jdbc.setUserName("user");
jdbc.setPassword("secret");
jdbc.setQuery("select");
jdbc.addColumn(new Column("id", "ID", null, null));
jdbc.addColumn(new Column("name", "NAME", null, null));
jdbc.addColumn(new Column("email", "EMAIL", null, null));
((ConfigurationImpl) config).addDataSource(0, jdbc);
// --- write and reload
File outfile = tmpdir.newFile("config.xml");
ConfigWriter.write(config, outfile.getAbsolutePath());