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<?php |
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namespace MatthiasMullie\Scrapbook\Adapters; |
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/** |
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* PostgreSQL adapter. Basically just a wrapper over \PDO, but in an |
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* exchangeable (KeyValueStore) interface. |
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* |
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* @author Matthias Mullie <[email protected]> |
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* @copyright Copyright (c) 2014, Matthias Mullie. All rights reserved |
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* @license LICENSE MIT |
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*/ |
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class PostgreSQL extends SQL |
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{ |
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/** |
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* @var bool |
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*/ |
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protected $conflictSupport = true; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function flush() |
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{ |
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return false !== $this->client->exec("TRUNCATE TABLE $this->table"); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function set($key, $value, $expire = 0) |
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{ |
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if (!$this->conflictSupport) { |
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return parent::set($key, $value, $expire); |
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} |
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$this->clearExpired(); |
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$serialized = $this->serialize($value); |
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$expiration = $this->expire($expire); |
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$statement = $this->client->prepare( |
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"INSERT INTO $this->table (k, v, e) |
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VALUES (:key, :value, :expire) |
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ON CONFLICT (k) DO UPDATE SET v=EXCLUDED.v, e=EXCLUDED.e" |
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); |
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$statement->bindParam(':key', $key); |
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$statement->bindParam(':value', $serialized, \PDO::PARAM_LOB, strlen($serialized)); |
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$statement->bindParam(':expire', $expiration); |
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$statement->execute(); |
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// ON CONFLICT is not supported in versions < 9.5, in which case we'll |
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// have to fall back on add/replace |
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if ('42601' === $statement->errorCode()) { |
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$this->conflictSupport = false; |
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return $this->set($key, $value, $expire); |
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} |
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return 1 === $statement->rowCount(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get($key, &$token = null) |
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{ |
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$return = parent::get($key, $token); |
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if (null !== $token) { |
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// BYTEA data return streams - we actually need the data in |
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// serialized format, not some silly stream |
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$token = $this->serialize($return); |
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} |
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return $return; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMulti(array $keys, array &$tokens = null) |
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{ |
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$return = parent::getMulti($keys, $tokens); |
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foreach ($return as $key => $value) { |
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// BYTEA data return streams - we actually need the data in |
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// serialized format, not some silly stream |
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$tokens[$key] = $this->serialize($value); |
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} |
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return $return; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function init() |
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{ |
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$this->client->exec( |
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"CREATE TABLE IF NOT EXISTS $this->table ( |
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k VARCHAR NOT NULL PRIMARY KEY, |
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v BYTEA, |
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e TIMESTAMP NULL DEFAULT NULL |
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)" |
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); |
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$this->client->exec("CREATE INDEX IF NOT EXISTS e_index ON $this->table (e)"); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function unserialize($value) |
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{ |
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// BYTEA data return streams. Even though it's not how init() will |
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// configure the DB by default, it could be used instead! |
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if (is_resource($value)) { |
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$value = stream_get_contents($value); |
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} |
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return parent::unserialize($value); |
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} |
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} |
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matthiasmullie /
scrapbook
