mssql.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: Sterling Hughes <[e-mail]>                           |
// | Maintainer: Daniel Convissor <[e-mail]>                       |
// +----------------------------------------------------------------------+
//
// $Id: mssql.php,v 1.2 2005/07/22 05:10:13 max Exp $

require_once PEAR_DIR . 'DB/common.php';

/**
 * Database independent query interface definition for PHP's Microsoft SQL Server
 * extension.
 *
 * @package  DB
 * @version  $Id: mssql.php,v 1.2 2005/07/22 05:10:13 max Exp $
 * @category Database
 * @author   Sterling Hughes <[e-mail]>
 */
class DB_mssql extends DB_common
{
    // {{{ properties

    var $connection;
    var $phptype, $dbsyntax;
    var $prepare_tokens = array();
    var $prepare_types = array();
    var $transaction_opcount = 0;
    var $autocommit = true;
    var $_db = null;

    // }}}
    // {{{ constructor

    function DB_mssql()
    {
        $this->DB_common();
        $this->phptype = 'mssql';
        $this->dbsyntax = 'mssql';
        $this->features = array(
            'prepare' => false,
            'pconnect' => true,
            'transactions' => true,
            'limit' => 'emulate'
        );
        // XXX Add here error codes ie: 'S100E' => DB_ERROR_SYNTAX
        $this->errorcode_map = array(
            170   => DB_ERROR_SYNTAX,
            207   => DB_ERROR_NOSUCHFIELD,
            208   => DB_ERROR_NOSUCHTABLE,
            245   => DB_ERROR_INVALID_NUMBER,
            515   => DB_ERROR_CONSTRAINT_NOT_NULL,
            547   => DB_ERROR_CONSTRAINT,
            2627  => DB_ERROR_CONSTRAINT,
            2714  => DB_ERROR_ALREADY_EXISTS,
            3701  => DB_ERROR_NOSUCHTABLE,
            8134  => DB_ERROR_DIVZERO,
        );
    }

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

    function connect($dsninfo, $persistent = false)
    {
        if (!DB::assertExtension('mssql') && !DB::assertExtension('sybase')
            && !DB::assertExtension('sybase_ct'))
        {
            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
        }
        $this->dsn = $dsninfo;
        $dbhost = $dsninfo['hostspec'] ? $dsninfo['hostspec'] : 'localhost';
        $dbhost .= $dsninfo['port'] ? ':' . $dsninfo['port'] : '';

        $connect_function = $persistent ? 'mssql_pconnect' : 'mssql_connect';

        if ($dbhost && $dsninfo['username'] && $dsninfo['password']) {
            $conn = @$connect_function($dbhost, $dsninfo['username'],
                                       $dsninfo['password']);
        } elseif ($dbhost && $dsninfo['username']) {
            $conn = @$connect_function($dbhost, $dsninfo['username']);
        } else {
            $conn = @$connect_function($dbhost);
        }
        if (!$conn) {
            return $this->raiseError(DB_ERROR_CONNECT_FAILED, null, null,
                                         null, @mssql_get_last_message());
        }
        if ($dsninfo['database']) {
            if (!@mssql_select_db($dsninfo['database'], $conn)) {
                return $this->raiseError(DB_ERROR_NODBSELECTED, null, null,
                                         null, @mssql_get_last_message());
            }
            $this->_db = $dsninfo['database'];
        }
        $this->connection = $conn;
        return DB_OK;
    }

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

    function disconnect()
    {
        $ret = @mssql_close($this->connection);
        $this->connection = null;
        return $ret;
    }

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

    function simpleQuery($query)
    {
        $ismanip = DB::isManip($query);
        $this->last_query = $query;
        if (!@mssql_select_db($this->_db, $this->connection)) {
            return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
        }
        $query = $this->modifyQuery($query);
        if (!$this->autocommit && $ismanip) {
            if ($this->transaction_opcount == 0) {
                $result = @mssql_query('BEGIN TRAN', $this->connection);
                if (!$result) {
                    return $this->mssqlRaiseError();
                }
            }
            $this->transaction_opcount++;
        }
        $result = @mssql_query($query, $this->connection);
        if (!$result) {
            return $this->mssqlRaiseError();
        }
        // Determine which queries that should return data, and which
        // should return an error code only.
        return $ismanip ? DB_OK : $result;
    }

