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From "Markus Wiesenbacher | Codefreun.de" ...@codefreun.de>
Subject Re: getFieldValue()
Date Fri, 17 Jun 2011 16:13:13 GMT
I see ;)

Von meinem iPhone gesendet

Am 17.06.2011 um 17:55 schrieb Jonathan Ellis <jbellis@gmail.com>:

> If you don't get frustrated writing Thrift by hand you are a far, far
> more patient man than I am.
> 
> It's tedious and error-prone to boot.
> 
> On Fri, Jun 17, 2011 at 10:30 AM, Markus Wiesenbacher | Codefreun.de
> <mw@codefreun.de> wrote:
>> One question regarding point 2: Why should we always use Hector, Thrift is not that
bad?
>> 
>> Von meinem iPhone gesendet
>> 
>> Am 17.06.2011 um 17:12 schrieb Jonathan Ellis <jbellis@gmail.com>:
>> 
>>> 1. the right way to right that is to just say struct.name, struct.value, etc
>>> 2. why are you writing raw thrift instead of using Hector?
>>> 
>>> On Fri, Jun 17, 2011 at 5:03 AM, Vivek Mishra
>>> <vivek.mishra@impetus.co.in> wrote:
>>>> 
>>>> 
>>>> 
>>>> 
>>>> From: Vivek Mishra
>>>> Sent: Friday, June 17, 2011 3:25 PM
>>>> To: user@cassandra.apache.org
>>>> Subject: getFieldValue()
>>>> 
>>>> 
>>>> 
>>>> Hi,
>>>> 
>>>> I was looking into  getFieldValue method for SuperColumn and SlicePredicate
>>>> apis.
>>>> 
>>>> 
>>>> 
>>>> It looks to me slight confusing as underlying APIs are returning Object and
>>>> developer can only be aware of type of object either by looking into
>>>> Cassandra code base or by ClassCastException.
>>>> 
>>>> 
>>>> 
>>>> For example,
>>>> 
>>>> 
>>>> 
>>>> I need to retrieve column name  and it’s value for a SuperColumnFamily
>>>> “SuperCli” is:
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> List<KeySlice> keySlices = cassndraClient.get_range_slices(new ColumnParent(
>>>> 
>>>>                         "SuperCli"), slicePredicate, keyRange,
>>>> ConsistencyLevel.ONE);
>>>> 
>>>>             System.out.println(keySlices.size()
>>>> 
>>>>                         + " No. of rows exist for the column family:" +
>>>> "SuperCli");
>>>> 
>>>>             for( KeySlice slice :keySlices)
>>>> 
>>>>             {
>>>> 
>>>>                   city = "noida";
>>>> 
>>>> System.out.println(new String((byte[])
>>>> (slice.getColumns().get(0).getSuper_column().getFieldValue(org.apache.cassandra.thrift.SuperColumn._Fields.NAME))).toString());
>>>> 
>>>>             }
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> Am I doing something wrong or such typecasting is must? Shouldn’t we hide
>>>> this complexity and handle it implicitly in CASSANDRA? Or may be introducing
>>>> a Helper Class can reduce such amount of code ?
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> Is it possible to retrieve a specific SuperColumn by specifying it’s value
>>>> in SliceRange query?
>>>> 
>>>> 
>>>> 
>>>> I can’t see any method with  such search API and I believe it is a real
time
>>>> scenario.
>>>> 
>>>> 
>>>> 
>>>> SuperCli is a super column family holding number of dynamic super columns.
>>>> 
>>>> 
>>>> 
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>>> 
>>> 
>>> 
>>> --
>>> Jonathan Ellis
>>> Project Chair, Apache Cassandra
>>> co-founder of DataStax, the source for professional Cassandra support
>>> http://www.datastax.com
>> 
> 
> 
> 
> -- 
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of DataStax, the source for professional Cassandra support
> http://www.datastax.com

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