由一个DAOHelper类引发的思考

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Practices.Unity;
using Sable.Dao;
using Blrs.Wcp.Models;
using PetaPoco;

namespace Blrs.Wcp.Services
{
    /// <summary>
    /// 外部数据源管理对象管理接口的实现类
    /// </summary>
    /// <remarks>
    ///     <img src="ClassDiagram.png" />
    /// </remarks>
    public class CmsDataSourceService : ICmsDataSourceService
    {
        ICmsComplexDatumService cmsComplexDatumService = new CmsComplexDatumService();

        public Page Show()
        {
            return this.ShowDataSource("");
        }

        public Page ShowDataSource(string TypeId)
        {
            CmsDataSourceQueryData cmsDataSourceQueryData = new CmsDataSourceQueryData();
            cmsDataSourceQueryData.Page = new Page();
            cmsDataSourceQueryData.TypeId = TypeId;
            return Query(cmsDataSourceQueryData);
        }

        public Page Query(CmsDataSourceQueryData cmsDataSourceQueryData)
        {
            Sql sql = new Sql("select a.* from Cms_DataSource a");
            string where = " a.DateSoureTitle like @0 ";
            if (cmsDataSourceQueryData.TypeId != "" && cmsDataSourceQueryData.TypeId != null)
            {
                where += " and a.DateSoureMethod <>‘2‘ ";
            }
            sql.Where(where, new object[] { "%" + cmsDataSourceQueryData.DateSoureTitle + "%" });
            sql.OrderBy(new object[] { "a.DateSoureTitle" });
            DaoHelper.QueryByPage<CmsDataSource>(sql, cmsDataSourceQueryData.Page);
            return cmsDataSourceQueryData.Page;
        }

        public void Add(CmsDataSourceList cmsDataSource)
        {
            string names = DaoHelper.ExecuteScalar<string>("select a.DateSoureTitle from Cms_DataSource a where a.DateSoureTitle = @0 ", new object[] { "" + cmsDataSource.CmsDataSource.DateSoureTitle + "" });
            if (names != null)
            {
                throw new Exception("不允许数据源名称相同！");
            }
            cmsDataSource.CmsDataSource.ID = Guid.NewGuid().ToString();
            DaoHelper.Insert(cmsDataSource.CmsDataSource);
            cmsComplexDatumService.AddOrUpdate(cmsDataSource);
        }

        public void Update(CmsDataSourceList cmsDataSource)
        {
            string names = DaoHelper.ExecuteScalar<string>("select a.DateSoureTitle from Cms_DataSource a where a.DateSoureTitle = @0 and a.ID<> ‘"+cmsDataSource.CmsDataSource.ID+"‘", new object[] { "" + cmsDataSource.CmsDataSource.DateSoureTitle + "" });
            if (names != null)
            {
                throw new Exception("不允许数据源名称相同！");
            }
            DaoHelper.Update(cmsDataSource.CmsDataSource);
            cmsComplexDatumService.AddOrUpdate(cmsDataSource);
        }

        public void Del(string id)
        {
            List<string> ids = new List<string>();
            ids.Add(id);
            this.Dels(ids);
        }

        public void Dels(List<string> ids)
        {
            foreach (string id in ids)
            {
                DaoHelper.Delete<CmsComplexDatum>(new Sql("delete from Cms_ComplexData where NID=‘" + id + "‘"));
                DaoHelper.Delete<CmsDataSource>((object)id);
            }
        }

        public CmsDataSourceList Show(string id)
        {
            CmsDataSourceList list = new CmsDataSourceList();
            CmsDataSource cmsDataSource = DaoHelper.SingleOrDefault<CmsDataSource>((object)id);
            IEnumerable<CmsComplexDatum> cmsComplexDatums = DaoHelper.Query<CmsComplexDatum>("select a.*,b.DateSoureTitle from Cms_ComplexData a,Cms_DataSource b where a.CID=@0 and a.NID=b.ID ", new string[] { id });
            list.CmsDataSource = cmsDataSource;
            list.CmsComplexDatums = cmsComplexDatums.ToList<CmsComplexDatum>();
            return list;
        }
    }
}