EntityFramework 多数据库链接,MySql,SqlServer,Oracel等

环境：EntityFramework5.0，MySql5.6，MSSQL2012

EF是强大的ORM工具，真正意义上的多数据库链接指的是不同类型的数据库，以及同种类型的数据库多个库，EF很好的支持这一点，下面简单演示下：

创建一个MVC4.0，Framework4.5的基本项目，然后重点是WebConfig配置：


<?xml version="1.0" encoding="utf-8"?>

<!--

  For more information on how to configure your ASP.NET application, please visit

  http://go.microsoft.com/fwlink/?LinkId=152368

  -->

<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=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />

  </configSections>

  <connectionStrings>

    //无论多少类型，多少个同类型数据库，尽管加吧

    <add name="DefaultDB" connectionString="Server=localhost;Uid=sa;Pwd=ovenjackchain;DataBase=CN9295;" providerName="System.Data.SqlClient"/>

    <add name="DbConMySql" providerName="MySql.Data.MySqlClient"  connectionString="Data Source=172.16.205.61;Port=3306;Initial Catalog=WMC;uid=assp;pwd=assp123;" />

  </connectionStrings>

  <appSettings>

    <add key="webpages:Version" value="2.0.0.0" />

    <add key="webpages:Enabled" value="false" />

    <add key="PreserveLoginUrl" value="true" />

    <add key="ClientValidationEnabled" value="true" />

    <add key="UnobtrusiveJavaScriptEnabled" value="true" />

  </appSettings>

  <system.web>

    <httpRuntime targetFramework="4.5" />

    <compilation debug="true" targetFramework="4.5" />

    <authentication mode="Forms">

      <forms loginUrl="~/Account/Login" timeout="2880" />

    </authentication>

    <pages>

      <namespaces>

        <add namespace="System.Web.Helpers" />

        <add namespace="System.Web.Mvc" />

        <add namespace="System.Web.Mvc.Ajax" />

        <add namespace="System.Web.Mvc.Html" />

        <add namespace="System.Web.Optimization" />

        <add namespace="System.Web.Routing" />

        <add namespace="System.Web.WebPages" />

      </namespaces>

    </pages>

    <profile defaultProvider="DefaultProfileProvider">

      <providers>

        <add name="DefaultProfileProvider" type="System.Web.Providers.DefaultProfileProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />

      </providers>

    </profile>

    <membership defaultProvider="DefaultMembershipProvider">

      <providers>

        <add name="DefaultMembershipProvider" type="System.Web.Providers.DefaultMembershipProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />

      </providers>

    </membership>

    <roleManager defaultProvider="DefaultRoleProvider">

      <providers>

        <add name="DefaultRoleProvider" type="System.Web.Providers.DefaultRoleProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />

      </providers>

    </roleManager>

    <sessionState mode="InProc" customProvider="DefaultSessionProvider">

      <providers>

        <add name="DefaultSessionProvider" type="System.Web.Providers.DefaultSessionStateProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" />

      </providers>

    </sessionState>

  </system.web>

  <system.webServer>

    <validation validateIntegratedModeConfiguration="false" />

    <handlers>

      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />

      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />

      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />

      <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />

      <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />

      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

    </handlers>

  </system.webServer>

  <runtime>

    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

      <dependentAssembly>

        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />

        <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />

      </dependentAssembly>

      <dependentAssembly>

        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />

        <bindingRedirect oldVersion="1.0.0.0-4.0.0.0" newVersion="4.0.0.0" />

      </dependentAssembly>

      <dependentAssembly>

        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />

        <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />

      </dependentAssembly>

    </assemblyBinding>

  </runtime>
下面这里注释掉，否则会默认根据默认工厂来找

  <!--<entityFramework>

    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">

      <parameters>

        <parameter value="v11.0" />

      </parameters>

    </defaultConnectionFactory>

    --><!--<defaultConnectionFactory type="MySql.Data.Entity.MySqlConnectionFactory, MySql.Data.Entity.EF5">

    </defaultConnectionFactory>--><!--

  </entityFramework>-->

  <system.data>
如果你还有其他的数据库类型，那么只需要在这里加配置即可

    <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=6.7.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />

    </DbProviderFactories>

  </system.data>

</configuration>

以上配置部分，斜体和红字的是我修改过的，其他都是项目自动产生的。

测试：


using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data.Entity;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using MySql.Data.Entity;

using System.Data.Entity.ModelConfiguration.Conventions;

using System.ComponentModel.DataAnnotations;


namespace MvcEFMySql.Controllers

{

    //这里是mysql的

    public class MyContext : DbContext

    {


public MyContext(string DefaultDb)

            : base(DefaultDb)

        {

            //Database.DefaultConnectionFactory =  MySql.Data.MySqlClient.MySqlClientFactory;

            //Database.Connection.ConnectionString = ;

            Database.SetInitializer<MyContext>(null);

        }


protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            //已经存在的数据库，不然会出现负数

            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

            base.OnModelCreating(modelBuilder);

        }


public DbSet<User> user { get; set; }

    }

    //这里是sqlserver的

    public class SQLContext : DbContext

    {

        public SQLContext(string DefaultDb)

            : base(DefaultDb)

        {

            //Database.DefaultConnectionFactory =  MySql.Data.MySqlClient.MySqlClientFactory;

            //Database.Connection.ConnectionString = ;

            Database.SetInitializer<MyContext>(null);

        }


protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            //已经存在的数据库，不然会出现负数

            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

            base.OnModelCreating(modelBuilder);

