NopCommerce架构分析之(三)EntityFramework数据库初试化及数据操作

接口IEfDataProvider 的实体类SqlServerDataProvider的数据库初始化方法如下：

/// <summary> 
/// Set database initializer 
/// </summary> 
public override void SetDatabaseInitializer() 
{ 
 //pass some table names to ensure that we have nopCommerce 2.X installed 
 var tablesToValidate = new[] {"Customer", "Discount", "Order", "Product", "ShoppingCartItem"}; 

 //custom commands (stored proedures, indexes) 

 var customCommands = new List<string>(); 
 //use webHelper.MapPath instead of HostingEnvironment.MapPath which is not available in unit tests 
 customCommands.AddRange(ParseCommands(HostingEnvironment.MapPath("~/App_Data/SqlServer.Indexes.sql"), false)); 
 //use webHelper.MapPath instead of HostingEnvironment.MapPath which is not available in unit tests 
 customCommands.AddRange(ParseCommands(HostingEnvironment.MapPath("~/App_Data/SqlServer.StoredProcedures.sql"), false)); 
 
 var initializer = new CreateTablesIfNotExist<NopObjectContext>(tablesToValidate, customCommands.ToArray()); 
 Database.SetInitializer(initializer); 
} 

另外，EntityFramework本事是ORM框架，通过数据库访问上下文建立与数据库的连接及实体与数据表的对应广西。并通过创建IRepository<T>的泛型实体类来实现对每一种数据的处理，也就是所谓的Dao层。业务逻辑层通过每种实体的数据访问仓库Repository<T>来进行数据库操作。