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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3025) PHP/PDO driver for Cassandra CQL
Date Fri, 26 Aug 2011 16:18:30 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091848#comment-13091848
] 

Jonathan Ellis commented on CASSANDRA-3025:
-------------------------------------------

bq. PDO doesn't seem to allow variable number of columns per row

How deep does this assumption go?  In JDBC all rows are *supposed* to have the same number
of columns but nothing actually breaks if you quietly ignore this.

bq. In the current approach I iterated the result set, found the row with most columns and
used that as a column count for all rows

More correctly, what we would need is the union of all column names found.

bq. This causes a problem when some rows have less columns because those missing columns don't
have names

They do if you take the union approach.  To take my simple example,

bq. row 1 has columns A, B, row 2 has columns A, C

You could return a resultset like

{noformat}
key |  A  |  B  |  C 
----+-----+-----+-----
  1 | foo | bar | null
  2 | baz | null| biz
{noformat}


> PHP/PDO driver for Cassandra CQL
> --------------------------------
>
>                 Key: CASSANDRA-3025
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3025
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API
>            Reporter: Mikko Koppanen
>              Labels: php
>         Attachments: pdo_cassandra-0.1.0.tgz, pdo_cassandra-0.1.1.tgz, pdo_cassandra-0.1.2.tgz,
php_test_results_20110818_2317.txt
>
>
> Hello,
> attached is the initial version of the PDO driver for Cassandra CQL language. This is
a native PHP extension written in what I would call a combination of C and C++, due to PHP
being C. The thrift API used is the C++.
> The API looks roughly following:
> {code}
> <?php
> $db = new PDO('cassandra:host=127.0.0.1;port=9160');
> $db->exec ("CREATE KEYSPACE mytest with strategy_class = 'SimpleStrategy' and strategy_options:replication_factor=1;");
> $db->exec ("USE mytest");
> $db->exec ("CREATE COLUMNFAMILY users (
> 			my_key varchar PRIMARY KEY,
> 			full_name varchar );");
> 			
> $stmt = $db->prepare ("INSERT INTO users (my_key, full_name) VALUES (:key, :full_name);");
> $stmt->execute (array (':key' => 'mikko', ':full_name' => 'Mikko K' ));
> {code}
> Currently prepared statements are emulated on the client side but I understand that there
is a plan to add prepared statements to Cassandra CQL API as well. I will add this feature
in to the extension as soon as they are implemented.
> Additional documentation can be found in github https://github.com/mkoppanen/php-pdo_cassandra,
in the form of rendered MarkDown file. Tests are currently not included in the package file
and they can be found in the github for now as well.
> I have created documentation in docbook format as well, but have not yet rendered it.
> Comments and feedback are welcome.
> Thanks,
> Mikko

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