3 files changed, 8 insertions, 5 deletions
diff --git a/examples/sql/querymodel/customsqlmodel.h b/examples/sql/querymodel/customsqlmodel.h
index 5d2f625665..462d2ab822 100644
--- a/examples/sql/querymodel/customsqlmodel.h
+++ b/examples/sql/querymodel/customsqlmodel.h
@@ -59,7 +59,7 @@ class CustomSqlModel : public QSqlQueryModel
     Q_OBJECT
 
 public:
-    CustomSqlModel(QObject *parent = 0);
+    CustomSqlModel(QObject *parent = nullptr);
 
     QVariant data(const QModelIndex &item, int role) const override;
 };
diff --git a/examples/sql/querymodel/editablesqlmodel.h b/examples/sql/querymodel/editablesqlmodel.h
index 1341dd372a..e8caad2765 100644
--- a/examples/sql/querymodel/editablesqlmodel.h
+++ b/examples/sql/querymodel/editablesqlmodel.h
@@ -58,7 +58,7 @@ class EditableSqlModel : public QSqlQueryModel
     Q_OBJECT
 
 public:
-    EditableSqlModel(QObject *parent = 0);
+    EditableSqlModel(QObject *parent = nullptr);
 
     Qt::ItemFlags flags(const QModelIndex &index) const override;
     bool setData(const QModelIndex &index, const QVariant &value, int role) override;
diff --git a/examples/sql/querymodel/main.cpp b/examples/sql/querymodel/main.cpp
index 83804682f9..da19939dd8 100644
--- a/examples/sql/querymodel/main.cpp
+++ b/examples/sql/querymodel/main.cpp
@@ -48,12 +48,15 @@
 **
 ****************************************************************************/
 
-#include <QtWidgets>
-
 #include "../connection.h"
 #include "customsqlmodel.h"
 #include "editablesqlmodel.h"
 
+#include <QApplication>
+#include <QTableView>
+
+#include <stdlib.h>
+
 void initializeModel(QSqlQueryModel *model)
 {
     model->setQuery("select * from person");
@@ -80,7 +83,7 @@ int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     if (!createConnection())
-        return 1;
+        return EXIT_FAILURE;
 
     QSqlQueryModel plainModel;
     EditableSqlModel editableModel;