--- a/SqliteDBLink.cpp	Sat Feb 15 13:32:46 2014 +0100
+++ b/SqliteDBLink.cpp	Sat Feb 15 13:34:10 2014 +0100
@@ -340,12 +340,15 @@
 }
 
 
-bool SqliteDBLink::commit(const QString& prefix)
+bool SqliteDBLink::commit(const QString& prefix, bool dirty)
 {
   OperationType last = None;
   QVariantList paths, sizes, mtimes, hashes;
 
-  foreach(const Operation* operation, operations) {
+  const Operation* operation =
+    (operations.empty()) ? NULL : operations.takeFirst();
+
+  while (operation) {
     if (operation->type() != last) {
       executeOperation(paths, sizes, mtimes, hashes, last);
     }
@@ -358,6 +361,7 @@
       sizes.push_back(iOperation->info().size());
       mtimes.push_back(iOperation->info().mtime());
       hashes.push_back(iOperation->info().checksum());
+      dirty = true;
       break;
     }
     case Delete: {
@@ -368,58 +372,66 @@
       break;
     }
     last = operation->type();
+    delete operation;
+    operation = (operations.empty()) ? NULL : operations.takeFirst();
   }
   if (last != None) {
     qDebug() << "Execute Operation" << typeString(last);
-    qDebug() << paths;
+    foreach(QVariant path, paths) {
+      qDebug() << path.toString();
+    }
     executeOperation(paths, sizes, mtimes, hashes, last);
     qDebug() << "Execute Operation Done";
   }
 
-  QSqlQuery whatToUpdate(db);
-  QString whatToUpdateQuery =
-    "SELECT path FROM files WHERE checksum is NULL AND path in "
-    "(SELECT path FROM files WHERE size <> 0 %1 "
-    "GROUP BY size HAVING count(*) > 1) ORDER BY size";
-  if (prefix.isEmpty()) {
-    whatToUpdateQuery = whatToUpdateQuery.arg("");
-  }
-  else {
-    whatToUpdateQuery = whatToUpdateQuery.arg("AND path LIKE :prefix");
-  }
-  whatToUpdate.prepare(whatToUpdateQuery);
-  if (!prefix.isEmpty()) {
-    whatToUpdate.bindValue("prefix", QString("%1%").arg(prefix));
-  }
-
-  qDebug() << "Before whatToUpdate";
-  if (!whatToUpdate.exec()) {
-    throw SQLException(whatToUpdate);
-  }
-  qDebug() << "After whatToUpdate";
+  if (dirty) {
+    QSqlQuery whatToUpdate(db);
+    QString whatToUpdateQuery =
+      "SELECT path FROM files WHERE checksum is NULL %1 AND size in "
+      "(SELECT size FROM files WHERE size <> 0 %2 "
+      "GROUP BY size HAVING count(*) > 1) ORDER BY size";
+    if (prefix.isEmpty()) {
+      whatToUpdateQuery = whatToUpdateQuery.arg("");
+    }
+    else {
+      whatToUpdateQuery = whatToUpdateQuery.arg("AND path LIKE :prefix1");
+      whatToUpdateQuery = whatToUpdateQuery.arg("AND path LIKE :prefix2");
+    }
+    whatToUpdate.prepare(whatToUpdateQuery);
+    if (!prefix.isEmpty()) {
+      whatToUpdate.bindValue("prefix1", QString("%1%").arg(prefix));
+      whatToUpdate.bindValue("prefix2", QString("%1%").arg(prefix));
+    }
 
-  int pathIndex = whatToUpdate.record().indexOf("path");
-  QStringList updatePaths;
-  while (whatToUpdate.next()) {
-    updatePaths << whatToUpdate.value(pathIndex).toString();
-  }
-  int n = 0;
-  int max = updatePaths.size();
-  emit progressUpdate(0, max);
-  QSqlQuery updateChecksum(db);
-  updateChecksum.prepare("UPDATE files "
-			 "SET checksum=:checksum "
-			 "WHERE path=:path");
+    qDebug() << "Before whatToUpdate";
+    if (!whatToUpdate.exec()) {
+      throw SQLException(whatToUpdate);
+    }
+    qDebug() << "After whatToUpdate";
 
-  foreach (const QString& path, updatePaths) {
-    qDebug() << path;
-    QByteArray ohash = computeHash(path);
-    emit progressUpdate(++n, max);
-    updateChecksum.bindValue("checksum", ohash);
-    updateChecksum.bindValue("path", path);
-    if (!updateChecksum.exec())
-      throw SQLException(updateChecksum);
+    int pathIndex = whatToUpdate.record().indexOf("path");
+    QStringList updatePaths;
+    while (whatToUpdate.next()) {
+      updatePaths << whatToUpdate.value(pathIndex).toString();
+    }
+    int n = 0;
+    int max = updatePaths.size();
+    emit progressUpdate(0, max);
+    QSqlQuery updateChecksum(db);
+    updateChecksum.prepare("UPDATE files "
+			   "SET checksum=:checksum "
+			   "WHERE path=:path");
 
+    foreach (const QString& path, updatePaths) {
+      qDebug() << path;
+      QByteArray ohash = computeHash(path);
+      emit progressUpdate(++n, max);
+      updateChecksum.bindValue("checksum", ohash);
+      updateChecksum.bindValue("path", path);
+      if (!updateChecksum.exec())
+	throw SQLException(updateChecksum);
+
+    }
   }
   return true;
 }