remove files related to database engines other than MySQL

git-svn-id: http://piwigo.org/svn/trunk@13465 68402e56-0260-453c-a942-63ccdbb3a9ee

3 files changed, 0 insertions, 2233 deletions

diff --git a/include/dblayer/functions_pdo-sqlite.inc.php b/include/dblayer/functions_pdo-sqlite.inc.php
deleted file mode 100644
index c14137c7f..000000000
--- a/include/dblayer/functions_pdo-sqlite.inc.php
+++ /dev/null
@@ -1,713 +0,0 @@
-<?php
-// +-----------------------------------------------------------------------+
-// | Piwigo - a PHP based photo gallery                                    |
-// +-----------------------------------------------------------------------+
-// | Copyright(C) 2008-2012 Piwigo Team                  http://piwigo.org |
-// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
-// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
-// +-----------------------------------------------------------------------+
-// | 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                                          |
-// |                                                                       |
-// | 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.                              |
-// |                                                                       |
-// | You should have received a copy of the GNU General Public License     |
-// | along with this program; if not, write to the Free Software           |
-// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
-// | USA.                                                                  |
-// +-----------------------------------------------------------------------+
-
-define('REQUIRED_PDO_SQLITE_VERSION', '3.0.0');
-define('DB_ENGINE', 'SQLite');
-
-define('DB_REGEX_OPERATOR', 'REGEXP');
-define('DB_RANDOM_FUNCTION', 'RANDOM');
-
-/**
- *
- * simple functions
- *
- */
-
-function pwg_db_connect($host, $user, $password, $database)
-{
-  global $conf;
-
-  $db_file = sprintf('sqlite:%s/%s.db', PHPWG_ROOT_PATH.$conf['data_location'], $database);
-
-  $link = new PDO($db_file);
-  if (!$link)
-  {
-    throw new  Exception('Connection to server succeed, but it was impossible to connect to database');
-  }
-
-  $link->sqliteCreateFunction('now', 'pwg_now', 0);
-  $link->sqliteCreateFunction('unix_timestamp', 'pwg_unix_timestamp', 0);
-  $link->sqliteCreateFunction('md5', 'md5', 1);
-  $link->sqliteCreateFunction('if', 'pwg_if', 3);
-
-  $link->sqliteCreateFunction('regexp', 'pwg_regexp', 2);
-
-  return $link;
-}
-
-function pwg_db_check_version()
-{
-  $current_version = pwg_get_db_version();
-  if (version_compare($current_version, REQUIRED_PDO_SQLITE_VERSION, '<'))
-  {
-    fatal_error(
-      sprintf(
-        'your database version is too old, you have "%s" and you need at least "%s"',
-        $current_version,
-        REQUIRED_PDO_SQLITE_VERSION
-        )
-      );
-  }
-}
-
-function pwg_db_check_charset() 
-{
-  return true;
-}
-
-function pwg_get_db_version() 
-{
-  global $pwg_db_link;
-
-  return $pwg_db_link->getAttribute(PDO::ATTR_SERVER_VERSION);
-}
-
-function pwg_query($query)
-{
-  global $conf,$page,$debug,$t2,$pwg_db_link;
-
-  $start = get_moment();
-
-  $truncate_pattern = '`truncate(.*)`i';
-  $insert_pattern = '`(INSERT INTO [^)]*\)\s*VALUES)(\([^)]*\))\s*,\s*(.*)`mi';  
-
-  if (preg_match($truncate_pattern, $query, $matches))
-  {
-    $query = str_replace('TRUNCATE TABLE', 'DELETE FROM', $query);
-    $truncate_query = true;
-    ($result = $pwg_db_link->exec($query)) or die($query."\n<br>".$pwg_db_link->errorInfo());
-  }
-  elseif (preg_match($insert_pattern, $query, $matches))
-  {
-    $base_query = substr($query, 0, strlen($matches[1])+1);
-    $values_pattern = '`\)\s*,\s*\(`';
-    $values = preg_split($values_pattern, substr($query, strlen($matches[1])+1));
-    $values[0] = substr($values[0], 1);
-    $values[count($values)-1] = substr($values[count($values)-1], 
-				     0, 
-				     strlen($values[count($values)-1])-1
-				     );
-    for ($n=0;$n<count($values);$n++)
-    {
-      $query = $base_query . '('. $values[$n] . ")\n;";
-      ($result = $pwg_db_link->query($query)) 
-	or die($query."\n<br>".$pwg_db_link->lastErrorMsg());
-    }
-  }
-  else 
-  {
-    ($result = $pwg_db_link->query($query)) 
-      or die($query."\n<br>".$pwg_db_link->errorInfo());
-  }
-
-  $time = get_moment() - $start;
-
