今天我们来聊一下网站的三层如何搭建起来的（网站第一版的框架）。参考网站：革西网络
在我刚接触开发的时候，三层是用的最多的框架，没有之一。借助一些代码生成器，我们能够很容易的建立三层来，其中的增删改的方法已经有了，我们只是需要在这些基础之上，根据项目的具体的业务逻辑进行一些代码的编写就能实现了。
首先来看DAL，涵盖了在项目中，我们所需要的大部分的方法。看代码，是这样写的：
1 public class DAL 2 { 3 #region BaseDAL 4 SqlDataPRovider SQLProvider = new SqlDataProvider(SqlHelper.GetConnSting());//TODO:这个动态类是单例模式? 5 /// <summary> 6 /// 得到最大ID 7 /// </summary> 8 /// <param name="table">表名</param> 9 /// <returns></returns> 10 public int GetMaxId(string table) 11 { 12 return SQLProvider.GetMaxID("Id", table); 13 } 14 15 /// <summary> 16 /// 是否存在该记录 17 /// </summary> 18 /// <param name="Table">表名</param> 19 /// <param name="Id">编号Id</param> 20 /// <returns></returns> 21 public bool Exists(string Table, int Id) 22 { 23 StringBuilder strSql = new StringBuilder(); 24 strSql.AppendFormat("select count(1) from {0}", Table); 25 strSql.Append(" where Id=@Id"); 26 SqlParameter[] parameters = { 27 new SqlParameter("@Id", SqlDbType.Int,4) 28 }; 29 parameters[0].Value = Id; 30 31 return SQLProvider.Exists(strSql.ToString(), parameters); 32 } 33 34 /// <summary> 35 /// 增加一条数据 36 /// </summary> 37 /// <param name="Field">要插入的字段</param> 38 /// <param name="Models">插入字段的参数</param> 39 /// <returns></returns> 40 public int Add(string Table, string field, string[] Models) 41 { 42 StringBuilder strSql = new StringBuilder(); 43 strSql.AppendFormat("insert into {0}(", Table); 44 strSql.AppendFormat("{0})", field); 45 strSql.Append(" values ("); 46 strSql.AppendFormat("{0})", SqlParameterHelp.SqlParaValues(field)); 47 strSql.Append(";select @@IDENTITY"); 48 49 object obj = SQLProvider.Execute(strSql.ToString(), SqlParameterHelp.SqlPara(field, Models)); 50 if (obj == null) 51 { 52 return 0; 53 } 54 else 55 { 56 return Convert.ToInt32(obj); 57 } 58 } 59 /// <summary> 60 /// 更新一条数据 61 /// </summary> 62 /// <param name="id">根据id修改</param> 63 /// <param name="table">表名</param> 64 /// <param name="fields">修改字段如Id=@Id</param> 65 /// <returns></returns> 66 public bool Update(string id, string table, string fields, string[] Models) 67 { 68 StringBuilder strSql = new StringBuilder(); 69 strSql.AppendFormat("update {0} set ", table); 70 strSql.AppendFormat("{0}", SqlParameterHelp.SqlParaValuesUpdate(fields)); 71 strSql.AppendFormat(" where Id={0}", id); 72 73 74 int rows = SQLProvider.Execute(strSql.ToString(), SqlParameterHelp.SqlPara(fields, Models)); 75 if (rows > 0) 76 { 77 return true; 78 } 79 else 80 { 81 return false; 82 } 83 } 84 85 public bool Update(string id, string table, string fields, string Models) 86 { 87 StringBuilder strSql = new StringBuilder(); 88 strSql.AppendFormat("update {0} set {1}={2} where Id={3} ", table, fields, Models,id); 89 int rows = SQLProvider.Execute(strSql.ToString()); 90 if (rows > 0) 91 { 92 return true; 93 } 94 else 95 { 96 return false; 97 } 98 } 99 100 /// <summary>101 /// 删除一条数据102 /// </summary>103 /// <param name="Table">表名</param>104 /// <param name="Id">编号</param>105 /// <returns></returns>106 public bool Delete(string Table, int Id)107 {108 109 StringBuilder strSql = new StringBuilder();110 strSql.AppendFormat("delete from {0} ", Table);111 strSql.Append(" where Id=@Id");112 SqlParameter[] parameters = { 113 new SqlParameter("@Id", SqlDbType.Int,4)114 };115 parameters[0].Value = Id;116 117 int rows = SQLProvider.Execute(strSql.ToString(), parameters);118 if (rows > 0)119 {120 return true;121 }122 else123 {124 return false;125 }126 }127 /// <summary>128 /// 批量删除数据129 /// </summary>130 public bool DeleteList(string table, string Idlist)131 {132 StringBuilder