使用存儲庫模式獲取上次插入的行ID

Question

我對這個存儲庫模式不熟悉。存儲庫中有以下方法。

public abstract class Repository<T> : IRepository<T> where T : class 
    { 
     private PHOnlineEntities dataContext; 
     private readonly IDbSet<T> dbset; 

     protected Repository(IDatabaseFactory databaseFactory) 
     { 
      DatabaseFactory = databaseFactory; 
      dbset = DataContext.Set<T>(); 
     } 

     protected IDatabaseFactory DatabaseFactory 
     { 
      get; 
      private set; 
     } 

     protected PHOnlineEntities DataContext 
     { 
      get { return dataContext ?? (dataContext = DatabaseFactory.Get()); } 
     } 

     public virtual int Add(T entity) 
     { 
      dbset.Add(entity); 
      dataContext.SaveChanges(); 

      // return id here 
     } 

     public virtual void Update(T entity) 
     { 
      dbset.Attach(entity); 
      dataContext.Entry(entity).State = EntityState.Modified; 
     } 


     public virtual void Delete(T entity) 
     { 
      dbset.Remove(entity); 
     } 

     public virtual void Delete(Expression<Func<T, bool>> where) 
     { 
      IEnumerable<T> objects = dbset.Where<T>(where).AsEnumerable(); 
      foreach (T obj in objects) 
       dbset.Remove(obj); 
     } 

     public virtual T GetById(long id) 
     { 
      return dbset.Find(id); 
     } 

     public virtual T GetById(string id) 
     { 
      return dbset.Find(id); 
     } 

     public virtual IEnumerable<T> GetAll() 
     { 
      return dbset.ToList(); 
     } 

     public virtual IEnumerable<T> GetMany(Expression<Func<T, bool>> where) 
     { 
      return dbset.Where(where).ToList(); 
     } 

     public T Get(Expression<Func<T, bool>> where) 
     { 
      return dbset.Where(where).FirstOrDefault<T>(); 
     } 

這是我CustomerRepository類

public interface ICustomerDetailRepository : IRepository<CustomerDetail> 
    { 
    } 

    /// <summary> 
    /// CustomerDetail repository 
    /// </summary> 
    public class CustomerDetailRepository : Repository<CustomerDetail>, ICustomerDetailRepository 
    { 
     /// <summary> 
     /// 
     /// </summary> 
     private PHOnlineEntities _dataContext; 

     /// <summary> 
     /// 
     /// </summary> 
     protected IDatabaseFactory DatabaseFactory 
     { 
      get; 
      private set; 
     } 

     /// <summary> 
     /// 
     /// </summary> 
     /// <param name="databaseFactory"></param> 
     public CustomerDetailRepository(IDatabaseFactory databaseFactory) 
      : base(databaseFactory) 
     { 
      DatabaseFactory = databaseFactory; 
     } 

     /// <summary> 
     /// 
     /// </summary> 
     protected PHOnlineEntities DataContext 
     { 
      get { return _dataContext ?? (_dataContext = DatabaseFactory.Get()); } 
     } 
    } 

爲CustomerDetail類包含模型。它具有所有實體列和ID列。

當我添加實體到數據庫，我想返回最後插入的行ID。 Id是標識列。任何人都可以幫助我嗎？

Answer 1

檢查插入後，您爲CustomerDetail對象，該ID將已填充

public class CustomerDetail 
{ 
    public int Id{ get; set; } 
    public string Name{ get; set; } 
    public string Address{ get; set; } 
} 
var customerDetail = new CustomerDetail { Name = "Bubbles", Address = "1 way, city" } 
customerDetailRepository.Add(customerDetail) 

Console.WriteLine(customerDetail.Id); // This is the identity value 

Answer 2

你必須創建這樣一個接口：

public interface IEntity 
{ 
    public int Id { get; set;} 
} 

讓你的實體實現該接口，並改變你的倉儲類：

public abstract class Repository<T> : IRepository<T> where T : class, IEntity 
{ 

    (...) 

    public virtual int Add(T entity) 
    { 
     dbset.Add(entity); 
     dataContext.SaveChanges(); 

     // return id here 
     return entity.Id; 
    } 

}