-  if (!isset($page['count_queries']))
-  {
-    $page['count_queries'] = 0;
-    $page['queries_time'] = 0;
-  }
-
-  $page['count_queries']++;
-  $page['queries_time']+= $time;
-
-  if ($conf['show_queries'])
-  {
-    $output = '';
-    $output.= '<pre>['.$page['count_queries'].'] ';
-    $output.= "\n".$query;
-    $output.= "\n".'(this query time : ';
-    $output.= '<b>'.number_format($time, 3, '.', ' ').' s)</b>';
-    $output.= "\n".'(total SQL time  : ';
-    $output.= number_format($page['queries_time'], 3, '.', ' ').' s)';
-    $output.= "\n".'(total time      : ';
-    $output.= number_format( ($time+$start-$t2), 3, '.', ' ').' s)';
-    if ( $result!=null and preg_match('/\s*SELECT\s+/i',$query) )
-    {
-      $output.= "\n".'(num rows        : ';
-      $output.= pwg_db_num_rows($result).' )';
-    }
-    elseif ( $result!=null
-      and preg_match('/\s*INSERT|UPDATE|REPLACE|DELETE\s+/i',$query) 
-      and !isset($truncate_query))
-    {
-      $output.= "\n".'(affected rows   : ';
-      $output.= pwg_db_changes($result).' )';
-    }
-    $output.= "</pre>\n";
-
-    $debug .= $output;
-  }
-
-  return $result;
-}
-
-function pwg_db_nextval($column, $table)
-{
-  $query = '
-SELECT MAX('.$column.')+1
-  FROM '.$table;
-  list($next) = pwg_db_fetch_row(pwg_query($query));
-  if (is_null($next))
-  {
-    $next = 1;
-  }
-  return $next;
-}
-
-/**
- *
- * complex functions
- *
- */
-
-function pwg_db_changes(PDOStatement $result=null) 
-{
-  return $result->rowCount();
-}
-
-function pwg_db_num_rows(PDOStatement $result) 
-{ 
-  return $result->rowCount();
-}
-
-function pwg_db_fetch_assoc($result)
-{
-  return $result->fetch(PDO::FETCH_ASSOC);
-}
-
-function pwg_db_fetch_row($result)
-{
-  return $result->fetch(PDO::FETCH_NUM);
-}
-
-function pwg_db_fetch_object($result)
-{
-  return $result;
-}
-
-function pwg_db_free_result($result) 
-{
-}
-
-function pwg_db_real_escape_string($s)
-{
-  global $pwg_db_link;
-
-  return trim($pwg_db_link->quote($s), "'");
-}
-
-function pwg_db_insert_id($table=null, $column='id')
-{
-  global $pwg_db_link;
-
-  return $pwg_db_link->lastInsertRowID();
-}
-
-/**
- *
- * complex functions
- *
- */
-
-/**
- * creates an array based on a query, this function is a very common pattern
- * used here
- *
- * @param string $query
- * @param string $fieldname
- * @return array
- */
-function array_from_query($query, $fieldname)
-{
-  $array = array();
-
-  $result = pwg_query($query);
-  while ($row = pwg_db_fetch_assoc($result))
-  {
-    array_push($array, $row[$fieldname]);
-  }
-
-  return $array;
-}
-
-define('MASS_UPDATES_SKIP_EMPTY', 1);
-/**
- * updates multiple lines in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array datas
- * @param int flags - if MASS_UPDATES_SKIP_EMPTY - empty values do not overwrite existing ones
- * @return void
- */
-function mass_updates($tablename, $dbfields, $datas, $flags=0)
-{
-  if (count($datas) == 0)
-    return;
-
-  foreach ($datas as $data)
-  {
-    $query = '
-UPDATE '.$tablename.'
-  SET ';
-    $is_first = true;
-    foreach ($dbfields['update'] as $key)
-    {
-      $separator = $is_first ? '' : ",\n    ";
-      
-      if (isset($data[$key]) and $data[$key] != '')
-      {
-        $query.= $separator.$key.' = \''.$data[$key].'\'';
-      }
-      else
-      {
-        if ( $flags & MASS_UPDATES_SKIP_EMPTY )
-          continue; // next field
-        $query.= "$separator$key = NULL";
-      }
-      $is_first = false;
-    }
-    if (!$is_first)
-    {// only if one field at least updated
-      $query.= '
-  WHERE ';
-      $is_first = true;
-      foreach ($dbfields['primary'] as $key)
-      {
-        if (!$is_first)
-        {
-          $query.= ' AND ';
-        }
-        if ( isset($data[$key]) )
-        {
-          $query.= $key.' = \''.$data[$key].'\'';
-        }
-        else
-        {
-          $query.= $key.' IS NULL';
-        }
-        $is_first = false;
-      }
-      pwg_query($query);
-    }
-  }
-}
-
-/**
- * updates one line in a table
- *
- * @param string table_name
- * @param array set_fields
- * @param array where_fields
- * @param int flags - if MASS_UPDATES_SKIP_EMPTY - empty values do not overwrite existing ones
- * @return void
- */
-function single_update($tablename, $set_fields, $where_fields, $flags=0)
-{
-  if (count($set_fields) == 0)
-  {
-    return;
-  }
-
-  $query = '
-UPDATE '.$tablename.'
