeLiberary\temp\SqlLiteDBs\TestDB.s3db;Version=3;New=True;"
 providerName="System.Data.SQLite"
  />-->
  </connectionStrings>

 重要提示：配置文件中 configSections 要在  connectionStrings 节下面，不然会报错。

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
  </configSections>
  <connectionStrings>
    <add name="CFSqlCe.Dal.DvdContext" 
         providerName="System.Data.SqlServerCe.4.0" 
         connectionString="Data Source=D:\DvdDatabase.sdf" />
  </connectionStrings>
  <entityFramework>
    <providers>
      <provider invariantName="System.Data.SqlServerCe.4.0" type="System.Data.Entity.SqlServerCompact.SqlCeProviderServices, EntityFramework.SqlServerCompact" />
    </providers>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlCeConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="System.Data.SqlServerCe.4.0" />
      </parameters>
    </defaultConnectionFactory>
  </entityFramework>
</configuration>

    public class Category
    {
        public string CategoryId { get; set; }
        public string Name { get; set; }

        public virtual ICollection<Product> Products { get; set; }

    }

    public class Product
    {
        public int ProductId { get; set; }
        public string Name { get; set; }
        public string CategoryId { get; set; }
        public virtual Category Category { get; set; }
    }

    /// <summary>
    /// 4.create context
    /// </summary>
    public class ProductContext : DbContext
    {
        public DbSet<Category> Categories { get; set; }
        public DbSet<Product> Products { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Product>().Property(s => s.Name).IsRequired();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Database.SetInitializer<ProductContext>(new DropCreateDatabaseIfModelChanges<ProductContext>());

            using (var db = new ProductContext())
            {
                var food = db.Categories.Find("FOOD");
                if (food == null)
                {
                    food = new Category { CategoryId = "FOOD", Name = "Foods" };
                    db.Categories.Add(food);
                }
                Console.Write("Please enter a name for a new food: ");
                var productName = Console.ReadLine();
                var product = new Product { Name = productName, Category = food };
                db.Products.Add(product);

                

                int recordsAffected = db.SaveChanges();

                Console.WriteLine("Save {0} entities to the database,press any key to exit.", recordsAffected);
                var allFoods = from p in db.Products
                               where p.CategoryId == "FOOD"
                               orderby p.Name
                               select p;

                foreach (var item in allFoods)
                {
                    Console.WriteLine("- {0}", item.Name);
                }
                Console.ReadKey();
            }
        }
    }