Entity Framework Code-First(19):Seed Data
Seed Database in Code-First:
You can insert data into your database tables during the database initialization process. This will be important if you want to provide some test data for your application or to provide some default master data for your application.
To seed data into your database, you have to create custom DB initializer, as you created in DB Initialization Strategy, and override the Seed method. The following example shows how you can provide default data for the Standard table while initializing the School database:
public class SchoolDBInitializer : DropCreateDatabaseAlways<SchoolDBContext>
{
protected override void Seed(SchoolDBContext context)
{
IList<Standard> defaultStandards = new List<Standard>(); defaultStandards.Add(new Standard() { StandardName = "Standard 1", Description = "First Standard" });
defaultStandards.Add(new Standard() { StandardName = "Standard 2", Description = "Second Standard" });
defaultStandards.Add(new Standard() { StandardName = "Standard 3", Description = "Third Standard" }); foreach (Standard std in defaultStandards)
context.Standards.Add(std); base.Seed(context);
}
}
Now, set this DB initializer class in context class as below.
public class SchoolContext: DbContext
{ public SchoolContext(): base("SchoolDBConnectionString")
{
Database.SetInitializer(new SchoolDBInitializer()); }
public DbSet<Student> Students { get; set; }
public DbSet<Standard> Standards { get; set; }
}
Entity Framework Code-First(19):Seed Data的更多相关文章
- Entity Framework Tutorial Basics(19):Change Tracking
Change Tracking in Entity Framework: Here, you will learn how entity framework tracks changes on ent ...
- Entity Framework Tutorial Basics(33):Spatial Data type support in Entity Framework 5.0
Spatial Data type support in Entity Framework 5.0 MS SQL Server 2008 introduced two spatial data typ ...
- Entity Framework Tutorial Basics(35):Local Data
Local Data The Local property of DBSet provides simple access to the entities that are currently bei ...
- Entity Framework Code first(转载)
一.Entity Framework Code first(代码优先)使用过程 1.1Entity Framework 代码优先简介 不得不提Entity Framework Code First这个 ...
- Entity Framework Code First (三)Data Annotations
Entity Framework Code First 利用一种被称为约定(Conventions)优于配置(Configuration)的编程模式允许你使用自己的 domain classes 来表 ...
- Entity Framework Code First (二)Custom Conventions
---------------------------------------------------------------------------------------------------- ...
- Entity Framework Code First (一)Conventions
Entity Framework 简言之就是一个ORM(Object-Relational Mapper)框架. Code First 使得你能够通过C#的类来描述一个模型,模型如何被发现/检测就是通 ...
- Entity Framework Tutorial Basics(11):Code First
Code First development with Entity Framework: Entity Framework supports three different development ...
- Entity Framework Code First (七)空间数据类型 Spatial Data Types
声明:本文针对 EF5+, Visual Studio 2012+ 空间数据类型(Spatial Data Types)是在 EF5 中引入的,空间数据类型表现有两种: Geography (地理学上 ...
随机推荐
- 基于Seajs的可控台球碰撞游戏
前言 不记得哪个黑色星期五,贪吃鱼基本完工的时候,产品突然增加需求,要求金币扔出去后不消失,互相可碰撞,其最终结果还要由服务器控制(没错,至今做的所有游戏都有幕后黑手,=W=). 对于碰撞以前只写过一 ...
- Express+Mongoose(MongoDB)+Vue2全栈微信商城项目全记录(一)
最近用vue2做了一个微信商城项目,因为做的比较仓促,所以一边写一下整个流程,一边稍做优化. 项目github地址:https://github.com/seven9115/vue-fullstack ...
- 消息队列mq总结(重点看,比较了主流消息队列框架)
转自:http://blog.csdn.net/konglongaa/article/details/52208273 http://blog.csdn.net/oMaverick1/article/ ...
- FastAdmin 的 Bootstrap-Table 如何合并字段?
FastAdmin 的 Bootstrap-Table 如何合并字段? ★hey-成都 14:13:34 把下面那个字段合并到上面那个字段是用什么方法 ^★暗物质-江西 14:17:21 city加上 ...
- redis client API-----------python
想知道redis针对各种编程语言推荐的接口API实现,请参考http://redis.io/clients/ 选择python语言,则使用https://github.com/andymccurdy/ ...
- Erlang pool management -- Emysql pool optimize
在上一篇关于Emysql pool (http://www.cnblogs.com/--00/p/4281938.html)的分析的最后提到 现在的emysql_conn_mgr gen_server ...
- Xcode工具特性
1.注释 #pragma mark 注释说明#pragma mark - 分类/分组注释说明 2.自定义代码块. 3.多文本编辑框 View>>Assistant Editor
- Contiki学习笔记
http://blog.chinaunix.net/uid-9112803-id-2975824.html
- Java 中的关键字和保留字
关键字: Java 语言中已经事先定义好了的,有着特殊含义和用途 访问控制 类.方法和变量修饰符 程序控制 异常处理 包相关 基本类型 变量引用 public abstract break try i ...
- SpringMVC工作原理图解
SpringMVC的工作原理图: SpringMVC流程 1. 用户发送请求至前端控制器DispatcherServlet. 2. DispatcherServlet收到请求调用HandlerMa ...