diff --git a/asyncdbconnection.cpp b/asyncdbconnection.cpp
index 0eb8b0a..dafaffc 100644
--- a/asyncdbconnection.cpp
+++ b/asyncdbconnection.cpp
@@ -223,7 +223,8 @@ void ASyncDBConnection::Thread::waitForAndSendCommand()
 {
 	WaitHandleList whl;
 	auto wait_result_new_command = whl.add(m_commandQueue.m_newEvent);
-	auto wait_result_stop = whl.add(m_stopEvent);
+	//auto wait_result_stop =
+	whl.add(m_stopEvent);
 
 	DWORD res = MsgWaitForMultipleObjectsEx(
 		whl.count(), // _In_       DWORD  nCount,
diff --git a/connectionlistmodel.cpp b/connectionlistmodel.cpp
index 6a0f087..cf85a07 100644
--- a/connectionlistmodel.cpp
+++ b/connectionlistmodel.cpp
@@ -158,7 +158,7 @@ Qt::ItemFlags ConnectionListModel::flags(const QModelIndex &index) const
 {
 	Qt::ItemFlags result;
 	int row = index.row();
-	if (row >= 0 && row < m_connections.size()) {
+	if (row >= 0 && row < (int)m_connections.size()) {
 		result = Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsEnabled;
 	}
 	return result;
@@ -189,7 +189,7 @@ void ConnectionListModel::add(const ConnectionConfig &cfg)
 
 Expected<ConnectionConfig> ConnectionListModel::get(int row)
 {
-	if (row >= 0 && row < m_connections.size()) {
+	if (row >= 0 && row < (int)m_connections.size()) {
 		return m_connections.at(row).m_config;
 	}
 	else {
@@ -201,7 +201,7 @@ Expected<ConnectionConfig> ConnectionListModel::get(int row)
 bool ConnectionListModel::removeRows(int row, int count, const QModelIndex &parent)
 {
 	bool result = false;
-	if (row >= 0 && row < m_connections.size()) {
+	if (row >= 0 && row < (int)m_connections.size()) {
 
 		beginRemoveRows(parent, row, row + count -1);
 		SCOPE_EXIT { endRemoveRows(); };
@@ -261,7 +261,7 @@ void ConnectionListModel::save()
 
 void ConnectionListModel::save(int index)
 {
-	if (index >= 0 && index < m_connections.size()) {
+	if (index >= 0 && index < (int)m_connections.size()) {
 		auto& e = m_connections[index];
 		if (e.m_dirty) {
 			QString file_name = iniFileName();
diff --git a/connectionmanagerwindow.cpp b/connectionmanagerwindow.cpp
index 451a17c..231febd 100644
--- a/connectionmanagerwindow.cpp
+++ b/connectionmanagerwindow.cpp
@@ -50,7 +50,7 @@ void ConnectionManagerWindow::on_actionAdd_Connection_triggered()
 }
 
 void ConnectionManagerWindow::on_currentChanged(const QModelIndex &current,
-										const QModelIndex &previous)
+										const QModelIndex &)
 {
 	int currow = current.row();
 	auto clm = m_masterController->getConnectionListModel();
diff --git a/opendatabase.cpp b/opendatabase.cpp
index 06934d0..c86005a 100644
--- a/opendatabase.cpp
+++ b/opendatabase.cpp
@@ -6,8 +6,9 @@ Expected<OpenDatabase*> OpenDatabase::createOpenDatabase(const ConnectionConfig
 	OpenDatabase *odb = new OpenDatabase(cfg, nullptr);
 	if (odb->Init()) {
 
-		return odb;
+
 	}
+	return odb;
 	//return Expected<ConnectionConfig>::fromException(std::out_of_range("Invalid row"));
 }
 
diff --git a/queryexplainmodel.cpp b/queryexplainmodel.cpp
index a1c1552..5e0a27d 100644
--- a/queryexplainmodel.cpp
+++ b/queryexplainmodel.cpp
@@ -206,7 +206,7 @@ int QueryExplainModel::rowCount(const QModelIndex &parent) const
 	return result;
 }
 
-int QueryExplainModel::columnCount(const QModelIndex &parent) const
+int QueryExplainModel::columnCount(const QModelIndex &) const
 {
 //	if (parent.isValid()) {
 //		return 6;//static_cast<ExplainTreeModelItem*>(parent.internalPointer())->columnCount();
diff --git a/queryexplainmodel.h b/queryexplainmodel.h
index 913ce3d..721c608 100644
--- a/queryexplainmodel.h
+++ b/queryexplainmodel.h
@@ -4,6 +4,8 @@
 #include <string>
 #include "explaintreemodelitem.h"
 
+/** \brief Model class for displaying the explain of a query in a tree like format.
+ */
 class QueryExplainModel : public QAbstractItemModel
 {
 	Q_OBJECT