st.setInt(2, rowsPerPage);
st.setInt(3, pageNum);
st.setInt(4, rowsPerPage);
ResultSet r = st.executeQuery();
while (r.next()) {
l.add(new LogUsuario(r.getInt(2), new Operacao(0, r.getString(3),r.getString(6)),
new Usuario("", "", r.getString(4), null), r.getTimestamp(5)));
}
st = conn.prepareStatement("select ((count(*) - 1) / ? ) + 1 from logusuario");
st.setInt(1, rowsPerPage);
ResultSet t = st.executeQuery();