我使用在rowkey複合數據類型,列族是如下獲取卡桑德拉
create column family CompositeTest
with comparator = 'UTF8Type'
and key_validation_class = 'CompositeType(UTF8Type,UTF8Type)'
and default_validation_class = 'UTF8Type';
此列家族如下面所述的樣品數據,
RowKey: s2:2222222
=> (column=param1, value=value1
=> (column=param2, value=value2
=> (column=param3, value=value3
-------------------
RowKey: s2:3333333
=> (column=param1, value=value1
=> (column=param2, value=value2
=> (column=param3, value=value3
-------------------
RowKey: s2:1111111
=> (column=param1, value=value1
=> (column=param2, value=value2
=> (column=param3, value=value3
-------------------
RowKey: s1:3333333
=> (column=param1, value=value1
=> (column=param2, value=value2
=> (column=param3, value=value3
-------------------
RowKey: s1:2222222
=> (column=param1, value=value1
=> (column=param2, value=value2
=> (column=param3, value=value3
-------------------
RowKey: s1:1111111
=> (column=param1, value=value1
=> (column=param2, value=value2
=> (column=param3, value=value3
我想獲得行密鑰的第一個組件是「s1」的所有行。是否有可能使用Hector客戶端?如果不是,那麼cassandra客戶端可能是哪個?
我用下面的代碼試過,但其沒有工作,
Composite start = new Composite();
start.addComponent(0, "s1", ComponentEquality.EQUAL);
Composite end = new Composite();
end.addComponent(0, "s1", ComponentEquality.GREATER_THAN_EQUAL);
RangeSlicesQuery<Composite, String, String> rangeSlicesQuery = HFactory.createRangeSlicesQuery(keyspace, new CompositeSerializer(), StringSerializer.get(), StringSerializer.get());
rangeSlicesQuery.setKeys(start, end);
rangeSlicesQuery.setRange("param1", "param3", false, 100);
rangeSlicesQuery.setColumnFamily("CompositeTest");
rangeSlicesQuery.setRowCount(11);
QueryResult<OrderedRows<Composite, String, String>> queryResult = rangeSlicesQuery.execute();
Rows<Composite, String, String> rows = queryResult.get();
Iterator<Row<Composite, String, String>> rowsIterator = rows.iterator();
在此先感謝...
Hector客戶端和Astyanax客戶端都可以這樣做。 –
如果可能,那麼請你分享我如何使用Hector來做到這一點? –