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<?php
namespace PicoDb;
class Postgres extends \PDO {
private $schema_table = 'schema_version';
public function __construct(array $settings)
{
$required_atttributes = array(
'hostname',
'username',
'password',
'database',
);
foreach ($required_atttributes as $attribute) {
if (! isset($settings[$attribute])) {
throw new \LogicException('This configuration parameter is missing: "'.$attribute.'"');
}
}
$dsn = 'pgsql:host='.$settings['hostname'].';dbname='.$settings['database'];
parent::__construct($dsn, $settings['username'], $settings['password']);
if (isset($settings['schema_table'])) {
$this->schema_table = $settings['schema_table'];
}
}
public function getSchemaVersion()
{
$this->exec("CREATE TABLE IF NOT EXISTS ".$this->schema_table." (version SMALLINT DEFAULT 0)");
$rq = $this->prepare('SELECT version FROM '.$this->schema_table.'');
$rq->execute();
$result = $rq->fetch(\PDO::FETCH_ASSOC);
if (isset($result['version'])) {
return (int) $result['version'];
}
else {
$this->exec('INSERT INTO '.$this->schema_table.' VALUES(0)');
}
return 0;
}
public function setSchemaVersion($version)
{
$rq = $this->prepare('UPDATE '.$this->schema_table.' SET version=?');
$rq->execute(array($version));
}
public function getLastId()
{
$rq = $this->prepare('SELECT LASTVAL()');
$rq->execute();
return $rq->fetchColumn();
}
public function escapeIdentifier($value)
{
return $value;
}
}
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