mirror of
https://github.com/dg/dibi.git
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388 lines
11 KiB
PHP
388 lines
11 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 via improved extension
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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 (MYSQLI_*)
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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 DibiMySqliDriver extends NObject implements DibiDriverInterface
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{
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/**
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* Connection resource
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* @var mysqli
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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 mysqli_result
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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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DibiConnection::alias($config, 'username', 'user');
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DibiConnection::alias($config, 'password', 'pass');
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DibiConnection::alias($config, 'options');
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DibiConnection::alias($config, 'database');
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// default values
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if (!isset($config['username'])) $config['username'] = ini_get('mysqli.default_user');
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if (!isset($config['password'])) $config['password'] = ini_get('mysqli.default_password');
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if (!isset($config['socket'])) $config['socket'] = ini_get('mysqli.default_socket');
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if (!isset($config['host'])) {
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$config['host'] = ini_get('mysqli.default_host');
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if (!isset($config['port'])) ini_get('mysqli.default_port');
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if (!isset($config['host'])) $config['host'] = 'localhost';
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}
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if (!extension_loaded('mysqli')) {
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throw new DibiException("PHP extension 'mysqli' is not loaded");
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}
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$this->connection = mysqli_init();
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@mysqli_real_connect($this->connection, $config['host'], $config['username'], $config['password'], $config['database'], $config['port'], $config['socket'], $config['options']);
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if ($errno = mysqli_connect_errno()) {
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throw new DibiDriverException(mysqli_connect_error(), $errno);
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}
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if (isset($config['charset'])) {
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mysqli_query($this->connection, "SET NAMES '" . $config['charset'] . "'");
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}
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$this->buffered = empty($config['unbuffered']);
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}
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/**
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* Disconnects from a database
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*
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* @return void
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*/
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public function disconnect()
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{
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mysqli_close($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 DibiDriverException
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*/
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public function query($sql)
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{
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$this->resultset = @mysqli_query($this->connection, $sql, $this->buffered ? MYSQLI_STORE_RESULT : MYSQLI_USE_RESULT);
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if ($errno = mysqli_errno($this->connection)) {
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throw new DibiDriverException(mysqli_error($this->connection), $errno, $sql);
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}
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return is_object($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 mysqli_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 mysqli_insert_id($this->connection);
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}
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/**
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* Begins a transaction (if supported).
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* @return void
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*/
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public function begin()
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{
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if (!mysqli_autocommit($this->connection, FALSE)) {
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throw new DibiDriverException(mysqli_error($this->connection), mysqli_errno($this->connection));
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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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*/
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public function commit()
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{
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if (!mysqli_commit($this->connection)) {
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throw new DibiDriverException(mysqli_error($this->connection), mysqli_errno($this->connection));
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}
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mysqli_autocommit($this->connection, TRUE);
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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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if (!mysqli_rollback($this->connection)) {
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throw new DibiDriverException(mysqli_error($this->connection), mysqli_errno($this->connection));
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}
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mysqli_autocommit($this->connection, TRUE);
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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 "'" . mysqli_real_escape_string($this->connection, $value) . "'";
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if ($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 DibiDriverException('Row count is not available for unbuffered queries');
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}
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return mysqli_num_rows($this->resultset);
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}
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/**
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* Fetches the row at current position and moves the internal cursor to the next position
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* internal usage only
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*
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* @return array|FALSE array on success, FALSE if no next record
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*/
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public function fetch()
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{
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return mysqli_fetch_assoc($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 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($row)
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{
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if (!$this->buffered) {
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throw new DibiDriverException('Cannot seek an unbuffered result set');
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}
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return mysqli_data_seek($this->resultset, $row);
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}
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/**
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* Frees the resources allocated for this result set
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*
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* @return void
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*/
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public function free()
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{
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mysqli_free_result($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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MYSQLI_TYPE_FLOAT => dibi::FIELD_FLOAT,
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MYSQLI_TYPE_DOUBLE => dibi::FIELD_FLOAT,
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MYSQLI_TYPE_DECIMAL => dibi::FIELD_FLOAT,
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// MYSQLI_TYPE_NEWDECIMAL=> dibi::FIELD_FLOAT,
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// MYSQLI_TYPE_BIT => dibi::FIELD_INTEGER,
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MYSQLI_TYPE_TINY => dibi::FIELD_INTEGER,
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MYSQLI_TYPE_SHORT => dibi::FIELD_INTEGER,
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MYSQLI_TYPE_LONG => dibi::FIELD_INTEGER,
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MYSQLI_TYPE_LONGLONG => dibi::FIELD_INTEGER,
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MYSQLI_TYPE_INT24 => dibi::FIELD_INTEGER,
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MYSQLI_TYPE_YEAR => dibi::FIELD_INTEGER,
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MYSQLI_TYPE_GEOMETRY => dibi::FIELD_INTEGER,
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MYSQLI_TYPE_DATE => dibi::FIELD_DATE,
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MYSQLI_TYPE_NEWDATE => dibi::FIELD_DATE,
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MYSQLI_TYPE_TIMESTAMP => dibi::FIELD_DATETIME,
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MYSQLI_TYPE_TIME => dibi::FIELD_DATETIME,
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MYSQLI_TYPE_DATETIME => dibi::FIELD_DATETIME,
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MYSQLI_TYPE_ENUM => dibi::FIELD_TEXT, // eventually dibi::FIELD_INTEGER
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MYSQLI_TYPE_SET => dibi::FIELD_TEXT, // eventually dibi::FIELD_INTEGER
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MYSQLI_TYPE_STRING => dibi::FIELD_TEXT,
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MYSQLI_TYPE_VAR_STRING=> dibi::FIELD_TEXT,
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MYSQLI_TYPE_TINY_BLOB => dibi::FIELD_BINARY,
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MYSQLI_TYPE_MEDIUM_BLOB=> dibi::FIELD_BINARY,
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MYSQLI_TYPE_LONG_BLOB => dibi::FIELD_BINARY,
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MYSQLI_TYPE_BLOB => dibi::FIELD_BINARY,
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);
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$count = mysqli_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 = (array) mysqli_fetch_field_direct($this->resultset, $index);
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$native = $info['native'] = $info['type'];
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if ($info['flags'] & MYSQLI_AUTO_INCREMENT_FLAG) { // 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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// $info['type'] = dibi::FIELD_LONG_TEXT;
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}
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$meta[$info['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 mysqli
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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 mysqli_result
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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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