lundi 27 juillet 2015

Query in DynamoDB using Java API

I need to implement a Query operation on DynamoDB. Right now I'm doing it by giving the HashKey and then filtering out the results according to my conditions on non-key attributes.

This is what I'm doing :

MusicData hashKey = new MusicData();
hashKey.setID(singer); 

DynamoDBQueryExpression<MusicData> queryExpression = new DynamoDBQueryExpression<MusicData>().withHashKeyValues(hashKey);

List<MusicData> queryResult = mapper.query(MusicData.class, queryExpression);

for (MusicData musicData : queryResult) {
    if( my condtions ) {
        do something;   
    }
}

What I'm trying to do is to be able to do something like this :

MusicData hashKey = new MusicData();
hashKey.setID(singer); 
hashKey.setAlbum(sampleAlbum);
hashKey.setSinger(duration);

DynamoDBQueryExpression<MusicData> queryExpression = new DynamoDBQueryExpression<MusicData>().withHashKeyValues(hashKey);

List<MusicData> queryResult = mapper.query(MusicData.class, queryExpression);

for (MusicData musicData : queryResult) {
    if( my condtions ) {
        do something;   
    }
}

And get results already filtered out. Is there a way to do this in DynamoDB?




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