-  SET ';
-  $is_first = true;
-  foreach ($set_fields as $key => $value)
-  {
-    $separator = $is_first ? '' : ",\n    ";
-
-    if (isset($value) and $value != '')
-    {
-      $query.= $separator.$key.' = \''.$value.'\'';
-    }
-    else
-    {
-      if ( $flags & MASS_UPDATES_SKIP_EMPTY )
-        continue; // next field
-      $query.= "$separator$key = NULL";
-    }
-    $is_first = false;
-  }
-  if (!$is_first)
-  {// only if one field at least updated
-    $query.= '
-  WHERE ';
-    $is_first = true;
-    foreach ($where_fields as $key => $value)
-    {
-      if (!$is_first)
-      {
-        $query.= ' AND ';
-      }
-      if ( isset($value) )
-      {
-        $query.= $key.' = \''.$value.'\'';
-      }
-      else
-      {
-        $query.= $key.' IS NULL';
-      }
-      $is_first = false;
-    }
-    pwg_query($query);
-  }
-}
-
-/**
- * inserts multiple lines in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array inserts
- * @return void
- */
-function mass_inserts($table_name, $dbfields, $datas)
-{
-  if (count($datas) != 0)
-  {
-    $first = true;
-
-    $packet_size = 16777216;
-    $packet_size = $packet_size - 2000; // The last list of values MUST not exceed 2000 character*/
-    $query = '';
-
-    foreach ($datas as $insert)
-    {
-      if (strlen($query) >= $packet_size)
-      {
-        pwg_query($query);
-        $first = true;
-      }
-
-      if ($first)
-      {
-        $query = '
-INSERT INTO '.$table_name.'
-  ('.implode(',', $dbfields).')
-  VALUES';
-        $first = false;
-      }
-      else
-      {
-        $query .= '
-  , ';
-      }
-
-      $query .= '(';
-      foreach ($dbfields as $field_id => $dbfield)
-      {
-        if ($field_id > 0)
-        {
-          $query .= ',';
-        }
-
-        if (!isset($insert[$dbfield]) or $insert[$dbfield] === '')
-        {
-          $query .= 'NULL';
-        }
-        else
-        {
-          $query .= "'".$insert[$dbfield]."'";
-        }
-      }
-      $query .= ')';
-    }
-    pwg_query($query);
-  }
-}
-
-/**
- * inserts one line in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array insert
- * @return void
- */
-function single_insert($table_name, $data)
-{
-  if (count($data) != 0)
-  {
-    $query = '
-INSERT INTO '.$table_name.'
-  ('.implode(',', array_keys($data)).')
-  VALUES';
-
-    $query .= '(';
-    $is_first = true;
-    foreach ($data as $key => $value)
-    {
-      if (!$is_first)
-      {
-        $query .= ',';
-      }
-      else
-      {
-        $is_first = false;
-      }
-      
-      if ($value === '')
-      {
-        $query .= 'NULL';
-      }
-      else
-      {
-        $query .= "'".$value."'";
-      }
-    }
-    $query .= ')';
-    
-    pwg_query($query);
-  }
-}
-
-/**
- * Do maintenance on all PWG tables
- *
- * @return none
- */
-function do_maintenance_all_tables()
-{
-  global $prefixeTable, $page;
-
-  $all_tables = array();
-
-  // List all tables
-  $query = 'SELECT name FROM SQLITE_MASTER
-WHERE name LIKE \''.$prefixeTable.'%\'';
-
-  $all_tables = array_from_query($query, 'name');
-  foreach ($all_tables as $table_name)
-  {
-    $query = 'VACUUM '.$table_name.';';
-    $result = pwg_query($query);
-  }
-  
-  array_push($page['infos'],
-	     l10n('All optimizations have been successfully completed.')
