recommandbusiness.cs

本系统是基于三层架构和Ajax控件结合的酒店预订系统

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Reflection;
using DBaoBookingManagement.DataAccess;
using DBaoBookingManagement.Entity;

namespace DBaoBookingManagement.BusinessLogic
{
    public class RecommandBusiness:Business
    {
        private RecommendAccessor ra = new RecommendAccessor();

        private static RecommandBusiness instance = null;
        private RecommandBusiness() { }//私有构造函数

        /// <summary>
        /// 获取RecommendBusiness对象
        /// </summary>
        /// <returns></returns>
        public static RecommandBusiness GetInstance()
        {
            if (instance == null)
            {
                instance = new RecommandBusiness();
            }
            return instance;
        }
        /// <summary>
        /// 查询所有推荐人
        /// </summary>
        /// <returns></returns>
        public Recommend[] QueryAll()
        {
            Recommend[] entityList = null;
            try
            {
                DataTable dt = ra.QueryAll();
                entityList = FillEntityList(entityList, dt);
                return entityList;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 根据ID查询推荐人
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public Recommend QueryById(int id)
        {
            Recommend entity = null;
            try
            {
                DataTable dt = ra.QueryById(id);
                if (dt.Rows.Count > 0)
                {
                    entity = new Recommend();
                    PropertyInfo[] props = typeof(Recommend).GetProperties();
                    for (int j = 0; j < props.Length; j++)
                    {
                        string columnName = props[j].Name;
                        object value = dt.Rows[0][columnName];
                        props[j].SetValue(entity, value, null);
                    }
                }
                return entity;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 根据ID删除推荐人
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public bool DeleteById(int id)
        {
            try
            {
                return ra.DeleteById(id);
            }
            catch (Exception ex)
            {
                throw new Exception("根据ID删除推荐人时出现错误：" + ex.Message);
            }
        }

        /// <summary>
        /// 插入推荐人
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        public bool Insert(string recName)
        {
            Recommend entity=new Recommend();
            entity.RecName=recName;
            try
            {
                return ra.Insert(entity);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 修改推荐人
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        public bool Update(int id,string recName)
        {
            Recommend entity = new Recommend();
            entity.RecId=id;
            entity.RecName=recName;
            try
            {
                return ra.Update(entity);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        //填充实体类列表
        private Recommend[] FillEntityList(Recommend[] entityList, DataTable dt)
        {
            if (dt.Rows.Count > 0)
            {
                entityList = new Recommend[dt.Rows.Count];

                //用反射给实体类赋值
                for (int i = 0; i < entityList.Length; i++)
                {
                    Recommend entity = new Recommend();
                    PropertyInfo[] props = typeof(Recommend).GetProperties();
                    for (int j = 0; j < props.Length; j++)
                    {
                        string columnName = props[j].Name;
                        object value = dt.Rows[i][columnName];
                        props[j].SetValue(entity, value, null);
                    }
                    entityList[i] = entity;
                }
            }
            return entityList;
        }
    }
}