关于Android的ContentResolver的查询组通过

我测试SQL，它在SQLite的间谍工作正常：关于Android的ContentResolver的查询组通过

select ifnull(_name, _number) as identifer, count(_id) as amount from call group by identifer

而且我想在ContentConsolver使用它，但它也不能“按组”一起工作：

String[] projections = new String[] { "ifnull(name, number) as identifer", "count(_id) as amount" }; 
String group = "identifer"; 
//String selection = ") GROUP BY (" + group; 
Cursor cursor = getContentResolver().query(CallLog.Calls.CONTENT_URI, projections, null, null, null /*!group*/);

我该怎么办？

来源

2012-08-16 thecr0w

如果由'ContentResolver'查询的'ContentProvider'不与组由暴露的URI或支持了一些URI参数组的参数你将不得不做Java中的分组代码在读完'Cursor'的全部内容之后。 – Jens 2012-08-16 05:51:01

暂时解决，ICS出错！ add：String selection =“1 = 1）GROUP BY（identifer”; – thecr0w 2012-08-16 06:56:59

@ njzk2通过使用HashSet：Group By in ContentResolver in Ice Cream Sandwich做了诀窍，但如果你想要sum，它不会与count（）一起工作。我认为最好的解决方案是制作一个CallLog数据库的副本，然后你可以使用rawQuery（）或任何你想要的（也许这是浪费性能）。

private void refreshDbCache() 
{ 
    CallDbCache dbCache = new CallDbCache(this); 
    dbCache.clear(CallDbCache.TB_CALL); 

    String[] columns = new String[] { CallLog.Calls._ID, CallLog.Calls.NUMBER, CallLog.Calls.CACHED_NAME }; 
    Cursor cursor = getContentResolver().query(URI_CALL, columns, null, null, null); 
    while (cursor != null && cursor.moveToNext()) { 
     int id = cursor.getInt(cursor.getColumnIndex(CallLog.Calls._ID)); 
     String number = cursor.getString(cursor.getColumnIndex(CallLog.Calls.NUMBER)); 
     String name = cursor.getString(cursor.getColumnIndex(CallLog.Calls.CACHED_NAME)); 
     dbCache.insert(CallDbCache.TB_CALL, new LogData(id, number, name, "", "", "", "")); 
    } 
    cursor.close(); 

    dbCache.close(); 
}

来源

2012-08-20 07:36:44 thecr0w

关于Android的ContentResolver的查询组通过

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