c# 之 事务

SqlTransaction事务的简单例子

{
                          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();
                          }
                  }