Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@cassandra.apache.org
Received-SPF: pass (nike.apache.org: domain of jbellis@gmail.com designates
 209.85.160.44 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        b=iIoJ8EM7mdOC9V5mQi9/Y99TPOxGUjKaJB5ZZ4WO+p6lhaVLAWxCfTMeXyIwgorrqp
         E9vNxq8752SqUUiWRcYmE+wP3F7uYS6IFDYCVh/tYhi+09bvqyEgobvqLH3lAsuHgz1d
         wCIB1j/ZXODDUpiMhMKSG8RHOiX1Q/VUvg5+c=
MIME-Version: 1.0
In-Reply-To: <AANLkTimizWe53SLssJmT=WR0YEk_9bgyBCRNgX8KO-hH@mail.gmail.com>
References: <AANLkTinbSSyP18BMYVf3YzA1LiQvK02m4Bnn1kA5jggn@mail.gmail.com>
	<AANLkTimizWe53SLssJmT=WR0YEk_9bgyBCRNgX8KO-hH@mail.gmail.com>
Date: Sat, 25 Dec 2010 00:05:44 -0600
Message-ID: <AANLkTikh6_qq6szsbRahOsU71Z65nzN0HfJadFFBsy-h@mail.gmail.com>
Subject: Re: Newbie question - fetching multiple columns of different
 datatypes and conversion from byte[]
From: Jonathan Ellis <jbellis@gmail.com>
To: user <user@cassandra.apache.org>
Content-Type: text/plain; charset=ISO-8859-1

Or you can specify the types with the column name instead of doing a slice.

On Fri, Dec 24, 2010 at 11:23 PM, Nate McCall <nate@riptano.com> wrote:
> In the case where you have different value types within the same
> slice, yes, you must handle the conversion yourself and
> ByteBufferSerializer is the easiest way to do that.
>
> On Fri, Dec 24, 2010 at 10:44 PM, Roshan Dawrani
> <roshandawrani@gmail.com> wrote:
>> Hi,
>>
>> I am new to Cassandra and Hector and have a basic question on fetching
>> multiple columns of a row that have mixed data types.
>>
>> So, I am basically doing equivalent of "Select dateCol1, dateCol2,
>> stringCol1, intCol1 from a_table where key in (?, ?, ?...)"
>>
>> My question is do I need to do the conversion of columns from byte[] to
>> Date/String/Int myself after taking out data from the ColumnSlice?
>>
>> For saving the same data, while adding the columns, I was able to tell which
>> serializer to use, but slice queries seem to take only one ValueSerializer
>> for all columns being retrieved. So, if I have got it correctly, I can only
>> use ByteBufferSerializer in the Hector API slice query call and then do
>> further data-type specific conversion myself at the app level?
>>
>> --
>> Roshan
>> Blog: http://roshandawrani.wordpress.com/
>> Twitter: @roshandawrani
>> Skype: roshandawrani
>>
>


-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com