Better result formatting

Cells holding a NULL value now display null in gray.
int, float and numeric columns are right aligned. Integers, floats and numerics are coloured.
Booleans, green or red for true or false. t, f is replaced by TRUE, FALSE

PgsqlConn.cpp

@@ -163,6 +163,15 @@ const char * Result::getVal(int col, int row) const
     return PQgetvalue(result, row, col);
 }
 
+Oid Result::type(int col) const
+{
+	return PQftype(result, col);
+}
+
+bool Result::null(int col, int row) const
+{
+	return PQgetisnull(result, row, col);
+}
 
 Canceller::Canceller(PGcancel *c)
 	: m_cancel(c)

PgsqlConn.h

@@ -10,6 +10,16 @@
 
 namespace Pgsql {
 
+	const Oid oid_bool = 16;
+	const Oid oid_int2 = 21;
+	const Oid oid_int4 = 23;
+	const Oid oid_int8 = 20;
+	const Oid oid_float4 = 700;
+	const Oid oid_float8 = 701;
+	const Oid oid_numeric = 1700;
+	const Oid oid_oid = 26;
+
+
 	class Connection;
 	/*
 	This library has multiple layers.
@@ -120,6 +130,9 @@ namespace Pgsql {
 		const char* const getColName(int idx) const;
 
 		const char * getVal(int col, int row) const;
+		Oid type(int col) const;
+		bool null(int col, int row) const;
+
 
 //		iterator begin();
 	private:

mainwindow.cpp

@@ -109,6 +109,8 @@ MainWindow::MainWindow(QWidget *parent)
 //	action = ui->mainToolBar->addAction("cancel");
 //	connect(action, &QAction::triggered, this, &MainWindow::cancel_query);
 
+	//ui->ResultView->setItemDelegate();
+
 	m_dbConnection.setStateCallback([this](ASyncDBConnection::State st)
 		{
 			QueueTask([this, st]() { connectionStateChanged(st); });

queryresultmodel.cpp

@@ -1,4 +1,6 @@
 #include "queryresultmodel.h"
+#include <QBrush>
+#include <QColor>
 
 QueryResultModel::QueryResultModel(QObject *parent, std::shared_ptr<Pgsql::Result> r)
 	: QAbstractTableModel(parent)
@@ -18,23 +20,97 @@ int QueryResultModel::columnCount(const QModelIndex &) const
 	return r;
 }
 
+//DisplayRole = 0,
+//DecorationRole = 1,
+//EditRole = 2,
+//ToolTipRole = 3,
+//StatusTipRole = 4,
+//WhatsThisRole = 5,
+//// Metadata
+//FontRole = 6,
+//TextAlignmentRole = 7,
+//BackgroundColorRole = 8,
+//BackgroundRole = 8,
+//TextColorRole = 9,
+//ForegroundRole = 9,
+//CheckStateRole = 10,
+
 QVariant QueryResultModel::data(const QModelIndex &index, int role) const
 {
+	using namespace Pgsql;
+
 	QVariant r;
 	int rij = index.row();
 	int col = index.column();
 	if (role == Qt::DisplayRole) {
-
+		if (result->null(col, rij)) {
-		r = QString(result->getVal(col, rij));
+			r = "null";
-	}
-	else if (role == Qt::TextAlignmentRole) {
-		if (col == 0) {
-			r = Qt::AlignRight + Qt::AlignVCenter;
 		}
 		else {
+			Oid o = result->type(col);
+			QString s(result->getVal(col, rij));
+			switch (o) {
+			case oid_bool:
+				s = (s == "t") ? "TRUE" : "FALSE";
+				// intentional fall through
+			default:
+				r = s;
+			}
+
+
+		}
+	}
+	else if (role == Qt::TextAlignmentRole) {
+		Oid o = result->type(col);
+		switch (o) {
+		case oid_int2:
+		case oid_int4:
+		case oid_int8:
+		case oid_float4:
+		case oid_float8:
+		case oid_numeric:
+		case oid_oid:
+			r = Qt::AlignRight + Qt::AlignVCenter;
+			break;
+		case oid_bool:
+			r = Qt::AlignCenter;
+			break;
+		default:
 			r = Qt::AlignLeft + Qt::AlignVCenter;
 		}
 	}
+	else if (role == Qt::ForegroundRole) {
+		if (result->null(col, rij)) {
+			r = QBrush(Qt::gray);
+		}
+		else {
+			Oid o = result->type(col);
+			switch (o) {
+			case oid_int2:
+			case oid_int4:
+			case oid_int8:
+				r = QBrush(Qt::darkBlue);
+				break;
+			case oid_float4:
+			case oid_float8:
+				r = QBrush(Qt::darkCyan);
+				break;
+			case oid_numeric:
+				r = QBrush(Qt::darkGreen);
+				break;
+			case oid_bool:
+				if (strcmp(result->getVal(col, rij), "t") == 0) {
+					r = QBrush(Qt::darkGreen);
+				}
+				else {
+					r = QBrush(Qt::darkRed);
+				}
+				break;
+			default:
+				break;
+			}
+		}
+	}
 	return r;
 }