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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**

 * The PEAR DB driver for PHP's dbase extension

 * for interacting with dBase databases

 *

 * PHP version 5

 *

 * LICENSE: This source file is subject to version 3.0 of the PHP license

 * that is available through the world-wide-web at the following URI:

 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of

 * the PHP License and are unable to obtain it through the web, please

 * send a note to license@php.net so we can mail you a copy immediately.

 *

 * @category   Database

 * @package    DB

 * @author     Tomas V.V. Cox <cox@idecnet.com>

 * @author     Daniel Convissor <danielc@php.net>

 * @copyright  1997-2007 The PHP Group

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    CVS: $Id$

 * @link       http://pear.php.net/package/DB

 */

/**

 * Obtain the DB_common class so it can be extended from

 */

require_once 'DB/common.php';

/**

 * The methods PEAR DB uses to interact with PHP's dbase extension

 * for interacting with dBase databases

 *

 * These methods overload the ones declared in DB_common.

 *

 * @category   Database

 * @package    DB

 * @author     Tomas V.V. Cox <cox@idecnet.com>

 * @author     Daniel Convissor <danielc@php.net>

 * @copyright  1997-2007 The PHP Group

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    Release: 1.9.2

 * @link       http://pear.php.net/package/DB

 */

class DB_dbase extends DB_common

{

    // {{{ properties

    /**

     * The DB driver type (mysql, oci8, odbc, etc.)

     * @var string

     */

    var $phptype = 'dbase';

    /**

     * The database syntax variant to be used (db2, access, etc.), if any

     * @var string

     */

    var $dbsyntax = 'dbase';

    /**

     * The capabilities of this DB implementation

     *

     * The 'new_link' element contains the PHP version that first provided

     * new_link support for this DBMS.  Contains false if it's unsupported.

     *

     * Meaning of the 'limit' element:

     *   + 'emulate' = emulate with fetch row by number

     *   + 'alter'   = alter the query

     *   + false     = skip rows

     *

     * @var array

     */

    var $features = array(

        'limit'         => false,

        'new_link'      => false,

        'numrows'       => true,

        'pconnect'      => false,

        'prepare'       => false,

        'ssl'           => false,

        'transactions'  => false,

    );

    /**

     * A mapping of native error codes to DB error codes

     * @var array

     */

    var $errorcode_map = array(

    );

    /**

     * The raw database connection created by PHP

     * @var resource

     */

    var $connection;

    /**

     * The DSN information for connecting to a database

     * @var array

     */

    var $dsn = array();

    /**

     * A means of emulating result resources

     * @var array

     */

    var $res_row = array();

    /**

     * The quantity of results so far

     *

     * For emulating result resources.

     *

     * @var integer

     */

    var $result = 0;

    /**

     * Maps dbase data type id's to human readable strings

     *

     * The human readable values are based on the output of PHP's

     * dbase_get_header_info() function.

     *

     * @var array

     * @since Property available since Release 1.7.0

     */

    var $types = array(

        'C' => 'character',

        'D' => 'date',

        'L' => 'boolean',

        'M' => 'memo',

        'N' => 'number',

    );

    // }}}

    // {{{ constructor

    /**

     * This constructor calls <kbd>parent::__construct()</kbd>

     *

     * @return void

     */

    function __construct()

    {

        parent::__construct();

    }

    // }}}

    // {{{ connect()

    /**

     * Connect to the database and create it if it doesn't exist

     *

     * Don't call this method directly.  Use DB::connect() instead.

     *

     * PEAR DB's dbase driver supports the following extra DSN options:

     *   + mode    An integer specifying the read/write mode to use

     *              (0 = read only, 1 = write only, 2 = read/write).

     *              Available since PEAR DB 1.7.0.

     *   + fields  An array of arrays that PHP's dbase_create() function needs

     *              to create a new database.  This information is used if the

     *              dBase file specified in the "database" segment of the DSN

     *              does not exist.  For more info, see the PHP manual's

     *              {@link http://php.net/dbase_create dbase_create()} page.

     *              Available since PEAR DB 1.7.0.

