MVC5_学习笔记_1_CodeFirst

2023-07-29 13:27:22

MVC5_EF6_1

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Code First--准备工作

Code First 是先建Model再生成数据库以及表

首先创建一个类取名为UserInfo,一个类对应一个数据库的一张表

public class UserInfo

{

    public int ID { get; set; }

    public string Name { get; set; }

    public int Age { get; set; }

}

新建一个文件夹取名为DAL,创建一个数据上下文CodeFirstDBContext

public class CodeFirstDBContext : DbContext

{

    public RuanGongContext()

        : base("CodeFirstDB")

            {

            }

    public DbSet<UserInfo> UserInfos { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)

{

            modelBuilder.Conventions.Remove&lt;PluralizingTableNameConvention&gt;();//是以s结尾,如UserInfos,这段代码是去掉s 以UserInfo这种形式命名表名

}

}

此处继承了DbContextt, "public RuanGongContext(): base("CodeFirstDB")" 这段代码使得该数据上下文与连接串为CodeFirstDB的数据连接串相联系,即RuanGongContext对应连接串为CodeFirstDB的数据库

接下来需要设置Web.config中的数据连接串了

<connectionStrings>

    <add name="CodeFirstDB" connectionString="Persist Security Info=False;User ID=sa;Password=123;Initial Catalog=RuanGongDB;Data Source=127.0.0.1\SQLEXPRESS"

        providerName="System.Data.SqlClient" />

</connectionStrings>

此时编译一下在数据库中就会创建对应的UserInfo表,为了方便可向数据库中加入初始数据

通过种子Seed初始化数据,在DAL中新建一个CodeFirstDBInitializer类,加入代码

public class CodeFirstDBInitializer : System.Data.Entity.DropCreateDatabaseIfModelChanges<CodeFirstDBContext>

{

    protected override void Seed(CodeFirstDBContext context)

    {

        var UserInfos = new List<UserInfo>

        {

            new UserInfo{Name="Alexander",Age=21)},

            new UserInfo{Name="Kate",Age=23)},

            new UserInfo{Name="Bob",Age=20)},

            new UserInfo{Name="Tom",Age=24)},

        };
    UserInfos.ForEach(s =&gt; context.UserInfo.Add(s));

    context.SaveChanges();

}

}

在网站运行之前需要初始化数据,则需要在Web.config中加入以下代码

<entityFramework>

    <contexts>

      <context type="ContosoUniversity.DAL.CodeFirstDBContext, CodeFirstDB">

        <databaseInitializer type="ContosoUniversity.DAL.CodeFirstDBContextInitializer, CodeFirstDB" />

      </context>

    </contexts>

  </entityFramework>

这里有两行代码,context中的type是对应的类名和程序集名,第二行是初始化数据的类名和程序名
作为一种在web.config中设置初始值设定项的替代方法，可以通过在Global.asax.cs中Application_Start方法中增加Database.SetInitializer语句来实现同样的功能。

码农公寓

Code First--准备工作

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