/// <summary> /// Advances the data reader to the next result, when reading the results of batch SQL statements. /// </summary> /// <returns></returns> public override bool NextResult() { if (!isOpen) throw new MySqlException(ResourceStrings.NextResultIsClosed); bool isCaching = command.CommandType == CommandType.TableDirect && command.EnableCaching && (commandBehavior & CommandBehavior.SequentialAccess) == 0; // this will clear out any unread data if (resultSet != null) { resultSet.Close(); if (isCaching) TableCache.AddToCache(command.CommandText, resultSet); } // single result means we only return a single result set. If we have already // returned one, then we return false // TableDirect is basically a select * from a single table so it will generate // a single result also if (resultSet != null && ((commandBehavior & CommandBehavior.SingleResult) != 0 || isCaching)) return false; // next load up the next result set if any try { do { resultSet = null; // if we are table caching, then try to retrieve the resultSet from the cache if (isCaching) resultSet = TableCache.RetrieveFromCache(command.CommandText, command.CacheAge); if (resultSet == null) { resultSet = driver.NextResult(Statement.StatementId, false); if (resultSet == null) return false; resultSet.Cached = isCaching; } if (resultSet.Size == 0) { Command.lastInsertedId = resultSet.InsertedId; if (affectedRows == -1) affectedRows = resultSet.AffectedRows; else affectedRows += resultSet.AffectedRows; } } while (resultSet.Size == 0); return true; } catch (MySqlException ex) { if (ex.IsFatal) connection.Abort(); if (ex.Number == 0) throw new MySqlException(ResourceStrings.FatalErrorReadingResult, ex); if ((commandBehavior & CommandBehavior.CloseConnection) != 0) Close(); throw; } }
private void ReportUsageAdvisorWarnings(int statementId, ResultSet rs) { if (!Settings.UseUsageAdvisor) return; if (HasStatus(ServerStatusFlags.NoIndex)) MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningNoIndex, driverId, UsageAdvisorWarningFlags.NoIndex); else if (HasStatus(ServerStatusFlags.BadIndex)) MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningBadIndex, driverId, UsageAdvisorWarningFlags.BadIndex); // report abandoned rows if (rs.SkippedRows > 0) MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningSkippedRows, driverId, UsageAdvisorWarningFlags.SkippedRows, rs.SkippedRows); // report not all fields accessed if (!AllFieldsAccessed(rs)) { StringBuilder notAccessed = new StringBuilder(""); string delimiter = ""; for (int i = 0; i < rs.Size; i++) if (!rs.FieldRead(i)) { notAccessed.AppendFormat("{0}{1}", delimiter, rs.Fields[i].ColumnName); delimiter = ","; } MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningSkippedColumns, driverId, UsageAdvisorWarningFlags.SkippedColumns, notAccessed.ToString()); } // report type conversions if any if (rs.Fields != null) { foreach (MySqlField f in rs.Fields) { StringBuilder s = new StringBuilder(); string delimiter = ""; foreach (Type t in f.TypeConversions) { s.AppendFormat("{0}{1}", delimiter, t.Name); delimiter = ","; } if (s.Length > 0) MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningFieldConversion, driverId, UsageAdvisorWarningFlags.FieldConversion, f.ColumnName, s.ToString()); } } }
private bool AllFieldsAccessed(ResultSet rs) { if (rs.Fields == null || rs.Fields.Length == 0) return true; for (int i = 0; i < rs.Fields.Length; i++) if (!rs.FieldRead(i)) return false; return true; }
public override ResultSet NextResult(int statementId, bool force) { // first let's see if we already have a resultset on this statementId if (activeResult != null) { //oldRS = activeResults[statementId]; if (Settings.UseUsageAdvisor) ReportUsageAdvisorWarnings(statementId, activeResult); MySqlTrace.TraceEvent(TraceEventType.Information, MySqlTraceEventType.ResultClosed, Resources.TraceResultClosed, driverId, activeResult.TotalRows, activeResult.SkippedRows, rowSizeInBytes); rowSizeInBytes = 0; activeResult = null; } activeResult = base.NextResult(statementId, force); return activeResult; }
private void ReportUsageAdvisorWarnings(int statementId, ResultSet rs) { if (!Settings.UseUsageAdvisor) { return; } if (HasStatus(ServerStatusFlags.NoIndex)) { MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningNoIndex, driverId, UsageAdvisorWarningFlags.NoIndex); } else if (HasStatus(ServerStatusFlags.BadIndex)) { MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningBadIndex, driverId, UsageAdvisorWarningFlags.BadIndex); } // report abandoned rows if (rs.SkippedRows > 0) { MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningSkippedRows, driverId, UsageAdvisorWarningFlags.SkippedRows, rs.SkippedRows); } // report not all fields accessed if (!AllFieldsAccessed(rs)) { StringBuilder notAccessed = new StringBuilder(""); string delimiter = ""; for (int i = 0; i < rs.Size; i++) { if (!rs.FieldRead(i)) { notAccessed.AppendFormat("{0}{1}", delimiter, rs.Fields[i].ColumnName); delimiter = ","; } } MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningSkippedColumns, driverId, UsageAdvisorWarningFlags.SkippedColumns, notAccessed.ToString()); } // report type conversions if any if (rs.Fields != null) { foreach (MySqlField f in rs.Fields) { StringBuilder s = new StringBuilder(); string delimiter = ""; foreach (Type t in f.TypeConversions) { s.AppendFormat("{0}{1}", delimiter, t.Name); delimiter = ","; } if (s.Length > 0) { MySqlTrace.TraceEvent(TraceEventType.Warning, MySqlTraceEventType.UsageAdvisorWarning, Resources.TraceUAWarningFieldConversion, driverId, UsageAdvisorWarningFlags.FieldConversion, f.ColumnName, s.ToString()); } } } }
public static void AddToCache(string commandText, ResultSet resultSet) { cache.AddToCache(commandText, resultSet); }