mirror of
https://github.com/dg/dibi.git
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417 lines
12 KiB
PHP
417 lines
12 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://php7.org/dibi/
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*
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* @copyright Copyright (c) 2005, 2007 David Grudl
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* @license http://php7.org/dibi/license dibi license
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* @link http://php7.org/dibi/
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* @package dibi
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*/
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/**
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* The dibi driver for MySQL database
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*
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* Connection options:
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* - 'host' - the MySQL server host name
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* - 'port' - the port number to attempt to connect to the MySQL server
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* - 'socket' - the socket or named pipe
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* - 'username' (or 'user')
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* - 'password' (or 'pass')
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* - 'persistent' - try to find a persistent link?
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* - 'database' - the database name to select
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* - 'charset' - sets the encoding
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* - 'unbuffered' - sends query without fetching and buffering the result rows automatically?
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* - 'options' - driver specific constants (MYSQL_*)
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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 DibiMySqlDriver extends NObject implements DibiDriverInterface
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{
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/**
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* Connection resource
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* @var resource
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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 resource
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*/
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private $resultset;
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/**
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* Is buffered (seekable and countable)?
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* @var bool
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*/
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private $buffered;
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/**
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* Connects to a database
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*
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* @return void
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* @throws DibiException
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*/
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public function connect(array &$config)
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{
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if (!extension_loaded('mysql')) {
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throw new DibiException("PHP extension 'mysql' is not loaded");
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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($config, 'options');
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// default values
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if (!isset($config['username'])) $config['username'] = ini_get('mysql.default_user');
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if (!isset($config['password'])) $config['password'] = ini_get('mysql.default_password');
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if (!isset($config['host'])) {
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$host = ini_get('mysql.default_host');
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if ($host) {
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$config['host'] = $host;
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$config['port'] = ini_get('mysql.default_port');
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} else {
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if (!isset($config['socket'])) $config['socket'] = ini_get('mysql.default_socket');
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$config['host'] = NULL;
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}
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}
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if (empty($config['socket'])) {
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$host = $config['host'] . (empty($config['port']) ? '' : ':' . $config['port']);
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} else {
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$host = ':' . $config['socket'];
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}
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DibiDatabaseException::catchError();
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if (empty($config['persistent'])) {
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$this->connection = @mysql_connect($host, $config['username'], $config['password'], TRUE, $config['options']);
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} else {
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$this->connection = @mysql_pconnect($host, $config['username'], $config['password'], $config['options']);
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}
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DibiDatabaseException::restore();
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if (!is_resource($this->connection)) {
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throw new DibiDatabaseException(mysql_error(), mysql_errno());
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}
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if (isset($config['charset'])) {
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@mysql_query("SET NAMES '" . $config['charset'] . "'", $this->connection);
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// don't handle this error...
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}
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if (isset($config['database']) && !@mysql_select_db($config['database'], $this->connection)) {
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throw new DibiDatabaseException(mysql_error($this->connection), mysql_errno($this->connection));
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}
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$this->buffered = empty($config['unbuffered']);
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}
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/**
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* Disconnects from a database
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*
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* @return void
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*/
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public function disconnect()
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{
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mysql_close($this->connection);
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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 DibiDatabaseException
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*/
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public function query($sql)
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{
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if ($this->buffered) {
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$this->resultset = @mysql_query($sql, $this->connection);
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} else {
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$this->resultset = @mysql_unbuffered_query($sql, $this->connection);
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}
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if ($errno = mysql_errno($this->connection)) {
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throw new DibiDatabaseException(mysql_error($this->connection), $errno, $sql);
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}
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return is_resource($this->resultset);
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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 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 mysql_affected_rows($this->connection);
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}
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/**
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* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query
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*
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* @return int|FALSE int on success or FALSE on failure
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*/
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public function insertId($sequence)
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{
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return mysql_insert_id($this->connection);
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}
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/**
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* Begins a transaction (if supported).
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* @return void
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*/
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public function begin()
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{
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$this->query('BEGIN');
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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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*/
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public function commit()
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{
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$this->query('COMMIT');
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}
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/**
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* Rollback changes in a transaction.
