mirror of https://github.com/apache/openjpa.git
140 lines
4.7 KiB
Plaintext
140 lines
4.7 KiB
Plaintext
<%--
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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--%>
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<%-- ==================================================================== --%>
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<%-- Executes a query which is determined by the request parameter. --%>
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<%-- Displays the results --%>
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<%-- ==================================================================== --%>
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<%@include file="header.jsp"%>
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<%@page import="openbook.server.OpenBookService"%>
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<%@page import="openbook.domain.Book"%>
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<%@page import="openbook.domain.Author"%>
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<%@page import="openbook.util.JSPUtility"%>
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<%@page import="java.util.List"%>
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<div id="help">
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<h3>Query Result</h3>
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This page is displaying the result of the Criteria query specified in the previous Search page.
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<ul>
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<li><B>Readability</B>: Criteria query is more powerful than JPQL but hardly as readable.
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JPA specification says nothing about how a Criteria Query should be displayed.
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OpenJPA implementation provides a simple
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<a HREF="generated-html/openbook/server/OpenBookServiceImpl.java.html#getQuery" type="popup">
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<code>toString()</code></a> method to display a Criteria query as a string that is quite
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<em>similar</em> to an equivalent JPQL string. <em>Similar</em> because Criteria query can
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express certain queries that has no equivalent JPQL counterpart.
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</li>
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<li><B>Eager Fetching</B>: The query result displays the Author names as well, though the query
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had only selected the Books. But the Authors have also been fetched because
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many-to-many <a href="generated-html/openbook/domain/Book.java.html#authors" type="popup">
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Book-Author relationship</a> is annotated to be <em>eagerly fetched</em>.
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</li>
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</ul>
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</div>
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<div id="content" style="width: 600px; display: block">
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<%!
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/**
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* Concatenates the names of the given list of Authors.
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*
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*/
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public static String namesOf(List<Author> authors) {
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StringBuilder names = new StringBuilder();
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if (authors == null)
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return names.toString();
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for (Author a : authors) {
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if (names.length() != 0) names.append(", ");
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names.append(a.getName());
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}
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return names.toString();
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}
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%>
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<%
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OpenBookService service = (OpenBookService)session.getAttribute(KEY_SERVICE);
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if (service == null) {
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%>
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<jsp:forward page="<%= PAGE_HOME %>"></jsp:forward>
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<%
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}
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%>
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<%
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String title = request.getParameter(FORM_TITLE);
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Double minPrice = JSPUtility.toDouble(request.getParameter(FORM_PRICE_MIN));
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Double maxPrice = JSPUtility.toDouble(request.getParameter(FORM_PRICE_MAX));
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String author = request.getParameter(FORM_AUTHOR);
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List<Book> books = service.select(title, minPrice, maxPrice, author);
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String query = service.getQuery(title, minPrice, maxPrice, author);
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%>
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Query : <code><%= query %></code>
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<p></p>
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<%
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if (books.isEmpty()) {
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%>
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did not select any book.
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<p><A HREF="<%= PAGE_SEARCH %>">Search again</A></p>
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<%
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return;
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}
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%>
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<br>
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<table>
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<caption>Selected <%= books.size() %> Book<%= books.size() == 1 ? "" : "s" %></caption>
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<thead>
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<tr>
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<th width="08em">ISBN</th>
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<th width="10em">Title</th>
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<th width="06em">Price</th>
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<th width="20em">Authors</th>
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<th width="16em">Add to Cart</th>
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</tr>
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</thead>
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<tfoot>
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</tfoot>
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<tbody>
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<%
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int i = 0;
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for (Book book : books) {
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session.setAttribute(book.getISBN(), book);
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%>
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<TR class="<%= i++%2 == 0 ? ROW_STYLE_EVEN : ROW_STYLE_ODD %>">
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<TD> <%= book.getISBN() %> </TD>
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<TD> <%= book.getTitle() %> </TD>
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<TD> <%= JSPUtility.format(book.getPrice()) %> </TD>
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<TD> <%= namesOf(book.getAuthors()) %> </TD>
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<TD> <A HREF="<%= JSPUtility.encodeURL(PAGE_CART,
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KEY_ACTION, ACTION_ADD, KEY_ISBN, book.getISBN()) %>">
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<img src="images/add-to-cart.gif" width="106px" height="22px" border="0"></A></TD>
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</TR>
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<%
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}
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%>
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</tbody>
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</table>
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<p>
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</div>
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<%@include file="footer.jsp"%>
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