Question

我知道我已经问过这个问题了，但我还有误解。我之前的问题： Liferay and relationships in it

用两个词说：我有一个portlet，可以添加/更新/删除书籍和添加作者。此外，您可以在尝试添加图书时选择现有作者。

http://i.stack.imgur.com/vzUjn.png

现在我需要展示每位作者在＆＃34;作者＆＃34;表

我的service.xml：

<entity name="Book" local-service="true" remote-service="true"  cache-enabled="false">

    <column name="bookId" type="long" primary="true" />
    <column name="bookName" type="String" />
    <column name="bookDescription" type="String" />
    <column name="authors" type="Collection" entity="Author" mapping-table="Books_Authors" />
    <finder return-type="Collection" name="bookName">
        <finder-column name="bookName"></finder-column>
    </finder>

</entity>

<entity name="Author" local-service="true" remote-service="true" cache-enabled="false">
    <column name="authorId" type="long" primary="true" />
    <column name="authorName" type="String" />
    <column name="books" type="Collection" entity="Book" mapping-table="Books_Authors" />

</entity>

为实现目标，我应该创建什么样的发现者？如果我创建bookName finder，我可以计算我有多少本书。如果我创建authorName finder，我可以计算我有多少作者。我有点失落。

感谢您的帮助，但我仍然有一些问题：

authorName如何以及在哪里获得authorId？

如何在count的表格中使用我的view.jsp变量？

long count = BookLocalServiceUtil.countByAuthor(authorId);

    public void addBook(ActionRequest actionRequest, ActionResponse actionResponse) 
        throws IOException, PortletException {

        String bookName = ParamUtil.getString(actionRequest,"bookName");
        String bookDescription = ParamUtil.getString(actionRequest, "bookDescription");
        Long authorId = ParamUtil.getLong(actionRequest, "author");
        try {
        Book book = BookLocalServiceUtil.createBook(CounterLocalServiceUtil.increment());
        book.setBookName(bookName);
        book.setBookDescription(bookDescription);
        book.setAuthorId(authorId);
        book=BookLocalServiceUtil.addBook(book);
        String author = ParamUtil.getString(actionRequest, "authorId");

    } catch (Exception e) {
        log.info(ADD_BOOK_ERROR, e);
        SessionErrors.add(actionRequest, "PortalExceptionError");   
    }
}

Answer 1

如果您的Book只能有一个Author（多对一），那么以下实体结构将适用于您：

service.xml的的

<entity name="Book" local-service="true" remote-service="true" cache-enabled="false">
    <column name="bookId" type="long" primary="true"></column>
    <column name="bookName" type="String"></column>
    <column name="bookDescription" type="String"></column>
    <column name="authorId" type="long"></column>

    <finder return-type="Collection" name="Author">
        <finder-column name="authorId"></finder-column>
    </finder>
</entity>
<entity name="Author" local-service="true" remote-service="true" cache-enabled="false">
    <column name="authorId" type="long" primary="true"></column>
    <column name="authorName" type="String"></column>
</entity>

成功构建后，上方查找器将在findByAuthor(long authorId)中生成两个方法countByAuthor(long authorId)和BookUtil。然后，您可以在BookLocalServiceImpl中实现这些方法，如下所示：

BookLocalServiceImpl：

public List<Book> findByAuthor(long authorId) {
    try {
        return BookUtil.findByAuthor(authorId);
    } catch (Exception ex) {}

    return null;
}

public int countByAuthor(long authorId) {
    try {
        return BookUtil.countByAuthor(authorId);
    } catch (Exception ex) {}

    return 0;
}

再次构建服务时，您可以在操作类和BookLocalServiceUtil的视图中使用这些方法。

此外，您在视图上使用JSTL，需要在liferay-plugin-package.properties中添加jar的依赖关系，如下所示：

liferay-plugin-package.properties：

portal-dependency-jars=\
    jstl-api.jar,\
    jstl-impl.jar

您的问题：

authorName如何以及在哪里获得authorId？

<liferay-ui:search-container>
    <liferay-ui:search-container-results results="${bookListArray}" />
    <liferay-ui:search-container-row className="builder.model.Book"
        keyProperty="bookId" modelVar="aBook">
        <liferay-ui:search-container-column-text property="bookName"
            name="book-Name" />
        <liferay-ui:search-container-column-text property="bookDescription"
            name="description" />
        <%
            Author bookAuthor = AuthorLocalServiceUtil.getAuthor(aBook.getAuthorId());
        %>
        <liferay-ui:search-container-column-text name="Author"
            value="<%=bookAuthor.getAuthorName()  %>" />
        <liferay-ui:search-container-column-jsp path="/html/actionBook.jsp" />
    </liferay-ui:search-container-row>
    <liferay-ui:search-iterator />
</liferay-ui:search-container>

如何在view.jsp？
的表格中使用我的计数变量

<liferay-ui:search-container>
    <liferay-ui:search-container-results results="${authorListArray}" />
    <liferay-ui:search-container-row className="builder.model.Author"
        keyProperty="authorId" modelVar="aAuthor">
        <liferay-ui:search-container-column-text property="authorName"
            name="author-Name" />
        <%
            int count = BookLocalServiceUtil.countByAuthor(aAuthor.getAuthorId());
        %>
        <liferay-ui:search-container-column-text name="count"
            value="<%=String.valueOf(count)  %>" />
        <liferay-ui:search-container-column-jsp path="/html/actionAuthor.jsp" />
    </liferay-ui:search-container-row>
    <liferay-ui:search-iterator />
</liferay-ui:search-container>

Liferay的ServiceBuilder中的Finder

1 个答案: