Question

我有这个代码来更新实体

 public async Task<User> UpdateAsync(User entity)
 {
      var userDb = await _context.User.Include(x => x.UserApplications).ThenInclude(xx =>
      xx.Application).Include(x => x.State).Include(x => x.UserProfiles).ThenInclude(x => 
      x.Profile).FirstOrDefaultAsync(x => x.UserName == entity.UserName && x.SecretKey == 
      entity.SecretKey && x.Email == entity.Email);


    userDb.FirstName = entity.FirstName;
    userDb.LastName = entity.LastName;
    userDb.State = await _context.State.FirstAsync(x => x.StateId == entity.State.StateId);

    userDb.UserProfiles.Clear();
    userDb.UserApplications.Clear();
    userDb.UserProfiles.AddRange(entity.UserProfiles); //ManyToMany
    userDb.UserApplications.AddRange(entity.UserApplications); //Many To Many
    _context.User.Update(userDb);
    await _context.SaveChangesAsync();
    return userDb;
}

生成sql

执行DbCommand（8ms）[参数= [@ p0 =＆＃39;？＆＃39;，@ p1 =＆＃39;？＆＃39;，@ p14 =＆＃39;？＆＃39; ，@ p2 =＆＃39;？＆＃39;，@ p3 =＆＃39;？＆＃39;，@ p4 =＆＃39;？＆＃39;，@ p5 =＆＃39;？＆＃ 39;，@ p6 =＆＃39;？＆＃39;，@ p7 =＆＃39;？＆＃39;，@ p8 =＆＃39;？＆＃39;，@ p9 =＆＃39;？＆＃39;，@ p10 =＆＃39;？＆＃39;，@ p11 =＆＃39;？＆＃39;，@ p12 =＆＃39;？＆＃39;，@ p13 =＆＃39 ;？＆＃39;，@ p15 =＆＃39;？＆＃39;，@ p16 =＆＃39;？＆＃39;，@ p17 =＆＃39;？＆＃39;，@ p18 =＆＃39;？＆＃39;，@ p19 =＆＃39;？＆＃39;，@ p20 =＆＃39;？＆＃39;，@ p21 =＆＃39;？＆＃39;]，CommandType =＆＃39;文字＆＃39;，CommandTimeout =＆＃39; 30＆＃39;]插入＆＃34;应用程序＆＃34; （＆＃34; ApplicationId＆＃34;，＆＃34; ApplicationName＆＃34;）VALUES（@ p0，@ p1）;更新＆＃34;用户＆＃34; SET＆＃34; ApiKeyId＆＃34; = @ p2，＆＃34;评论＆＃34; = @ p3，＆＃34; CreationDate＆＃34; = @ p4，＆＃34;电子邮件＆＃34; = @ p5，＆＃34; FirstName＆＃34; = @ p6，＆＃34; IsOnLine＆＃34; = @ p7，＆＃34; LastLoginDate＆＃34; = @ p8，＆＃34;姓氏＆＃34; = @ p9，＆＃34;密码＆＃34; = @ p10，＆＃34; SecretKey＆＃34; = @ p11，＆＃34; StateId＆＃34; = @ p12，＆＃34;用户名＆＃34; = @ p13 WHERE＆＃34; UserId＆＃34;与@ p14不相同; DELETE FROM＆＃34; UserApplication＆＃34;在哪里＆＃34; UserApplicationId＆＃34;与@ p15不相同;删除＆＃34; UserProfile＆＃34;在哪里＆＃34; UserProfileId＆＃34;从@ p16开始并不是很明显;删除＆＃34; UserProfile＆＃34;在哪里＆＃34; UserProfileId＆＃34;与@ p17不同; INSERT INTO＆＃34; UserProfile＆＃34; （＆＃34; ProfileId＆＃34;，＆＃34; UserId＆＃34;）VALUES（@ p18，@ p19）RETURNING＆＃34; UserProfileId＆＃34 ;; INSERT INTO＆＃34; UserProfile＆＃34; （＆＃34; ProfileId＆＃34;，＆＃34; UserId＆＃34;）VALUES（@ p20，@ p21）RETURNING＆＃34; UserProfileId＆＃34 ;;

为什么EF插入新实体

  ( INSERT INTO "Application" ("ApplicationId", "ApplicationName")
  VALUES (@p0, @p1)) if only i need update the user?

EF Core版本：1 RC2
操作系统：Mac OSX

此致

用户类

public sealed class User
{
    public int UserId { get; set; }
    public string SecretKey { get; set; }
    public ApiKey Apikey { get; set; }
    public string UserName { get; set; }
    public string Email { get; set; }
    public string Comment { get; set; }
    public string Password { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime LastLoginDate { get; set; } = DateTime.Now;
    public DateTime CreationDate { get; set; } = DateTime.Now;
    public bool IsOnLine { get; set; } = false;
    public State State { get; set; } = new State();
    public List<UserProfile> UserProfiles { get; set; } = new List<UserProfile>();
    public List<UserApplication> UserApplications { get; set; } = new List<UserApplication>();


}

UserApplication Class

 public class UserApplication
{
    public int UserApplicationId { get; set; }
    public int UserId { get; set; }
    public User User { get; set; }
    public int ApplicationId { get; set; }
    public Application Application { get; set; }
}

Answer 1

致电时

    userDb.UserApplications.Clear();

你清除每个UserApplication，这可能是Application的主体。级联删除正在删除Application，因此EF知道必须重新插入它。

Answer 2

我很久以前就遇到过这种情况。

在我的情况下，插入正在发生，因为我添加的对象具有主键（Id）= 0.因此EF总是被理解为新行。

可能是一种可能性。

实体框架核心更新多对多对象

2 个答案: