source: temp/test-xoops.ec-cube.net/html/class/database/sqlutility.php @ 405

<?php
// $Id: sqlutility.php,v 1.2 2005/03/18 12:51:55 onokazu Exp $
// sqlutility.php - defines utility class for MySQL database
/**
 * @package     kernel
 * @subpackage  database
 * 
 * @author      Kazumi Ono  <[email protected]>
 * @copyright   copyright (c) 2000-2003 XOOPS.org
 */

/**
 * provide some utility methods for databases
 * 
 * @author Kazumi Ono <[email protected]>
 * @copyright copyright (c) 2000-2003 XOOPS.org
 * 
 * @package kernel
 * @subpackage  database
 */
class SqlUtility
{
    /**
    * Function from phpMyAdmin (http://phpwizard.net/projects/phpMyAdmin/)
    *
    * Removes comment and splits large sql files into individual queries
    *
    * Last revision: September 23, 2001 - gandon
    *
    * @param   array    the splitted sql commands
    * @param   string   the sql commands
    * @return  boolean  always true
    * @access  public
    */
    function splitMySqlFile(&$ret, $sql)
    {
        $sql               = trim($sql);
        $sql_len           = strlen($sql);
        $char              = '';
        $string_start      = '';
        $in_string         = false;

        for ($i = 0; $i < $sql_len; ++$i) {
            $char = $sql[$i];

           // We are in a string, check for not escaped end of
           // strings except for backquotes that can't be escaped
           if ($in_string) {
                for (;;) {
                    $i         = strpos($sql, $string_start, $i);
                    // No end of string found -> add the current
                    // substring to the returned array
                    if (!$i) {
                        $ret[] = $sql;
                        return true;
                    }
                    // Backquotes or no backslashes before 
                    // quotes: it's indeed the end of the 
                    // string -> exit the loop
                    else if ($string_start == '`' || $sql[$i-1] != '\\') {
                        $string_start      = '';
                        $in_string         = false;
                        break;
                    }
                    // one or more Backslashes before the presumed 
                    // end of string...
                    else {
                        // first checks for escaped backslashes
                        $j                     = 2;
                        $escaped_backslash     = false;
                        while ($i-$j > 0 && $sql[$i-$j] == '\\') {
                            $escaped_backslash = !$escaped_backslash;
                            $j++;
                        }
                        // ... if escaped backslashes: it's really the 
                        // end of the string -> exit the loop
                        if ($escaped_backslash) {
                            $string_start  = '';
                            $in_string     = false;
                            break;
                        }
                        // ... else loop
                        else {
                            $i++;
                        }
                    } // end if...elseif...else
                } // end for
            } // end if (in string)
            // We are not in a string, first check for delimiter...
            else if ($char == ';') {
                // if delimiter found, add the parsed part to the returned array
                $ret[]    = substr($sql, 0, $i);
                $sql      = ltrim(substr($sql, min($i + 1, $sql_len)));
                $sql_len  = strlen($sql);
                if ($sql_len) {
                    $i      = -1;
                } else {
                    // The submited statement(s) end(s) here
                    return true;
                }
            } // end else if (is delimiter)
            // ... then check for start of a string,...
            else if (($char == '"') || ($char == '\'') || ($char == '`')) {
                $in_string    = true;
                $string_start = $char;
            } // end else if (is start of string)

            // for start of a comment (and remove this comment if found)...
            else if ($char == '#' || ($char == ' ' && $i > 1 && $sql[$i-2] . $sql[$i-1] == '--')) {
                // starting position of the comment depends on the comment type
                $start_of_comment = (($sql[$i] == '#') ? $i : $i-2);
                // if no "\n" exits in the remaining string, checks for "\r"
                // (Mac eol style)
                $end_of_comment   = (strpos(' ' . $sql, "\012", $i+2))
                              ? strpos(' ' . $sql, "\012", $i+2)
                              : strpos(' ' . $sql, "\015", $i+2);
                if (!$end_of_comment) {
                // no eol found after '#', add the parsed part to the returned
                // array and exit
                    // RMV fix for comments at end of file
                    $last = trim(substr($sql, 0, $i-1));
                    if (!empty($last)) {
                        $ret[] = $last;
                    }
                    return true;
                } else {
                    $sql     = substr($sql, 0, $start_of_comment) . ltrim(substr($sql, $end_of_comment));
                    $sql_len = strlen($sql);
                    $i--;
                } // end if...else
            } // end else if (is comment)
        } // end for

        // add any rest to the returned array
        if (!empty($sql) && trim($sql) != '') {
            $ret[] = $sql;
        }
        return true;
    }

    /**
     * add a prefix.'_' to all tablenames in a query
     * 
     * @param   string  $query  valid SQL query string
     * @param   string  $prefix prefix to add to all table names
     * @return  mixed   FALSE on failure
     */
    function prefixQuery($query, $prefix)
    {
        $pattern = "/^(INSERT INTO|CREATE TABLE|ALTER TABLE|UPDATE)(\s)+([`]?)([^`\s]+)\\3(\s)+/siU";
        $pattern2 = "/^(DROP TABLE)(\s)+([`]?)([^`\s]+)\\3(\s)?$/siU";
        if (preg_match($pattern, $query, $matches) || preg_match($pattern2, $query, $matches)) {
            $replace = "\\1 ".$prefix."_\\4\\5";
            $matches[0] = preg_replace($pattern, $replace, $query);
            return $matches;
        }
        return false;
    }
}
?>