c#事务

1、创建事务的结构

SqlConnection   sqlConnection   =   new   SqlConnection();     ...初始化连接     //   开启事务     SqlTransaction   sqlTransaction   =   sqlConnection.BeginTransaction();     //   将事务应用于Command     SqlCommand   sqlCommand   =   new   SqlCommand();     sqlCommand.Connection   =   sqlConnection;     sqlCommand.Transaction   =   sqlTransaction;       try     {     //   利用sqlcommand进行数据操作     ...     //   成功提交     sqlTransaction.Commit();     }     catch(Exception   ex)     {     //   出错回滚     sqlTransaction.Rollback();     }  

2、简单例子

                  {                             DataTable   dt   =   new   DataTable();                             System.Data.SqlClient.SqlConnection   cnn   =   new   System.Data.SqlClient.SqlConnection("连接字符串");                             System.Data.SqlClient.SqlCommand   cm   =   new   System.Data.SqlClient.SqlCommand();                             cm.Connection   =   cnn;                             cnn.Open();                             System.Data.SqlClient.SqlTransaction   trans   =   cnn.BeginTransaction();                             try                             {                                     foreach(DataRow   dr   in   dt.Rows)                                     {                                            cm.CommandText   =   "update   [表]   set   [数量]   =   @amount   where   productID   =   @productID";                                             cm.Parameters.Add("@amount",SqlDbType.Int);                                             cm.Parameters["@amount"].Value   =   Convert.ToInt32(dr["amount"]);                                             cm.Parameters.Add("@productID",SqlDbType.VarChar);                                             cm.Parameters["@productID"].Value   =   dr["productID"].ToString();                                             cm.ExecuteNonQuery();                                     }                                     trans.Commit();                             }                             catch                             {                                     trans.Rollback();                             }                             finally                             {                                     cnn.Close();                                     trans.Dispose();                                     cnn.Dispose();                             }                     }

3、SQl server中的事务例子

begin transaction save transaction A

insert into demo values('BB','B term') rollback TRANSACTION A

create table demo2(name varchar(10),age int) insert into demo2(name,age) values('lis',1) rollback transaction

insert into demo values('BB','B term')

commit TRANSACTION A

commit TRANSACTION 

4、注意

  1。事务必须在连接打开后BeginTransaction();

  2.事务添加到SqlCommand（sqlCommand.Transaction   =   sqlTransaction;   ）

  3、其他数据库对应做相应调整

  4、可以用微软提供的一个dll,很方便.