strSql = new StringBuilder();133 strSql.AppendFormat("delete from {0} ", table);134 strSql.Append(" where Id in (" + Idlist + ") ");135 int rows = SQLProvider.Execute(strSql.ToString());136 if (rows > 0)137 {138 return true;139 }140 else141 {142 return false;143 }144 }145 146 147 /// <summary>148 /// 得到一个对象实体149 /// </summary>150 /// <typeparam name="T">实体类型</typeparam>151 /// <param name="Table">表名</param>152 /// <param name="Id">Id</param>153 /// <returns></returns>154 public T GetModles<T>(string Table, int Id) where T : new()155 {156 StringBuilder strSql = new StringBuilder();157 strSql.AppendFormat("select top 1 * from {0} ", Table);158 strSql.Append(" where Id=@Id");159 SqlParameter[] parameters = {160 new SqlParameter("@Id", SqlDbType.Int,4)161 };162 parameters[0].Value = Id;163 164 T model = new T();165 DataSet ds = SQLProvider.GetDataset(strSql.ToString(), parameters);166 if (ds.Tables[0].Rows.Count > 0)167 {168 return DataConvert.DataRowToModel<T>(ds.Tables[0].Rows[0]);169 }170 else171 {172 return default(T);173 }174 }175 176 177 178 /// <summary>179 /// sql获得数据列表180 /// </summary>181 /// <param name="strWhere">sql条件</param>182 /// <returns></returns>183 public DataSet GetListBySql(string strWhere, string table)184 {185 return SQLProvider.GetDataset(strWhere.ToString());186 }187 /// <summary>188 /// 获得数据列表189 /// </summary>190 /// <param name="strWhere">sql条件</param>191 /// <returns></returns>192 public DataSet GetList(string strWhere, string table)193 {194 StringBuilder strSql = new StringBuilder();195 strSql.Append("select * ");196 strSql.AppendFormat(" from {0} ", table);197 if (strWhere.Trim() != "")198 {199 strSql.Append(" where " + strWhere);200 }201 return SQLProvider.GetDataset(strSql.ToString());202 }203 204 /// <summary>205 /// 分页得到相应数据206 /// </summary>207 /// <param name="strWhere"></param>208 /// <param name="table"></param>209 /// <param name="strorder"></param>210 /// <param name="start"></param>211 /// <param name="end"></param>212 /// <returns></returns>213 public DataSet GetList(string strWhere, string table, string strorder, int start, int end)214 {215 string sql = "";216 if (strWhere.Trim() != "")217 {218 sql = "select * from(select *,ROW_NUMBER() over(order by " + strorder + " ) as Num from " + table + " where " + strWhere + ") as newTable where Num between " + start + " and " + end + "";219 }220 else221 {222 sql = "select * from(select *,ROW_NUMBER() over(order by " + strorder + " ) as Num from " + table + ") as newTable where Num between " + start + " and " + end + "";223 }224 return SQLProvider.GetDataset(sql.ToString());225 }226 227 /// <summary>228 /// 非常规排序229 /// </summary>230 /// <param name="strTop"></param>231 /// <param name="strWhere"></param>232 /// <param name="table"></param>233 /// <param name="rank"></param>234 /// <returns></returns>235 public DataSet GetTopListOne(string strTop, string strs, string table, string rank)236 {237 StringBuilder strSql = new StringBuilder();238 strSql.Append("select top(" + strTop + ")* ");239 strSql.AppendFormat(" from {0} ", table);240 if (strs.Trim() != "")241 {242 strSql.Append(" " + strs);243 }244 strSql.Append(" order by " + rank + "");245 return SQLProvider.GetDataset(strSql.ToString());246 }247 248 /// <summary>249 /// 获取前几行数据 用于首页显示 方便250 /// </summary>251 /// <typeparam name="T"></typeparam>252 /// <param name="strTop"></param>253 /// <param name="strWhere"></param>254 /// <param name="table"></param>255 /// <returns></returns>256 public DataSet GetTopList(string strTop, string