Add new method for updating songs based on song ID

Show status updating database.

Fixes #750

src/core/scopedtransaction.cpp

@@ -25,19 +25,23 @@
 #include "core/logging.h"
 #include "scopedtransaction.h"
 
-ScopedTransaction::ScopedTransaction(QSqlDatabase *db)
-    : db_(db), pending_(true) {
+ScopedTransaction::ScopedTransaction(QSqlDatabase *db) : db_(db), pending_(true) {
+
   db->transaction();
+
 }
 
 ScopedTransaction::~ScopedTransaction() {
+
   if (pending_) {
     qLog(Warning) << "Rolling back transaction";
     db_->rollback();
   }
+
 }
 
 void ScopedTransaction::Commit() {
+
   if (!pending_) {
     qLog(Warning) << "Tried to commit a ScopedTransaction twice";
     return;
@@ -45,4 +49,5 @@ void ScopedTransaction::Commit() {
 
   db_->commit();
   pending_ = false;
+
 }