.NET框架自帶的數據提供器包括SQLServer(System.Data.SqlClient)、Oracle??? (System.Data.Oracleclient)、OLEDB(System.Data.Oledb)、ODBC (System.Data.Odbc)

ADO.NET2.0提出了全新的System.Data.Common命名空間。使WEB開發與后臺數據庫無關的數據訪問代碼，讓WEB程序在運行的時候決定使用上述哪個提供器，所以性能上無影響。

1：通常的做法是在Web.Config配置中添加連接字符串。如下

<connectionStrings>

<add name="ConnectionString"

connectionString="server=(local)"SQLEXPRESS;database=Dataname;uid=username;pwd=password" providerName="System.Data.SqlClient"/>

</connectionStrings>--這里使用SQL數據提供器

2：這里將添加靜態類WebConfiguration.cs 完成對連接字符串和數據提供器的讀取

public static class WebConfiguration

{

//使用readonly的好處是可以在構造器中動態設置字段的值

??? private readonly static string dbConnectionString;

??? private readonly static string dbProviderName;

?static WebConfiguration()

?????? {

???? ???? //將連接字符串賦值給只讀字段dbConnectionString;

???? dbConnectionString= ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

?????? //將數據提供器賦值給自讀字段dbProviderName

???? dbProviderName= ConfigurationManager.ConnectionStrings["ConnectionString"].ProviderName;

?????? }

??? public static string DbConnectionString

??? {

??????? //獲取連接字符串

??????? get { return dbConnectionString;}

??? }

??? public static string DbProviderName

??? {

??????? //供應器的類型

??????? get { return dbProviderName; }

??? }

?}

3:創建通用數據訪問類GenericDataAccess.cs

Code
??1?using?System;
??2?using?System.Data;
??3?using?System.Data.Common;
??4?using?System.Configuration;
??5?using?System.Web;
??6?using?System.Web.Security;
??7?using?System.Web.UI;
??8?using?System.Web.UI.WebControls;
??9?using?System.Web.UI.WebControls.WebParts;
?10?using?System.Web.UI.HtmlControls;
?11?
?12?///?<summary>
?13?///?通用數據庫訪問代碼
?14?///?</summary>
?15?public?static?class?GenericDataAccess
?16?{
?17?????static?GenericDataAccess()
?18?????{
?19?
?20?????}
?21?????///?<summary>
?22?????///?創建DbCommand對象
?23?????///?</summary>
?24?????///?<returns></returns>
?25?????public?static?DbCommand?CreateCommand()
?26?????{
?27?????????string?dataProviderName?=?WebConfiguration.DbProviderName;
?28?????????string?connectionString?=?WebConfiguration.DbConnectionString;
?29?
?30?????????//開發與數據庫無關的代碼
?31?????????DbProviderFactory?factory?=?DbProviderFactories.GetFactory(dataProviderName);
?32?????????DbConnection?conn?=?factory.CreateConnection();
?33?????????conn.ConnectionString?=?connectionString;
?34?????????DbCommand?comm?=?conn.CreateCommand();
?35?????????comm.CommandType?=?CommandType.StoredProcedure;
?36?????????return?comm;
?37?????}
?38???///?<summary>
?39???///?執行查詢，返回datatable
?40???///?</summary>
?41???///?<param?name="command"></param>
?42???///?<returns></returns>
?43?????public?static?DataTable?ExecuteSelectCommand(DbCommand?command)
?44?????{
?45?????????DataTable?table;
?46?????????try
?47?????????{
?48?????????????command.Connection.Open();
?49?????????????DbDataReader?reader?=?command.ExecuteReader();
?50?????????????table?=?new?DataTable();
?51?????????????table.Load(reader);
?52?????????????reader.Close();
?53?????????}
?54?????????catch?(Exception?ex)
?55?????????{
?56?????????????throw?new?Exception(ex.Message,?ex);
?57?????????}
?58?????????finally
?59?????????{
?60?????????????command.Connection.Close();
?61?????????}
?62?????????return?table;
?63??????????????
?64?????}
?65????///?<summary>
?66????///?執行update?insert?del操作
?67????///?</summary>
?68????///?<param?name="command"></param>
?69????///?<returns>返回影響行數</returns>
?70?????public?static?int?ExecuteNonQuery(DbCommand?command)
?71?????{
?72?????????int?affectRows?=?-1;
?73?????????try
?74?????????{
?75?????????????command.Connection.Open();
?76?????????????affectRows?=?command.ExecuteNonQuery();
?77?????????}
?78?????????catch?(Exception?ex)
?79?????????{
?80?????????????throw?new?Exception(ex.Message,?ex);
?81?????????}
?82?????????finally
?83?????????{
?84?????????????command.Connection.Close();
?85?????????}
?86?????????return?affectRows;
?87?????}
?88?????///?<summary>
?89?????///?返回第一列第一行
?90?????///?</summary>
?91?????///?<param?name="command"></param>
?92?????///?<returns></returns>
?93?????public?static?string?ExecuteScalar(DbCommand?command)
?94?????{
?95?????????string?value?=?"";
?96?????????try
?97?????????{
?98?????????????command.Connection.Open();
?99?????????????value?=?command.ExecuteScalar().ToString();?
100?????????????
101?????????}
102?????????catch?(Exception?ex)
103?????????{
104?????????????throw?new?Exception(ex.Message,?ex);
105?????????}
106?????????finally
107?????????{
108?????????????command.Connection.Close();
109?????????}
110?????????return?value;
111?????}
112???
113?}
114?

?好的習慣是將SQL語句寫在存儲過程中。這個類摘自ASP.NET2.0電子商務開發實戰一書。

?這個類能夠滿足基本的數據訪問。

?

轉載于:https://www.cnblogs.com/freegarden/archive/2009/09/25/1574044.html

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