mirror of
https://github.com/dg/dibi.git
synced 2025-02-24 19:02:36 +01:00
369 lines
8.6 KiB
PHP
369 lines
8.6 KiB
PHP
<?php
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/**
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* dibi - tiny'n'smart database abstraction layer
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* ----------------------------------------------
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*
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* Copyright (c) 2005, 2007 David Grudl aka -dgx- (http://www.dgx.cz)
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*
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* This source file is subject to the "dibi license" that is bundled
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* with this package in the file license.txt.
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*
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* For more information please see http://dibiphp.com/
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*
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* @copyright Copyright (c) 2005, 2007 David Grudl
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* @license http://dibiphp.com/license dibi license
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* @link http://dibiphp.com/
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* @package dibi
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*/
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/**
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* The dibi driver for PDO
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*
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* Connection options:
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* - 'dsn' - driver specific DSN
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* - 'username' (or 'user')
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* - 'password' (or 'pass')
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* - 'options' - driver specific options array
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* - 'lazy' - if TRUE, connection will be established only when required
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*
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* @author David Grudl
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* @copyright Copyright (c) 2005, 2007 David Grudl
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* @package dibi
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* @version $Revision$ $Date$
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*/
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class DibiPdoDriver extends NObject implements DibiDriverInterface
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{
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/**
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* Connection resource
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* @var PDO
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*/
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private $connection;
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/**
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* Resultset resource
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* @var PDOStatement
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*/
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private $resultset;
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/**
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* Affected rows
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* @var int
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*/
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private $affectedRows = FALSE;
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/**
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* @throws DibiException
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*/
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public function __construct()
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{
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if (!extension_loaded('pdo')) {
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throw new DibiDriverException("PHP extension 'pdo' is not loaded");
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}
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}
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/**
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* Connects to a database
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*
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* @return void
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* @throws DibiException
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*/
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public function connect(array &$config)
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{
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DibiConnection::alias($config, 'username', 'user');
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DibiConnection::alias($config, 'password', 'pass');
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DibiConnection::alias($config, 'dsn');
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DibiConnection::alias($config, 'options');
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try {
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$this->connection = new PDO($config['dsn'], $config['username'], $config['password'], $config['options']);
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} catch (PDOException $e) {
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throw new DibiDriverException($e->getMessage(), $e->getCode());
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}
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if (!$this->connection) {
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throw new DibiDriverException('Connecting error');
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}
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}
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/**
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* Disconnects from a database
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*
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* @return void
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*/
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public function disconnect()
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{
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$this->connection = NULL;
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}
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/**
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* Executes the SQL query
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*
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* @param string SQL statement.
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* @return bool have resultset?
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* @throws DibiDriverException
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*/
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public function query($sql)
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{
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// must detect if SQL returns resultset or num of affected rows
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$cmd = strtoupper(substr(ltrim($sql), 0, 6));
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$list = array('UPDATE'=>1, 'DELETE'=>1, 'INSERT'=>1, 'REPLAC'=>1);
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if (isset($list[$cmd])) {
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$this->resultset = NULL;
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$this->affectedRows = $this->connection->exec($sql);
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if ($this->affectedRows === FALSE) {
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$this->throwException($sql);
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}
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return FALSE;
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} else {
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$this->resultset = $this->connection->query($sql);
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$this->affectedRows = FALSE;
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if ($this->resultset === FALSE) {
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$this->throwException($sql);
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}
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return TRUE;
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}
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}
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/**
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* Gets the number of affected rows by the last INSERT, UPDATE or DELETE query
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*
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* @return int|FALSE number of rows or FALSE on error
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*/
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public function affectedRows()
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{
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return $this->affectedRows;
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}
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/**
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* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query
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*
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* @return int|FALSE int on success or FALSE on failure
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*/
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public function insertId($sequence)
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{
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return $this->connection->lastInsertId();
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}
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/**
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* Begins a transaction (if supported).