     *

     * Example of how to connect and establish a new dBase file if necessary:

     * <code>

     * require_once 'DB.php';

     *

     * $dsn = array(

     *     'phptype'  => 'dbase',

     *     'database' => '/path/and/name/of/dbase/file',

     *     'mode'     => 2,

     *     'fields'   => array(

     *         array('a', 'N', 5, 0),

     *         array('b', 'C', 40),

     *         array('c', 'C', 255),

     *         array('d', 'C', 20),

     *     ),

     * );

     * $options = array(

     *     'debug'       => 2,

     *     'portability' => DB_PORTABILITY_ALL,

     * );

     *

     * $db = DB::connect($dsn, $options);

     * if (PEAR::isError($db)) {

     *     die($db->getMessage());

     * }

     * </code>

     *

     * @param array $dsn         the data source name

     * @param bool  $persistent  should the connection be persistent?

     *

     * @return int  DB_OK on success. A DB_Error object on failure.

     */

    function connect($dsn, $persistent = false)

    {

        if (!PEAR::loadExtension('dbase')) {

            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        }

        $this->dsn = $dsn;

        if ($dsn['dbsyntax']) {

            $this->dbsyntax = $dsn['dbsyntax'];

        }

        /*

         * Turn track_errors on for entire script since $php_errormsg

         * is the only way to find errors from the dbase extension.

         */

        @ini_set('track_errors', 1);

        $php_errormsg = '';

        if (!file_exists($dsn['database'])) {

            $this->dsn['mode'] = 2;

            if (empty($dsn['fields']) || !is_array($dsn['fields'])) {

                return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                         null, null, null,

                                         'the dbase file does not exist and '

                                         . 'it could not be created because '

                                         . 'the "fields" element of the DSN '

                                         . 'is not properly set');

            }

            $this->connection = @dbase_create($dsn['database'],

                                              $dsn['fields']);

            if (!$this->connection) {

                return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                         null, null, null,

                                         'the dbase file does not exist and '

                                         . 'the attempt to create it failed: '

                                         . $php_errormsg);

            }

        } else {

            if (!isset($this->dsn['mode'])) {

                $this->dsn['mode'] = 0;

            }

            $this->connection = @dbase_open($dsn['database'],

                                            $this->dsn['mode']);

            if (!$this->connection) {

                return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                         null, null, null,

                                         $php_errormsg);

            }

        }

        return DB_OK;

    }

    // }}}

    // {{{ disconnect()

    /**

     * Disconnects from the database server

     *

     * @return bool  TRUE on success, FALSE on failure

     */

    function disconnect()

    {

        $ret = @dbase_close($this->connection);

        $this->connection = null;

        return $ret;

    }

    // }}}

    // {{{ &query()

    function &query($query = null)

    {

        // emulate result resources

        $this->res_row[(int)$this->result] = 0;

        $tmp = new DB_result($this, $this->result++);

        return $tmp;

    }

    // }}}

    // {{{ fetchInto()

    /**

     * Places a row from the result set into the given array

     *

     * Formating of the array and the data therein are configurable.

     * See DB_result::fetchInto() for more information.

     *

     * This method is not meant to be called directly.  Use

     * DB_result::fetchInto() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result    the query result resource

     * @param array    $arr       the referenced array to put the data in

     * @param int      $fetchmode how the resulting array should be indexed

     * @param int      $rownum    the row number to fetch (0 = first row)

     *

     * @return mixed  DB_OK on success, NULL when the end of a result set is

     *                 reached or on failure

     *

     * @see DB_result::fetchInto()

     */

    function fetchInto($result, &$arr, $fetchmode, $rownum = null)

    {

        if ($rownum === null) {

            $rownum = $this->res_row[(int)$result]++;

        }

        if ($fetchmode & DB_FETCHMODE_ASSOC) {

            $arr = @dbase_get_record_with_names($this->connection, $rownum);

            if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {

                $arr = array_change_key_case($arr, CASE_LOWER);

            }

        } else {

            $arr = @dbase_get_record($this->connection, $rownum);

        }

        if (!$arr) {

            return null;

        }

        if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {

            $this->_rtrimArrayValues($arr);

        }

        if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {

            $this->_convertNullArrayValuesToEmpty($arr);

        }

        return DB_OK;

    }

    // }}}

    // {{{ freeResult()

    /**

     * Deletes the result set and frees the memory occupied by the result set.