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* @return void
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*/
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public function rollback()
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{
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$this->query('ROLLBACK');
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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 "'" . mysql_real_escape_string($value, $this->connection) . "'";
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if ($type === dibi::IDENTIFIER) return '`' . str_replace('.', '`.`', $value) . '`';
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if ($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, $offset)
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{
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if ($limit < 0 && $offset < 1) return;
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// see http://dev.mysql.com/doc/refman/5.0/en/select.html
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$sql .= ' LIMIT ' . ($limit < 0 ? '18446744073709551615' : (int) $limit)
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. ($offset > 0 ? ' OFFSET ' . (int) $offset : '');
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}
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/**
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* Returns the number of rows in a result set
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*
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* @return int
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*/
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public function rowCount()
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{
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if (!$this->buffered) {
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throw new DibiDatabaseException('Row count is not available for unbuffered queries');
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}
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return mysql_num_rows($this->resultset);
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}
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/**
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* Fetches the row at current position and moves the internal cursor to the next position
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* internal usage only
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*
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* @return array|FALSE array on success, FALSE if no next record
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*/
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public function fetch()
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{
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return mysql_fetch_assoc($this->resultset);
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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 void
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* @throws DibiException
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*/
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public function seek($row)
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{
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if (!$this->buffered) {
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throw new DibiDatabaseException('Cannot seek an unbuffered result set');
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}
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if (!mysql_data_seek($this->resultset, $row)) {
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throw new DibiDatabaseException('Unable to seek to row ' . $row);
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}
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}
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/**
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* Frees the resources allocated for this result set
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*
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* @return void
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*/
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public function free()
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{
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mysql_free_result($this->resultset);
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}
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/** this is experimental */
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public function buildMeta()
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{
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static $types = array(
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'ENUM' => dibi::FIELD_TEXT, // eventually dibi::FIELD_INTEGER
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'SET' => dibi::FIELD_TEXT, // eventually dibi::FIELD_INTEGER
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'CHAR' => dibi::FIELD_TEXT,
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'VARCHAR' => dibi::FIELD_TEXT,
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'STRING' => dibi::FIELD_TEXT,
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'TINYTEXT' => dibi::FIELD_TEXT,
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'TEXT' => dibi::FIELD_TEXT,
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'MEDIUMTEXT'=> dibi::FIELD_TEXT,
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'LONGTEXT' => dibi::FIELD_TEXT,
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'BINARY' => dibi::FIELD_BINARY,
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'VARBINARY' => dibi::FIELD_BINARY,
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'TINYBLOB' => dibi::FIELD_BINARY,
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'BLOB' => dibi::FIELD_BINARY,
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'MEDIUMBLOB'=> dibi::FIELD_BINARY,
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'LONGBLOB' => dibi::FIELD_BINARY,
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'DATE' => dibi::FIELD_DATE,
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'DATETIME' => dibi::FIELD_DATETIME,
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'TIMESTAMP' => dibi::FIELD_DATETIME,
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'TIME' => dibi::FIELD_DATETIME,
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'BIT' => dibi::FIELD_BOOL,
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'YEAR' => dibi::FIELD_INTEGER,
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'TINYINT' => dibi::FIELD_INTEGER,
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'SMALLINT' => dibi::FIELD_INTEGER,
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'MEDIUMINT' => dibi::FIELD_INTEGER,
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'INT' => dibi::FIELD_INTEGER,
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'INTEGER' => dibi::FIELD_INTEGER,
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'BIGINT' => dibi::FIELD_INTEGER,
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'FLOAT' => dibi::FIELD_FLOAT,
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'DOUBLE' => dibi::FIELD_FLOAT,
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'REAL' => dibi::FIELD_FLOAT,
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'DECIMAL' => dibi::FIELD_FLOAT,
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'NUMERIC' => dibi::FIELD_FLOAT,
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);
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$count = mysql_num_fields($this->resultset);
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$meta = array();
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for ($index = 0; $index < $count; $index++) {
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$info['native'] = $native = strtoupper(mysql_field_type($this->resultset, $index));
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$info['flags'] = explode(' ', mysql_field_flags($this->resultset, $index));
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$info['length'] = mysql_field_len($this->resultset, $index);
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$info['table'] = mysql_field_table($this->resultset, $index);
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if (in_array('auto_increment', $info['flags'])) { // or 'primary_key' ?
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$info['type'] = dibi::FIELD_COUNTER;
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} else {
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$info['type'] = isset($types[$native]) ? $types[$native] : dibi::FIELD_UNKNOWN;
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// if ($info['type'] === dibi::FIELD_TEXT && $info['length'] > 255)
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// $info['type'] = dibi::FIELD_LONG_TEXT;
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}
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$name = mysql_field_name($this->resultset, $index);
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$meta[$name] = $info;
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}
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return $meta;
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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 mixed
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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 mixed
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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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