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adodb-access.inc.php	2.17 KB	-rwxrwxrwx
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Code Editor : adodb-mssql_n.inc.php

<?php

/// $Id $

///////////////////////////////////////////////////////////////////////////
//                                                                       //
// NOTICE OF COPYRIGHT                                                   //
//                                                                       //
// ADOdb  - Database Abstraction Library for PHP                         //
//                                                                       //
// Latest version is available at http://adodb.org                       //
//                                                                       //
// Copyright (c) 2000-2014 John Lim (jlim\@natsoft.com.my)               //
//          All rights reserved.                                         //
//          Released under both BSD license and LGPL library license.    //
//          Whenever there is any discrepancy between the two licenses,  //
//          the BSD license will take precedence                         //
//                                                                       //
// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
//          http://moodle.com                                            //
//                                                                       //
// Copyright (C) 2001-3001 Martin Dougiamas        http://dougiamas.com  //
//           (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com  //
//                                                                       //
// This program is free software; you can redistribute it and/or modify  //
// it under the terms of the GNU General Public License as published by  //
// the Free Software Foundation; either version 2 of the License, or     //
// (at your option) any later version.                                   //
//                                                                       //
// This program is distributed in the hope that it will be useful,       //
// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
// GNU General Public License for more details:                          //
//                                                                       //
//          http://www.gnu.org/copyleft/gpl.html                         //
//                                                                       //
///////////////////////////////////////////////////////////////////////////

/**
*  MSSQL Driver with auto-prepended "N" for correct unicode storage
*  of SQL literal strings. Intended to be used with MSSQL drivers that
*  are sending UCS-2 data to MSSQL (FreeTDS and ODBTP) in order to get
*  true cross-db compatibility from the application point of view.
*/

// security - hide paths
if (!defined('ADODB_DIR')) die();

// one useful constant
if (!defined('SINGLEQUOTE')) define('SINGLEQUOTE', "'");

include_once(ADODB_DIR.'/drivers/adodb-mssql.inc.php');

class ADODB_mssql_n extends ADODB_mssql {
	var $databaseType = "mssql_n";

function _query($sql,$inputarr=false)
	{
        $sql = $this->_appendN($sql);
		return ADODB_mssql::_query($sql,$inputarr);
	}

/**
     * This function will intercept all the literals used in the SQL, prepending the "N" char to them
     * in order to allow mssql to store properly data sent in the correct UCS-2 encoding (by freeTDS
     * and ODBTP) keeping SQL compatibility at ADOdb level (instead of hacking every project to add
     * the "N" notation when working against MSSQL.
     *
     * The orginal note indicated that this hack should only be used if ALL the char-based columns 
     * in your DB are of type nchar, nvarchar and ntext, but testing seems to indicate that SQL server
     * doesn't seem to care if the statement is used against char etc fields.
     *
     * @todo This function should raise an ADOdb error if one of the transformations fail
     * 
     * @param mixed $inboundData Either a string containing an SQL statement
     *                           or an array with resources from prepared statements
     *
     * @return mixed
     */
    function _appendN($inboundData) {

$inboundIsArray  = false;
       
        if (is_array($inboundData))
        {
            $inboundIsArray = true;
            $inboundArray   = $inboundData;
        } else
            $inboundArray = (array)$inboundData;
        
        /*
         * All changes will be placed here
         */
        $outboundArray = $inboundArray;
        
        foreach($inboundArray as $inboundKey=>$inboundValue)
        {
        
            if (is_resource($inboundValue))
            {
                /*
                * Prepared statement resource
                */
                if ($this->debug)
                    ADOConnection::outp("{$this->databaseType} index $inboundKey value is resource, continue");

continue;
            }
           
            if (strpos($inboundValue, SINGLEQUOTE) === false)
            {
                /*
                * Check we have something to manipulate
                */
                if ($this->debug)
                    ADOConnection::outp("{$this->databaseType} index $inboundKey value $inboundValue has no single quotes, continue");
                continue;
            }