     *

     * This method is a no-op for dbase, as there aren't result resources in

     * the same sense as most other database backends.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return bool  TRUE on success, FALSE if $result is invalid

     *

     * @see DB_result::free()

     */

    function freeResult($result)

    {

        return true;

    }

    // }}}

    // {{{ numCols()

    /**

     * Gets the number of columns in a result set

     *

     * This method is not meant to be called directly.  Use

     * DB_result::numCols() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return int  the number of columns.  A DB_Error object on failure.

     *

     * @see DB_result::numCols()

     */

    function numCols($foo)

    {

        return @dbase_numfields($this->connection);

    }

    // }}}

    // {{{ numRows()

    /**

     * Gets the number of rows in a result set

     *

     * This method is not meant to be called directly.  Use

     * DB_result::numRows() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return int  the number of rows.  A DB_Error object on failure.

     *

     * @see DB_result::numRows()

     */

    function numRows($foo)

    {

        return @dbase_numrecords($this->connection);

    }

    // }}}

    // {{{ quoteBoolean()

    /**

     * Formats a boolean value for use within a query in a locale-independent

     * manner.

     *

     * @param boolean the boolean value to be quoted.

     * @return string the quoted string.

     * @see DB_common::quoteSmart()

     * @since Method available since release 1.7.8.

     */

    function quoteBoolean($boolean) {

        return $boolean ? 'T' : 'F';

    }

    // }}}

    // {{{ tableInfo()

    /**

     * Returns information about the current database

     *

     * @param mixed $result  THIS IS UNUSED IN DBASE.  The current database

     *                       is examined regardless of what is provided here.

     * @param int   $mode    a valid tableInfo mode

     *

     * @return array  an associative array with the information requested.

     *                 A DB_Error object on failure.

     *

     * @see DB_common::tableInfo()

     * @since Method available since Release 1.7.0

     */

    function tableInfo($result = null, $mode = null)

    {

        if (function_exists('dbase_get_header_info')) {

            $id = @dbase_get_header_info($this->connection);

            if (!$id && $php_errormsg) {

                return $this->raiseError(DB_ERROR,

                                         null, null, null,

                                         $php_errormsg);

            }

        } else {

            /*

             * This segment for PHP 4 is loosely based on code by

             * Hadi Rusiah <deegos@yahoo.com> in the comments on

             * the dBase reference page in the PHP manual.

             */

            $db = @fopen($this->dsn['database'], 'r');

            if (!$db) {

                return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                         null, null, null,

                                         $php_errormsg);

            }

            $id = array();

            $i  = 0;

            $line = fread($db, 32);

            while (!feof($db)) {

                $line = fread($db, 32);

                if (substr($line, 0, 1) == chr(13)) {

                    break;

                } else {

                    $pos = strpos(substr($line, 0, 10), chr(0));

                    $pos = ($pos == 0 ? 10 : $pos);

                    $id[$i] = array(

                        'name'   => substr($line, 0, $pos),

                        'type'   => $this->types[substr($line, 11, 1)],

                        'length' => ord(substr($line, 16, 1)),

                        'precision' => ord(substr($line, 17, 1)),

                    );

                }

                $i++;

            }

            fclose($db);

        }

        if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {

            $case_func = 'strtolower';

        } else {

            $case_func = 'strval';

        }

        $res   = array();

        $count = count($id);

        if ($mode) {

            $res['num_fields'] = $count;

        }

        for ($i = 0; $i < $count; $i++) {

            $res[$i] = array(

                'table' => $this->dsn['database'],

                'name'  => $case_func($id[$i]['name']),

                'type'  => $id[$i]['type'],

                'len'   => $id[$i]['length'],

                'flags' => ''

            );

            if ($mode & DB_TABLEINFO_ORDER) {

                $res['order'][$res[$i]['name']] = $i;

            }

            if ($mode & DB_TABLEINFO_ORDERTABLE) {

                $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;

            }

        }

        return $res;

    }

    // }}}

}

/*

 * Local variables:

 * tab-width: 4

 * c-basic-offset: 4

 * End:

 */

?>