using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DALFactory;
using IDAL;

namespace BLL
{
public abstract class BaseService<T> where T : class,new()
{
public IDBSession CurrentDBSession
{
get
{
// return new DBSession();//暂时
return DBSessionFactory.CreateDBSession();
}
}
public IDAL.IBaseDal<T> CurrentDal { get; set; }
public abstract void SetCurrentDal();
public BaseService()
{
SetCurrentDal();//子类一定要实现抽象方法。
}
public IQueryable<T> LoadEntities(System.Linq.Expressions.Expression<Func<T, bool>> whereLambda)
{

return CurrentDal.LoadEntities(whereLambda);
}

public IQueryable<T> LoadPageEntities<s>(int pageIndex, int pageSize, out int totalCount, System.Linq.Expressions.Expression<Func<T, bool>> whereLambda, System.Linq.Expressions.Expression<Func<T, s>> orderbyLambda, bool isAsc)
{
return CurrentDal.LoadPageEntities<s>(pageIndex, pageSize, out totalCount, whereLambda, orderbyLambda, isAsc);
}
/// <summary>
/// 删除
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool DeleteEntity(T entity)
{
CurrentDal.DeleteEntity(entity);
return CurrentDBSession.SaveChanges();
}
/// <summary>
/// 更新
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool EditEntity(T entity)
{
CurrentDal.EditEntity(entity);
return CurrentDBSession.SaveChanges();
}
/// <summary>
/// 添加数据
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public T AddEntity(T entity)
{
CurrentDal.AddEntity(entity);
CurrentDBSession.SaveChanges();
return entity;
}
}
}

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