mirror of
https://github.com/dg/dibi.git
synced 2025-02-24 10:53:17 +01:00
453 lines
9.4 KiB
PHP
453 lines
9.4 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, 2008 David Grudl (http://davidgrudl.com)
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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, 2008 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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* @version $Id$
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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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* - 'pdo' - PDO object (optional)
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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, 2008 David Grudl
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* @package dibi
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*/
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class DibiPdoDriver extends DibiObject implements IDibiDriver
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{
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/** @var PDO Connection resource */
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private $connection;
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/** @var PDOStatement Resultset resource */
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private $resultSet;
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/** @var int|FALSE Affected rows */
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private $affectedRows = FALSE;
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/**
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* @throws DibiException
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*/
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public function __construct()
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{
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if (!extension_loaded('pdo')) {
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throw new DibiDriverException("PHP extension 'pdo' is not loaded.");
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}
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}
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/**
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* Connects to a database.
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* @return void
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* @throws DibiException
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*/
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public function connect(array &$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, 'pdo');
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DibiConnection::alias($config, 'options');
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if ($config['pdo'] instanceof PDO) {
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$this->connection = $config['pdo'];
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} else try {
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$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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* @return void
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*/
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public function disconnect()
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{
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$this->connection = NULL;
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}
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/**
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* Executes the SQL query.
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* @param string SQL statement.
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* @return IDibiDriver|NULL
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* @throws DibiDriverException
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*/
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public function query($sql)
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{
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// must detect if SQL returns result set 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 ($this->affectedRows === FALSE) {
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$err = $this->connection->errorInfo();
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throw new DibiDriverException("SQLSTATE[$err[0]]: $err[2]", $err[1], $sql);
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}
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return NULL;
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} else {
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$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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$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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return clone $this;
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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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* @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 $this->affectedRows;
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}
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/**
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* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query.
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* @return int|FALSE int on success or FALSE on failure
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*/
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public function insertId($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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$err = $this->connection->errorInfo();
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throw new DibiDriverException("SQLSTATE[$err[0]]: $err[2]", $err[1]);
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}
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}
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/**
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* Commits statements in a transaction.
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* @return void
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* @throws DibiDriverException
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*/
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public function commit()
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{
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if (!$this->connection->commit()) {
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$err = $this->connection->errorInfo();
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throw new DibiDriverException("SQLSTATE[$err[0]]: $err[2]", $err[1]);
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}
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}
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/**
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* Rollback changes in a transaction.
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* @return void
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* @throws DibiDriverException
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*/
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public function rollback()
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{
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if (!$this->connection->rollBack()) {
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$err = $this->connection->errorInfo();
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throw new DibiDriverException("SQLSTATE[$err[0]]: $err[2]", $err[1]);
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}
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}
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/**
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* Returns the connection resource.
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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 $this->connection;
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}
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/********************* SQL ****************d*g**/
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/**
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* Encodes data for use in an SQL statement.
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* @param string value
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* @param string type (dibi::FIELD_TEXT, dibi::FIELD_BOOL, ...)
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* @return string encoded value
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* @throws InvalidArgumentException
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*/
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public function escape($value, $type)
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{
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switch ($type) {
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case dibi::FIELD_TEXT:
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return $this->connection->quote($value, PDO::PARAM_STR);
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case dibi::FIELD_BINARY:
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return $this->connection->quote($value, PDO::PARAM_LOB);
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case dibi::IDENTIFIER:
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switch ($this->connection->getAttribute(PDO::ATTR_DRIVER_NAME)) {
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case 'mysql':
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$value = str_replace('`', '``', $value);
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return '`' . str_replace('.', '`.`', $value) . '`';
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case 'pgsql':
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$a = strrpos($value, '.');
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if ($a === FALSE) {
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return '"' . str_replace('"', '""', $value) . '"';
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} else {
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return substr($value, 0, $a) . '."' . str_replace('"', '""', substr($value, $a + 1)) . '"';
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}
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case 'sqlite':
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case 'sqlite2':
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$value = strtr($value, '[]', ' ');
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case 'odbc':
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case 'oci': // TODO: not tested
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case 'mssql':
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$value = str_replace(array('[', ']'), array('[[', ']]'), $value);
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return '[' . str_replace('.', '].[', $value) . ']';
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default:
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return $value;
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}
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case dibi::FIELD_BOOL:
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return $this->connection->quote($value, PDO::PARAM_BOOL);
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case dibi::FIELD_DATE:
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return date("'Y-m-d'", $value);
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case dibi::FIELD_DATETIME:
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return date("'Y-m-d H:i:s'", $value);
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default:
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throw new InvalidArgumentException('Unsupported type.');
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}
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}
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/**
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* Decodes data from result set.
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* @param string value
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* @param string type (dibi::FIELD_BINARY)
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* @return string decoded value
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* @throws InvalidArgumentException
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*/
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public function unescape($value, $type)
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{
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throw new InvalidArgumentException('Unsupported type.');
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}
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/**
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* Injects LIMIT/OFFSET to the SQL query.
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* @param string &$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, $offset)
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{
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throw new NotSupportedException('PDO does not support applying limit or offset.');
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}
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/********************* result set ****************d*g**/
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/**
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* Returns the number of rows in a result set.
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* @return int
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*/
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public function rowCount()
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{
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throw new DibiDriverException('Row count is not available for unbuffered queries.');
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}
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/**
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* Fetches the row at current position and moves the internal cursor to the next position.
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* @param bool TRUE for associative array, FALSE for numeric
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* @return array array on success, nonarray if no next record
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* @internal
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*/
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public function fetch($assoc)
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{
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return $this->resultSet->fetch($assoc ? 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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* @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($row)
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{
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throw new DibiDriverException('Cannot seek an unbuffered result set.');
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}
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/**
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* Frees the resources allocated for this result set.
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* @return void
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*/
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public function free()
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{
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$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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* @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 = $this->resultSet->columnCount();
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$res = array();
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for ($i = 0; $i < $count; $i++) {
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$row = @$this->resultSet->getColumnMeta($i); // intentionally @
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if ($row === FALSE) {
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throw new DibiDriverException('Driver does not support meta data.');
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}
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$res[] = array(
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'name' => $row['name'],
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'table' => $row['table'],
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'nativetype' => $row['native_type'],
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'fullname' => $row['table'] ? $row['table'] . '.' . $row['name'] : $row['name'],
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'vendor' => $row,
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);
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}
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return $res;
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}
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/**
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* Returns the result set resource.
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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 $this->resultSet;
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}
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/********************* reflection ****************d*g**/
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/**
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* Returns list of tables.
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* @return array
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*/
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public function getTables()
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{
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throw new NotImplementedException;
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}
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/**
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* Returns metadata for all columns in a table.
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* @param string
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* @return array
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*/
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public function getColumns($table)
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{
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throw new NotImplementedException;
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}
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/**
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* Returns metadata for all indexes in a table.
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* @param string
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* @return array
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*/
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public function getIndexes($table)
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{
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throw new NotImplementedException;
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}
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/**
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* Returns metadata for all foreign keys in a table.
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* @param string
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* @return array
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*/
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public function getForeignKeys($table)
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{
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throw new NotImplementedException;
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}
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}
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