1protectedvoidApplication_Start()2{34Database.SetInitializer(newCreateDatabaseIfNotExists<BookDinner.Models.BookDinnerContext>());5Database.SetInitializer(newDropCreateDatabaseIfModelChanges<BookDinner.Models.BookDinnerContext>());6using(varcontext =newBookDinner.Models.BookDinnerContext())//有这段代码,...
本文依次使用Entity Framework支持的Database First、Model First和Code Only三种开发模式实现数据的快速访问。Database First是Entity Framework最早支持,也是最容易上手的一种开发模式,建议初学者选择该模式入手;Model First模式也即面向领域的编程模式,该模式更能体现面向对象的思想;Code Only模式适合对Entity Framework技术...
1)CreateDatabaseIfNotExists:默认的策略。如果数据库不存在,那么就创建数据库。但是如果数据库已存在,而且实体发生了变化,就会出现异常。 2)DropCreateDatabaseIfModelChanges:模型改变时,原来的数据库会被删除,自动重新创建一个新的数据库。 3)DropCreateDatabaseAlways:每次运行都会删除原来的数据库,然后重新生成数据...
Entity Framework 6.2.0 Search System.ComponentModel.DataAnnotations System.ComponentModel.DataAnnotations.Schema System.Data.Entity System.Data.Entity CreateDatabaseIfNotExists<TContext> Database Database Properties Methods DbConfiguration DbConfigurationTypeAttribute DbContext DbContextTransaction DbFunctionAttribu...
Assembly: Microsoft.EntityFrameworkCore.dll Package: Microsoft.EntityFrameworkCore v9.0.0 Source: DatabaseFacade.cs Provides access to database related information and operations for a context. Instances of this class are typically obtained from Database and it is not designed to be directly con...
程序集: Microsoft.EntityFrameworkCore.Relational.dll 包: Microsoft.EntityFrameworkCore.Relational v9.0.0 Source: RelationalDatabaseCreator.cs 异步确定物理数据库是否存在。 不会尝试确定数据库是否包含当前模型的架构。 C# 复制 public virtual System.Threading.Tasks.Task<bool> ExistsAsync(Sys...
<p><a href="https://docs.microsoft.com/ef/core/what-is-new/ef-core-6.0/plan">EF Core 6.0 Release Candidate 1</a> was <a href="https://www.nuget.org/packages/Microsoft.EntityFrameworkCore/6.0.0-rc.1.21452.10">released to NuGet</a> a few weeks ago. This release is the first ...
EntityFrameworkCore.Database.Command[20102] Failed executing DbCommand Failed to Execute URL Failed to load resource: the server responded with a status of 401 (Unauthorized) Failed to load resource: the server responded with a status of 404 (Not Found) signalr/hubs Failed to load resource: ...
context.Database.Exists()) { // if database did not exist before - create it context.Database.Create(); } else { // query to check if MigrationHistory table is present in the database var migrationHistoryTableExists = ((IObjectContextAdapter)context...
使用Entity Framework 和 ASP.NET MVC 3 进行服务器端分页 Julie Lerman 下载代码示例 在我的二月份数据点专栏中,我展示了 jQuery DataTables 插件,及其在客户端无缝处理海量数据的能力。这非常适合您要切片和切块大量数据的 Web 应用程序。本月,我将重点讲述使用返回较小负载的查询来与数据之间进行不同类型的交互...