项目涉及到多个数据库的查询更新操作，也就必然需要分布式事务的支持，查了MSDN知道 .net 2.0 中利用新增的 System.Transactions 命名空间可以简单的实现分布式事务：
System.Transactions 基础结构通过支持在 SQL Server、ADO.NET、MSMQ 和 Microsoft 分布式事务协调器 (MSDTC) 中启动的事务，使事务编程在整个平台上变得简单和高效。它提供基于 Transaction 类的显式编程模型，还提供使用 TransactionScope 类的隐式编程模型，在这种模型中事务是由基础结构自动管理的。强烈建议使用更为方便的隐式模型进行开发。参考MSDN的Demo做了SQL Server 2000 的 使用事务范围实现隐式事务测试，事务可以正常提交以及回滚：
private void Test1() 
{
// 使用事务范围实现隐式事务 // ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.VisualStudio.v80.chs/dv_fxtransactions/html/1ddba95e-7587-48b2-8838-708c275e7199.htm
using (TransactionScope ts = new TransactionScope()) { //Create and open the SQL connection. The work done on this connection will be a part of the transaction created by the TransactionScope SqlConnection myConnection = new SqlConnection("server=(local);Integrated Security=SSPI;database=northwind"); SqlCommand myCommand = new SqlCommand(); myConnection.Open(); myCommand.Connection = myConnection; if (!chkGenError.Checked) { //Restore database to near it's original condition so sample will work correctly. myCommand.CommandText = "DELETE FROM Region WHERE (RegionID = 100) OR (RegionID = 101)"; myCommand.ExecuteNonQuery();
} //Insert the first record. myCommand.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (100, 'MidWestern')"; myCommand.ExecuteNonQuery(); //Insert the second record. myCommand.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (101, 'MidEastern')"; myCommand.ExecuteNonQuery(); myConnection.Close(); if (chkCommit.Checked) { ts.Complete(); } /**/////Call complete on the TransactionScope or not based on input //ConsoleKeyInfo c; //while (true) { // Console.Write("Complete the transaction scope? [Y|N] "); // c = Console.ReadKey(); // Console.WriteLine(); // if ((c.KeyChar == 'Y') || (c.KeyChar == 'y')) { // // Commit the transaction // ts.Complete(); // break; // } // else if ((c.KeyChar == 'N') || (c.KeyChar == 'n')) { // break; // } //} }
} private void Test2() { string connectString1 = "server=(local);Integrated Security=SSPI;database=northwind"; string connectString2 = "server=(local);Integrated Security=SSPI;database=pubs"; string dt = DateTime.Now.ToString(); using (TransactionScope transScope = new TransactionScope()) { using (SqlConnection connection1 = new SqlConnection(connectString1)) { // Opening connection1 automatically enlists it in the // TransactionScope as a lightweight transaction. connection1.Open(); // Do work in the first connection. SqlCommand command1 = new SqlCommand(); command1.Connection = connection1; //Restore database to near it's original condition so sample will work correctly. command1.CommandText = "DELETE FROM Region WHERE (RegionID = 100) OR (RegionID = 101)"; command1.ExecuteNonQuery(); //Insert the first record. command1.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (100, 'MidWestern')"; command1.ExecuteNonQuery(); //Insert the second record. command1.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (101, 'MidEastern')"; command1.ExecuteNonQuery(); // Assumes conditional logic in place where the second // connection will only be opened as needed. using (SqlConnection connection2 = new SqlConnection(connectString2)) { // Open the second connection, which enlists the // second connection and promotes the transaction to // a full distributed transaction. connection2.Open(); // Do work in the second connection. SqlCommand command2 = new SqlCommand(); command2.Connection = connection2; if (!chkGenError.Checked) { //Restore database to near it's original condition so sample will work correctly. command2.CommandText = "DELETE FROM stores WHERE (stor_id = '9797') OR (stor_id = '9798')"; command2.ExecuteNonQuery(); } //Insert the first record. command2.CommandText = "Insert into stores (stor_id, stor_name) VALUES ('9797', 'ebay')"; command2.ExecuteNonQuery(); //Insert the second record. command2.CommandText = "Insert into stores (stor_id, stor_name) VALUES ('9798', 'amazon')"; command2.ExecuteNonQuery(); } } // The Complete method commits the transaction. if (chkCommit.Checked) { transScope.Complete(); } } } private void Test3() { string connectString1 = "server=(local);Integrated Security=SSPI;database=northwind"; string connectString2 = "server=(local);Integrated Security=SSPI;database=pubs"; string dt = DateTime.Now.ToString(); using (TransactionScope transScope = new TransactionScope()) { using (SqlConnection connection1 = new SqlConnection(connectString1)) { // Opening connection1 automatically enlists it in the // TransactionScope as a lightweight transaction. connection1.Open(); // Do work in the first connection. SqlCommand command1 = new SqlCommand(); command1.Connection = connection1; //Restore database to near it's original condition so sample will work correctly. command1.CommandText = "DELETE FROM Region WHERE (RegionID = 100) OR (RegionID = 101)"; command1.ExecuteNonQuery(); //Insert the first record. command1.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (100, 'MidWestern')"; command1.ExecuteNonQuery(); //Insert the second record. command1.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (101, 'MidEastern')"; command1.ExecuteNonQuery(); } // Assumes conditional logic in place where the second // connection will only be opened as needed. using (SqlConnection connection2 = new SqlConnection(connectString2)) { // Open the second connection, which enlists the // second connection and promotes the transaction to // a full distributed transaction. connection2.Open(); // Do work in the second connection. SqlCommand command2 = new SqlCommand(); command2.Connection = connection2; if (!chkGenError.Checked) { //Restore database to near it's original condition so sample will work correctly. command2.CommandText = "DELETE FROM stores WHERE (stor_id = '9797') OR (stor_id = '9798')"; command2.ExecuteNonQuery(); } //Insert the first record. command2.CommandText = "Insert into stores (stor_id, stor_name) VALUES ('9797', 'ebay')"; command2.ExecuteNonQuery(); //Insert the second record. command2.CommandText = "Insert into stores (stor_id, stor_name) VALUES ('9798', 'amazon')"; command2.ExecuteNonQuery(); } // The Complete method commits the transaction. if (chkCommit.Checked) { transScope.Complete(); } } } 测试的时候需要在 Sql Server 服务管理器中开启 MSDTC，我是再 SQL 2k上做的测试，2k5上应该得到更好的支持。
方法 Test1() 是单数据库的事务，只是为了测试；
Test2()和Test3() 没有实质区别，都是自动注册事务。
完整代码下载：/Files/Jinglecat/DTCSQL.rar
同时我也尝试了一个Oracle版本，Oracle 10g 2，其中数据库orcl 是默认的启动数据库，而数据库nhrs是我自己建的一个数据库，测试通过，代码跟SQL没有两样，之前网上查到有网友说OracleClient还不支持 MSDTC，查了很多资料，确实在 ado.net 1.x 有问题，现在可以确信 ado.net 2.0 已经可以支持。
完整代码下载：/Files/Jinglecat/DTCORA.rar
现在银杏事务已经可以满数项目需求了，有时间再多更多的研究了^_^
