install/include/classes/sqlutility.php

   1 <?php
   2
   3
   4 class SqlUtility
   5 {
   6         /**
   7         * Function from phpMyAdmin (http://phpwizard.net/projects/phpMyAdmin/)
   8         *
   9         * Removes comment and splits large sql files into individual queries
  10         *
  11         * Last revision: September 23, 2001 - gandon
  12         *
  13         * @param   array    the splitted sql commands
  14         * @param   string   the sql commands
  15         * @return  boolean  always true
  16         * @access  public
  17         */
  18         function splitSqlFile(&$ret, $sql)
  19         {
  20                 $sql               = trim($sql);
  21                 $sql_len           = strlen($sql);
  22                 $char              = '';
  23         $string_start      = '';
  24         $in_string         = false;
  25
  26         for ($i = 0; $i < $sql_len; ++$i) {
  27                 $char = $sql[$i];
  28
  29            // We are in a string, check for not escaped end of
  30                    // strings except for backquotes that can't be escaped
  31            if ($in_string) {
  32                         for (;;) {
  33                         $i         = strpos($sql, $string_start, $i);
  34                                         // No end of string found -> add the current
  35                                         // substring to the returned array
  36                         if (!$i) {
  37                                                 $ret[] = $sql;
  38                         return true;
  39                         }
  40                                         // Backquotes or no backslashes before
  41                                         // quotes: it's indeed the end of the
  42                                         // string -> exit the loop
  43                         else if ($string_start == '`' || $sql[$i-1] != '\\') {
  44                                                 $string_start      = '';
  45                                 $in_string         = false;
  46                         break;
  47                         }
  48                         // one or more Backslashes before the presumed
  49                                         // end of string...
  50                         else {
  51                                                 // first checks for escaped backslashes
  52                         $j                     = 2;
  53                         $escaped_backslash     = false;
  54                                                 while ($i-$j > 0 && $sql[$i-$j] == '\\') {
  55                                                         $escaped_backslash = !$escaped_backslash;
  56                                 $j++;
  57                         }
  58                         // ... if escaped backslashes: it's really the
  59                                                 // end of the string -> exit the loop
  60                         if ($escaped_backslash) {
  61                                                         $string_start  = '';
  62                                 $in_string     = false;
  63                                                         break;
  64                         }
  65                         // ... else loop
  66                         else {
  67                                                         $i++;
  68                         }
  69                         } // end if...elseif...else
  70                 } // end for
  71                 } // end if (in string)
  72                 // We are not in a string, first check for delimiter...
  73                 else if ($char == ';') {
  74                                 // if delimiter found, add the parsed part to the returned array
  75                 $ret[]    = substr($sql, 0, $i);
  76                 $sql      = ltrim(substr($sql, min($i + 1, $sql_len)));
  77                         $sql_len  = strlen($sql);
  78                 if ($sql_len) {
  79                                         $i      = -1;
  80                 } else {
  81                         // The submited statement(s) end(s) here
  82                         return true;
  83                                 }
  84                 } // end else if (is delimiter)
  85                 // ... then check for start of a string,...
  86                 else if (($char == '"') || ($char == '\'') || ($char == '`')) {
  87                                 $in_string    = true;
  88                                 $string_start = $char;
  89                 } // end else if (is start of string)
  90
  91                 // for start of a comment (and remove this comment if found)...
  92                 else if ($char == '#' || ($char == ' ' && $i > 1 && $sql[$i-2] . $sql[$i-1] == '--')) {
  93                 // starting position of the comment depends on the comment type
  94                         $start_of_comment = (($sql[$i] == '#') ? $i : $i-2);
  95                 // if no "\n" exits in the remaining string, checks for "\r"
  96                 // (Mac eol style)
  97                         $end_of_comment   = (strpos(' ' . $sql, "\012", $i+2))
  98                               ? strpos(' ' . $sql, "\012", $i+2)
  99                               : strpos(' ' . $sql, "\015", $i+2);
 100                         if (!$end_of_comment) {
 101                 // no eol found after '#', add the parsed part to the returned
 102                 // array and exit
 103                         $ret[]   = trim(substr($sql, 0, $i-1));
 104                         return true;
 105                                 } else {
 106                         $sql     = substr($sql, 0, $start_of_comment) . ltrim(substr($sql, $end_of_comment));
 107                         $sql_len = strlen($sql);
 108                         $i--;
 109                 } // end if...else
 110                 } // end else if (is comment)
 111         } // end for
 112
 113         // add any rest to the returned array
 114         if (!empty($sql) && trim($sql) != '') {
 115                         $ret[] = $sql;
 116         }
 117         return true;
 118         }
 119
 120         /**
 121          * add a prefix.'_' to all tablenames in a query
 122      *
 123      * @param   string  $query  valid MySQL query string
 124      * @param   string  $prefix prefix to add to all table names
 125          * @return  mixed   FALSE on failure
 126          */
 127         function prefixQuery($query, $prefix)
 128         {
 129                 $pattern = "/^(INSERT INTO|REPLACE INTO|CREATE TABLE|ALTER TABLE|UPDATE)(\s)+([`]?)([^`\s]+)\\3(\s)+/siU";
 130                 $pattern2 = "/^(DROP TABLE)(\s)+([`]?)([^`\s]+)\\3(\s)?$/siU";
 131                 if (preg_match($pattern, $query, $matches) || preg_match($pattern2, $query, $matches)) {
 132                         $replace = "\\1 ".$prefix."\\4\\5";
 133                         $matches[0] = preg_replace($pattern, $replace, $query);
 134
 135                         if ($matches[1] == 'INSERT INTO') {
 136                                 $parts = explode(' ', $matches[0]);
 137                                 $size_of_parts = count($parts);
 138                                 if ($parts[$size_of_parts-2] == 'FROM') {
 139                                         $parts[$size_of_parts-1] = $prefix . str_replace('`', '', $parts[$size_of_parts-1]);
 140                                         $matches[0] = implode(' ', $parts);
 141                                 }
 142                         } else if ($matches[1] == 'ALTER TABLE') {
 143                                 $parts = explode(' ', $matches[0]);
 144                                 if ($parts[3] == 'RENAME') {
 145                                         $parts[4] = $prefix . str_replace('`', '', $parts[4]);
 146                                         $matches[0] = implode(' ', $parts);
 147                                 }
 148                         }
 149
 150                         return $matches;
 151                 }
 152                 return false;
 153         }
 154 }
 155 ?>