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

    /**
     * Move the internal mssql 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($result)
    {
        return @mssql_next_result($result);
    }

    // }}}
    // {{{ 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) {
            if (!@mssql_data_seek($result, $rownum)) {
                return null;
            }
        }
        if ($fetchmode & DB_FETCHMODE_ASSOC) {
            $arr = @mssql_fetch_array($result, MSSQL_ASSOC);
            if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
                $arr = array_change_key_case($arr, CASE_LOWER);
            }
        } else {
            $arr = @mssql_fetch_row($result);
        }
        if (!$arr) {
            /* This throws informative error messages,
               don't use it for now
            if ($msg = @mssql_get_last_message()) {
                return $this->raiseError($msg);
            }
            */
            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()

    function freeResult($result)
    {
        return @mssql_free_result($result);
    }

    // }}}
    // {{{ numCols()

    function numCols($result)
    {
        $cols = @mssql_num_fields($result);
        if (!$cols) {
            return $this->mssqlRaiseError();
        }
        return $cols;
    }

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

    function numRows($result)
    {
        $rows = @mssql_num_rows($result);
        if ($rows === false) {
            return $this->mssqlRaiseError();
        }
        return $rows;
    }

    // }}}
    // {{{ autoCommit()

    /**
     * Enable/disable automatic commits
     */
    function autoCommit($onoff = false)
    {
        // XXX if $this->transaction_opcount > 0, we should probably
        // issue a warning here.
        $this->autocommit = $onoff ? true : false;
        return DB_OK;
    }

    // }}}
    // {{{ commit()

    /**
     * Commit the current transaction.
     */
    function commit()
    {
        if ($this->transaction_opcount > 0) {
            if (!@mssql_select_db($this->_db, $this->connection)) {
                return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
            }
            $result = @mssql_query('COMMIT TRAN', $this->connection);
            $this->transaction_opcount = 0;
            if (!$result) {
                return $this->mssqlRaiseError();
            }
        }
        return DB_OK;
    }

    // }}}
    // {{{ rollback()

    /**
     * Roll back (undo) the current transaction.
     */
    function rollback()
    {
        if ($this->transaction_opcount > 0) {
            if (!@mssql_select_db($this->_db, $this->connection)) {
                return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
            }
            $result = @mssql_query('ROLLBACK TRAN', $this->connection);
            $this->transaction_opcount = 0;
            if (!$result) {
                return $this->mssqlRaiseError();
            }
        }
        return DB_OK;
    }

    // }}}
    // {{{ 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 or DB_ERROR
     */
    function affectedRows()
    {
        if (DB::isManip($this->last_query)) {
            $res = @mssql_query('select @@rowcount', $this->connection);
            if (!$res) {
                return $this->mssqlRaiseError();
            }
            $ar = @mssql_fetch_row($res);
            if (!$ar) {
                $result = 0;
            } else {
                @mssql_free_result($res);
                $result = $ar[0];
            }
        } else {
            $result = 0;
        }
        return $result;
    }

    // }}}
    // {{{ nextId()

    /**
     * Returns the next free id in a sequence
     *
     * @param string  $seq_name  name of the sequence
     * @param boolean $ondemand  when true, the seqence is automatically
     *                           created if it does not exist
     *
     * @return int  the next id number in the sequence.  DB_Error if problem.
     *
     * @internal
     * @see DB_common::nextID()
     * @access public
     */
    function nextId($seq_name, $ondemand = true)
    {
        $seqname = $this->getSequenceName($seq_name);
        if (!@mssql_select_db($this->_db, $this->connection)) {
            return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
        }
        $repeat = 0;
        do {
            $this->pushErrorHandling(PEAR_ERROR_RETURN);
            $result = $this->query("INSERT INTO $seqname (vapor) VALUES (0)");
            $this->popErrorHandling();
            if ($ondemand && DB::isError($result) &&
                ($result->getCode() == DB_ERROR || $result->getCode() == DB_ERROR_NOSUCHTABLE))
            {
                $repeat = 1;