C# OleDbDataReader快速数据读取方式(3种)

  static void Main(string[] args)

  {

  string connstr = string.Format("Provider=Microsoft.Jet.OLEDB.4.0 ;Data Source={0};", "F:2.mdb");

  string s1 = "ID";

  string s2 = "探测号";

  string s3 = "X";

  string s4 = "Y";

  string s5 = "H";

  string sql = string.Format("SELECT {0},{1},{2},{3},{4} FROM 管点表", s1, s2, s3, s4, s5);

  TimeSpan time1 = new TimeSpan();

  TimeSpan time2 = new TimeSpan();

  TimeSpan time3 = new TimeSpan();

  int count = 50;

  //数据库中查询的表有105945行

  for (int i = 0; i < count; i++)

  {

  using (OleDbConnection conn = new OleDbConnection(connstr))

  {

  #region

  conn.Open();

  OleDbCommand command = conn.CreateCommand();

  command.CommandText = sql;

  OleDbDataReader reader = command.ExecuteReader();

  DateTime now = DateTime.Now;

  while (reader.Read())

  {

  var t1 = reader[0]; var t2 = reader[1]; var t3 = reader[2]; var t4 = reader[3]; var t5 = reader[4];

  }

  time1 = time1 + (DateTime.Now - now);

  #endregion

  }

  }

  for (int i = 0; i < count; i++)

  {

  using (OleDbConnection conn = new OleDbConnection(connstr))

  {

  #region

  conn.Open();

  OleDbCommand command2 = conn.CreateCommand();

  command2.CommandText = sql;

  OleDbDataReader reader = command2.ExecuteReader();

  DateTime now = DateTime.Now;

  while (reader.Read())

  {

  var t1 = reader[s1]; var t2 = reader[s2]; var t3 = reader[s3]; var t4 = reader[s4]; var t5 = reader[s5];

  }

  time2 = time2 + (DateTime.Now - now);

  #endregion

  }

  }

  for (int i = 0; i < count; i++)

  {

  using (OleDbConnection conn = new OleDbConnection(connstr))

  {

  #region

  conn.Open();

  OleDbCommand command3 = conn.CreateCommand();

  command3.CommandText = sql;

  OleDbDataReader reader = command3.ExecuteReader();

  DateTime now = DateTime.Now;

  while (reader.Read())

  {

  var t1 = reader.GetValue(0); var t2 = reader.GetValue(1); var t3 = reader.GetValue(2); var t4 = reader.GetValue(3); var t5 = reader.GetValue(4);

  }

  time3 = time3 + (DateTime.Now - now);

  #endregion

  }

  }

  Console.WriteLine(string.Format("方法一:

  耗时:{0}s", time1.TotalSeconds));

  Console.WriteLine(string.Format("方法二:

  耗时:{0}s", time2.TotalSeconds));

  Console.WriteLine(string.Format("方法三:

  耗时:{0}s", time3.TotalSeconds));

  Console.ReadKey();

  }