strWhere, string table, string rank)257 {258 StringBuilder strSql = new StringBuilder();259 strSql.Append("select top(" + strTop + ")* ");260 strSql.AppendFormat(" from {0} ", table);261 if (strWhere.Trim() != "")262 {263 strSql.Append(" where " + strWhere);264 }265 strSql.Append(" order by " + rank + "");266 return SQLProvider.GetDataset(strSql.ToString());267 }268 269 270 public DataSet GetTopList2(string strTop, string strWhere, string table, string rank)271 {272 StringBuilder strSql = new StringBuilder();273 strSql.Append("select top(" + strTop + ") id,title,ImgInfo,Author,Time ");274 strSql.AppendFormat(" from {0} ", table);275 if (strWhere.Trim() != "")276 {277 strSql.Append(" where " + strWhere);278 }279 strSql.Append(" order by " + rank + "");280 return SQLProvider.GetDataset(strSql.ToString());281 }282 283 /// <summary>284 /// 获得前几行数据285 /// </summary>286 /// <param name="Top">几行</param>287 /// <param name="strWhere">sql语句</param>288 /// <param name="filedOrder">排序</param>289 /// <param name="table">表名</param>290 /// <returns></returns>291 public DataSet GetList(int Top, string strWhere, string filedOrder, string table)292 {293 StringBuilder strSql = new StringBuilder();294 strSql.Append("select ");295 if (Top > 0)296 {297 strSql.Append(" top " + Top.ToString());298 }299 strSql.Append(" * ");300 strSql.AppendFormat(" from {0} ", table);301 if (strWhere.Trim() != "")302 {303 strSql.Append(" where " + strWhere);304 }305 strSql.Append(" order by " + filedOrder);306 return SQLProvider.GetDataset(strSql.ToString());307 }308 309 /// <summary>310 /// 获取记录总数311 /// </summary>312 /// <param name="strWhere">sql查询条件</param>313 /// <param name="table">表名</param>314 /// <returns></returns>315 public int GetRecordCount(string strWhere, string table)316 {317 StringBuilder strSql = new StringBuilder();318 strSql.AppendFormat("select count(1) from {0} ", table);319 if (strWhere.Trim() != "")320 {321 strSql.Append(" where " + strWhere);322 }323 object obj = SQLProvider.GetScalar(strSql.ToString());324 if (obj == null)325 {326 return 0;327 }328 else329 {330 return Convert.ToInt32(obj);331 }332 }333 /// <summary>334 /// 分页获取数据列表335 /// </summary>336 /// <param name="strWhere">分页条件</param>337 /// <param name="orderby">排序字段desc</param>338 /// <param name="startIndex">开始页</param>339 /// <param name="endIndex">结束页</param>340 /// <param name="table">表名</param>341 /// <returns></returns>342 public DataSet GetListByPage(string strWhere, string orderby, int startIndex, int endIndex, string table)343 {344 StringBuilder strSql = new StringBuilder();345 strSql.Append("SELECT * FROM ( ");346 strSql.Append(" SELECT ROW_NUMBER() OVER (");347 if (!string.IsNullOrEmpty(orderby.Trim()))348 {349 strSql.Append("order by T." + orderby);350 }351 else352 {353 strSql.Append("order by T.Id desc");354 }355 strSql.AppendFormat(")AS Row, T.* from {0} T ", table);356 if (!string.IsNullOrEmpty(strWhere.Trim()))357 {358 strSql.Append(" WHERE " + strWhere);359 }360 strSql.Append(" ) TT");361 strSql.AppendFormat(" WHERE TT.Row between {0} and {1}", startIndex, endIndex);362 return SQLProvider.GetDataset(strSql.ToString());363 }364 365 366 #endregion BasicMethod367 }
再来看看BLL基类：
