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<?php
namespace PicoDb\Driver;
use PDO;
use LogicException;
use PDOException;
/**
* Base Driver class
*
* @package PicoDb\Driver
* @author Frederic Guillot
*/
abstract class Base
{
/**
* List of required settings options
*
* @access protected
* @var array
*/
protected $requiredAttributes = array();
/**
* PDO connection
*
* @access protected
* @var PDO
*/
protected $pdo = null;
/**
* Create a new PDO connection
*
* @abstract
* @access public
* @param array $settings
*/
abstract public function createConnection(array $settings);
/**
* Enable foreign keys
*
* @abstract
* @access public
*/
abstract public function enableForeignKeys();
/**
* Disable foreign keys
*
* @abstract
* @access public
*/
abstract public function disableForeignKeys();
/**
* Return true if the error code is a duplicate key
*
* @abstract
* @access public
* @param integer $code
* @return boolean
*/
abstract public function isDuplicateKeyError($code);
/**
* Escape identifier
*
* @abstract
* @access public
* @param string $identifier
* @return string
*/
abstract public function escape($identifier);
/**
* Get non standard operator
*
* @abstract
* @access public
* @param string $operator
* @return string
*/
abstract public function getOperator($operator);
/**
* Get last inserted id
*
* @abstract
* @access public
* @return integer
*/
abstract public function getLastId();
/**
* Get current schema version
*
* @abstract
* @access public
* @return integer
*/
abstract public function getSchemaVersion();
/**
* Set current schema version
*
* @abstract
* @access public
* @param integer $version
*/
abstract public function setSchemaVersion($version);
/**
* Constructor
*
* @access public
* @param array $settings
*/
public function __construct(array $settings)
{
foreach ($this->requiredAttributes as $attribute) {
if (! isset($settings[$attribute])) {
throw new LogicException('This configuration parameter is missing: "'.$attribute.'"');
}
}
$this->createConnection($settings);
$this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
/**
* Get the PDO connection
*
* @access public
* @return PDO
*/
public function getConnection()
{
return $this->pdo;
}
/**
* Release the PDO connection
*
* @access public
*/
public function closeConnection()
{
$this->pdo = null;
}
/**
* 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) {
$rq = $this->pdo->prepare('SELECT 1 FROM '.$this->escape($table).' WHERE '.$this->escape($keyColumn).'=?');
$rq->execute(array($key));
if ($rq->fetchColumn()) {
$rq = $this->pdo->prepare('UPDATE '.$this->escape($table).' SET '.$this->escape($valueColumn).'=? WHERE '.$this->escape($keyColumn).'=?');
$rq->execute(array($value, $key));
}
else {
$rq = $this->pdo->prepare('INSERT INTO '.$this->escape($table).' ('.$this->escape($keyColumn).', '.$this->escape($valueColumn).') VALUES (?, ?)');
$rq->execute(array($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 $this->getConnection()->query('EXPLAIN '.$this->getSqlFromPreparedStatement($sql, $values))->fetchAll(PDO::FETCH_ASSOC);
}
/**
* Replace placeholder with values in prepared statement
*
* @access protected
* @param string $sql
* @param array $values
* @return string
*/
protected function getSqlFromPreparedStatement($sql, array $values)
{
foreach ($values as $value) {
$sql = substr_replace($sql, "'$value'", strpos($sql, '?'), 1);
}
return $sql;
}
/**
* Get database version
*
* @access public
* @return array
*/
public function getDatabaseVersion()
{
return $this->getConnection()->query('SELECT VERSION()')->fetchColumn();
}
}
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