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<?php
namespace PicoDb\Driver;
use PDO;
use PDOException;
/**
* Sqlite Driver
*
* @package PicoDb\Driver
* @author Frederic Guillot
*/
class Sqlite extends Base
{
/**
* List of required settings options
*
* @access protected
* @var array
*/
protected $requiredAttributes = array('filename');
/**
* Create a new PDO connection
*
* @access public
* @param array $settings
*/
public function createConnection(array $settings)
{
$this->pdo = new PDO('sqlite:'.$settings['filename']);
$this->enableForeignKeys();
}
/**
* Enable foreign keys
*
* @access public
*/
public function enableForeignKeys()
{
$this->pdo->exec('PRAGMA foreign_keys = ON');
}
/**
* Disable foreign keys
*
* @access public
*/
public function disableForeignKeys()
{
$this->pdo->exec('PRAGMA foreign_keys = OFF');
}
/**
* Return true if the error code is a duplicate key
*
* @access public
* @param integer $code
* @return boolean
*/
public function isDuplicateKeyError($code)
{
return $code == 23000;
}
/**
* 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' || $operator === 'ILIKE') {
return 'LIKE';
}
return '';
}
/**
* Get last inserted id
*
* @access public
* @return integer
*/
public function getLastId()
{
return $this->pdo->lastInsertId();
}
/**
* Get current schema version
*
* @access public
* @return integer
*/
public function getSchemaVersion()
{
$rq = $this->pdo->prepare('PRAGMA user_version');
$rq->execute();
return (int) $rq->fetchColumn();
}
/**
* Set current schema version
*
* @access public
* @param integer $version
*/
public function setSchemaVersion($version)
{
$this->pdo->exec('PRAGMA user_version='.$version);
}
/**
* Upsert for a key/value variable
*
* @access public
* @param string $table
* @param string $keyColumn
* @param string $valueColumn
* @param array $dictionary
* @return bool False on failure
*/
public function upsert($table, $keyColumn, $valueColumn, array $dictionary)
{
try {
$this->pdo->beginTransaction();
foreach ($dictionary as $key => $value) {
$sql = sprintf(
'INSERT OR REPLACE INTO %s (%s, %s) VALUES (?, ?)',
$this->escape($table),
$this->escape($keyColumn),
$this->escape($valueColumn)
);
$rq = $this->pdo->prepare($sql);
$rq->execute(array($key, $value));
}
$this->pdo->commit();
return true;
}
catch (PDOException $e) {
$this->pdo->rollBack();
return false;
}
}
/**
* Run EXPLAIN command
*
* @access public
* @param string $sql
* @param array $values
* @return array
*/
public function explain($sql, array $values)
{
return $this->getConnection()->query('EXPLAIN QUERY PLAN '.$this->getSqlFromPreparedStatement($sql, $values))->fetchAll(PDO::FETCH_ASSOC);
}
/**
* Get database version
*
* @access public
* @return array
*/
public function getDatabaseVersion()
{
return $this->getConnection()->query('SELECT sqlite_version()')->fetchColumn();
}
}
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