KeyPair

The KeyPair is a structure where unique values are assigned an ID.

You can think about this as a table with a primary auto-increment key and a single unique column.

Internally, the KeyPair uses two Redis hashes to provide O(1) lookup by both ID and value. It also uses a Redis key to store auto-increment counter.

Redis Structure:

• (namespace:)key = hash(id => value)
• (namespace:)key:ids = hash(value => id)
• (namespace:)key:autoinc = integer

use Redtrine\Structure\KeyPair;

$redisTable = new KeyPair('redisTable');
$redisTable->add('a');
$redisTable->add('b');
$redisTable->add('c');

// At this moment we have an structure like {"1":"a", "2":"b", "3":"c"}
// And we can perform queries by id, value, delete by id and value, etc...

$values = $redisTable->getById(array(1, 2)); // $values is array('a', 'b')

$id = $redisTable->get('a'); // $id is 1

// These 2 expressions would be equivalent in terms of structure
$redisTable->delete('b');
$redisTable->deleteById(2);