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  • Code First开发方式

    Code First又称代码优先,EF提供类型结构生成SQL并创建数据库中的表

    student类

    public class student:DbContext 注:DbContext表示一个工作单元和存储库的组合模式,可以用来从数据库查询和组一起变化。
    {
    public student()
    {
    Database.SetInitializer(new MigrateDatabaseToLatestVersion<student, DbConfiguration>()); 注:初始化自动迁移
    }
    public DbSet<message> message { get; set; } 注:默认生成的表的类型为复数形式
    }
    public class DbConfiguration : DbMigrationsConfiguration<student>
    {
    public DbConfiguration()
    {
    AutomaticMigrationsEnabled = true; 注:开启自动迁移
    AutomaticMigrationDataLossAllowed = true; 注:迁移的时候是否允许数据丢失
    }
    }

    message类

    public class message
    {
    public int messageID 注:当类名加ID时自动设为主键
    {
    get;
    set;
    }
    public string stuName
    {
    get;
    set;
    }
    public string stuSex
    {
    get;
    set;
    }
    public int stuAge
    {
    get;
    set;
    }
    public long stuPhone
    {
    get;
    set;
    }
    }

    调用 注:如果你写完不调用就不会创建数据库

    student stu = new student();    

    public ActionResult Index()
    {
    if (stu.message.Count() == 0) 注:当stu.message.Count()的数据等于零的时候就向stu.message添加数据
    {
    stu.message.Add(new message() { stuAge = 10, stuName = "张三", stuSex = "男", stuPhone = 12345678912 });
    stu.message.Add(new message() { stuAge = 11, stuName = "李四", stuSex = "女", stuPhone = 12145128912 });
    stu.message.Add(new message() { stuAge = 12, stuName = "王五", stuSex = "女", stuPhone = 12345742912 });
    stu.message.Add(new message() { stuAge = 13, stuName = "赵六", stuSex = "男", stuPhone = 12445678912 });
    stu.SaveChanges();
    }

    }

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  • 原文地址:https://www.cnblogs.com/zhang1999/p/7456443.html
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