CJCMS系列--持久层对MangoDB的支持

　　持久层添加对MangoDB数据库的支持

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using CJCMS.Data;
using MongoDB.Bson;
using MongoDB.Driver;
using MongoDB.Driver.Builders;
using MongoDB.Driver.GridFS;
using MongoDB.Driver.Linq;
using System.Linq.Expressions;

namespace CJCMS.Data
{
    public class MangoDBRepository<T> : IRepository<T> where T : IEntity
    {

        MongoCollection<T> _session = null;

        public MangoDBRepository()
        {
            //读配置
            string connectionString = "mongodb://localhost";

            MongoClient client = new MongoClient(connectionString);

            var server = client.GetServer();

            //读配置
            var database = server.GetDatabase("test");

            //获取T的名称
            _session = database.GetCollection<T>("tableName");
        }

        public void Add(T entity)
        {
            _session.Insert(entity);
        }

        public IQueryable<T> Table { get { return _session.AsQueryable<T>(); } }

        public void Update(T entity)
        {
            _session.Save(entity);
        }

        public void Save(T entity)
        {
            _session.Save(entity);
        }

        public void Delete(T entity)
        {
            var query = Query<T>.EQ(e => e.Id, entity.Id);
            _session.Remove(query);
        }

        public void Delete(string id)
        {
            var query = Query<T>.EQ(e => e.Id, id);
            _session.Remove(query);
        }

        public T GetByKey(string id)
        {
            var query = Query<T>.EQ(e => e.Id, id);
            T t = _session.FindOneAs<T>(query);
            return t;
        }

        public int Count(Expression<Func<T, bool>> predicate)
        {
            return Table.Count(predicate);
        }

        private IQueryable<T> FetchQuery(Expression<Func<T, bool>> predicate)
        {
            return Table.Where(predicate);
        }

        private IQueryable<T> FetchQuery(Expression<Func<T, bool>> predicate, Action<Orderable<T>> order, out string OrderName)
        {
            var orderable = new Orderable<T>(FetchQuery(predicate));
            order(orderable);
            OrderName = orderable.OrderName;
            return orderable.Queryable;
        }

        public IList<T> Fetch(Expression<Func<T, bool>> predicate)
        {
            object t = null;

            if (t == null)
            {
                t = FetchQuery(predicate).ToList();
                return (IList<T>)t;
            }
            else
            {
                return (IList<T>)t;
            }
        }

        public IList<T> Fetch(Expression<Func<T, bool>> predicate, Action<Orderable<T>> order)
        {
            object t = null;
            string key = string.Empty;
            IQueryable<T> q = FetchQuery(predicate, order, out key);
            if (t == null)
            {
                t = q.ToList();
                return (IList<T>)t;
            }
            else
            {
                q = null;
                return (IList<T>)t;
            }
        }

        public IList<T> Fetch(Expression<Func<T, bool>> predicate, Action<Orderable<T>> order, int index, int count)
        {
            object t = null;
            string key = string.Empty;
            IQueryable<T> q = FetchQuery(predicate, order, out key);

            if (t == null)
            {
                t = q.Skip(index * count).Take(count).ToList();

                return (IList<T>)t;
            }
            else
            {
                q = null;
                return (IList<T>)t;
            }
        }

        public void Persist()
        { 

        }
    }
}