/// <summary> /// Advances the MyCatDataReader to the next record. /// </summary> /// <returns></returns> public override bool Read() { if (!isOpen) { Throw(new MyCatException("Invalid attempt to Read when reader is closed.")); } if (resultSet == null) { return(false); } try { return(resultSet.NextRow(commandBehavior)); } catch (TimeoutException tex) { connection.HandleTimeoutOrThreadAbort(tex); throw; // unreached } catch (ThreadAbortException taex) { connection.HandleTimeoutOrThreadAbort(taex); throw; } catch (MyCatException ex) { if (ex.IsFatal) { connection.Abort(); } if (ex.IsQueryAborted) { throw; } throw new MyCatException(Resources.FatalErrorDuringRead, ex); } }
private MyCatDataReader _ExecuteReader(CommandBehavior behavior, string sql) { #if !NETSTANDARD1_3 // give our interceptors a shot at it first MyCatDataReader interceptedReader = null; if (connection != null && connection.commandInterceptor != null && connection.commandInterceptor.ExecuteReader(CommandText, behavior, ref interceptedReader)) { return(interceptedReader); } #endif // interceptors didn't handle this so we fall through bool success = false; CheckState(); Driver driver = connection.driver; cmdText = cmdText.Trim(); if (String.IsNullOrEmpty(cmdText)) { Throw(new InvalidOperationException(Resources.CommandTextNotInitialized)); } lock (driver) { #if !NETSTANDARD1_3 System.Transactions.Transaction curTrans = System.Transactions.Transaction.Current; if (curTrans != null) { bool inRollback = false; if (driver.CurrentTransaction != null) { inRollback = driver.CurrentTransaction.InRollback; } if (!inRollback) { System.Transactions.TransactionStatus status = System.Transactions.TransactionStatus.InDoubt; try { // in some cases (during state transitions) this throws // an exception. Ignore exceptions, we're only interested // whether transaction was aborted or not. status = curTrans.TransactionInformation.Status; } catch (System.Transactions.TransactionException) { } if (status == System.Transactions.TransactionStatus.Aborted) { Throw(new System.Transactions.TransactionAbortedException()); } } } #endif commandTimer = new CommandTimer(connection, CommandTimeout); lastInsertedId = -1; if (CommandType == CommandType.TableDirect) { sql = "SELECT * FROM " + sql; } else if (CommandType == CommandType.Text) { // validates single word statetment (maybe is a stored procedure call) if (sql.IndexOf(" ") == -1) { if (AddCallStatement(sql)) { sql = "call " + sql; } } } // if we are on a replicated connection, we are only allow readonly statements if (connection.Settings.Replication && !InternallyCreated) { EnsureCommandIsReadOnly(sql); } if (statement == null || !statement.IsPrepared) { if (CommandType == CommandType.StoredProcedure) { statement = new StoredProcedure(this, sql); } else { statement = new PreparableStatement(this, sql); } } // stored procs are the only statement type that need do anything during resolve statement.Resolve(false); // Now that we have completed our resolve step, we can handle our // command behaviors HandleCommandBehaviors(behavior); try { MyCatDataReader reader = new MyCatDataReader(this, statement, behavior); connection.Reader.Add(reader); canceled = false; // execute the statement statement.Execute(); // wait for data to return reader.NextResult(); success = true; return(reader); } catch (TimeoutException tex) { connection.HandleTimeoutOrThreadAbort(tex); throw; //unreached } catch (ThreadAbortException taex) { connection.HandleTimeoutOrThreadAbort(taex); throw; } catch (IOException ioex) { connection.Abort(); // Closes connection without returning it to the pool throw new MyCatException(Resources.FatalErrorDuringExecute, ioex); } catch (MyCatException ex) { if (ex.InnerException is TimeoutException) { throw; // already handled } try { ResetReader(); ResetSqlSelectLimit(); } catch (Exception) { // Reset SqlLimit did not work, connection is hosed. Connection.Abort(); throw new MyCatException(ex.Message, true, ex); } // if we caught an exception because of a cancel, then just return null if (ex.IsQueryAborted) { return(null); } if (ex.IsFatal) { Connection.Close(); } if (ex.Number == 0) { throw new MyCatException(Resources.FatalErrorDuringExecute, ex); } throw; } finally { if (connection != null) { if (connection.Reader == null) { // Something went seriously wrong, and reader would not // be able to clear timeout on closing. // So we clear timeout here. ClearCommandTimer(); } if (!success) { // ExecuteReader failed.Close Reader and set to null to // prevent subsequent errors with DataReaderOpen ResetReader(); } } } } }