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List:       cassandra-dev
Subject:    Re: "[applied]" column in ModificationStatement?
From:       Brian O'Neill <bone () alumni ! brown ! edu>
Date:       2014-02-06 21:13:45
Message-ID: CF19647E.94838%bone () alumni ! brown ! edu
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Thanks Jonathan.  
It feels a little weird, but that will work.

Not a big deal, but maybe we could include a wasApplied() method on the
ResultSet in the future that would insulate clients from the ResultSet
schema/column name.

-brian


---
Brian O'Neill
Chief Technology Officer

Health Market Science
The Science of Better Results
2700 Horizon Drive • King of Prussia, PA • 19406
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On 2/6/14, 2:58 PM, "Jonathan Ellis" <jbellis@gmail.com> wrote:

>In Cassandra, it's ModificationStatement.CAS_RESULT_COLUMN.text
>
>On Thu, Feb 6, 2014 at 10:22 AM, Brian O'Neill <bone@alumni.brown.edu>
>wrote:
>> Silly questionÅ 
>>
>> Using the CQL driver for conditional updates, I ¹m looking into the
>>ResultSet
>> that comes back:
>>         for (ColumnDefinitions.Definition definition :
>> results.getColumnDefinitions().asList()) {
>>             for (Row row : results.all()) {
>>                 LOG.debug("UPDATE APPLIED = [{}]=[{}]",
>> definition.getName(), row.getBool(definition.getName()));
>>             }
>>         }
>>
>> I noticed that the ResultSet of a conditional update contains a column
>>  ³[applied] ², with a boolean indicating whether or not the update was
>> applied.
>>
>> I assume this column name comes from:
>> 
>>src/java/org/apache/cassandra/cql3/statements/ModificationStatement.java:
>>50
>>    private static final ColumnIdentifier CAS_RESULT_COLUMN = new
>> ColumnIdentifier("[applied]", false);
>>
>> Does it make sense to expose this column name as a String constant
>> somewhere?
>> Either in the CQL java-driver, or Cassandra itself?
>>
>> -brian
>>
>> ---
>> Brian O'Neill
>> Chief Technology Officer
>>
>>
>> Health Market Science
>> The Science of Better Results
>> 2700 Horizon Drive € King of Prussia, PA € 19406
>> M: 215.588.6024 € @boneill42 <http://www.twitter.com/boneill42>   €
>> healthmarketscience.com
>>
>>
>> This information transmitted in this email message is for the intended
>> recipient only and may contain confidential and/or privileged material.
>>If
>> you received this email in error and are not the intended recipient, or
>>the
>> person responsible to deliver it to the intended recipient, please
>>contact
>> the sender at the email above and delete this email and any attachments
>>and
>> destroy any copies thereof. Any review, retransmission, dissemination,
>> copying or other use of, or taking any action in reliance upon, this
>> information by persons or entities other than the intended recipient is
>> strictly prohibited.
>>
>>
>>
>
>
>
>-- 
>Jonathan Ellis
>Project Chair, Apache Cassandra
>co-founder, http://www.datastax.com
>@spyced


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