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* @return void
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* @throws DibiDriverException
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*/
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public function begin()
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{
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if (!$this->connection->beginTransaction()) {
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$this->throwException();
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}
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}
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/**
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* Commits statements in a transaction.
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* @return void
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* @throws DibiDriverException
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*/
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public function commit()
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{
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if (!$this->connection->commit()) {
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$this->throwException();
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}
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}
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/**
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* Rollback changes in a transaction.
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* @return void
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* @throws DibiDriverException
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*/
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public function rollback()
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{
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if (!$this->connection->rollBack()) {
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$this->throwException();
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}
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}
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/**
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* Format to SQL command
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*
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* @param string value
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* @param string type (dibi::FIELD_TEXT, dibi::FIELD_BOOL, dibi::FIELD_DATE, dibi::FIELD_DATETIME, dibi::IDENTIFIER)
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* @return string formatted value
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* @throws InvalidArgumentException
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*/
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public function format($value, $type)
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{
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if ($type === dibi::FIELD_TEXT) return $this->connection->quote($value);
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if ($type === dibi::IDENTIFIER) return $value; // quoting is not supported by PDO
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if ($type === dibi::FIELD_BOOL) return $value ? 1 : 0;
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if ($type === dibi::FIELD_DATE) return date("'Y-m-d'", $value);
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if ($type === dibi::FIELD_DATETIME) return date("'Y-m-d H:i:s'", $value);
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throw new InvalidArgumentException('Unsupported formatting type');
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}
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/**
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* Injects LIMIT/OFFSET to the SQL query
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*
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* @param string &$sql The SQL query that will be modified.
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* @param int $limit
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* @param int $offset
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* @return void
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*/
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public function applyLimit(&$sql, $limit, $offset)
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{
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throw new BadMethodCallException(__METHOD__ . ' is not implemented');
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}
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/**
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* Returns the number of rows in a result set
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*
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* @return int
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*/
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public function rowCount()
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{
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throw new DibiDriverException('Row count is not available for unbuffered queries');
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}
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/**
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* Fetches the row at current position and moves the internal cursor to the next position
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* internal usage only
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*
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* @param bool TRUE for associative array, FALSE for numeric
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* @return array array on success, nonarray if no next record
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*/
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public function fetch($type)
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{
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return $this->resultset->fetch($type ? PDO::FETCH_ASSOC : PDO::FETCH_NUM);
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}
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/**
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* Moves cursor position without fetching row
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*
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* @param int the 0-based cursor pos to seek to
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* @return boolean TRUE on success, FALSE if unable to seek to specified record
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* @throws DibiException
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*/
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public function seek($row)
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{
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throw new DibiDriverException('Cannot seek an unbuffered result set');
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}
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/**
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* Frees the resources allocated for this result set
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*
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* @return void
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*/
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public function free()
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{
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$this->resultset = NULL;
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}
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/**
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* Returns metadata for all columns in a result set
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*
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* @return array
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* @throws DibiException
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*/
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public function getColumnsMeta()
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{
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$count = $this->resultset->columnCount();
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$meta = array();
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for ($i = 0; $i < $count; $i++) {
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// items 'name' and 'table' are required
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$info = @$this->resultset->getColumnsMeta($i);
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if ($info === FALSE) {
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throw new DibiDriverException('Driver does not support meta data');
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}
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$meta[] = $info;
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}
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return $meta;
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}
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/**
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* Converts database error to DibiDriverException
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*
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* @throws DibiDriverException
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*/
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protected function throwException($sql = NULL)
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{
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$err = $this->connection->errorInfo();
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throw new DibiDriverException("SQLSTATE[$err[0]]: $err[2]", $err[1], $sql);
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}
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/**
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* Returns the connection resource
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*
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* @return PDO
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*/
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public function getResource()
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{
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return $this->connection;
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}
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/**
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* Returns the resultset resource
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*
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* @return PDOStatement
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*/
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public function getResultResource()
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{
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return $this->resultset;
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}
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/**
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* Gets a information of the current database.
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*
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* @return DibiReflection
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*/
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function getDibiReflection()
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{}
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}
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