1 public class BLL 2 { 3 private readonly DAL dal = new DAL(); 4 5 /// <summary> 6 /// 得到最大ID 7 /// </summary> 8 /// <param name="table">表名</param> 9 /// <returns></returns> 10 public int GetMaxId(string table) 11 { 12 return dal.GetMaxId(table); 13 } 14 /// <summary> 15 /// 是否存在该记录 16 /// </summary> 17 /// <param name="Table">表名</param> 18 /// <param name="Id">编号Id</param> 19 /// <returns></returns> 20 public bool Exists(string table, int Id) 21 { 22 return dal.Exists(table, Id); 23 } 24 /// <summary> 25 /// 增加一条数据 26 /// </summary> 27 /// <param name="Field">要插入的字段</param> 28 /// <param name="Models">插入字段的参数</param> 29 /// <returns></returns> 30 public int Add(string Table, string Field, string[] Models) 31 { 32 return dal.Add(Table, Field, Models); 33 } 34 /// <summary> 35 /// 更新一条数据 36 /// </summary> 37 /// <param name="id">根据id修改</param> 38 /// <param name="table">表名</param> 39 /// <param name="fields">修改字段</param> 40 /// <returns></returns> 41 public bool Update(string id, string table, string fields, string[] models) 42 { 43 return dal.Update(id, table, fields, models); 44 } 45 46 public bool Update(string id, string table, string fields, string models) 47 { 48 return dal.Update(id, table, fields, models); 49 } 50 /// <summary> 51 /// 删除一条数据 52 /// </summary> 53 /// <param name="Table">表名</param> 54 /// <param name="Id">编号</param> 55 /// <returns></returns> 56 public bool Delete(string Table, int Id) 57 { 58 return dal.Delete(Table, Id); 59 } 60 /// <summary> 61 /// 获得数据列表 62 /// </summary> 63 /// <param name="strWhere">sql条件</param> 64 /// <returns></returns> 65 public DataSet GetList(string strWhere, string table) 66 { 67 return dal.GetList(strWhere, table); 68 } 69 70 #region 利用泛型类获取实体类 71 /// <summary> 72 /// 获得数据列表 73 /// </summary> 74 public List<T> GetModelList<T>(string strWhere, string table) where T : new() 75 { 76 DataSet ds = dal.GetList(strWhere, table); 77 return DataTableToList<T>(ds.Tables[0]); 78 } 79 80 /// <summary> 81 /// 纯sql获得数据列表 82 /// </summary> 83 public List<T> GetModelListBySql<T>(string sql, string table) where T : new() 84 { 85 DataSet ds = dal.GetListBySql(sql, table); 86 return DataTableToList<T>(ds.Tables[0]); 87 } 88 89 public List<T> GetModelList<T>(string strWhere, string table, string strorder, int start, int end) where T : new() 90 { 91 DataSet ds = dal.GetList(strWhere, table, strorder, start, end); 92 return DataTableToList<T>(ds.Tables[0]); 93 } 94 95 /// <summary> 96 /// 获取前几行数据 用于首页显示 方便 97 /// </summary> 98 /// <typeparam name="T"></typeparam> 99 /// <param name="strTop"></param>100 /// <param name="strWhere"></param>101 /// <param name="table"></param>102 /// <returns></returns>103 public List<T> GetModelTopList<T>(string strTop, string strWhere, string table, string rank) where T : new()104 {105 DataSet ds = dal.GetTopList(strTop, strWhere, table, rank);106 return DataTableToList<T>(ds.Tables[0]);107 }108 109 110 public List<T> GetModelTopList2<T>(string strTop, string strWhere, string table, string rank) where T : new()111 {112 DataSet ds = dal.GetTopList2(strTop, strWhere, table, rank);113 return DataTableToList<T>(ds.Tables[0]);114 }115 116 117 /// <summary>118 /// 根据国家文章的前几篇排序 非常规排序119 /// </summary>120 /// <typeparam name="T"></typeparam>121 /// <param name="strTop"></param>122 /// <param name="strs"></param>123 /// <param name="table"></param>124 /// <param name="rank"></param>125 /// <returns></returns>126 public List<T> GetModelTopListOne<T>(string strTop, string strs, string table, string rank) where T : new()127 {128 DataSet ds = dal.GetTopListOne(strTop, strs, table, rank);129 return DataTableToList<T>(ds.Tables[0]);130 }131 132 /// <summary>133 /// 获得数据列表134 /// </summary>135 public List<T> DataTableToList<T>(DataTable dt) where T : new()136 {137 List<T> modelList = new List<T>();138 int rowsCount = dt.Rows.Count;139 if (rowsCount > 0)140 {141 T model;142 