ifx.php

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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 foldmethod=marker: */
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Author: Tomas V.V.Cox <[e-mail]>                              |
// | Maintainer: Daniel Convissor <[e-mail]>                       |
// +----------------------------------------------------------------------+
//
// $Id: ifx.php,v 1.2 2005/07/22 05:10:13 max Exp $


// Legend:
// For more info on Informix errors see:
// http://www.informix.com/answers/english/ierrors.htm
//
// TODO:
//  - set needed env Informix vars on connect
//  - implement native prepare/execute


require_once PEAR_DIR . 'DB/common.php';

/**
 * Database independent query interface definition for PHP's Informix
 * extension.
 *
 * @package  DB
 * @version  $Id: ifx.php,v 1.2 2005/07/22 05:10:13 max Exp $
 * @category Database
 * @author   Tomas V.V.Cox <[e-mail]>
 */
class DB_ifx extends DB_common
{
    // {{{ properties

    var $connection;
    var $affected = 0;
    var $dsn = array();
    var $transaction_opcount = 0;
    var $autocommit = true;
    var $fetchmode = DB_FETCHMODE_ORDERED; /* Default fetch mode */

    // }}}
    // {{{ constructor

    function DB_ifx()
    {
        $this->phptype = 'ifx';
        $this->dbsyntax = 'ifx';
        $this->features = array(
            'prepare' => false,
            'pconnect' => true,
            'transactions' => true,
            'limit' => 'emulate'
        );
        $this->errorcode_map = array(
            '-201'    => DB_ERROR_SYNTAX,
            '-206'    => DB_ERROR_NOSUCHTABLE,
            '-217'    => DB_ERROR_NOSUCHFIELD,
            '-239'    => DB_ERROR_CONSTRAINT,
            '-253'    => DB_ERROR_SYNTAX,
            '-292'    => DB_ERROR_CONSTRAINT_NOT_NULL,
            '-310'    => DB_ERROR_ALREADY_EXISTS,
            '-329'    => DB_ERROR_NODBSELECTED,
            '-346'    => DB_ERROR_CONSTRAINT,
            '-386'    => DB_ERROR_CONSTRAINT_NOT_NULL,
            '-391'    => DB_ERROR_CONSTRAINT_NOT_NULL,
            '-554'    => DB_ERROR_SYNTAX,
            '-691'    => DB_ERROR_CONSTRAINT,
            '-703'    => DB_ERROR_CONSTRAINT_NOT_NULL,
            '-1204'   => DB_ERROR_INVALID_DATE,
            '-1205'   => DB_ERROR_INVALID_DATE,
            '-1206'   => DB_ERROR_INVALID_DATE,
            '-1209'   => DB_ERROR_INVALID_DATE,
            '-1210'   => DB_ERROR_INVALID_DATE,
            '-1212'   => DB_ERROR_INVALID_DATE,
            '-1213'   => DB_ERROR_INVALID_NUMBER,
        );
    }

    // }}}
    // {{{ connect()

    /**
     * Connect to a database and log in as the specified user.
     *
     * @param $dsn the data source name (see DB::parseDSN for syntax)
     * @param $persistent (optional) whether the connection should
     *        be persistent
     *
     * @return int DB_OK on success, a DB error code on failure
     */
    function connect($dsninfo, $persistent = false)
    {
        if (!DB::assertExtension('informix') &&
            !DB::assertExtension('Informix'))
        {
            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
        }
        $this->dsn = $dsninfo;
        $dbhost = $dsninfo['hostspec'] ? '@' . $dsninfo['hostspec'] : '';
        $dbname = $dsninfo['database'] ? $dsninfo['database'] . $dbhost : '';
        $user = $dsninfo['username'] ? $dsninfo['username'] : '';
        $pw = $dsninfo['password'] ? $dsninfo['password'] : '';

        $connect_function = $persistent ? 'ifx_pconnect' : 'ifx_connect';

        $this->connection = @$connect_function($dbname, $user, $pw);
        if (!is_resource($this->connection)) {
            return $this->ifxraiseError(DB_ERROR_CONNECT_FAILED);
        }
        return DB_OK;
    }

