数据操作层，泛型基接口的设计

using System;
using System.Linq;
using System.Linq.Expressions;

namespace Tking.OA.IDAL
{
/// <summary>
/// 数据驱动层的抽象，泛型基接口设计。数据持久层的实现技术，可以是：Dapper、Ado.Net、EntityFramework、NHibernate...
/// </summary>
/// <typeparam name="T">实体</typeparam>
public interface IBaseDAO<T> where T : class,new()
{
/// <summary>
/// 添加数据
/// </summary>
T Add(T m);

/// <summary>
/// 删除数据
/// </summary>
bool Delete(dynamic id);

/// <summary>
/// 更新数据
/// </summary>
bool Update(T m);

/// <summary>
/// 根据主键获取一条数据
/// </summary>
T GetById(dynamic id);

/// <summary>
/// 根据条件获取数据
/// </summary>
/// <param name="whereLambda">查询表达式</param>
IQueryable<T> GetList(Expression<Func<T, bool>> whereLambda);

/// <summary>
/// 根据条件获取分页数据列表
/// </summary>
/// <typeparam name="S">排序的关键字，由实体属性决定</typeparam>
/// <param name="pageSize">页显示记录数</param>
/// <param name="pageIndex">页码</param>
/// <param name="total">总数据条数</param>
/// <param name="whereLambda">查询表达式</param>
/// <param name="orderByLambda">排序表达式</param>
/// <param name="isAsc">是否降序获取</param>
IQueryable<T> GetListByPage<S>(int pageIndex, int pageSize, out int total,
Expression<Func<T, bool>> whereLambda,
Expression<Func<T, S>> orderByLambda, bool isAsc);
/// <summary>
/// 用于控制数据的批量提交
/// </summary>
int SaveChanges();
}
}