jstl的sql标签如何工作？

<sql:query dataSource="jdbc:mysql://localhost:3306/sales" query="SELECT * FROM customers WHERE status = 'ACTIVE' ORDER BY name ASC" var="result">
  <sql:param value="getActiveCustomers" />
</sql:query>
<c:forEach items="${result.rows}" var="row">
  <tr>
    <td><c:out value="${row.id}" /></td>
    <td><c:out value="${row.name}" /></td>
    <td><c:out value="${row.email}" /></td>
    <td><c:out value="${row.phone}" /></td>
  </tr>
</c:forEach>