android - CursorLoader - 两个表连接查询？

Question

我有两个 1:1 关系的表，我正在使用内容提供程序和游标加载器。

我将如何进行连接查询以使用游标加载器？我可以在内容提供程序中使用 rawSql 以某种方式破解它，但我无法在游标加载器构造函数中进行操作。

非常感谢!

private static final String CREATE_TABLE_ARTICLES = "create table "
            + TABLE_ARTICLES + "("
            + COLUMN_ARTICLE_ID + " integer primary key autoincrement, "
            + COLUMN_URL + " text not null unique, "
            + COLUMN_TITLE + " text not null, "
            + COLUMN_PRICE + " text not null, "
            + COLUMN_ADDED + " text not null, "
            + COLUMN_IMG_URL + " text);";

    private static final String CREATE_TABLE_ARTICLE_DETAIL = "create table "
            + TABLE_ARTICLE_DETAILS + "("
            + COLUMN_ARTICLE_DETAIL_ID + " integer primary key autoincrement, "
            + COLUMN_DESC + " text not null, "
            + COLUMN_LOCALITY + " text, "
            + COLUMN_TYPE + " text not null, "
            + COLUMN_SELLER + " text not null, "
            + COLUMN_SELLER_PHONE + " text, "
            + COLUMN_IMAGE_COUNT + " integer default 0, "
            + COLUMN_ARTICLE + " integer, foreign key (" + COLUMN_ARTICLE + ") references " + TABLE_ARTICLES + "(" + COLUMN_ARTICLE_ID + "));";

Answer 1

实际上，您不必使用自定义任务加载器。简而言之，一种解决方案是创建 Uri“content://AUTHORITY/TableArticlesWithDetail”。然后在您的内容提供程序中，检查该 Uri 并执行原始 SQL 来执行连接。

参见 how to use join query in CursorLoader when its constructor does not support it了解详情。