phpcassa cassandra batch mutation - cassandra

Question

Can you provide an example of batch_mutate() function in phpcassa?
Cant understand how to work with this function and didnt found any enough information.
Also i want to know how to use it with counters
Thanks in advance.

Answer 1

"delete data from multiple keys":
function batch_remove($key=null, $columns=null, $super_column=null, $write_consistency_level=null) {
$timestamp = CassandraUtil::get_time();
$deletion = new cassandra_Deletion();
$deletion->timestamp = $timestamp;
if ($super_column !== null) $deletion->super_column = $this->pack_name($super_column, true);
else $deletion->super_column = null;
if ($columns !== null) {
$predicate = $this->create_slice_predicate($columns, '', '', false, self::DEFAULT_COLUMN_COUNT);
$deletion->predicate = $predicate;
}
$mutation = new cassandra_Mutation();
$mutation->deletion = $deletion;
if (is_array($key) && count($key) >= 1) {
$mut_map = array();
foreach($key as $v) {
$packed_key[$v] = $this->pack_key($v);
$mut_map[$v] = array($this->column_family => array($mutation));
}
return $this->pool->call("batch_mutate", $mut_map, $this->wcl($write_consistency_level));
} else return false;
}
//delete name1, name2, name3 from key1, key2 in a single call
$column_family->batch_remove(array(key1, key2), array(name1, name2, name3));

Answer 2

batch_mutate on counters is not available yet with PHPCassa: https://github.com/thobbs/phpcassa/issues/31
batch_mutate in action, as per the tutorial: http://thobbs.github.com/phpcassa/tutorial.html
"inserting data":
$row1 = array('name1' => 'val1', 'name2' => 'val2');
$row2 = array('foo' => 'bar');
$column_family->batch_insert(array('row1' => $row1, 'row2' => $row2);