PgAttribute loading + ColummnTableModel

Required enchancement to PgContainer to make multifield key work.

pglab/ColumnTableModel.h

@@ -0,0 +1,44 @@
+#ifndef COLUMNTABLEMODEL_H
+#define COLUMNTABLEMODEL_H
+
+#include "BaseTableModel.h"
+#include <memory>
+
+class PgDatabaseCatalog;
+class PgAttribute;
+
+class ColumnTableModel: public BaseTableModel {
+public:
+	enum e_Columns : int {
+		NameCol, ///
+		TypeCol,
+		NullCol,
+		DefaultCol,
+		CollationCol,
+
+		colCount };
+
+
+	using BaseTableModel::BaseTableModel;
+	void setData(std::shared_ptr<const PgDatabaseCatalog> cat, Oid table_oid);
+
+	// Header:
+	QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
+
+	// Basic functionality:
+	int rowCount(const QModelIndex &parent) const override;
+	int columnCount(const QModelIndex &parent) const override;
+
+	QVariant data(const QModelIndex &index, int role) const override;
+protected:
+	virtual Oid getType(int column) const override;
+	virtual QVariant getData(const QModelIndex &index) const override;
+
+	using t_Columns = std::vector<PgAttribute>;
+
+	std::shared_ptr<const PgDatabaseCatalog> m_catalog;
+	t_Columns m_columns;
+
+};
+
+#endif // COLUMNTABLEMODEL_H