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<?php
namespace PicoDb\Driver;
use PDO;
use PDOException;
/**
* Postgres Driver
*
* @package PicoDb\Driver
* @author Frederic Guillot
*/
class Postgres extends Base
{
/**
* List of required settings options
*
* @access protected
* @var array
*/
protected $requiredAttributes = array(
'database',
);
/**
* Table to store the schema version
*
* @access private
* @var array
*/
private $schemaTable = 'schema_version';
/**
* Create a new PDO connection
*
* @access public
* @param array $settings
*/
public function createConnection(array $settings)
{
$dsn = 'pgsql:dbname='.$settings['database'];
$username = null;
$password = null;
if (! empty($settings['username'])) {
$username = $settings['username'];
}
if (! empty($settings['password'])) {
$password = $settings['password'];
}
if (! empty($settings['hostname'])) {
$dsn .= ';host='.$settings['hostname'];
}
if (! empty($settings['port'])) {
$dsn .= ';port='.$settings['port'];
}
$this->pdo = new PDO($dsn, $username, $password);
if (isset($settings['schema_table'])) {
$this->schemaTable = $settings['schema_table'];
}
}
/**
* Enable foreign keys
*
* @access public
*/
public function enableForeignKeys()
{
}
/**
* Disable foreign keys
*
* @access public
*/
public function disableForeignKeys()
{
}
/**
* Return true if the error code is a duplicate key
*
* @access public
* @param integer $code
* @return boolean
*/
public function isDuplicateKeyError($code)
{
return $code == 23505 || $code == 23503;
}
/**
* Escape identifier
*
* @access public
* @param string $identifier
* @return string
*/
public function escape($identifier)
{
return '"'.$identifier.'"';
}
/**
* Get non standard operator
*
* @access public
* @param string $operator
* @return string
*/
public function getOperator($operator)
{
if ($operator === 'LIKE') {
return 'LIKE';
}
else if ($operator === 'ILIKE') {
return 'ILIKE';
}
return '';
}
/**
* Get last inserted id
*
* @access public
* @return integer
*/
public function getLastId()
{
try {
$rq = $this->pdo->prepare('SELECT LASTVAL()');
$rq->execute();
return $rq->fetchColumn();
}
catch (PDOException $e) {
return 0;
}
}
/**
* Get current schema version
*
* @access public
* @return integer
*/
public function getSchemaVersion()
{
$this->pdo->exec("CREATE TABLE IF NOT EXISTS ".$this->schemaTable." (version INTEGER DEFAULT 0)");
$rq = $this->pdo->prepare('SELECT "version" FROM "'.$this->schemaTable.'"');
$rq->execute();
$result = $rq->fetchColumn();
if ($result !== false) {
return (int) $result;
}
else {
$this->pdo->exec('INSERT INTO '.$this->schemaTable.' VALUES(0)');
}
return 0;
}
/**
* Set current schema version
*
* @access public
* @param integer $version
*/
public function setSchemaVersion($version)
{
$rq = $this->pdo->prepare('UPDATE '.$this->schemaTable.' SET version=?');
$rq->execute(array($version));
}
/**
* Run EXPLAIN command
*
* @param string $sql
* @param array $values
* @return array
*/
public function explain($sql, array $values)
{
return $this->getConnection()->query('EXPLAIN (FORMAT YAML) '.$this->getSqlFromPreparedStatement($sql, $values))->fetchAll(PDO::FETCH_ASSOC);
}
/**
* Get database version
*
* @access public
* @return array
*/
public function getDatabaseVersion()
{
return $this->getConnection()->query('SHOW server_version')->fetchColumn();
}
}
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