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From Ishaaq Chandy <ish...@gmail.com>
Subject Re: Try to get qualifier collection
Date Tue, 07 Jul 2009 01:39:10 GMT

Hmm, I have a similar requirement. However, when looking at the API I cannot
see these classes: Get and Result. Are these 0.20.0 classes? If so, what
would be the equivalent for 0.19.3?

Thanks,
Ishaaq


Jonathan Gray-2 wrote:
> 
> Fleming,
> 
> Of course there is!
> 
> Look at some of the different methods in Result that return various Maps 
> in different format.  For your example, you might do:
> 
> =======
> 
> HTable table = new HTable("Table1");
> Get g = new Get(Bytes.toBytes("Key1"));
> Result r = table.get(g);
> 
> // Get a Map<qualifier,value> for Family
> 
> Map<byte[],byte[]> family = r.getFamilyMap(Bytes.toBytes("Family"));
> 
> // You can get a value knowing the qualifier
> 
> byte [] value1 = family.get(Bytes.toBytes("qualifier1"));
> 
> // Or you can just iterate all the qualifiers and values
> 
> for(Map.Entry<byte[],byte[]> entry : family.entrySet()) {
>    byte [] qualifier = entry.getKey();
>    byte [] value = entry.getValue();
> }
> 
> =======
> 
> All the maps that are returned by Result are NavigableMaps, so they are 
> sorted and allow a number of operations on them.
> 
> Hope that helps.
> 
> JG
> 
> y_823910@tsmc.com wrote:
>> Hi there,
>> 
>> I have a table "Table1" with one Family and 10 qualifier.
>> Any ways that I can get these qualifier's name in Table1,
>> then I can loop qualifier collection to fetch each qualifier's value.
>> Thank you
>> 
>> Fleming
>> 
>> ====================================================================================
>> 
>> HTable table = new HTable(config, "Table1");
>> Get g = new Get(Bytes.toBytes("Key1"));
>> Result r = table.get(g);
>> byte [] value1 = r.getValue(Bytes.toBytes("Family"),
>> Bytes.toBytes("qualifier1"));
>> String valueStr1 = Bytes.toString(value1);
>> byte [] value2 = r.getValue(Bytes.toBytes("Family"),
>> Bytes.toBytes("qualifier2"));
>> String valueStr2 = Bytes.toString(value2);
>>                       .
>>                       .
>>                       .
>> 
>> byte [] value10 = r.getValue(Bytes.toBytes("Family"),
>> Bytes.toBytes("qualifier10"));
>> String valueStr10 = Bytes.toString(value10);
>> 
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> 
> 

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