我有一个称为“ db”的通用类,它直接与数据库对话。并有一个名为“ ExecuteDataReader”的方法,如下所示:

public SqlDataReader ExecuteDataReader(SqlCommand cmd)
        {
            try
            {
                OpenConnection();
                cmd.Connection = conn;
                cmd.CommandType = CommandType.StoredProcedure;

                SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

                return dr;
            }
            catch (Exception ex)
            {
                Utils.Debug(string.Format("Err in {0}.{1} : {2}\nSQL : {3}", this.GetType(), "ExecuteDataReader", ex.Message, cmd.CommandText));
                return null;
            }
        }


然后,我执行资源密集型查询,该查询循环遍历10000个父记录和20000个子记录以在数据库中进行更新。然后我得到以下错误:

Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.


为了解决这些问题,我必须在执行后显式调用dr.Close()。

static void ProcessAssessmentCriteria(string UnitReference)
        {
            SqlCommand cmd = new SqlCommand("TRACKING.DBTool_GetUniqueAssessmentCriteriaByUnitReference");
            cmd.Parameters.Add("@UnitReference", SqlDbType.VarChar, 20).Value = UnitReference;

            SqlDataReader dr = db.ExecuteDataReader(cmd);

            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    ProcessDetailAssessmentCriteria(UnitReference, dr["AssessmentRefNumber"].ToString());
                    Console.WriteLine("---------------");
                }
            }

            dr.Close();
        }


据我所知,CommandBehaviour.CloseConnection()会自动关闭连接。但是,看来现在还没有关闭。你能启发我吗?谢谢。

最佳答案

MSDN中的CommandBehavior.CloseConnection


  执行该命令时,关联的Connection对象为
  当关联的DataReader对象关闭时关闭。


因此,仅当您关闭DataReader时,连接才会关闭。

10-02 15:01