[applied] column in ModificationStatement?
Silly question
Using the CQL driver for conditional updates, I¹m 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
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Re: [applied] column in ModificationStatement?
In Cassandra, it's ModificationStatement.CAS_RESULT_COLUMN.text
On Thu, Feb 6, 2014 at 10:22 AM, Brian O'Neill b...@alumni.brown.edu wrote:
Silly questionŠ
Using the CQL driver for conditional updates, I¹m 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
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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
Re: [applied] column in ModificationStatement?
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
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.
On 2/6/14, 2:58 PM, Jonathan Ellis jbel...@gmail.com wrote:
In Cassandra, it's ModificationStatement.CAS_RESULT_COLUMN.text
On Thu, Feb 6, 2014 at 10:22 AM, Brian O'Neill b...@alumni.brown.edu
wrote:
Silly questionŠ
Using the CQL driver for conditional updates, I¹m 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
