querysim.php

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<?php
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox,                 |
// | Stig. S. Bakken, Lukas Smith                                         |
// | All rights reserved.                                                 |
// +----------------------------------------------------------------------+
// | MDB is a merge of PEAR DB and Metabases that provides a unified DB   |
// | API as well as database abstraction for PHP applications.            |
// | This LICENSE is in the BSD license style.                            |
// |                                                                      |
// | Redistribution and use in source and binary forms, with or without   |
// | modification, are permitted provided that the following conditions   |
// | are met:                                                             |
// |                                                                      |
// | Redistributions of source code must retain the above copyright       |
// | notice, this list of conditions and the following disclaimer.        |
// |                                                                      |
// | Redistributions in binary form must reproduce the above copyright    |
// | notice, this list of conditions and the following disclaimer in the  |
// | documentation and/or other materials provided with the distribution. |
// |                                                                      |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken,    |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission.                                                  |
// |                                                                      |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    |
// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE      |
// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,          |
// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
// |  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  |
// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT          |
// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE          |
// | POSSIBILITY OF SUCH DAMAGE.                                          |
// +----------------------------------------------------------------------+
// | Original QuerySim Concept & ColdFusion Author: Hal Helms             |
// | <[e-mail]>                                          |
// | Bert Dawson <[e-mail]>                                  |
// +----------------------------------------------------------------------+
// | Original PHP Author: Alan Richmond <[e-mail]>           |
// | David Huyck <[e-mail]>                                        |
// +----------------------------------------------------------------------+
// | Special note concerning code documentation:                          |
// | QuerySim was originally created for use during development of        |
// | applications built using the Fusebox framework. (www.fusebox.org)    |
// | Fusebox uses an XML style of documentation called Fusedoc. (Which    |
// | is admittedly not well suited to documenting classes and functions.  |
// | This short-coming is being addressed by the Fusebox community.) PEAR |
// | uses a Javadoc style of documentation called PHPDoc. (www.phpdoc.de) |
// | Since this class extension spans two groups of users, it is asked    |
// | that the members of each respect the documentation standard of the   |
// | other.  So it is a further requirement that both documentation       |
// | standards be included and maintained. If assistance is required      |
// | please contact Alan Richmond.                                        |
// +----------------------------------------------------------------------+
//
// $Id: querysim.php,v 1.6.4.5 2004/02/26 11:51:15 lsmith Exp $
//

