ado.net 中事务的使用

SqlHelper 类方法中启用事务

 public static int UpdateByTran(List<string> sqlList)
         {
             SqlConnection conn = new SqlConnection(connString);
             SqlCommand cmd = new SqlCommand();
             cmd.Connection = conn;
             try
             {
                 conn.Open();
                 cmd.Transaction = conn.BeginTransaction();//开启事务
                 int result = ;
                 foreach (string sql in sqlList)
                 {
                     cmd.CommandText = sql;
                     result += cmd.ExecuteNonQuery();
                 }
                 cmd.Transaction.Commit();//提交事务
                 return result;
             }
             catch (Exception ex)
             {
                 //写入日志...
                 if (cmd.Transaction != null)
                     cmd.Transaction.Rollback();//回滚事务
                 throw new Exception("调用事务更新方法时出现异常：" + ex.Message);
             }
             finally
             {
                 if (cmd.Transaction != null)
                     cmd.Transaction = null;//清除事务
                 conn.Close();
             }
         }

调用

 static void Main(string[] args)
         {
             List<string> sqlList = new List<string>()
             {
                 "delete from ScoreList where StudentId=100013",
                 "delete from ScoreList where StudentId=100014",
                 "delete from ScoreList where StudentId=100011", 
 
                 "delete from Students where StudentId=100010",
                 "delete from Students where StudentId=100013",
                 "delete from Students where StudentId=100014",
                 "delete from Students where StudentId=100011",
             };
             string sql = "select count(*) from Students";
             Console.WriteLine("删除前学生总数：{0}", SQLHelper.GetSingleResult(sql).ToString());
             Console.WriteLine("------------------------------------------------------------");
             int result = ;
             try
             {
                 result = SQLHelper.UpdateByTran(sqlList);
             }
             catch (Exception ex)
             {
                 Console.WriteLine(ex.Message);
                 Console.WriteLine("------------------------------------------------------------");
             }
             if (result > )
                 Console.WriteLine("删除成功！");
             else
                 Console.WriteLine("删除失败！");
             Console.WriteLine("------------------------------------------------------------");
             Console.WriteLine("删除后学生总数：{0}", SQLHelper.GetSingleResult(sql).ToString());
             Console.ReadLine();
         }