/// <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(Resources.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 resultset. 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 resultset 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);
}
if (resultSet.IsOutputParameters && command.CommandType == CommandType.StoredProcedure)
{
StoredProcedure sp = statement as StoredProcedure;
sp.ProcessOutputParameters(this);
resultSet.Close();
if (!sp.ServerProvidingOutputParameters)
{
return(false);
}
// if we are using server side output parameters then we will get our ok packet
// *after* the output parameters resultset
resultSet = driver.NextResult(Statement.StatementId, true);
}
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(Resources.FatalErrorReadingResult, ex);
}
if ((commandBehavior & CommandBehavior.CloseConnection) != 0)
{
Close();
}
throw;
}
}
