jstl에서 sql 사용

<sql:query var="rs_site" dataSource="jdbc/postgres">
	select site_id from esm_site_agent group by site_id order by site_id
</sql:query>
<ul id="browser">
	<c:forEach var="rows_site" items="${rs_site.rows}">
		<li><span class="folder">${rows_site.site_id}</span>
  
			<sql:query var="rs_agent" dataSource="jdbc/postgres">
				select agent_id from esm_site_agent where site_id=?
				<sql:param>${rows_site.site_id}</sql:param>
			</sql:query>
			<ul>
				<c:forEach var="rows_agent" items="${rs_agent.rows}">
					<li><span class="file">${rows_agent.agent_id}</span></li>
				</c:forEach>
			</ul>
		</li>
	</c:forEach>
</ul>