android-ORMLite中相同类型的多个ForeignCollection

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

标签：sqlite,ormlite,android
来源： https://codeday.me/bug/20191029/1961066.html