EntityFramework简单例子

@(编程)

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。