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[ASP.net教程]C#连接常用数据库的DBProviderName配置


    为了适应应对各种数据库间切换,我们有时想要要自定义写一个通用的SqlHelper。常用的做法就是在 System.Data.Common.DbProviderFactories.GetFactory(dbProviderName).CreateConnection() ,来返回对应的 数据库的Connection 。

          直接上测试源码:

      string dbProviderName = "System.Data.Odbc";      dbProviderName = "System.Data.OleDb";      dbProviderName = "System.Data.SqlClient";      dbProviderName = "System.Data.OracleClient";      //引用 System.Data.SQLite.dll      dbProviderName = "System.Data.SQLite";      //引用 MySql.Data.dll      dbProviderName = "MySql.Data.MySqlClient";      //引用 Oracle.ManagedDataAccess.dll      dbProviderName = "Oracle.ManagedDataAccess.Client";      DbProviderFactory dbfactory = DbProviderFactories.GetFactory(dbProviderName);      DbConnection dbconn = dbfactory.CreateConnection();      dbconn.ConnectionString = string.Empty;// 数据库连接字符串

     需要注意的 config 配置:

<??><configuration> <startup useLegacyV2RuntimeActivationPolicy="true">  <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>  <supportedRuntime version="v2.0.50727"/> </startup><system.data>  <DbProviderFactories>   <remove invariant="System.Data.SQLite"/>   <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" />      <remove invariant="MySql.Data.MySqlClient"/>   <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data" />      <remove invariant="Oracle.ManagedDataAccess.Client"/>   <add name="Oracle Data Provider" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess" />       </DbProviderFactories>  </system.data></configuration>

 

    最后附上 代码。