Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
403 views
in Technique[技术] by (71.8m points)

android - Specifying limit / offset for ContentProvider queries

I'm trying to get my ContentResolver to run this query:

select * from myTable limit 1 offset 2

The only query method in ContentResolver is:

resolver.query(uri, projection, selection, selectionArgs, sortOrder);

I've tried:

final Cursor c = resolver.query(
        MyTable.CONTENT_URI,
        MyTable.PROJECTION,
        " ? ?",
        new String[] {"1", "2"},
        null);

Which just throws an IllegaLArgumentException. What is the correct way of achieving this?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

I put the limit clause as a query parameter using the syntax 'limit = offset, limit':

Cursor c = context.getContentResolver().query(
        MyTable.CONTENT_URI.buildUpon().encodedQuery("limit="+offset+","+limit).build(),
        MyTable.PROJECTION,
        null,
        null,
        null);

It works at least with MediaStore uris. Be careful of not encoding the "," or it won't work.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...