EntityFramework简单例子

@(编程)

这个例子是用vs2013连接mysql数据库。

1. NuGet安装EF和mysql

略

2. 对象

namespace EFDemo
{
    class Student
    {
        public string Id { get; set; }

        public string Name { get; set; }

    }
}

3. Context

using System.Data.Entity;

namespace EFDemo
{
    class DefaultContext : DbContext
    {
        public DbSet<Student> Students { get; set; }
    }
}

4. 配置文件

<?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>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.9.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d">
      </provider>
    </providers>
  </entityFramework>
  <connectionStrings>
    <add name="DefaultContext" providerName="MySql.Data.MySqlClient" connectionString="Server=127.0.0.1; database=test10; uid=root; password=password;"/>
  </connectionStrings>
  <system.data>
    <DbProviderFactories>
      <remove invariant="MySql.Data.MySqlClient" />
      <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.9.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
    </DbProviderFactories>
  </system.data>
</configuration>

5. 调用程序

using MySql.Data.Entity;
using System;
using System.Data.Entity;

namespace EFDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            DbConfiguration.SetConfiguration(new MySqlEFConfiguration());
            var context = new DefaultContext();
            Student item = new Student();
            item.Id = Guid.NewGuid().ToString();
            item.Name = "keke";
            context.Students.Add(item);
            context.SaveChanges();
        }
    }
}

程序执行后，自动创建数据库与表，非常方便。