    // }}}
    // {{{ disconnect()

    /**
     * Log out and disconnect from the database.
     *
     * @return bool true on success, false if not connected.
     */
    function disconnect()
    {
        $ret = @ifx_close($this->connection);
        $this->connection = null;
        return $ret;
    }

    // }}}
    // {{{ simpleQuery()

    /**
     * Send a query to Informix and return the results as a
     * Informix resource identifier.
     *
     * @param $query the SQL query
     *
     * @return int returns a valid Informix result for successful SELECT
     * queries, DB_OK for other successful queries.  A DB error code
     * is returned on failure.
     */
    function simpleQuery($query)
    {
        $ismanip = DB::isManip($query);
        $this->last_query = $query;
        $this->affected   = null;
        if (preg_match('/(SELECT)/i', $query)) {    //TESTME: Use !DB::isManip()?
            // the scroll is needed for fetching absolute row numbers
            // in a select query result
            $result = @ifx_query($query, $this->connection, IFX_SCROLL);
        } else {
            if (!$this->autocommit && $ismanip) {
                if ($this->transaction_opcount == 0) {
                    $result = @ifx_query('BEGIN WORK', $this->connection);
                    if (!$result) {
                        return $this->ifxraiseError();
                    }
                }
                $this->transaction_opcount++;
            }
            $result = @ifx_query($query, $this->connection);
        }
        if (!$result) {
            return $this->ifxraiseError();
        }
        $this->affected = @ifx_affected_rows($result);
        // Determine which queries should return data, and which
        // should return an error code only.
        if (preg_match('/(SELECT)/i', $query)) {
            return $result;
        }
        // XXX Testme: free results inside a transaction
        // may cause to stop it and commit the work?

        // Result has to be freed even with a insert or update
        @ifx_free_result($result);

        return DB_OK;
    }

    // }}}
    // {{{ nextResult()

    /**
     * Move the internal ifx result pointer to the next available result
     *
     * @param a valid fbsql result resource
     *
     * @access public
     *
     * @return true if a result is available otherwise return false
     */
    function nextResult($result)
    {
        return false;
    }

    // }}}
    // {{{ affectedRows()

    /**
     * Gets the number of rows affected by the last query.
     * if the last query was a select, returns 0.
     *
     * @return number of rows affected by the last query
     */
    function affectedRows()
    {
        if (DB::isManip($this->last_query)) {
            return $this->affected;
        } else {
            return 0;
        }

    }

    // }}}
    // {{{ fetchInto()

    /**
     * Fetch a row and insert the data into an existing array.
     *
     * Formating of the array and the data therein are configurable.
     * See DB_result::fetchInto() for more information.
     *
     * @param resource $result    query result identifier
     * @param array    $arr       (reference) array where data from the row
     *                            should be placed
     * @param int      $fetchmode how the resulting array should be indexed
     * @param int      $rownum    the row number to fetch
     *
     * @return mixed DB_OK on success, null when end of result set is
     *               reached or on failure
     *
     * @see DB_result::fetchInto()
     * @access private
     */
    function fetchInto($result, &$arr, $fetchmode, $rownum=null)
    {
        if (($rownum !== null) && ($rownum < 0)) {
            return null;
        }
        if ($rownum === null) {
            /*
             * Even though fetch_row() should return the next row  if
             * $rownum is null, it doesn't in all cases.  Bug 598.
             */
            $rownum = 'NEXT';
        } else {
            // Index starts at row 1, unlike most DBMS's starting at 0.
            $rownum++;
        }
        if (!$arr = @ifx_fetch_row($result, $rownum)) {
            return null;
        }
        if ($fetchmode !== DB_FETCHMODE_ASSOC) {
            $i=0;
            $order = array();
            foreach ($arr as $val) {
                $order[$i++] = $val;
            }
            $arr = $order;
        } elseif ($fetchmode == DB_FETCHMODE_ASSOC &&
                  $this->options['portability'] & DB_PORTABILITY_LOWERCASE)
        {
            $arr = array_change_key_case($arr, CASE_LOWER);
        }
        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;
    }

    // }}}
    // {{{ numRows()