511 lines
15 KiB
PHP
511 lines
15 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* The PEAR DB driver for PHP's dbase extension
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* for interacting with dBase databases
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*
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* PHP version 5
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*
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* LICENSE: This source file is subject to version 3.0 of the PHP license
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* that is available through the world-wide-web at the following URI:
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* http://www.php.net/license/3_0.txt. If you did not receive a copy of
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* the PHP License and are unable to obtain it through the web, please
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* send a note to license@php.net so we can mail you a copy immediately.
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*
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* @category Database
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* @package DB
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* @author Tomas V.V. Cox <cox@idecnet.com>
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* @author Daniel Convissor <danielc@php.net>
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* @copyright 1997-2007 The PHP Group
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* @license http://www.php.net/license/3_0.txt PHP License 3.0
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* @version CVS: $Id$
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* @link http://pear.php.net/package/DB
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*/
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/**
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* Obtain the DB_common class so it can be extended from
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*/
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require_once 'DB/common.php';
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/**
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* The methods PEAR DB uses to interact with PHP's dbase extension
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* for interacting with dBase databases
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*
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* These methods overload the ones declared in DB_common.
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*
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* @category Database
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* @package DB
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* @author Tomas V.V. Cox <cox@idecnet.com>
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* @author Daniel Convissor <danielc@php.net>
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* @copyright 1997-2007 The PHP Group
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* @license http://www.php.net/license/3_0.txt PHP License 3.0
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* @version Release: 1.9.2
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* @link http://pear.php.net/package/DB
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*/
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class DB_dbase extends DB_common
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{
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// {{{ properties
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/**
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* The DB driver type (mysql, oci8, odbc, etc.)
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* @var string
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*/
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var $phptype = 'dbase';
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/**
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* The database syntax variant to be used (db2, access, etc.), if any
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* @var string
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*/
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var $dbsyntax = 'dbase';
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/**
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* The capabilities of this DB implementation
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*
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* The 'new_link' element contains the PHP version that first provided
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* new_link support for this DBMS. Contains false if it's unsupported.
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*
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* Meaning of the 'limit' element:
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* + 'emulate' = emulate with fetch row by number
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* + 'alter' = alter the query
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* + false = skip rows
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*
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* @var array
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*/
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var $features = array(
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'limit' => false,
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'new_link' => false,
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'numrows' => true,
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'pconnect' => false,
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'prepare' => false,
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'ssl' => false,
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'transactions' => false,
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);
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/**
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* A mapping of native error codes to DB error codes
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* @var array
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*/
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var $errorcode_map = array(
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);
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/**
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* The raw database connection created by PHP
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* @var resource
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*/
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var $connection;
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/**
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* The DSN information for connecting to a database
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* @var array
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*/
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var $dsn = array();
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/**
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* A means of emulating result resources
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* @var array
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*/
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var $res_row = array();
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/**
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* The quantity of results so far
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*
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* For emulating result resources.
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*
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* @var integer
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*/
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var $result = 0;
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/**
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* Maps dbase data type id's to human readable strings
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*
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* The human readable values are based on the output of PHP's
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* dbase_get_header_info() function.
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*
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* @var array
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* @since Property available since Release 1.7.0
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*/
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var $types = array(
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'C' => 'character',
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'D' => 'date',
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'L' => 'boolean',
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'M' => 'memo',
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'N' => 'number',
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);
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// }}}
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// {{{ constructor
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/**
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* This constructor calls <kbd>parent::__construct()</kbd>
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*
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* @return void
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*/
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function __construct()
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{
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parent::__construct();
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}
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// }}}
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// {{{ connect()
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/**
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* Connect to the database and create it if it doesn't exist
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*
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* Don't call this method directly. Use DB::connect() instead.
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*
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* PEAR DB's dbase driver supports the following extra DSN options:
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* + mode An integer specifying the read/write mode to use
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* (0 = read only, 1 = write only, 2 = read/write).
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* Available since PEAR DB 1.7.0.
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* + fields An array of arrays that PHP's dbase_create() function needs
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* to create a new database. This information is used if the
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* dBase file specified in the "database" segment of the DSN
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* does not exist. For more info, see the PHP manual's
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* {@link http://php.net/dbase_create dbase_create()} page.
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* Available since PEAR DB 1.7.0.
