搭建自己的框架WedeNet(二)

 WedeNet2018.Infrastructure-基础设施层:
结构如下:

Tools结构如下:

考虑到系统可能会有多个数据上下文(暂时以两个为例),所以根据需要定义两个T4模板用来生成对应的entities和dbcontext类,每个T4模板对应一个数据库连接,这些数据库连接配置在应用层的配置文件中(如UI层web.config或者WCF寄宿层的app.config)。

生成的结果如下:

在此,我把UnitOfWork和Repository都看做为组件,和它们所依赖的dbcontext都统一放在了Components目录下。
仓储需要包装不同的EF entitiy,自然需要定义为泛型接口,如下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace WedeNet2018.Infrastructure.Components
{
    public interface IRepository<T> 
        where T : class
    {
        IQueryable<T> All();
        IQueryable<T> Filter(Expression<Func<T, bool>> predicate);
        T Find(params object[] keys);
        T Find(Expression<Func<T, bool>> predicate);
        void Insert(T t);
        void Insert(IEnumerable<T> entities);
        void Delete(T t);
        void Delete(IEnumerable<T> entities);
        void Update(T t);
        void Update(IEnumerable<T> entities);
        void Clear();
    }
}

接口的实现如下:

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace WedeNet2018.Infrastructure.Components
{
    public class EntityRepository<TContext,TEntity> : IRepository<TEntity>
        where TContext : DbContext
        where TEntity : class
    {
        protected TContext context;
        protected DbSet<TEntity> dbSet;

        public EntityRepository(TContext dbContext)
        {
            context = dbContext;
            dbSet = context.Set<TEntity>();
        }

        protected virtual TContext Context { get { return context; } }
        protected virtual DbSet<TEntity> DbSet { get { return dbSet; } }
        /// <summary>
        /// 查询全部当前实体数据集
        /// </summary>
        /// <returns>IQueryable集合</returns>
        public virtual IQueryable<TEntity> All()
        {
            return DbSet.AsQueryable();
        }
        /// <summary>
        /// 条件查询当前实体数据集
        /// </summary>
        /// <param name="predicate">查询条件</param>
        /// <returns>IQueryable集合</returns>
        public virtual IQueryable<TEntity> Filter(Expression<Func<TEntity, bool>> predicate)
        {
            return DbSet.Where(predicate).AsQueryable<TEntity>();
        }

        /// <summary>
        /// 查找指定主键的数据
        /// </summary>
        /// <param name="keys">指定主键</param>
        /// <returns>符合编号的记录,不存在返回null </returns>
        public virtual TEntity Find(params object[] keys)
        {
            return DbSet.Find(keys);
           
        }

        /// <summary>
        /// 查找指定条件的单条数据
        /// </summary>
        /// <param name="predicate">查询条件</param>
        /// <returns>返回符合条件的数据,或者null</returns>
        public virtual TEntity Find(Expression<Func<TEntity, bool>> predicate)
        {
            return DbSet.FirstOrDefault(predicate);
        }
        /// <summary>
        /// 上下文中插入单个实体
        /// </summary>
        /// <param name="entity"></param>
        public virtual void Insert(TEntity entity)
        {
            if (Context.Entry(entity).State == EntityState.Detached)
            {
                Context.Entry(entity).State = EntityState.Added;
                //DbSet.Add(entity);
            }
        }
        /// <summary>
        /// 上下文中批量插入实体
        /// </summary>
        /// <param name="entities"></param>
        public virtual void Insert(IEnumerable<TEntity> entities)
        {
            try
            {
                Context.Configuration.AutoDetectChangesEnabled = false;
                foreach (TEntity entity in entities)
                {
                    Insert(entity);
                }
            }
            finally
            {
                Context.Configuration.AutoDetectChangesEnabled = true;
            }
        }