for (int n = 0; n < rowsCount; n++)143 {144 model = DataConvert.DataRowToModel<T>(dt.Rows[n]);145 if (model != null)146 {147 modelList.Add(model);148 }149 }150 }151 return modelList;152 }153 154 155 SqlDataProvider SQLProvider = new SqlDataProvider(SqlHelper.GetConnSting());156 /// <summary>157 /// 得到一个对象实体158 /// </summary>159 /// <typeparam name="T">实体类型</typeparam>160 /// <param name="Table">表名</param>161 /// <param name="Id">Id</param>162 /// <returns></returns>163 public T GetModles<T>(string Table, int Id) where T : new()164 {165 StringBuilder strSql = new StringBuilder();166 strSql.AppendFormat("select top 1 * from {0} ", Table);167 strSql.Append(" where Id=@Id");168 SqlParameter[] parameters = {169 new SqlParameter("@Id", SqlDbType.Int,4)170 };171 parameters[0].Value = Id;172 173 T model = new T();174 DataSet ds = SQLProvider.GetDataset(strSql.ToString(), parameters);175 if (ds.Tables[0].Rows.Count > 0)176 {177 return DataConvert.DataRowToModel<T>(ds.Tables[0].Rows[0]);178 }179 else180 {181 return default(T);182 }183 }184 185 /// <summary>186 /// 得到一个对象实体187 /// </summary>188 /// <typeparam name="T">实体类型</typeparam>189 /// <param name="Table">表名</param>190 /// <param name="Id">Id</param>191 /// <returns></returns>192 public T GetModles<T>(string Table, string fields, string models) where T : new()193 {194 StringBuilder strSql = new StringBuilder();195 strSql.AppendFormat("select top 1 * from {0} ", Table);196 strSql.AppendFormat(" where {0}=@{1}", fields, fields);197 SqlParameter[] parameters = {198 new SqlParameter("@"+fields+"", models)199 };200 201 T model = new T();202 DataSet ds = SQLProvider.GetDataset(strSql.ToString(), parameters);203 if (ds.Tables[0].Rows.Count > 0)204 {205 return DataConvert.DataRowToModel<T>(ds.Tables[0].Rows[0]);206 }207 else208 {209 return default(T);210 }211 }212 213 /// <summary>214 /// 得到一个对象实体 sql215 /// </summary>216 /// <typeparam name="T">实体类型</typeparam>217 /// <param name="Table">表名</param>218 /// <param name="strWhere">Id</param>219 /// <returns></returns>220 public T GetModle<T>(string Table, string strWhere) where T : new()221 {222 StringBuilder strSql = new StringBuilder();223 strSql.AppendFormat("select top 1 * from {0} ", Table);224 if (strWhere.Trim() != "")225 {226 strSql.Append(" where " + strWhere);227 }228 229 T model = new T();230 DataSet ds = SQLProvider.GetDataset(strSql.ToString());231 if (ds.Tables[0].Rows.Count > 0)232 {233 return DataConvert.DataRowToModel<T>(ds.Tables[0].Rows[0]);234 }235 else236 {237 return default(T);238 }239 }240 /// <summary>241 /// 得到一个对象实体242 /// </summary>243 /// <typeparam name="T">实体类型</typeparam>244 /// <param name="Table">表名</param>245 /// <param name="Name">Name</param>246 /// <returns></returns>247 public T GetModles<T>(string Table, string Name) where T : new()248 {249 StringBuilder strSql = new StringBuilder();250 strSql.AppendFormat("select top 1 * from {0} ", Table);251 strSql.Append(" where UserEmail=@Name");252 SqlParameter[] parameters = {253 new SqlParameter("@Name", SqlDbType.NVarChar,50)254 };255 parameters[0].Value = Name;256 257 T model = new T();258 DataSet ds = SQLProvider.GetDataset(strSql.ToString(), parameters);259 if (ds.Tables[0].Rows.Count > 0)260 {261 return DataConvert.DataRowToModel<T>(ds.Tables[0].Rows[0]);262 }263 else264 {265 return default(T);266 }267 }268 #endregion269 270 /// <summary>271 /// 获得数据列表272 /// </summary>273 public DataSet GetAllList(string table)274 {275 return GetList("", table);276 }277 278 /// <summary>279 /// 获得前几行数据280 /// </summary>281 /// <param name="Top">几行</param>282 /// <param name="strWhere">sql语句</param>283 /// <param name="filedOrder">排序</param>284 /// <param name="table">表名</param>285 /// <returns></returns>286 public DataSet GetList(int Top, string strWhere, string filedOrder, string table)287 {288 return dal.GetList(Top, strWhere, filedOrder, table);289 }290 /// <summary>291 /// 获取记录总数292 /// </summary>293 /// <param name="strWhere">sql查询条件</param>294 /// <param name="table">表名</param>295 /// <returns></returns>296 public int GetRecordCount(string strWhere, string table)297 {298 return dal.GetRecordCount(strWhere, table);299 }300 /// <summary>301 /// 分页获取数据列表302 /// </summary>303 /// <param name="strWhere">分页条件</param>304 /// <param name="orderby">排序字段desc</param>305 /// <param name="startIndex">开始页</param>306 /// <param name="endIndex">结束页</param>307 /// <param name="table">表名</param>308 /// <returns></returns>309 public DataSet GetListByPage(string strWhere, string orderby, int startIndex, int endIndex, string table)310 {311 return dal.GetListByPage(strWhere, orderby, startIndex, endIndex, table);312 }313 314 315 /// <summary>316 /// 关键词下拉查询317 /// </summary>318 /// <param name="kw">关键词</param>319 /// <returns></returns>320 public IEnumerable<SearchSum> GetSuggestion(string kw)321 {322 DataTable dt = SQLProvider.ExecuteDataTable(@"select top 5 KeyWords,count(*) as searchcount from SearchDetails 323 where datediff(day,searchdatetime,getdate())<7324 and keywords like @keyword325 group by Keywords order by count(*) desc", new SqlParameter("@keyword", "%" + kw + "%"));326 List<SearchSum> list = new List<SearchSum>();327 if (dt != null && dt.Rows != null && dt.Rows.Count > 0)328 {329 foreach (DataRow row in dt.Rows)330 {331 SearchSum oneModel = new SearchSum();332 oneModel.Keyword = Convert.ToString(row["keywords"]);333 oneModel.SearchCount = Convert.ToInt32(row["SearchCount"]);334 list.Add(oneModel);335 }336 }337 return list;338 }339 #region 热度查询+缓存340 /// <summary>341 /// 缓存342 /// </summary>343 /// <returns></returns>344 public IEnumerable<SearchDetails> GetHotWords()345 {346 //缓存347 var data = HttpRuntime.Cache["hotwords"];348 if (data == null)349 {350 IEnumerable<SearchDetails> hotWords = DoSelect();351 HttpRuntime.Cache.Insert("hotwords", hotWords, null, DateTime.Now.AddMilliseconds(30), TimeSpan.Zero);352 return hotWords;353 }354 return (IEnumerable<SearchDetails>)data;355 }356 /// <summary>357 /// 查询热度358 /// </summary>359 /// <returns></returns>360 private IEnumerable<SearchDetails> DoSelect()361 {362 string sql = @"select top 5 Keywords,count(*) as searchcount from SearchDetails 363 where datediff(day,searchdatetime,getdate())<7364 group by Keywords order by count(*) desc";365 List<SearchDetails> list = new List<SearchDetails>();366 367 list = GetModelListBySql<SearchDetails>(sql, "SearchDetails");368 return list;369 }370 #endregion 371 }
最后看看Model，其中的新闻类：
1 [Serializable] 2 public class NewsInfo 3 { 4 public NewsInfo() 5 { } 6 #region Model 7 private int _id; 8 private string _title; 9 private string _keyword; 10 private string _summary; 11 private string _source; 12 private string _sourceUrl; 13 private string _author; 14 private DateTime _time; 15 private int _hits; 16 private string _newsinfo; 17 private int _ishotspot; 18 private int _newstypeid; 19 private string _newstypename; 20 private int _isdelete; 21 private int _sort; 22 private string _imgInfo; 23 private string _imgDec; 24 private int _price; 25 private int _review; 26 private string _creatUserId; 27 public string