Question

I use rawQuery method of a SQLiteDatabase object.

When I write

db.rawQuery(“select * from xxx order by ? desc;”, new String[] {“edit_time”});

it won’t order the result.

But when I write

db.rawQuery(“select * from xxx order by edit_time desc;”, null);

it orders.

I did something wrong?

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Thanks to sandis, I found I misread the document. There shouldn’t be the “;”. But removing the “;” doesn’t seem to affect anything.

Answer 1

As Jens said the first query:

db.rawQuery("select * from xxx order by ? desc;", new String[] {"edit_time"}); 

Becomes:

select * from xxx order by 'edit_time' desc

Since we are not concerned with SQL injections on column names, you should use:

db.rawQuery("select * from xxx order by edit_time desc", null);

The selectionArgs are intended to be used in this manner:

db.rawQuery("select * from xxx order by edit_time like ? desc", new String[] { "%" + orderBy + "%"});