/// <summary>
/// <paramref name="oraCommand"/> 를 이용하여, <see cref="Task{OracleDataReader}"/>를 반환받습니다.
/// 받환받은 DataReader는 꼭 Dispose() 해 주어야 Connection이 닫힙니다.
/// </summary>
/// <param name="oraDatabase">Devart dotConnector for Oracle을 이용하여 생성한 OracleProvider</param>
/// <param name="oraCommand">실행할 OracleCommand 인스턴스</param>
/// <param name="parameters">Command Parameters</param>
/// <returns>OracleDataReader를 결과로 반환하는 Task</returns>
public static Task <OracleDataReader> ExecuteReaderAsync(this EnterpriseLibrary.OracleDatabase oraDatabase,
OracleCommand oraCommand, params IAdoParameter[] parameters)
{
oraCommand.ShouldNotBeNull("oraCommand");
if (IsDebugEnabled)
{
log.Debug("OracleCommand.ExecuteReader를 비동기 방식으로 실행합니다. CommandText=[{0}], Parameters=[{1}]",
oraCommand.CommandText, parameters.CollectionToString());
}
var newConnectionCreated = false;
if (oraCommand.Connection == null)
{
oraCommand.Connection = oraDatabase.CreateOracleConnection(ref newConnectionCreated);
}
if (parameters != null)
{
AdoTool.SetParameterValues(oraDatabase, oraCommand, parameters);
}
var commandBehavior = newConnectionCreated ? CommandBehavior.CloseConnection : CommandBehavior.Default;
// NOTE: FromAsync를 사용하지 못한 이유가 OracleCommand.BeginExecuteReader() 의 overloading이 많아서, 모호한 함수 호출 때문이다.
//
var ar = oraCommand.BeginExecuteReader(commandBehavior);
return
(Task <OracleDataReader> .Factory.StartNew(state => oraCommand.EndExecuteReader((IAsyncResult)state),
ar,
TaskCreationOptions.PreferFairness));
}