rawquery（）问题

Question

我正在使用rawquery（）来执行内部连接，但这并没有给我任何错误并且无法正常工作，如果我直接使用此查询进入sqlite浏览器而不是这个工作但是在应用程序中此查询不起作用，是我的代码，对不起英语沟通不好

public void deleteFifo() {
    final String MY_QUERY1 = "Delete from Items where res_id in (select _id from Favourite where _id not in (select _id from Favourite order by date desc limit 50))";
    final String MY_QUERY2 = "Delete from Favourite where _id not in (select _id from Favourite order by date desc limit 50)";
    db.rawQuery(MY_QUERY1, null);
    db.rawQuery(MY_QUERY2, null);
}

Answer 1

尝试：

db.delete(TableName, whereCondition, null);

即。在你的情况下

db.delete("Items", "res_id in (select _id from Favourite where 
_id not in (select _id from Favourite order by date desc limit 50))", null);

和

db.delete("Favourite ","_id not in (select _id from Favourite 
order by date desc limit 50)");

希望它有所帮助!!