// Add an folder
public void addWatchFolder(String folder, String notebook, boolean keep, int depth) {
if (exists(folder))
expungeWatchFolder(folder);
NSqlQuery query = new NSqlQuery(db.getConnection());
query.prepare("Insert Into WatchFolders (folder, notebook, keep, depth) " +
"values (:folder, :notebook, :keep, :depth)");
query.bindValue(":folder", folder);
query.bindValue(":notebook", notebook);
query.bindValue(":keep", keep);
query.bindValue(":depth", depth);