4 files changed, 8 insertions, 8 deletions
diff --git a/src/sql/models/qsqlrelationaltablemodel.cpp b/src/sql/models/qsqlrelationaltablemodel.cpp
index 20adec6a3b..4f5f00bf96 100644
--- a/src/sql/models/qsqlrelationaltablemodel.cpp
+++ b/src/sql/models/qsqlrelationaltablemodel.cpp
@@ -161,7 +161,7 @@ struct QRelation
 class QRelatedTableModel : public QSqlTableModel
 {
 public:
-    QRelatedTableModel(QRelation *rel, QObject *parent = nullptr, QSqlDatabase db = QSqlDatabase());
+    QRelatedTableModel(QRelation *rel, QObject *parent = nullptr, const QSqlDatabase &db = QSqlDatabase());
     bool select() override;
 private:
     bool firstSelect;
@@ -245,7 +245,7 @@ bool QRelation::isValid()
 
 
 
-QRelatedTableModel::QRelatedTableModel(QRelation *rel, QObject *parent, QSqlDatabase db) :
+QRelatedTableModel::QRelatedTableModel(QRelation *rel, QObject *parent, const QSqlDatabase &db) :
     QSqlTableModel(parent, db), firstSelect(true), relation(rel)
 {
 }
@@ -410,7 +410,7 @@ void QSqlRelationalTableModelPrivate::clearCache()
     and the database connection to \a db. If \a db is not valid, the
     default database connection will be used.
 */
-QSqlRelationalTableModel::QSqlRelationalTableModel(QObject *parent, QSqlDatabase db)
+QSqlRelationalTableModel::QSqlRelationalTableModel(QObject *parent, const QSqlDatabase &db)
     : QSqlTableModel(*new QSqlRelationalTableModelPrivate, parent, db)
 {
 }
diff --git a/src/sql/models/qsqlrelationaltablemodel.h b/src/sql/models/qsqlrelationaltablemodel.h
index 1929bd320a..2ebadaabd1 100644
--- a/src/sql/models/qsqlrelationaltablemodel.h
+++ b/src/sql/models/qsqlrelationaltablemodel.h
@@ -91,7 +91,7 @@ public:
     };
 
     explicit QSqlRelationalTableModel(QObject *parent = nullptr,
-                                      QSqlDatabase db = QSqlDatabase());
+                                      const QSqlDatabase &db = QSqlDatabase());
     virtual ~QSqlRelationalTableModel();
 
     QVariant data(const QModelIndex &item, int role = Qt::DisplayRole) const override;
diff --git a/src/sql/models/qsqltablemodel.cpp b/src/sql/models/qsqltablemodel.cpp
index 7d2421d34e..941735767d 100644
--- a/src/sql/models/qsqltablemodel.cpp
+++ b/src/sql/models/qsqltablemodel.cpp
@@ -291,7 +291,7 @@ bool QSqlTableModelPrivate::exec(const QString &stmt, bool prepStatement,
 
     The default edit strategy is \l OnRowChange.
 */
-QSqlTableModel::QSqlTableModel(QObject *parent, QSqlDatabase db)
+QSqlTableModel::QSqlTableModel(QObject *parent, const QSqlDatabase &db)
     : QSqlQueryModel(*new QSqlTableModelPrivate, parent)
 {
     Q_D(QSqlTableModel);
@@ -300,7 +300,7 @@ QSqlTableModel::QSqlTableModel(QObject *parent, QSqlDatabase db)
 
 /*!  \internal
 */
-QSqlTableModel::QSqlTableModel(QSqlTableModelPrivate &dd, QObject *parent, QSqlDatabase db)
+QSqlTableModel::QSqlTableModel(QSqlTableModelPrivate &dd, QObject *parent, const QSqlDatabase &db)
     : QSqlQueryModel(dd, parent)
 {
     Q_D(QSqlTableModel);
diff --git a/src/sql/models/qsqltablemodel.h b/src/sql/models/qsqltablemodel.h
index eba27e60ec..1ac8bd9b04 100644
--- a/src/sql/models/qsqltablemodel.h
+++ b/src/sql/models/qsqltablemodel.h
@@ -62,7 +62,7 @@ class Q_SQL_EXPORT QSqlTableModel: public QSqlQueryModel
 public:
     enum EditStrategy {OnFieldChange, OnRowChange, OnManualSubmit};
 
-    explicit QSqlTableModel(QObject *parent = nullptr, QSqlDatabase db = QSqlDatabase());
+    explicit QSqlTableModel(QObject *parent = nullptr, const QSqlDatabase &db = QSqlDatabase());
     virtual ~QSqlTableModel();
 
     virtual void setTable(const QString &tableName);
@@ -127,7 +127,7 @@ Q_SIGNALS:
     void beforeDelete(int row);
 
 protected:
-    QSqlTableModel(QSqlTableModelPrivate &dd, QObject *parent = nullptr, QSqlDatabase db = QSqlDatabase());
+    QSqlTableModel(QSqlTableModelPrivate &dd, QObject *parent = nullptr, const QSqlDatabase &db = QSqlDatabase());
 
     virtual bool updateRowInTable(int row, const QSqlRecord &values);
     virtual bool insertRowIntoTable(const QSqlRecord &values);