/*
            * Check we haven't an odd number of single quotes (this can cause problems below
            * and should be considered one wrong SQL). Exit with debug info.
            */
            if ((substr_count($inboundValue, SINGLEQUOTE) & 1)) 
            {
                if ($this->debug)
                    ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Wrong number of quotes (odd)");
               
                break;
            }

/*
            * Check we haven't any backslash + single quote combination. It should mean wrong
            *  backslashes use (bad magic_quotes_sybase?). Exit with debug info.
            */
            $regexp = '/(\\\\' . SINGLEQUOTE . '[^' . SINGLEQUOTE . '])/';
            if (preg_match($regexp, $inboundValue))
            {
                if ($this->debug) 
                    ADOConnection::outp("{$this->databaseType} internal transformation: not converted. Found bad use of backslash + single quote");
                
                break;
            }

/*
            * Remove pairs of single-quotes
            */
            $pairs = array();
            $regexp = '/(' . SINGLEQUOTE . SINGLEQUOTE . ')/';
            preg_match_all($regexp, $inboundValue, $list_of_pairs);
            
            if ($list_of_pairs)
            {
                foreach (array_unique($list_of_pairs[0]) as $key=>$value)
                    $pairs['<@#@#@PAIR-'.$key.'@#@#@>'] = $value;
                
                
                if (!empty($pairs))
                    $inboundValue = str_replace($pairs, array_keys($pairs), $inboundValue);
                
            }

/*
            * Remove the rest of literals present in the query
            */
            $literals = array();
            $regexp = '/(N?' . SINGLEQUOTE . '.*?' . SINGLEQUOTE . ')/is';
            preg_match_all($regexp, $inboundValue, $list_of_literals);
           
           if ($list_of_literals)
           {
                foreach (array_unique($list_of_literals[0]) as $key=>$value)
                    $literals['<#@#@#LITERAL-'.$key.'#@#@#>'] = $value;
                
               
                if (!empty($literals))
                    $inboundValue = str_replace($literals, array_keys($literals), $inboundValue);
            }

/*
            * Analyse literals to prepend the N char to them if their contents aren't numeric
            */
            if (!empty($literals))
            {
                foreach ($literals as $key=>$value) {
                    if (!is_numeric(trim($value, SINGLEQUOTE)))
                        /*
                        * Non numeric string, prepend our dear N, whilst 
                        * Trimming potentially existing previous "N"
                        */
                        $literals[$key] = 'N' . trim($value, 'N'); 
                    
                }
            }

/*
            * Re-apply literals to the text
            */
            if (!empty($literals))
                $inboundValue = str_replace(array_keys($literals), $literals, $inboundValue);

/*
            * Any pairs followed by N' must be switched to N' followed by those pairs
            * (or strings beginning with single quotes will fail)
            */
            $inboundValue = preg_replace("/((<@#@#@PAIR-(\d+)@#@#@>)+)N'/", "N'$1", $inboundValue);

/*
            * Re-apply pairs of single-quotes to the text
            */
            if (!empty($pairs))
                $inboundValue = str_replace(array_keys($pairs), $pairs, $inboundValue);

/*
            * Print transformation if debug = on
            */
            if (strcmp($inboundValue,$inboundArray[$inboundKey]) <> 0 && $this->debug)
                ADOConnection::outp("{$this->databaseType} internal transformation: {$inboundArray[$inboundKey]} to {$inboundValue}");
            
            if (strcmp($inboundValue,$inboundArray[$inboundKey]) <> 0)
                /*
                * Place the transformed value into the outbound array
                */
                $outboundArray[$inboundKey] = $inboundValue;
        }
        
        /*
         * Any transformations are in the $outboundArray
         */
        if ($inboundIsArray)
            return $outboundArray;
        
        /*
         * We passed a string in originally
         */
        return $outboundArray[0];
        
    }

}

class ADORecordset_mssql_n extends ADORecordset_mssql {
	var $databaseType = "mssql_n";
	function __construct($id,$mode=false)
	{
		parent::__construct($id,$mode);
	}
}

${this.title}

Code Editor : adodb-mssql_n.inc.php