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<?php
/**
* 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.
*
* This file is part of ADOdb, a Database Abstraction Layer library for PHP.
*
* @package ADOdb
* @link https://adodb.org Project's web site and documentation
* @link https://github.com/ADOdb/ADOdb Source code and issue tracker
*
* The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
* and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
* any later version. This means you can use it in proprietary products.
* See the LICENSE.md file distributed with this source code for details.
* @license BSD-3-Clause
* @license LGPL-2.1-or-later
*
* @copyright 2000-2013 John Lim
* @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
*/
// 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 original 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";
}
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