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*
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* Example of how to connect and establish a new dBase file if necessary:
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* <code>
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* require_once 'DB.php';
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*
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* $dsn = array(
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* 'phptype' => 'dbase',
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* 'database' => '/path/and/name/of/dbase/file',
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* 'mode' => 2,
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* 'fields' => array(
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* array('a', 'N', 5, 0),
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* array('b', 'C', 40),
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* array('c', 'C', 255),
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* array('d', 'C', 20),
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* ),
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* );
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* $options = array(
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* 'debug' => 2,
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* 'portability' => DB_PORTABILITY_ALL,
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* );
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*
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* $db = DB::connect($dsn, $options);
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* if (PEAR::isError($db)) {
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* die($db->getMessage());
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* }
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* </code>
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*
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* @param array $dsn the data source name
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* @param bool $persistent should the connection be persistent?
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*
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* @return int DB_OK on success. A DB_Error object on failure.
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*/
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function connect($dsn, $persistent = false)
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{
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if (!PEAR::loadExtension('dbase')) {
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return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
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}
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$this->dsn = $dsn;
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if ($dsn['dbsyntax']) {
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$this->dbsyntax = $dsn['dbsyntax'];
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}
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/*
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* Turn track_errors on for entire script since $php_errormsg
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* is the only way to find errors from the dbase extension.
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*/
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@ini_set('track_errors', 1);
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$php_errormsg = '';
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if (!file_exists($dsn['database'])) {
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$this->dsn['mode'] = 2;
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if (empty($dsn['fields']) || !is_array($dsn['fields'])) {
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return $this->raiseError(DB_ERROR_CONNECT_FAILED,
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null, null, null,
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'the dbase file does not exist and '
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. 'it could not be created because '
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. 'the "fields" element of the DSN '
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. 'is not properly set');
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}
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$this->connection = @dbase_create($dsn['database'],
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$dsn['fields']);
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if (!$this->connection) {
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return $this->raiseError(DB_ERROR_CONNECT_FAILED,
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null, null, null,
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'the dbase file does not exist and '
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. 'the attempt to create it failed: '
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. $php_errormsg);
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}
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} else {
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if (!isset($this->dsn['mode'])) {
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$this->dsn['mode'] = 0;
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}
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$this->connection = @dbase_open($dsn['database'],
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$this->dsn['mode']);
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if (!$this->connection) {
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return $this->raiseError(DB_ERROR_CONNECT_FAILED,
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null, null, null,
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$php_errormsg);
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}
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}
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return DB_OK;
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}
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// }}}
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// {{{ disconnect()
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/**
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* Disconnects from the database server
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*
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* @return bool TRUE on success, FALSE on failure
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*/
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function disconnect()
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{
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$ret = @dbase_close($this->connection);
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$this->connection = null;
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return $ret;
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}
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// }}}
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// {{{ &query()
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function &query($query = null)
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{
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// emulate result resources
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$this->res_row[(int)$this->result] = 0;
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$tmp = new DB_result($this, $this->result++);
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return $tmp;
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}
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// }}}
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// {{{ fetchInto()
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/**
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* Places a row from the result set into the given array
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*
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* Formating of the array and the data therein are configurable.
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* See DB_result::fetchInto() for more information.
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*
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* This method is not meant to be called directly. Use
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* DB_result::fetchInto() instead. It can't be declared "protected"
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* because DB_result is a separate object.
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*
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* @param resource $result the query result resource
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* @param array $arr the referenced array to put the data in
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* @param int $fetchmode how the resulting array should be indexed
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* @param int $rownum the row number to fetch (0 = first row)
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*
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* @return mixed DB_OK on success, NULL when the end of a result set is
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* reached or on failure
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*
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* @see DB_result::fetchInto()
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*/
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function fetchInto($result, &$arr, $fetchmode, $rownum = null)
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{
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if ($rownum === null) {
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$rownum = $this->res_row[(int)$result]++;
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}
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if ($fetchmode & DB_FETCHMODE_ASSOC) {
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$arr = @dbase_get_record_with_names($this->connection, $rownum);
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if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
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$arr = array_change_key_case($arr, CASE_LOWER);
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}
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} else {
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$arr = @dbase_get_record($this->connection, $rownum);
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}
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if (!$arr) {
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return null;
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}
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if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
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$this->_rtrimArrayValues($arr);
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}
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if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
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$this->_convertNullArrayValuesToEmpty($arr);
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}
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return DB_OK;
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}
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// }}}
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// {{{ freeResult()
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/**
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* Deletes the result set and frees the memory occupied by the result set.
