這裡的ProjectionMap必須是一個hashmap,更重要的是：
If a projection map is set it must contain all column names the user may request, even if the key and value are the same.
orz...
另外ProjectionMap.put("user_id", UserTableMetaData._ID); 鍵為别名，值為原列名
這裡的ProjectionMap必須是一個hashmap,更重要的是：
If a projection map is set it must contain all column names the user may request, even if the key and value are the same.
orz...
另外ProjectionMap.put("user_id", UserTableMetaData._ID); 鍵為别名，值為原列名
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