Query is now executed using std::async

PgsqlConn.cpp

@@ -41,7 +41,7 @@ Result::operator bool() const
 	return result != nullptr;
 }
 
-ExecStatusType Result::getResultStatus()
+ExecStatusType Result::resultStatus()
 {
 	return PQresultStatus(result);
 }
@@ -159,8 +159,6 @@ Result Connection::query(const char * command)
 }
 
 
-
-
 bool Connection::sendQuery(const char *query)
 {
 	int res = PQsendQuery(conn, query);
@@ -177,3 +175,15 @@ std::unique_ptr<Result> Connection::getResult()
 		return nullptr;
 	}
 }
+
+bool Connection::consumeInput()
+{
+	int res = PQconsumeInput(conn);
+	return res == 1;
+}
+
+bool Connection::isBusy()
+{
+	int res = PQisBusy(conn);
+	return res == 1;
+}

PgsqlConn.h

@@ -63,6 +63,7 @@ namespace Pgsql {
 //			int row;
 //		};
 
+		Result() = default;
 		Result(PGresult *result);
 		~Result();
 
@@ -74,7 +75,7 @@ namespace Pgsql {
 
 		operator bool() const;
 
-		ExecStatusType getResultStatus();
+		ExecStatusType resultStatus();
 		std::string getResStatus();
 
 
@@ -129,6 +130,11 @@ namespace Pgsql {
 		}
 
 		bool sendQuery(const char * query);
+		bool sendQuery(const QString &command)
+		{
+			return sendQuery(command.toUtf8().data());
+		}
+
 		std::unique_ptr<Result> getResult();
 
 		bool consumeInput();

mainwindow.cpp

@@ -5,13 +5,21 @@
 #include "sqlhighlighter.h"
 
 #include <windows.h>
+//#include <thread>
 
 namespace pg = Pgsql;
 
 const char * test_query =
-	"SELECT id, program, version, lic_bedrijf, lic_plaats, "
+
-	"lic_number, callstack_crc_1, callstack_crc_2, callstack_crc_3, exception_class, "
+//"SELECT id, program, version, lic_bedrijf, lic_plaats, "
-	"exception_message \nFROM foutrapport";
+//"lic_number, callstack_crc_1, callstack_crc_2, callstack_crc_3, exception_class, "
+//"exception_message \nFROM foutrapport"
+
+"SELECT f1.id, f1.program, f1.version, f1.lic_number, f1.callstack_crc_1, f1.callstack_crc_2, array_agg(f2.id) \n"
+"FROM foutrapport f1 JOIN foutrapport f2 USING (callstack_crc_2) \n"
+"WHERE f1.actief  \n"
+"GROUP BY f1.id"
+;
 
 MainWindow::MainWindow(QWidget *parent) :
 	QMainWindow(parent),
@@ -29,8 +37,6 @@ MainWindow::MainWindow(QWidget *parent) :
 
 	ui->connectionStringEdit->setText("user=postgres dbname=foutrapport password=admin");
 
-	//performQuery();
-
 	QAction *action;
 	action = ui->mainToolBar->addAction("connect");
 	connect(action, &QAction::triggered, this, &MainWindow::startConnect);
@@ -97,9 +103,24 @@ void MainWindow::performQuery()
 	ui->ResultView->setModel(nullptr);
 	resultModel.reset();
 
-	if (connection->status() == CONNECTION_OK) {
+	QString command = ui->queryEdit->toPlainText();
-		pg::Result dbres = connection->query(ui->queryEdit->toPlainText());
+	queryFuture = std::async(std::launch::async, [this,command]()-> Pgsql::Result
-		resultModel.reset(new QueryResultModel(this , std::move(dbres)));
+		{
+			auto res = connection->query(command);
+			QMetaObject::invokeMethod(this, "query_ready",	 Qt::QueuedConnection); // queues on main thread
+			return res;
+		});
+}
+
+void MainWindow::query_ready()
+{
+	pg::Result dbres(std::move(queryFuture.get()));
+	if (dbres.resultStatus() == PGRES_TUPLES_OK) {
+		resultModel.reset(new QueryResultModel(nullptr , std::move(dbres)));
 		ui->ResultView->setModel(resultModel.get());
 	}
+	else {
+		statusBar()->showMessage(tr("No tuples returned, possibly an error..."));
+	}
 }
+

mainwindow.h

@@ -4,6 +4,7 @@
 #include <QMainWindow>
 #include <QSocketNotifier>
 #include <memory>
+#include <future>
 #include "PgsqlConn.h"
 
 class QueryResultModel;
@@ -34,17 +35,25 @@ private:
 	std::unique_ptr<Pgsql::Connection> connection;
 	std::unique_ptr<QueryResultModel> resultModel;
 
+	std::future<Pgsql::Result> queryFuture;
+
 	struct {
 		std::unique_ptr<QSocketNotifier> notifier;
 		PostgresPollingStatusType poll_state;
 	} connectingState;
 
+//	struct {
+//		std::unique_ptr<QSocketNotifier> notifierRead;
+//		std::unique_ptr<QSocketNotifier> notifierWrite;
+//	} queryState;
+
 private slots:
 
 	void startConnect();
 
 	void performQuery();
 	void socket_activate_connect(int socket);
+	void query_ready();
 };
 
 #endif // MAINWINDOW_H