android-ORMLite中相同类型的多个ForeignCollection

概述我在android上使用OrmLite进行类似于以下结构的结构：Book类具有主要的BookArticle集合和次要的BookArticle集合：@DatabaseTable(tableName="BookV1",daoClass=BookDaoImplV1.class)publicclassBookimplementsIBook{@DatabaseField(id=true)privateSt

我在android上使用Ormlite进行类似于以下结构的结构：

Book类具有主要的BookArticle集合和次要的BookArticle集合：

    @Databasetable(tablename = "BookV1", daoClass = BookDaoImplV1.class)public class Book implements IBook {    @DatabaseFIEld(ID = true)    private String ID;    @ForeignCollectionFIEld(eager = false)    private ForeignCollection<BookArticle> primaryArticles;    @ForeignCollectionFIEld(eager = false)    private ForeignCollection<BookArticle> secondaryArticles;    // constructor getters setters etc...}

然后将BookArticle声明如下：

    @Databasetable(tablename = "BookArticleV1", daoClass = BookArticleDaoImplV1.class)public class BookArticle implements IBookArticle {    @DatabaseFIEld(ID = true)    private String ID;    @DatabaseFIEld    private String Title;    @DatabaseFIEld    private String summary;    // for ORM mapPing only    @DatabaseFIEld(foreign = true, foreignautoRefresh = true, columnname = BOOK_FIELDname, index = true)    private Book book;    // constructor getters setters etc..}

现在使用DAO保存BookArticles和Book可以很好地工作,但是当我想从数据库中获取Book实体并访问主要或次要文章(在refresh()之后)时,我遇到了问题,因为两个馆藏都保存了所有文章(主要和次要)二级),其“图书”列中包含该图书的ID.

显然,从数据库中获取时,我需要将这些主要文章和辅助文章分开.

我本来希望“ foreignFIEldname”是我的问题的答案.

@ForeignCollectionFIEld(eager = false, foreignFIEldname = "secondaryArticles")private ForeignCollection<BookArticle> secondaryArticles;

但显然,这种方式行不通.

有没有办法让我区分这两个系列？
也许使用简单的注释参数(例如“ owningFIEldname”或类似的参数)与BookArticle数据一起保留在DB中？

非常感谢您的帮助.

亚历克斯

解决方法:

我遇到了同样的问题.

这不是一个真正的解决方案,但是您可以尝试仅使用一个带有布尔值的列表来在主要/次要文章之间进行切换,如下所示：

@Databasetable(tablename = "BookV1", daoClass = BookDaoImplV1.class)public class Book implements IBook {    @DatabaseFIEld(ID = true)    private String ID;    @ForeignCollectionFIEld(eager = false)    private ForeignCollection<BookArticle> articles;    // constructor getters setters etc...}

然后是BookArticle类

@Databasetable(tablename = "BookArticleV1", daoClass = BookArticleDaoImplV1.class)public class BookArticle implements IBookArticle {    @DatabaseFIEld(ID = true)    private String ID;    @DatabaseFIEld    private String Title;    @DatabaseFIEld    private String summary;    @DatabaseFIEld    private boolean isSecondary;    // for ORM mapPing only    @DatabaseFIEld(foreign = true, foreignautoRefresh = true, columnname = BOOK_FIELDname, index = true)    private Book book;    // constructor getters setters etc..}

希望看到一个真正的答案

总结

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