        /// <summary>
        /// 上下文中删除单个实体
        /// </summary>
        /// <param name="entity"></param>
        public virtual void Delete(TEntity entity)
        {
            if (Context.Entry(entity).State == EntityState.Detached)
            {
                DbSet.Attach(entity);
            }
            DbSet.Remove(entity);
        }
        /// <summary>
        /// 上下文中批量删除实体
        /// </summary>
        /// <param name="entities"></param>
        public virtual void Delete(IEnumerable<TEntity> entities)
        {
            try
            {
                Context.Configuration.AutoDetectChangesEnabled = false;
                foreach (TEntity entity in entities)
                {
                    Delete(entity);
                }
            }
            finally
            {
                Context.Configuration.AutoDetectChangesEnabled = true;
            }
        }
        /// <summary>
        /// 上下文中更新单个实体
        /// </summary>
        /// <param name="entity"></param>
        public virtual void Update(TEntity entity)
        {
            if (Context.Entry(entity).State == EntityState.Detached)
            {
                DbSet.Attach(entity);
            }
            Context.Entry(entity).State = EntityState.Modified;
        }
        /// <summary>
        /// 上下文中批量更新实体
        /// </summary>
        /// <param name="entities"></param>
        public virtual void Update(IEnumerable<TEntity> entities)
        {
            try
            {
                Context.Configuration.AutoDetectChangesEnabled = false;
                foreach (TEntity entity in entities)
                {
                    Update(entity);
                }
            }
            finally
            {
                Context.Configuration.AutoDetectChangesEnabled = true;
            }
        }

        public virtual void Clear()
        {

        }
    }
}

在这个仓储基类里,引入了该仓储依赖的dbcontext,这个dbcontext会在系统初始化该仓储的时候传入,并且是单例的。这样才能保证UnitOfWork操作的一致性。
另外,针对不同的dbcontext,我也定义了对应的抽象类,如:

目的是在做IOC的时候一个具体类型必须对应一个基类,而在这两个抽象类内部都继承了DbContext,如:

// <auto-generated>
//     此代码由工具生成。
//     对此文件的更改可能会导致不正确的行为,并且如果
//     重新生成代码,这些更改将会丢失。
//	   如存在本生成代码外的新需求,请在相同命名空间下创建同名分部类进行实现。
// </auto-generated>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Data.Entity;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;

namespace WedeNet2018.Infrastructure
{
	public abstract class AbsWedeDBContex:DbContext
	{
		//连接字符串名称:基于Config文件中连接字符串的配置
		const string connectionStringName = "constring";

		public AbsWedeDBContex()
			: base(connectionStringName)
		{ 
			
		}
	}
}

接下来就是UnitOfWork,接口定义如下:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace WedeNet2018.Infrastructure.Components
{
    /// <summary>
    /// 定义工作单元统一接口
    /// </summary>
    public interface IUnitOfWorks
    {
        IQueryable<T> Where<T>(Expression<Func<T, bool>> predicate) where T : class;
        IQueryable<T> All<T>() where T : class;

        T Find<T>(object id) where T : class;
        T Find<T>(Expression<Func<T, bool>> predicate) where T : class;

        void Add<T>(T t) where T : class;
        void Add<T>(IEnumerable<T> items) where T : class;

        void Update<T>(T t) where T : class;
        void Update<T>(IEnumerable<T> items) where T : class;

        void Delete<T>(T t) where T : class;
        void Delete<T>(IEnumerable<T> items) where T : class;

        void Clear<T>() where T : class;
        bool IsCommitted { get; }

        int Commit();
    }
}

和上面定义了两个dbcontext抽象基类一样,出于IOC考虑,这里也定义了两个实现了IUnitOfWorks接口的接口,如:

下面是对应的实现类,如:

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Data.SqlClient;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
using WedeNet2018.Common;

namespace WedeNet2018.Infrastructure.Components
{
    /// <summary>
    /// 实现一个工作单元,将使用NInject注册为单例
    /// </summary>
    /// <typeparam name="TDBContext">该工作单元使用的数据上下文类型</typeparam>
    public class XF0816UnitOfWorks<TDBContext> : IXF0816UnitOfWorks, IDisposable
        where TDBContext : DbContext
    {
        protected TDBContext dbContext;

        public XF0816UnitOfWorks(TDBContext context)
        {
            dbContext = context;
        }

        //构造通用的Repository
        private IDictionary<Type, object> repositoryTable = new Dictionary<Type, object>();

        //注册其它的Repository
        public void Register<T>(IRepository<T> repository) where T : class
        {
            var key = typeof(T);
            if (!repositoryTable.ContainsKey(key))
                repositoryTable.Add(key, repository);
        }


        private IRepository<T> GetRepository<T>()
            where T : class
        {
            IRepository<T> repository = null;
            var key = typeof(T);

            if (repositoryTable.ContainsKey(key))
                repository = (IRepository<T>)repositoryTable[key];
            else
            {
                repository = GenericRepository<T>();
                repositoryTable.Add(key, repository);
            }

            return repository;
        }

        protected virtual IRepository<T> GenericRepository<T>() where T : class
        {
            return new EntityRepository<TDBContext, T>(dbContext);
        }
        /// <summary>
        /// 条件查询当前实体数据集
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="predicate">查询条件</param>
        /// <returns>IQueryable集合</returns>
        public System.Linq.IQueryable<T> Where<T>(Expression<Func<T, bool>> predicate)
           where T : class
        {
            return GetRepository<T>().Filter(predicate);
        }
        /// <summary>
        /// 查询全部当前实体数据集
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <returns>IQueryable集合</returns>
        public System.Linq.IQueryable<T> All<T>() where T : class
        {
            return GetRepository<T>().All();
        }

        /// <summary>
        /// 查找指定主键的数据
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="id">实体主键</param>
        /// <returns>符合编号的记录,不存在返回null</returns>
        public T Find<T>(object id) where T : class
        {
            return GetRepository<T>().Find(id);
        }
        /// <summary>
        /// 查找指定条件的单条数据
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="predicate">查询条件</param>
        /// <returns>返回符合条件的数据,或者null</returns>
        public T Find<T>(Expression<Func<T, bool>> predicate) where T : class
        {
            return GetRepository<T>().Find(predicate);
        }
        /// <summary>
        /// 上下文中插入单个实体
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="t">实体</param>
        public void Add<T>(T t) where T : class
        {
            GetRepository<T>().Insert(t);
        }
        /// <summary>
        /// 上下文中批量插入实体
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="items">实体集合</param>
        public void Add<T>(IEnumerable<T> items) where T : class
        {
            GetRepository<T>().Insert(items);
        }
        /// <summary>
        /// 上下文中更新单个实体
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="t">实体</param>
        public void Update<T>(T t) where T : class
        {
            GetRepository<T>().Update(t);
        }
        /// <summary>
        /// 上下文中批量更新实体
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="items">实体集合</param>
        public void Update<T>(IEnumerable<T> items) where T : class
        {
            GetRepository<T>().Update(items);
        }
        /// <summary>
        /// 上下文中删除单个实体
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="t">实体</param>
        public void Delete<T>(T t) where T : class
        {
            GetRepository<T>().Delete(t);
        }
        /// <summary>
        /// 上下文中批量删除实体
        /// </summary>
        /// <typeparam name="T">实体类型</typeparam>
        /// <param name="items">实体集合</param>
        public void Delete<T>(IEnumerable<T> items) where T : class
        {
            GetRepository<T>().Delete(items);
        }

        public void Clear<T>() where T : class
        {
            GetRepository<T>().Clear();
        }

        /// <summary>
        /// 当前单元操作是否已被提交
        /// </summary>
        public bool IsCommitted { get; private set; }

        /// <summary>
        /// 提交当前工作单元
        /// </summary>
        /// <returns></returns>
        public int Commit()
        {
            try
            {
                int result = dbContext.SaveChanges();
                return result;
            }
            catch (DbUpdateException e)
            {
                if (e.InnerException != null && e.InnerException.InnerException is SqlException)
                {
                    SqlException sqlEx = e.InnerException.InnerException as SqlException;
                    string msg = SqlDataHelper.GetSqlExceptionMessage(sqlEx.Number);
                    throw PublicHelper.ThrowDataAccessException("提交数据更新时发生异常:" + msg, sqlEx);
                }
                throw;
            }
        }


        public void Dispose()
        {
            if (dbContext != null)
            {
                dbContext.Dispose();
            }
            GC.SuppressFinalize(this);
        }


    }
}

到此为止,Infrastructure-基础设施层已经构建好了。

原文地址:https://www.cnblogs.com/zhaow/p/9399434.html