public async Task <bool> MoveNext(CancellationToken cancellationToken)
{
if (_dataReader == null)
{
await _relationalQueryContext.Connection.OpenAsync(cancellationToken);
try
{
var relationalCommand = _querySqlGenerator
.GetCommand(
_selectExpression,
_relationalQueryContext.ParameterValues,
_relationalQueryContext.CommandLogger);
_dataReader
= await relationalCommand.ExecuteReaderAsync(
_relationalQueryContext.Connection,
_relationalQueryContext.ParameterValues,
_relationalQueryContext.CommandLogger,
cancellationToken);
}
catch (Exception exception)
{
_logger.QueryIterationFailed(_contextType, exception);
// If failure happens creating the data reader, then it won't be available to
// handle closing the connection, so do it explicitly here to preserve ref counting.
_relationalQueryContext.Connection.Close();
throw;
}
}
try
{
var hasNext = await _dataReader.ReadAsync(cancellationToken);
Current
= hasNext
? await _shaper(_relationalQueryContext, _dataReader.DbDataReader)
: default;
return(hasNext);
}
catch (Exception exception)
{
_logger.QueryIterationFailed(_contextType, exception);
throw;
}
}
public bool MoveNext()
{
if (_dataReader == null)
{
_relationalQueryContext.Connection.Open();
try
{
var relationalCommand = _querySqlGenerator
.GetCommand(
_selectExpression,
_relationalQueryContext.ParameterValues,
_relationalQueryContext.CommandLogger);
_dataReader
= relationalCommand.ExecuteReader(
_relationalQueryContext.Connection,
_relationalQueryContext.ParameterValues,
_relationalQueryContext.CommandLogger);
}
catch
{
// If failure happens creating the data reader, then it won't be available to
// handle closing the connection, so do it explicitly here to preserve ref counting.
_relationalQueryContext.Connection.Close();
throw;
}
}
var hasNext = _dataReader.Read();
Current
= hasNext
? _shaper(_relationalQueryContext, _dataReader.DbDataReader)
: default;
return(hasNext);
}