CreatUserId 28 { 29 get { return _creatUserId; } 30 set { _creatUserId = value; } 31 } 32 private string checkState; 33 public string CheckState 34 { 35 get { return checkState; } 36 set { checkState = value; } 37 } 38 39 /// <summary> 40 /// 评论 41 /// </summary> 42 public int Review 43 { 44 get { return _review; } 45 set { _review = value; } 46 } 47 48 public int Price 49 { 50 get { return _price; } 51 set { _price = value; } 52 } 53 public string ImgDec 54 { 55 get { return _imgDec; } 56 set { _imgDec = value; } 57 } 58 59 /// <summary> 60 /// 编号 61 /// </summary> 62 public int Id 63 { 64 set { _id = value; } 65 get { return _id; } 66 } 67 68 /// <summary> 69 /// 标题 70 /// </summary> 71 public string Title 72 { 73 set { _title = value; } 74 get { return _title; } 75 } 76 /// <summary> 77 /// 关键字 78 /// </summary> 79 public string KeyWord 80 { 81 set { _keyword = value; } 82 get { return _keyword; } 83 } 84 /// <summary> 85 /// 摘要 86 /// </summary> 87 public string Summary 88 { 89 set { _summary = value; } 90 get { return _summary; } 91 } 92 /// <summary> 93 /// 来源 94 /// </summary> 95 public string Source 96 { 97 set { _source = value; } 98 get { return _source; } 99 }100 /// <summary>101 /// 来源url102 /// </summary>103 public string SourceUrl104 {105 set { _sourceUrl = value; }106 get { return _sourceUrl; }107 }108 /// <summary>109 /// 作者110 /// </summary>111 public string Author112 {113 set { _author = value; }114 get { return _author; }115 }116 /// <summary>117 /// 发表时间118 /// </summary>119 public DateTime Time120 {121 set { _time = value; }122 get { return _time; }123 }124 /// <summary>125 /// 点击量126 /// </summary>127 public int Hits128 {129 set { _hits = value; }130 get { return _hits; }131 }132 133 /// <summary>134 /// 新闻内容135 /// </summary>136 public string Newsinfo137 {138 get { return _newsinfo; }139 set { _newsinfo = value; }140 }141 142 /// <summary>143 /// 是否是热点144 /// </summary>145 public int IsHotSpot146 {147 set { _ishotspot = value; }148 get { return _ishotspot; }149 }150 151 /// <summary>152 /// 新闻类型编号153 /// </summary>154 public int NewsTypeId155 {156 set { _newstypeid = value; }157 get { return _newstypeid; }158 }159 /// <summary>160 /// 新闻类型名称 161 /// </summary>162 public string NewsTypeName163 {164 set { _newstypename = value; }165 get { return _newstypename; }166 }167 168 /// <summary>169 /// 是否删除170 /// </summary>171 public int IsDelete172 {173 set { _isdelete = value; }174 get { return _isdelete; }175 }176 177 /// <summary>178 /// 新闻排序179 /// </summary>180 public int Sort181 {182 set { _sort = value; }183 get { return _sort; }184 }185 186 /// <summary>187 /// 图片路径188 /// </summary>189 public string ImgInfo190 {191 get { return _imgInfo; }192 set { _imgInfo = value; }193 }194 #endregion Model195 }
Model类使用东软的代码生成器生成的。目前为止，我们简单的三层的主要的代码已经出来了。但是怎么能把这些连在一起呢，看代码：
1 public abstract class DataProvider 2 { 3 private static DataProvider _instance = null; 4 public static DataProvider Instance 5 { 6 get 7 { 8 if (_instance == null) 9 {10 String strConnectionString = ConfigurationManager.ConnectionStrings["ConnnectionString"].ConnectionString;11 12 String strConnectionType = ConfigurationManager.ConnectionStrings["ConnectionType"].ConnectionString;13 if (strConnectionType.ToLower() == "sqlclient")14 {15 strConnectionType = "DAL.SqlDataProvider, DAL";16 }17 18 Type t = Type.GetType(strConnectionType);19 Type[] paramTypes = new Type[1];20 paramTypes[0] = typeof(String);21 22 Object[] paramArray = new Object[1];23 paramArray[0] = strConnectionString;24 25 _instance = (DataProvider)((ConstructorInfo)t.GetConstructor(paramTypes)).Invoke(paramArray);26 }27 return _instance;28 }29 }30 31 #region 抽象属性和方法32 33 #region 数据库链接串34 public abstract String ConnectionString { get; }35 #endregion36 37 #region 执行SQL语句38 public virtual bool Exists(string strSql, params SqlParameter[] cmdParms) { return true; }39 public virtual int GetMaxID(string FieldName, string TableName) { return 0; }40 public abstract Object GetScalar(String selectSql);41 public abstract DataSet GetDataset(String selectSql);42 public virtual DataSet GetDatasetTrans(SqlTransaction trans, String selectSql) { return null; }43 public virtual DataSet GetDatasetTrans(OleDbTransaction trans, String selectSql) { return null; }44 public virtual DataSet GetDataset(String selectSql, SqlParameter[] para) { return null; }45 public virtual DataSet GetDataset(String selectSql, OleDbParameter[] para) { return null; }46 public virtual DataSet GetDatasetTrans(SqlTransaction trans, String selectSql, SqlParameter[] para) { return null; }47 public virtual DataSet GetDatasetTrans(OleDbTransaction trans, String selectSql, OleDbParameter[] para) { return null; }48 public abstract int Execute(String noneQuery);49 public virtual int Execute(String noneQuery, SqlParameter[] para) { return 0; }50 public virtual int Execute(String noneQuery, OleDbParameter[] para) { return 0; }51 public abstract IDataReader GetReader(String selectSql);52 public virtual IDataReader GetReaderTrans(SqlTransaction trans, String selectSql) { return null; }53 public virtual IDataReader GetReaderTrans(OleDbTransaction trans, String selectSql) { return null; }54 public virtual IDataReader GetReader(String selectSql, SqlParameter[] para) { return null; }55 public virtual IDataReader GetReader(String selectSql, OleDbParameter[] para) { return null; }56 public virtual IDataReader GetReaderTrans(SqlTransaction trans, String selectSql, SqlParameter[] para) { return null; }57 public virtual IDataReader GetReaderTrans(OleDbTransaction trans, String selectSql, OleDbParameter[] para) { return null; }58 #endregion59 60 #region 执行存储过程61 public abstract void ExecuteSp(String spName);62 public virtual void ExecuteSp(SqlTransaction trans, String spName) { }63 public virtual void ExecuteSp(OleDbTransaction trans, String spName) { }64 public virtual void ExecuteSp(String spName, SqlParameter[] para) { }65 public virtual void ExecuteSp(String spName, OleDbParameter[] para) { }66 public virtual void ExecuteSp(SqlTransaction trans, String spName, SqlParameter[] para) { }67 public virtual void ExecuteSp(OleDbTransaction trans, String spName, OleDbParameter[] para) { }68 public abstract IDataReader GetReaderBySp(String spName);69 public virtual IDataReader GetReaderBySp(String spName, SqlParameter[] para) { return null; }70 public virtual IDataReader GetReaderBySp(String spName, OleDbParameter[] para) { return null; }71 public abstract Object GetScalarBySp(String spName);72 public virtual Object GetScalarBySp(String spName, SqlParameter[] para) { return null; }73 public virtual Object GetScalarBySp(String spName, OleDbParameter[] para) { return null; }74 public abstract DataSet GetDatasetBySp(String spName);75 public virtual DataSet GetDatasetBySp(String spName, SqlParameter[] para) { return null; }76 public virtual DataSet GetDatasetBySp(String spName, OleDbParameter[] para) { return null; }77 #endregion78 79 #endregion80 }
另外记得在Web.config文件中，修改数据库的链接地址哟。
到目前为止，三层的东西已经都全了。再接下来，咱们一块看看，到底是如何利用三层进行数据的增删改查的。
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