How SqlHelper encapsulates SqlDataReader in c#

The example of this article describes the method of encapsulating SqlDataReader by SqlHelper in c#. Share it with everyone for your reference. The details are as follows:

/// <summary>
/// 执行sql语句返回一个DataReader
/// 当返回DataReader的时候，注意：
/// 1.Connection不能关闭
/// 2.DataReader不能关闭
/// 3.command对象执行ExecuteReader()的时候需要传递一个参数CommandBehavior.CloseConnection
/// </summary>
/// <param name="sql"></param>
/// <param name="pms"></param>
/// <returns></returns>
public static SqlDataReader ExecuteReader(string sql, params SqlParameter[] pms)
{
 SqlConnection con = new SqlConnection(constr);
 using (SqlCommand cmd = new SqlCommand(sql, con))
 {
  if (pms != null)
  {
   cmd.Parameters.AddRange(pms);
  }
  con.Open();
  //当调用ExecuteReader()方法的时候，如果传递一个CommandBehavior.CloseConnection参数，
  //则表示将来当用户关闭reader的时候，系统会自动将Connection也关闭掉。
  SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
  return reader;
 }
}

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