internal NpgsqlDataReader GetReader(CommandBehavior cb)
{
CheckConnectionState();
// Block the notification thread before writing anything to the wire.
using (_connector.BlockNotificationThread())
{
State = CommandState.InProgress;
NpgsqlDataReader reader;
_connector.SetBackendCommandTimeout(CommandTimeout);
if (_prepared == PrepareStatus.NeedsPrepare)
{
PrepareInternal();
}
if (_prepared == PrepareStatus.NotPrepared)
{
var commandText = GetCommandText();
// Write the Query message to the wire.
_connector.SendQuery(commandText);
// Tell to mediator what command is being sent.
if (_prepared == PrepareStatus.NotPrepared)
{
_connector.Mediator.SetSqlSent(commandText, NpgsqlMediator.SQLSentType.Simple);
}
else
{
_connector.Mediator.SetSqlSent(_preparedCommandText, NpgsqlMediator.SQLSentType.Execute);
}
reader = new NpgsqlDataReader(this, cb, _connector.BlockNotificationThread());
// For un-prepared statements, the first response is always a row description.
// For prepared statements, we may be recycling a row description from a previous Execute.
// TODO: This is the source of the inconsistency described in #357
reader.NextResult();
reader.UpdateOutputParameters();
if (
CommandType == CommandType.StoredProcedure
&& reader.FieldCount == 1
&& reader.GetDataTypeName(0) == "refcursor"
)
{
// When a function returns a sole column of refcursor, transparently
// FETCH ALL from every such cursor and return those results.
var sw = new StringWriter();
while (reader.Read())
{
sw.WriteLine(String.Format("FETCH ALL FROM \"{0}\";", reader.GetString(0)));
}
reader.Dispose();
var queryText = sw.ToString();
if (queryText == "")
{
queryText = ";";
}
// Passthrough the commandtimeout to the inner command, so user can also control its timeout.
// TODO: Check if there is a better way to handle that.
_connector.SendQuery(queryText);
reader = new NpgsqlDataReader(this, cb, _connector.BlockNotificationThread());
// For un-prepared statements, the first response is always a row description.
// For prepared statements, we may be recycling a row description from a previous Execute.
// TODO: This is the source of the inconsistency described in #357
reader.NextResultInternal();
reader.UpdateOutputParameters();
}
}
else
{
// Bind the parameters, execute and sync
for (var i = 0; i < _parameters.Count; i++)
_parameters[i].Bind(_connector.NativeToBackendTypeConverterOptions);
_connector.SendBind(AnonymousPortal, _planName, _parameters, _resultFormatCodes);
_connector.SendExecute();
_connector.SendSync();
// Tell to mediator what command is being sent.
_connector.Mediator.SetSqlSent(_preparedCommandText, NpgsqlMediator.SQLSentType.Execute);
// Construct the return reader, possibly with a saved row description from Prepare().
reader = new NpgsqlDataReader(this, cb, _connector.BlockNotificationThread(), true, _currentRowDescription);
if (_currentRowDescription == null) {
reader.NextResultInternal();
}
reader.UpdateOutputParameters();
}
return reader;
}
}
