EFCORE基本使用

 用 nuget 引用相關包

nuget 搜索 entityframeworkcore 安裝標記的這兩個

 

1.創建個類，對應數據庫表

    /// <summary>
    /// 賬號表
    /// </summary>
    public class Sys_Account
    {
        /// <summary>
        /// 主鍵
        /// </summary>
        public int Id { get; set; } 

        /// <summary>
        /// 賬號
        /// </summary>
        public string Account { get; set; }

        /// <summary>
        /// 密碼
        /// </summary>
        public string Password { get; set; }

        /// <summary>
        /// 手機號
        /// </summary>
        public string Phone { get; set; }

        /// <summary>
        /// 頭像
        /// </summary>
        public string Image { get; set; }

        /// <summary>
        /// 角色
        /// </summary>
        public ICollection<Sys_Role>  Sys_Role { get; set; } 

        /// <summary>
        /// 創建時間
        /// </summary>
        public DateTime CareateTime { get; set; }
 
        public virtual Sys_Shop Sys_Shops { get; set; }


    }

 

先弄個DbContext 看看怎么用的

2. 創建連接 DbContextOptionsBuilder配置上下文

1 DbContextOptionsBuilder dob = new DbContextOptionsBuilder(); 2 dob.UseSqlServer("Data Source=.;Initial Catalog=Mang.Core.Db;Persist Security Info=True;User ID=sa;Password=password01!");

 

3. 創建DbContext

            DbContext db = new DbContext(dob.Options);
          
            db.Set<Sys_Account>().Add(new Sys_Account());
            db.Set<Sys_Account>().Remove(new Sys_Account());
            db.Set<Sys_Account>().Where(m => m.Id > 0);
            db.Set<Sys_Account>().Find(100);
            db.Set<Sys_Account>().Find("100");
            db.Set<Sys_Account>().Any(m => m.Id > 0);
            db.Set<Sys_Account>().RemoveRange(new Sys_Account(), new Sys_Account());
  
            db.Entry<Sys_Account>(new Sys_Account()).State = Microsoft.EntityFrameworkCore.EntityState.Added;
            db.Entry<Sys_Account>(new Sys_Account()).State = Microsoft.EntityFrameworkCore.EntityState.Modified;
            db.Entry<Sys_Account>(new Sys_Account()).State = Microsoft.EntityFrameworkCore.EntityState.Detached;
            db.Entry<Sys_Account>(new Sys_Account()).State = Microsoft.EntityFrameworkCore.EntityState.Unchanged;
            db.Entry<Sys_Account>(new Sys_Account()).State = Microsoft.EntityFrameworkCore.EntityState.Deleted;
            db.Entry<Sys_Account>(new Sys_Account()).State = Microsoft.EntityFrameworkCore.EntityState.Unchanged;

 

然后我們繼承DbContext，使用構造函數傳遞DbContextOptionsBuilder配置上下文

 

    /// <summary>
    /// 框架上下文
    /// </summary>
    public class MangCoreContext : DbContext
    {

        public MangCoreContext(DbContextOptions<MangCoreContext> options)
     : base(options)
        {
        }
  
        public DbSet<Sys_Shop> Sys_Shops { get; set; } 
        public DbSet<Sys_Account>  Sys_Accounts { get; set; }
        public DbSet<Sys_Role> Sys_Roles { get; set; }
    }

 

 

 然后 配置注入

 

 

 

 配置數據庫連接

 

下面開始調用

    public class HomeController : Controller
    {
        public MangCoreContext _MangCoreContext { get; set; }

        public HomeController(MangCoreContext MangCoreContext)
        {
            _MangCoreContext = MangCoreContext;

        }

        public IActionResult Index()
        {
            _MangCoreContext.Sys_Accounts.Add(new DbModels.MangCore.MangCoreModels.Sys_Account()
            {
                Account = "admin",
                CareateTime = DateTime.Now,
                Image = "//",
                Password = "123456",
                Phone = "18600912000"
            });
            _MangCoreContext.SaveChanges();
            var accounts = _MangCoreContext.Sys_Accounts.Where(m => true).Select(m => new { Sys_Roles = m.Sys_Role.ToList() }).ToList();
             
            return View();
        }
    }

 

基本使用方法就這些，下一篇講延遲加載

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