DbViewer: can launch with a directory argument to set current workspace for convenience.

guilib/src/DatabaseViewer.cpp

@@ -689,6 +689,8 @@ bool DatabaseViewer::openDatabase(const QString & path)
 {
 	UDEBUG("Open database \"%s\"", path.toStdString().c_str());
 	if(QFile::exists(path))
+	{
+		if(QFileInfo(path).isFile())
 		{
 			std::string driverType = "sqlite3";
 
@@ -777,6 +779,16 @@ bool DatabaseViewer::openDatabase(const QString & path)
 				return true;
 			}
 		}
+		else // directory
+		{
+			pathDatabase_ = path;
+			if(pathDatabase_.isEmpty() || pathDatabase_.compare(".") == 0)
+			{
+				pathDatabase_ = QDir::currentPath();
+			}
+			ui_->graphViewer->setWorkingDirectory(pathDatabase_);
+		}
+	}
 	else
 	{
 		QMessageBox::warning(this, "Database error", tr("Database \"%1\" does not exist.").arg(path));