三層架構(gòu)之?dāng)?shù)據(jù)庫訪問層(doc6頁)

1、三層架構(gòu)之?dāng)?shù)據(jù)庫訪問層完全篇(C#)2008-07-15 15:11using System;using System.Data;using System.Data.SqlClient;using System.Configuration;namespace DbBasepublic abstract class Base#region Fields of base calssprotected static string strConn = ConfigurationSettings.AppSettingsstrConnection;protected static string strSQ

2、L;#endregion#region Properties of base class#endregion#region Functions of base classpublic Base()/ TODO: Add constructor logic here/ / executing SQL commands/ / string/ return intprotected static int ExecuteSql(string strSQL)SqlConnection myCn = new SqlConnection(strConn);SqlCommand myCmd = new Sql

3、Command(strSQL,myCn);trymyCn.Open();myCmd.ExecuteNonQuery();return 0;catch(System.Data.SqlClient.SqlException e)throw new Exception(e.Message);finallymyCmd.Dispose();myCn.Close();/ /executing SQL commands/ / 要執(zhí)行的 SQL語句 , 為字符串類型 string/ 返回執(zhí)行情況 , 整形 intprotected static int ExecuteSqlEx(string strSQL)S

4、qlConnection myCn = new SqlConnection(strConn); SqlCommand myCmd = new SqlCommand(strSQL,myCn);trymyCn.Open();SqlDataReader myReader = myCmd.ExecuteReader(); if(myReader.Read()return 0;elsethrow new Exception(Value Unavailable!);catch(System.Data.SqlClient.SqlException e)throw new Exception(e.Messag

5、e);finallymyCmd.Dispose();myCn.Close();/ / get dataset/ / (string)/ (DataSet)protected static DataSet ExecuteSql4Ds(string strSQL)SqlConnection myCn = new SqlConnection(strConn); trymyCn.Open();SqlDataAdapter sda = new SqlDataAdapter(strSQL,myCn); DataSet ds = new DataSet(ds); sda.Fill(ds);return ds

6、;catch(System.Data.SqlClient.SqlException e)throw new Exception(e.Message);finallymyCn.Close();/ / get single value/ / (string)/ (int)protected static int ExecuteSql4Value(string strSQL)SqlConnection myCn = new SqlConnection(strConn); SqlCommand myCmd = new SqlCommand(strSQL,myCn); trymyCn.Open();ob

7、ject r = myCmd.ExecuteScalar();if(Object.Equals(r,null)throw new Exception(value unavailable！ );elsereturn (int)r;catch(System.Data.SqlClient.SqlException e)throw new Exception(e.Message);finallymyCmd.Dispose();myCn.Close();/ / get object/ / (string)/ (object)protected static object ExecuteSql4Value

8、Ex(string strSQL)SqlConnection myCn = new SqlConnection(strConn); SqlCommand myCmd = new SqlCommand(strSQL,myCn); trymyCn.Open();object r = myCmd.ExecuteScalar();if(Object.Equals(r,null)throw new Exception(object unavailable!);elsereturn r;catch(System.Data.SqlClient.SqlException e)throw new Excepti

9、on(e.Message);finallymyCmd.Dispose();myCn.Close();/ / execute multipul SQL commands/ / string/ intprotected static int ExecuteSqls(string strSQLs)SqlConnection myCn = new SqlConnection(strConn); SqlCommand myCmd = new SqlCommand();int j=strSQLs.Length;trymyCn.Open();catch(System.Data.SqlClient.SqlEx

10、ception e)throw new Exception(e.Message);SqlTransaction myTrans = myCn.BeginTransaction();trymyCmd.Connection = myCn;myCmd.Transaction = myTrans;foreach(string str in strSQLs)myCmd.CommandText = str;myCmd.ExecuteNonQuery();myTrans.Commit();return 0;catch(System.Data.SqlClient.SqlException e)myTrans.

11、Rollback();throw new Exception(e.Message);finallymyCmd.Dispose();myCn.Close();#endregion人生最大的幸福，莫過于連一分鐘都無法休息零碎的時(shí)間實(shí)在可以成就大事業(yè)珍惜時(shí)間可以使生命變的更有價(jià)值時(shí)間象奔騰澎湃的急湍，它一去無返，毫不流連一個(gè)人越知道時(shí)間的價(jià)值，就越感到失時(shí)的痛苦得到時(shí)間，就是得到一切用經(jīng)濟(jì)學(xué)的眼光來看，時(shí)間就是一種財(cái)富時(shí)間一點(diǎn)一滴凋謝，猶如蠟燭漫漫燃盡我總是感覺到時(shí)間的巨輪在我背后奔馳，日益迫近夜晚給老人帶來平靜，給年輕人帶來希望不浪費(fèi)時(shí)間，每時(shí)每刻都做些有用的事，戒掉一切不必要的行為時(shí)間乃是萬物中最寶貴的東西，但如果浪費(fèi)了，那就是最大的浪費(fèi)我的產(chǎn)業(yè)多么美，多么廣，多么寬，時(shí)間是我的財(cái)產(chǎn)，我的田地是時(shí)間時(shí)間就是性命，無端的空耗別人的時(shí)間，知識(shí)是取之不盡，用之不竭的。只有最大限度地挖掘它，才能體會(huì)到學(xué)習(xí)的樂趣。新想法常常瞬息即逝，必須集中精力，牢記在心，及時(shí)捕獲。每天早晨睜開眼睛，深吸一口氣，給自己一個(gè)微笑，然后說：“在這美妙的一天，我又要獲得多少知識(shí)啊！” 不要為這個(gè)世界而驚嘆，要讓這個(gè)世界為你而驚嘆！如果說學(xué)習(xí)有捷徑可走，那也一定是勤奮。學(xué)習(xí)猶如