repository-pattern

问题 I have couple of questions about Repository pattern: If I'm using only offline database for example Room with LiveData is there any use of Repository pattern? If my app is offline right now, but will be connected to remote db in the future should I implement repository pattern or it's not going to be a problem to do it later? 回答1: To begin with, Repository pattern have nothing to do with technology or programming language. Repository pattern is useful to separate persistence concerns from

问题 let's take two example. Example 1 ( Repository pattern ) Interface interface FooInterface { public function all(); } Model (Using it in a loose term) class FooModel implements FooInterface { public function all() { return DB::('sometable')->get(); } } Service Provider class FooServiceProvider extends ServiceProvider { public function register() { $this->app->bind( 'Foo\FooInterface', 'Foo\FooModel' ); } config/app.php 'providers' => array( // -- 'Foo\FooServiceProvider' ), And at last the

问题 I am new to repository pattern, and I come up the following questions: What is/are the purpose of repository pattern? What is/are the limitation of repository pattern? What is/are the benefits of repository pattern? Do the methods below should be exposed in the repository pattern? public IQueryable<T> GetQuery(){ return _objectSet; } public IEnumerable<T> GetAll(){ return GetQuery().AsEnumerable(); } public IEnumerable<T> Find(Expression<Func<T, bool>> predicate){ return _objectSet.Where

问题 I am using the repository pattern found in the answer to this SO question: Advantage of creating a generic repository vs. specific repository for each object? Namely, each repository inherits from an abstract base class that contains generic methods like add, delete, etc. and also implements a specific repository interface for any methods that are unique to that repository/entity. ie. public class CompanyRepository : Repository<Company>, ICompanyRepository { ... } In my business layer I am

问题 I have a visual studio solution using solid pattern. I have a IRepository (Crud implementation), IDbFactory (used by a repository), IUnitOfWork. I also have services, who uses repositories to build custom querys and complex database operation. I am using also IoC pattern with Ninject. In a web mvc controller I use only services to access to database. A repository receive a IDbFactory who build a EntityFramework Context. I have some problems: In a service when i have to access to two tables

问题 How does one turn on the required Spring / JPA / Hibernate behaviours to invoke @PrePersist and @PreUpdate hooks? Our stack includes those three and a Repository for each entity, but we feel it is better to model this as a resposibility of the entity itself with the help of these hooks, but they are not called. Each Repository has an EntityManager injected. I am using those EntityManagers, not Sessions. The EntityManager is created by a org.springframework.orm.jpa

问题 I am trying to implement pagination and sorting with generic repository. How to take primary key column as default order by column in DbSet ? DbSet = Context.Set<T>(); public IQueryable<T> GetAll(int pageNumber = 0, int pageSize = 10, string sortColumn = "") { return DbSet.OrderBy("how to use primary key column here").Skip(pageNumber * pageSize)Take(pageSize); } 回答1: I have used these extension methods to achieve something similar: public static string GetKeyField(Type type) { var

问题 Since Asp.net 2.0, there is the Provider Model. On the implementation detail, a provider is class derived from ProviderBase which is an abstract class rather than an interface, but anyway the Provider Model is there so that we can have different implementation to swap in the out by just editing the web.config. For example if you create a blog app, you may have a BlogProvider : ProviderBase, then you can have implementations of BlogProvider like: SqlBlogProvider, OracleBlogProvider and even

问题 I'm new to git and would want to know if this branching approach would be okay for what we intended to do. We'll have three sites prod.websitename.com - live site sandbox.websitename.com - testing site that can be used by our clients dev.websitename.com - internal site for developing and testing hotfix/features before pushing to live site What we intend to do is to have a single centralized repository that would serve all three sites. The repository will have three branches: master, sandbox,

问题 In my asp.net mvc 3 application, I'm using the repository pattern. I have 3 entities, Company, Country, City. Each of them has their own repository. Company entity has FoundedCountry and FoundedCity foreign keys. Now in a view, I want to show the company details. In this view I want to view Company details as well as, FoundedCountry name and FoundedCity name. In my opinion I have to handle this with a kind of JOIN query. But I'm stuck at how to achieve this in repository pattern. How can I