Re: Try to get qualifier collection

[Jonathan Gray]

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_823...@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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