Generate Data Access Layer with t4 template

Question

I am looking for some help or pointers explaining a bit more on generating the whole Data Access Layer with a T4 Template. For example all the INSERT etc. statements and C# methods implementing it.

Answer 1

You should not do that, try the Generic Repository pattern instead, you will end up with a single interface with a single implementation using Generics which can be used for any type in your model.

public interface IRepository<T, K> where T : class
    {
        T Add(T item);
        bool Update(T item);
        bool DeleteById(K id);
    }

Implementation

 public class EFRepository<T, K> : IRepository<T, K>, IDisposable where T : class
    {
        protected readonly DbContext _dbContext;
        private readonly DbSet<T> _entitySet;

        public EFRepository(DbContext context)
        {
            _dbContext = context;
            _entitySet = _dbContext.Set<T>();
        }

        public T Add(T item)
        {
            item = _entitySet.Add(item);
            _dbContext.SaveChanges();
            return item;
        }

        public bool Update(T item)
        {
            _entitySet.Attach(item);
            _dbContext.Entry(item).State = EntityState.Modified;
            _dbContext.SaveChanges();
            return true;
        }

        public bool DeleteById(K id)
        {
            var item = _entitySet.Find(id);
            _entitySet.Remove(item);
            _dbContext.SaveChanges();
            return true;
        }
}