.Net数据操作案例

Interface

using System.Collections.Generic;
using Ddd.Core.Domain.Customers;
namespace Ddd.Services.Customers
{
    /// <summary>
    /// Contact service
    /// </summary>
    public partial interface IContactService
    {
        /// <summary>
        /// Gets all Contacts
        /// </summary>
        /// <returns>Contact</returns>
        IList<Contact> GetAllContacts();

        /// <summary>
        /// Gets a Contact
        /// </summary>
        /// <param name="contactId">Contact identifier</param>
        /// <returns>Contact</returns>
        Contact GetContactById(int contactId);

        /// <summary>
        /// Inserts a Contact
        /// </summary>
        /// <param name="contact">Contact</param>
        void InsertContact(Contact contact);

        /// <summary>
        /// Updates the Contact
        /// </summary>
        /// <param name="contact">Contact</param>
        void UpdateContact(Contact contact);

        /// <summary>
        /// Deletes a Contact
        /// </summary>
        /// <param name="Contact">Contact</param>
        void DeleteContact(Contact contact);

        /// <summary>
        /// Deletes a Contact
        /// </summary>
        /// <param name="SelfId">SelfId</param>
        /// <param name="FriendId">FriendId</param>
        void DeleteContact(int SelfId,int FriendId);

        List<Contact> GetContactsByCustomerId(int customerId, bool includeBlack = true);
        Contact GetContactByCustomerIds(int sourceId, int targetId);
        bool CheckFriends(int sourceId, int targetId);
    }
}

Interface实现

using System;
using System.Collections.Generic;
using System.Linq;
using Ddd.Core.Caching;
using Ddd.Core.Data;
using Ddd.Core.Domain.Customers;
using Ddd.Services.Events;

namespace Ddd.Services.Customers
{
    /// <summary>
    /// Contact service
    /// </summary>
    public partial class ContactService : IContactService
    {
        #region Constants

        /// <summary>
        /// Key for caching
        /// </summary>
        private const string CONTACTS_ALL_KEY = "YY.contact.all";
        /// <summary>
        /// Key for caching
        /// </summary>
        /// <remarks>
        /// {0} : contact ID
        /// </remarks>
        private const string CONTACT_BY_ID_KEY = "YY.contact.id-{0}";
        /// <summary>
        /// Key pattern to clear cache
        /// </summary>
        private const string CONTACTS_PATTERN_KEY = "YY.contact.";
        #endregion

        #region Fields
        private readonly IRepository<Contact> _contactRepository;
        private readonly IEventPublisher _eventPublisher;
        private readonly ICacheManager _cacheManager;
        #endregion

        #region Ctor

        /// <summary>
        /// Ctor
        /// </summary>
        /// <param name="cacheManager">Cache manager</param>
        /// <param name="contactRepository">Contact repository</param>
        /// <param name="eventPublisher">Event published</param>
        public ContactService(ICacheManager cacheManager,
            IRepository<Contact> contactRepository,
            IEventPublisher eventPublisher)
        {
            this._cacheManager = cacheManager;
            this._contactRepository = contactRepository;
            this._eventPublisher = eventPublisher;
        }

        #endregion

        #region Methods

        /// <summary>
        /// Gets all Contacts
        /// </summary>
        /// <returns>Contacts</returns>
        public virtual IList<Contact> GetAllContacts()
        {
            string key = CONTACTS_ALL_KEY;
            return _cacheManager.Get(key, () =>
            {
                var query = from a in _contactRepository.Table
                            orderby a.Id
                            select a;
                return query.ToList();
            });
        }

        /// <summary>
        /// Gets a Contact
        /// </summary>
        /// <param name="contactId">Contact identifier</param>
        /// <returns>Contact</returns>
        public virtual Contact GetContactById(int contactId)
        {
            if (contactId == 0)
                return null;

            string key = string.Format(CONTACT_BY_ID_KEY, contactId);
            return _cacheManager.Get(key, () => _contactRepository.GetById(contactId));
        }

        /// <summary>
        /// Inserts a Contact
        /// </summary>
        /// <param name="contact">Contact</param>
        public virtual void InsertContact(Contact contact)
        {
            if (contact == null)
                throw new ArgumentNullException("contact");

            _contactRepository.Insert(contact);

            _cacheManager.RemoveByPattern(CONTACTS_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityInserted(contact);
        }

        /// <summary>
        /// Updates the Contact
        /// </summary>
        /// <param name="contact">Contact</param>
        public virtual void UpdateContact(Contact contact)
        {
            if (contact == null)
                throw new ArgumentNullException("contact");

            _contactRepository.Update(contact);

            _cacheManager.RemoveByPattern(CONTACTS_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityUpdated(contact);
        }

        /// <summary>
        /// Deletes a Contact
        /// </summary>
        /// <param name="contact">Contact</param>
        public virtual void DeleteContact(Contact contact)
        {
            if (contact == null)
                throw new ArgumentNullException("contact");

            _contactRepository.Delete(contact);

            _cacheManager.RemoveByPattern(CONTACTS_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityDeleted(contact);
        }

        /// <summary>
        /// Deletes a Contact
        /// </summary>
        /// <param name="SelfId">SelfId</param>
        /// <param name="FriendId">FriendId</param>
        public virtual void DeleteContact(int SelfId,int FriendId)
        {
            Contact contact = GetContactByCustomerIds(SelfId, FriendId);
            DeleteContact(contact);
        }

        public Contact GetContactByCustomerIds(int sourceId, int targetId)
        {
            var query = from c in _contactRepository.Table
                        where c.SelfId == sourceId
                        && c.FriendId == targetId
                        select c;
            return query.FirstOrDefault();
        }

        public List<Contact> GetContactsByCustomerId(int customerId,bool includeBlack=true)
        {
            var query = from c in _contactRepository.Table
                        where c.SelfId == customerId
                        &&(includeBlack||!c.IsBlack)
                        select c;
            return query.ToList();
        }

        public virtual bool CheckFriends(int sourceId,int targetId)
        {
            return _contactRepository.Table.Any(c => c.SelfId == sourceId && c.FriendId == targetId);
        }
        #endregion
    }
}

调用

private readonly IContactService _contactService;
public ActionResult delFriends(int SelfId,int FriendId)
{
     _contactService.DeleteContact(SelfId, FriendId);
     return Json(new { result = true, info = "", msg = "操作成功" });
}

小结:也很清晰，很简单。