库和工作单位 - 这是负责什么？ [英] Repositories and Units of Work - which is responsible for what?

问题描述

在过去一周左右，我一直在阅读大量的文章和教程有关存储库的模式。很多物品的存储库模式紧密地结合到工作模式的单位。在这些文章中，我通常会发现类似这样的代码：

Over the past week or so I have been reading a lot of articles and tutorials regarding the repository pattern. A lot of the articles closely tie the repository pattern to the unit of work pattern. In these articles, I usually find code similar to this:

interface IUnitOfWork<TEntity>
{
    void RegisterNew(TEntity entity);
    void RegisterDirty(TEntity entity);
    void RegisterDeleted(TEntity entity);

    void Commit();
    void Rollback();
}

interface IRepository<TKey, TEntity>
{
    TEntity FindById(TKey id);
    IEnumerable<TEntity> FindAll();

    void Add(TEntity entity);
    void Update(TEntity entity);
    void Delete(TEntity entity);
}

class Repository : IRepository<int, string>
{
    public Repository(IUnitOfWork<string> context)
    {
        this.context = context;
    }

    private IUnitOfWork<string> context;

    public void Add(string entity)
    {
        context.RegisterNew(entity);
    }

    public void Update(string entity)
    {
        context.RegisterDirty(entity);
    }

    public void Delete(string entity)
    {
        context.RegisterDeleted(entity);
    }

    /* Entity retrieval methods */
}

我是否理解正确的工作目标的单位是为了处理另外，更新或任何对象的缺失底层数据存储（在我的情况，目录服务，我通过LDAP与沟通）？如果这是真的，不应该就处理任何对象的检索呢？这是为什么不建议UOW界面的一部分？

Am I understanding correctly that the unit of work object is meant to handle the addition, update, or deletion of any object in the underlying data store (in my case, a directory service which I communicate with via LDAP)? If that's true, shouldn't it handle the retrieval of any objects as well? Why is that not part of the suggested UoW interface?

推荐答案

A 库负责数据 - 得到它，更新和其他CRUD操作，提供了持久性的无知。

A Repository is in charge of the data - getting it, updating and the other CRUD operations, providing persistence ignorance.

A 组的工作（UOW），因为马林福勒说：

A Unit Of Work (uow), as Marin Fowler says:

保持受业务交易对象的列表，并协调书写出的变化和并发问题的解决。

Maintains a list of objects affected by a business transaction and coordinates the writing out of changes and the resolution of concurrency problems.

该UOW将协调在对象上的多个操作 - 它可能会或可能不会以保存这些变化使用库

The uow will coordinate multiple operations on objects - it may or may not use repositories in order to persist these changes.

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