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*
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* This method is a no-op for dbase, as there aren't result resources in
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* the same sense as most other database backends.
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*
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* @param resource $result PHP's query result resource
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*
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* @return bool TRUE on success, FALSE if $result is invalid
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*
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* @see DB_result::free()
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*/
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function freeResult($result)
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{
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return true;
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}
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// }}}
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// {{{ numCols()
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/**
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* Gets the number of columns in a result set
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*
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* This method is not meant to be called directly. Use
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* DB_result::numCols() instead. It can't be declared "protected"
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* because DB_result is a separate object.
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*
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* @param resource $result PHP's query result resource
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*
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* @return int the number of columns. A DB_Error object on failure.
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*
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* @see DB_result::numCols()
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*/
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function numCols($foo)
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{
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return @dbase_numfields($this->connection);
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}
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// }}}
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// {{{ numRows()
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/**
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* Gets the number of rows in a result set
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*
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* This method is not meant to be called directly. Use
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* DB_result::numRows() instead. It can't be declared "protected"
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* because DB_result is a separate object.
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*
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* @param resource $result PHP's query result resource
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*
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* @return int the number of rows. A DB_Error object on failure.
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*
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* @see DB_result::numRows()
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*/
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function numRows($foo)
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{
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return @dbase_numrecords($this->connection);
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}
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// }}}
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// {{{ quoteBoolean()
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/**
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* Formats a boolean value for use within a query in a locale-independent
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* manner.
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*
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* @param boolean the boolean value to be quoted.
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* @return string the quoted string.
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* @see DB_common::quoteSmart()
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* @since Method available since release 1.7.8.
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*/
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function quoteBoolean($boolean) {
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return $boolean ? 'T' : 'F';
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}
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// }}}
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// {{{ tableInfo()
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/**
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* Returns information about the current database
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*
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* @param mixed $result THIS IS UNUSED IN DBASE. The current database
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* is examined regardless of what is provided here.
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* @param int $mode a valid tableInfo mode
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*
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* @return array an associative array with the information requested.
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* A DB_Error object on failure.
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*
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* @see DB_common::tableInfo()
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* @since Method available since Release 1.7.0
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*/
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function tableInfo($result = null, $mode = null)
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{
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if (function_exists('dbase_get_header_info')) {
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$id = @dbase_get_header_info($this->connection);
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if (!$id && $php_errormsg) {
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return $this->raiseError(DB_ERROR,
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null, null, null,
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$php_errormsg);
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}
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} else {
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/*
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* This segment for PHP 4 is loosely based on code by
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* Hadi Rusiah <deegos@yahoo.com> in the comments on
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* the dBase reference page in the PHP manual.
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*/
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$db = @fopen($this->dsn['database'], 'r');
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if (!$db) {
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return $this->raiseError(DB_ERROR_CONNECT_FAILED,
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null, null, null,
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$php_errormsg);
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}
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$id = array();
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$i = 0;
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$line = fread($db, 32);
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while (!feof($db)) {
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$line = fread($db, 32);
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if (substr($line, 0, 1) == chr(13)) {
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break;
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} else {
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$pos = strpos(substr($line, 0, 10), chr(0));
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$pos = ($pos == 0 ? 10 : $pos);
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$id[$i] = array(
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'name' => substr($line, 0, $pos),
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'type' => $this->types[substr($line, 11, 1)],
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'length' => ord(substr($line, 16, 1)),
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'precision' => ord(substr($line, 17, 1)),
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);
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}
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$i++;
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}
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fclose($db);
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}
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if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
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$case_func = 'strtolower';
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} else {
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$case_func = 'strval';
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}
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$res = array();
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$count = count($id);
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if ($mode) {
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$res['num_fields'] = $count;
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}
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for ($i = 0; $i < $count; $i++) {
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$res[$i] = array(
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'table' => $this->dsn['database'],
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'name' => $case_func($id[$i]['name']),
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'type' => $id[$i]['type'],
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'len' => $id[$i]['length'],
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'flags' => ''
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);
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if ($mode & DB_TABLEINFO_ORDER) {
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$res['order'][$res[$i]['name']] = $i;
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}
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if ($mode & DB_TABLEINFO_ORDERTABLE) {
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$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
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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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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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*/
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?>
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