        }


public DbSet<DO_Category> category { get; set; }

    }


public class DO_Category

    {

        public DO_Category() { }


[Key]

        public Guid Id { get; set; }

        /// <summary>

        /// 类目

        /// </summary>

        public string Category { get; set; }


/// <summary>

        /// 图标

        /// </summary>

        public string IconName { get; set; }


/// <summary>

        /// 排序

        /// </summary>

        public int OrderIndex { get; set; }


/// <summary>

        /// 父节点

        /// </summary>

        public Guid FatherId { get; set; }


public string CreateUser { get; set; }


public DateTime CreateTime { get; set; }


public string ModifyUser { get; set; }


public DateTime? ModifyTime { get; set; }


[Timestamp]

        public Byte[] RowVersion { get; set; }


}


public class User

    {

        public Guid Id { get; set; }

        public string UserName { get; set; }

    }


public class HomeController : Controller

    {

        //

        // GET: /Home/


public ActionResult Index()

        {

            //Database.SetInitializer(new DropCreateDatabaseAlways<MyContext>());

//操作MySql数据库

            var context = new MyContext("DbConMySql");

            context.user.Add(new User { Id = Guid.NewGuid(), UserName = "jackchain" });

            context.SaveChanges();

           var userlist= context.user.ToList();

//获取SQLServer数据库内容

           var sqlc = new SQLContext("DefaultDB");

           ViewBag.clist = sqlc.category.ToList();

           return View(userlist);

        }

    }

}

ok尽情品味吧。EF6的webconfig稍加不同。重点还是webconfig配置

mysql中文乱码问题，请在连接串最后加：Character Set=utf8;

EntityFramework 多数据库链接,MySql,SqlServer,Oracel等,布布扣,bubuko.com

时间： 2024-08-02 18:37:52

EntityFramework 多数据库链接,MySql,SqlServer,Oracel等的相关文章

数据库链接 mysql，sqlserver

/// <summary> /// 生产工厂对象 /// </summary> public class DBFactory { /// <summary> /// 创造实例 /// </summary> /// <typeparam name="T">类型</typeparam> /// <param name="assemblyString">程序集名称</param>

Ubuntu中部署Django项目的配置与链接MySQL

Django的简介 MVT模式的介绍创建项目的虚拟环境 本次使用的是pip安装 一.更新 sudo apt update 二.安装pip sudo apt install python3-pip 三.升级pip(可忽略) sudo python3 -m pip install --upgrade pip 参考链接:https://my.oschina.net/doctorlzr1988/blog/1560215 四.安装virtualenv.virtualenvwrapper sudo pip3

SQLServer 远程链接MySql数据库

第一步:安装MySQL odbc driver 在SQL SERVER所在主机上安装MYSQL ODBC Driver; 下载地址:http://dev.mysql.com/downloads/connector/odbc/ 找到合适自己操作系统的版本下载并安装 第二步:配置ODBC数据源 打开[管理工具]—>[数据源(ODBC)],选择[系统DSN],点击[添加],选择[MySQL ODBC 5.3  Unicode Driver],完成 输入自定义的数据源名称XXX和描述,输入要连接的mys

JDBC链接Mysql数据库+执行sql

package com.wangbingan.utils; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; /**  * JDBC链接数据库  *   * @author Administrator  *   */ public class JdbcUtil { public static void main(Strin

php链接Mysql数据库

PHP链接Mysql数据库: 1:首先打开软件(WampServer再点击鼠标左键,再点phpMYAdmin最后打开的页面是 再填用户名,密码可以写不可写,最后再点执行就出现这个页面 再点test新建表名)最后就在mysql里面创建表格,在表格里面可以添加数据.查询数据.删除数据.修改数据 例: (1):添加数据INSERT INTO `message`(`id`, `user`, `title`, `content`, ` lda te`) VALUES ('','张三','学习php','飞

playframework链接MySQL数据库的问题

Scala 在米国已经发展的如火如荼,有些人甚至说Scala将成为未来语言的头号交椅.简洁的代码和表达式的写法让很多人倍感舒适,函数式和面向对象的编程范式也让其能在多种场合游刃有余的被使用.加之它是跑在JVM虚拟机上的,可以完美的调用java,让很多现存的技术可以继续保留,降低了维护成本.但是,Scala过度复杂的语法也让无数开发者头疼,知乎上有人说他是“全宇宙最难学的语言”,我想说“呵呵”,事在人为嘛,我们要有“铁杵磨成针”的态度,不会的慢慢学,年轻就应该这么任性!! 好了,扯了这么多废话,让

PHP链接Mysql数据库的小知识

1:在PHP写隔行变色有三种写法(但是最好的是用js+css) (1)CSS: tr:nth-child(even){             background: #cad9ea;         } even:代表偶数: ood:代表奇数:   (2)PHP: <?php                 if($n %2 == 0){            ?>            <tr style="background: #cad9ea"> <

JSP_实现Servlet登陆，注册，链接Mysql数据库。

本文http://blog.csdn.net/svitter 也是一个MVC的实例 源码:http://download.csdn.net/detail/svitter/7532621 user.sql: -- phpMyAdmin SQL Dump -- version phpStudy 2014 -- http://www.phpmyadmin.net -- -- 主机: localhost -- 生成日期: 2014 年 06 月 21 日 17:42 -- 服务器版本: 5.5.38 -

JDBC链接Mysql数据库+执行sql(mac)

package com.wangbingan.jdbc; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class JdbcUtil { public static void main(String args[]) throws Exception { Connection conn = null; //