/*
<fusedoc fuse="querysim.php" language="PHP">
    <responsibilities>
        I take information and turn it into a recordset that can be accessed
        through the PEAR MDB API.  Based on Hal Helms' QuerySim.cfm ColdFusion
        custom tag available at halhelms.com.
    </responsibilities>
    <properties>
        <property name="API" value="PEAR MDB" />
        <property name="version" value="0.2.1" />
        <property name="status" value="beta" />
        <history author="Hal Helms" email="[e-mail]" type="Create" />
        <history author="Bert Dawson" email="[e-mail]" type="Update">
            Extensive revision that is backwardly compatible but eliminates the
            need for a separate .sim file.
        </history>
        <history author="Alan Richmond" email="[e-mail]" type="Create" date="10-July-2002">
            Rewrote in PHP as an extention to the PEAR DB API.
            Functions supported:
                connect, disconnect, query, fetchRow, fetchInto, freeResult,
                numCols, numRows, getSpecialQuery
            David Huyck (bombusbee.com) added ability to escape special
                characters (i.e., delimiters) using a '\'.
            Extended PEAR DB options[] for adding incoming parameters.  Added
                options:  columnDelim, dataDelim, eolDelim
        </history>
        <history author="David Huyck" email="[e-mail]" type="Update" date="19-July-2002">
            Added the ability to set the QuerySim options at runtime.
            Default options are:
                'columnDelim' => ',',            // Commas split the column names
                'dataDelim'   => '|',            // Pipes split the data fields
                'eolDelim'    => chr(13).chr(10) // Carriage returns split the
                                                 // lines of data
            Affected functions are:
                DB_querysim():          set the default options when the
                                        constructor method is called
                _parseQuerySim($query): altered the parsing of lines, column
                                        names, and data fields
                _empty2null:            altered the way this function is called
                                        to simplify calling it
        </history>
        <history author="Alan Richmond" email="[e-mail]" type="Update" date="24-July-2002">
            Added error catching for malformed QuerySim text.
            Bug fix _empty2null():  altered version was returning unmodified
                                    lineData.
            Cleanup:
                PEAR compliant formatting, finished PHPDocs and added 'out' to
                Fusedoc 'io'.
                Broke up _parseQuerySim() into _buildResult() and _parseOnDelim()
                to containerize duplicate parse code.
        </history>
        <history author="David Huyck" email="[e-mail]" type="Update" date="25-July-2002">
            Edited the _buildResult() and _parseOnDelim() functions to improve
            reliability of special character escaping.
            Re-introduced a custom setOption() method to throw an error when a
            person tries to set one of the delimiters to '\'.
        </history>
        <history author="Alan Richmond" email="[e-mail]" type="Update" date="27-July-2002">
            Added '/' delimiter param to preg_quote() in _empty2null() and
            _parseOnDelim() so '/' can be used as a delimiter.
            Added error check for columnDelim == eolDelim or dataDelim == eolDelim.
            Renamed some variables for consistancy.
        </history>
        <history author="Alan Richmond" email="[e-mail]" type="Update" date="30-July-2002">
            Removed private function _empty2null().  Turns out preg_split()
            deals with empty elemants by making them zero length strings, just
            what they ended up being anyway.  This should speed things up a little.
            Affected functions:
                _parseOnDelim()     perform trim on line here, instead of in
                                    _empty2null().
                _buildResult()      remove call to _empty2null().
                _empty2null()       removed function.
        </history>
        <history author="Alan Richmond" email="[e-mail]" type="Update" date="1-Jan-2003">
            Ported to PEAR MDB.
            Methods supported:
                connect, query, getColumnNames, numCols, endOfResult, fetch,
                numRows, freeResult, fetchInto, nextResult, setSelectedRowRange
                (inherited).
        </history>
        <history
            Removed array_change_key_case() work around for <4.2.0 in
            getColumnNames(), found it already done in MDB/Common.php.
        </history>
        <history author="Alan Richmond" email="[e-mail]" type="Update" date="3-Feb-2003">
            Changed default eolDelim to a *nix file eol, since we're trimming
            the result anyway, it makes no difference for Windows.  Now only
            Mac file eols should need to be set (and other kinds of chars).
        </history>
        <note author="Alan Richmond">
            Got WAY too long.  See querysim_readme.txt for instructions and some
            examples.
            io section only documents elements of DB_result that DB_querysim uses,
            adds or changes; see MDB and MDB_Common for more info.
            io section uses some elements that are not Fusedoc 2.0 compliant:
            object and resource.
        </note>
    </properties>
    <io>
        <in>
            <file path="MDB/Common.php" action="require_once" />
        </in>
        <out>
            <object name="MDB_querysim" extends="MDB_Common" instantiatedby="MDB::connect()">
                <resource type="file" name="connection" oncondition="source is external file" scope="class" />
                <string name="phptype" default="querysim" />
                <string name="dbsyntax" default="querysim" />
                <array name="supported" comments="most of these don't actually do anything, they are enabled to simulate the option being available if checked">
                    <boolean name="Sequences" default="true" />
                    <boolean name="Indexes" default="true" />
                    <boolean name="AffectedRows" default="true" />
                    <boolean name="Summaryfunctions" default="true" />
                    <boolean name="OrderByText" default="true" />
                    <boolean name="CurrId" default="true" />
                    <boolean name="SelectRowRanges" default="true" comments="this one is functional" />
                    <boolean name="LOBs" default="true" />
                    <boolean name="Replace" default="true" />
                    <boolean name="SubSelects" default="true" />
                    <boolean name="Transactions" default="true" />
                </array>
                <string name="last_query" comments="last value passed in with query()" />
                <array name="options" comments="these can be changed at run time">
                    <string name="columnDelim" default="," />
                    <string name="dataDelim" default="|" />
                    <string name="eolDelim" default="chr(13).chr(10)" />
                </array>
            </object>
            <array name="result" comments="the simulated record set returned by ::query()">
                <array comments="columns">
                    <string comments="column name" />
                </array>
                <array comments="data">
                    <array comments="row">
                        <string comments="data element" />
                    </array>
                </array>
            </array>
        </out>
    </io>
</fusedoc>
*/

require_once 'MDB/Common.php';

/**
 * MDB QuerySim driver
 *
 * @package MDB
 * @category Database
 * @author  Alan Richmond <[e-mail]>
 */
class MDB_querysim extends MDB_Common
{
// Most of the class variables are taken from the corresponding Metabase driver.
// Few are taken from the corresponding PEAR DB driver.
// Some are MDB specific.
    var $connection = 0;
    var $connected_host;
    var $connected_user;
    var $connected_password;
    var $connected_port;
    var $opened_persistent = '';

    var $escape_quotes = "\\";
    var $decimal_factor = 1.0;

    var $highest_fetched_row = array();
    var $columns = array();
    // }}}

    // {{{ constructor

    /**
    * Constructor
    */
    function MDB_querysim()
    {
        $this->MDB_Common();
        $this->phptype  = 'querysim';
        $this->dbsyntax = 'querysim';
        
        // Most of these are dummies to simulate availability if checked
        $this->supported['Sequences'] = 1;
        $this->supported['Indexes'] = 1;
        $this->supported['AffectedRows'] = 1;
        $this->supported['Summaryfunctions'] = 1;
        $this->supported['OrderByText'] = 1;
        $this->supported['CurrId'] = 1;
        $this->supported['SelectRowRanges'] = 1;// this one is real
        $this->supported['LOBs'] = 1;
        $this->supported['Replace'] = 1;
        $this->supported['SubSelects'] = 1;
        $this->supported['Transactions'] = 1;
        
        // init QuerySim options
        $querySimOptions = array(
            'columnDelim' => ',',
            'dataDelim'   => '|',
            'eolDelim'    => "\n"
        );
        // let runtime options overwrite defaults
        $this->options = array_merge($querySimOptions, $this->options);
    }
    // }}}

    // {{{ connect()

    /**
     * Open a file or simulate a successful database connect
     *
     * @param string $dsn the data source name (see MDB::parseDSN for syntax)
     * @param mixed $persistent (optional) boolean whether the connection should