Avoid passing QSqlDatabase by mutable reference

...otherwise someone would be able to replace the implicitly shared
instance behind it!

1 files changed, 2 insertions, 2 deletions

diff --git a/src/library/queryutil.h b/src/library/queryutil.h
index a0742ac83b..bcc10b8b98 100644
--- a/src/library/queryutil.h
+++ b/src/library/queryutil.h
@@ -10,7 +10,7 @@
 
 class ScopedTransaction {
   public:
-    explicit ScopedTransaction(QSqlDatabase& database) :
+    explicit ScopedTransaction(const QSqlDatabase& database) :
             m_database(database),
             m_active(false) {
         if (!transaction()) {
@@ -62,7 +62,7 @@ class ScopedTransaction {
         return result;
     }
   private:
-    QSqlDatabase& m_database;
+    QSqlDatabase m_database;
     bool m_active;
 };