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From Jonathan Gray <jl...@streamy.com>
Subject Re: Try to get qualifier collection
Date Tue, 07 Jul 2009 02:25:08 GMT
These are 0.20.0 classes.

The 0.19 API and earlier provided a very different view of the data.

Check out RowResult, which contained a Map<byte[],Cell>.

Ishaaq Chandy wrote:
> 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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