mvc 4 + EF 6实现code first。
第一步：建立一个测试数据库，并添加表和两条数据：
第二步：新建项目
EF6 构建结构
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Hello
{
public class Hello
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
}
}
以下是处理表关联的两种方式：
那么第一步创建实体就完成了.现在就是第二步了.创建上下文.创建上下文我们就写一个上下的类HelloDbContext.cs：
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Hello
{
class HelloDbContext:DbContext
{
public HelloDbContext()
: base("name=Hello")//与配置文件对应
{
}
public DbSet<Hello> Hello { get; set; }
}
}
在主函数里创建一个数据库，给表添加点字段，测试一下成功没。
失败！
方式二：
app.config
<?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" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<entityFramework codeConfigurationType="MySql.Data.Entity.MySqlEFConfiguration, MySql.Data.Entity.EF6">
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework"/>
<providers>
<provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
<connectionStrings>
<add name="HelloEntities" connectionString="Data Source=localhost;port=3306;Initial Catalog=helloweb;user id=root;password=0301;" providerName="MySql.Data.MySqlClient"/>
</connectionStrings>
</configuration>
MyContext.cs
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace TestOne
{
//public class HelloDbContext:DbContext
//{
// public HelloDbContext() : base("name=HelloEntities") { }
// public DbSet<HelloTable> HelloTable { get; set; }
//}
public class MyContext : DbContext
{
public MyContext()
: base("name=HelloEntities")
{
}
public DbSet<hellotable> hellotables { get; set; }
}
public class hellotable
{
public int Id { get; set; }
public string Name { get; set; }
}
class Program
{
static void Main(string[] args)
{
//Database.SetInitializer(new DropCreateDatabaseAlways<MyContext>());
var context = new MyContext();
context.hellotables.Add(new hellotable {Name = "55" });
context.SaveChanges();
}
}
}
之后再做分离吧，晚安，做个好梦！
