Add in code that actually commits updated records.

src/db/sqlservicerecord.cpp

@@ -116,7 +116,15 @@ QVariantMap SqlServiceRecord::getRecord(int index)
 
 void SqlServiceRecord::updateRecord(int index, QString serviceProvider, QString dateISO, int miles, QString notes)
 {
-    //TODO
+    QSqlRecord record = this->record(index);
+    record.setValue("serviceprovider", serviceProvider);
+    record.setValue("servicedate", dateISO);
+    record.setValue("miles", miles);
+    record.setValue("notes", notes);
+    
+    this->setRecord(index, record);
+    this->database().commit();
+    this->select();
 }