Simple Statements

PHP Driver supports simple statements.

Background

Given

a running Cassandra cluster

And

the following schema:

CREATE KEYSPACE simplex WITH replication = {
  'class': 'SimpleStrategy',
  'replication_factor': 1
};
USE simplex;
CREATE TABLE playlists (
  id uuid,
  title text,
  album text,
  artist text,
  song_id uuid,
  PRIMARY KEY (id, title, album, artist)
);

Simple statements are initialized with a CQL string

Given

the following example:

<?php
$cluster   = Cassandra::cluster()
               ->withContactPoints('127.0.0.1')
               ->build();
$session   = $cluster->connect("simplex");
$statement = new Cassandra\SimpleStatement("SELECT * FROM playlists");
$result    = $session->execute($statement);
echo "Result contains " . $result->count() . " rows";

When

it is executed

Then

its output should contain:

Result contains 0 rows

Simple statements only support positional arguments

Given

the following example:

<?php
$cluster   = Cassandra::cluster()
               ->withContactPoints('127.0.0.1')
               ->build();
$session   = $cluster->connect("simplex");
$statement = new Cassandra\SimpleStatement(
               "INSERT INTO playlists (id, song_id, artist, title, album) " .
               "VALUES (62c36092-82a1-3a00-93d1-46196ee77204, ?, ?, ?, ?)"
             );

$songs = array(
    array(
        new Cassandra\Uuid('756716f7-2e54-4715-9f00-91dcbea6cf50'),
        'Joséphine Baker',
        'La Petite Tonkinoise',
        'Bye Bye Blackbird'
    ),
    array(
        new Cassandra\Uuid('f6071e72-48ec-4fcb-bf3e-379c8a696488'),
        'Willi Ostermann',
        'Die Mösch',
        'In Gold'
    ),
    array(
        new Cassandra\Uuid('fbdf82ed-0063-4796-9c7c-a3d4f47b4b25'),
        'Mick Jager',
        'Memo From Turner',
        'Performance'
    ),
);

foreach ($songs as $song) {
    $options = new Cassandra\ExecutionOptions(array('arguments' => $song));
    $session->execute($statement, $options);
}

$statement = new Cassandra\SimpleStatement("SELECT * FROM simplex.playlists");
$result    = $session->execute($statement);

foreach ($result as $row) {
  echo $row['artist'] . ": " . $row['title'] . " / " . $row['album'] . "\n";
}

When

it is executed

Then

its output should contain:

Joséphine Baker: La Petite Tonkinoise / Bye Bye Blackbird

And

its output should contain:

Willi Ostermann: Die Mösch / In Gold

And

its output should contain:

Mick Jager: Memo From Turner / Performance