-	     );
-}
-
-function pwg_db_concat($array)
-{
-  return implode($array, ' || ');
-}
-
-function pwg_db_concat_ws($array, $separator)
-{
-  return implode($array, ' || \''.$separator.'\' || ');
-}
-
-function pwg_db_cast_to_text($string)
-{
-  return $string;
-}
-
-/**
- * returns an array containing the possible values of an enum field
- *
- * @param string tablename
- * @param string fieldname
- */
-function get_enums($table, $field)
-{
-  $Enums['categories']['status'] = array('public', 'private');
-  $Enums['history']['section'] = array('categories','tags','search','list','favorites','most_visited','best_rated','recent_pics','recent_cats');
-  $Enums['user_infos']['status'] = array('webmaster','admin','normal','generic','guest');
-  $Enums['image']['type'] = array('picture','high','other');
-  $Enums['plugins']['state'] = array('active', 'inactive');
-  $Enums['user_cache_image']['access_type'] = array('NOT IN','IN');
-
-  $table = str_replace($GLOBALS['prefixeTable'], '', $table);
-  if (isset($Enums[$table][$field])) {
-    return $Enums[$table][$field];
-  } else {
-    return array();
-  }
-}
-
-// get_boolean transforms a string to a boolean value. If the string is
-// "false" (case insensitive), then the boolean value false is returned. In
-// any other case, true is returned.
-function get_boolean( $string )
-{
-  $boolean = true;
-  if ('f' === $string || 'false' === $string)
-  {
-    $boolean = false;
-  }
-  return $boolean;
-}
-
-/**
- * returns boolean string 'true' or 'false' if the given var is boolean
- *
- * @param mixed $var
- * @return mixed
- */
-function boolean_to_string($var)
-{
-  if (is_bool($var))
-  {
-    return $var ? 'true' : 'false';
-  }
-  else
-  {
-    return $var;
-  }
-}
-
-/**
- *
- * interval and date functions 
- *
- */
-
-function pwg_db_get_recent_period_expression($period, $date='CURRENT_DATE')
-{
-  if ($date!='CURRENT_DATE')
-  {
-    $date = '\''.$date.'\'';
-  }
-
-  return 'date('.$date.',\''.-$period.' DAY\')';
-}
-
-function pwg_db_get_recent_period($period, $date='CURRENT_DATE')
-{
-  $query = 'select '.pwg_db_get_recent_period_expression($period, $date);
-  list($d) = pwg_db_fetch_row(pwg_query($query));
-
-  return $d;
-}
-
-function pwg_db_get_flood_period_expression($seconds)
-{
-  return 'datetime(\'now\', \'localtime\', \''.-$seconds.' seconds\')';
-}
-
-function pwg_db_get_hour($date)
-{
-  return 'strftime(\'%H\', '.$date.')';
-}
-
-
-function pwg_db_get_date_YYYYMM($date)
-{
-  return 'strftime(\'%Y%m\','.$date.')';
-}
-
-function pwg_db_get_date_MMDD($date)
-{
-  return 'strftime(\'%m%d\','.$date.')';
-}
-
-function pwg_db_get_year($date)
-{
-  return 'strftime(\'%Y\','.$date.')';
-}
-
-function pwg_db_get_month($date)
-{
-  return 'strftime(\'%m\','.$date.')';
-}
-
-function pwg_db_get_week($date, $mode=null)
-{
-  return 'strftime(\'%W\','.$date.')';
-}
-
-function pwg_db_get_dayofmonth($date)
-{
-  return 'strftime(\'%d\','.$date.')';
-}
-
-function pwg_db_get_dayofweek($date)
-{
-  return 'strftime(\'%w\','.$date.')';
-}
-
-function pwg_db_get_weekday($date)
-{
-  return 'strftime(\'%w\',date('.$date.',\'-1 DAY\'))';
-}
-
-function pwg_db_date_to_ts($date) 
-{
-  return 'UNIX_TIMESTAMP('.$date.')';
-}
-
-// my_error returns (or send to standard output) the message concerning the
-// error occured for the last mysql query.
-function my_error($header, $die)
-{
-  global $pwg_db_link;
-
-  $error = '';
-  if (isset($pwg_db_link)) 
-  {
-    $error .= '[sqlite error]'.$pwg_db_link->errorInfo()."\n";
-  }
-
-  $error .= $header;
-
-  if ($die)
-  {
-    fatal_error($error);
-  }
-  echo("<pre>");
-  trigger_error($error, E_USER_WARNING);
-  echo("</pre>");
-}
-
-// sqlite create functions
-function pwg_now()
-{
-  return date('Y-m-d H:i:s');
-}
-
-function pwg_unix_timestamp()
-{
-  return time();
-}
-
-function pwg_if($expression, $value1, $value2) 
-{
-  if ($expression)
-  {
-    return $value1;
-  }
-  else
-  {
-    return $value2;
-  }
-} 
-
-function pwg_regexp($pattern, $string)
-{
-  $pattern = sprintf('`%s`', $pattern);
-  return preg_match($pattern, $string);
-}
-?>
diff --git a/include/dblayer/functions_pgsql.inc.php b/include/dblayer/functions_pgsql.inc.php
deleted file mode 100644
index ac560d6b2..000000000
--- a/include/dblayer/functions_pgsql.inc.php
+++ /dev/null
@@ -1,796 +0,0 @@
-<?php
-// +-----------------------------------------------------------------------+
-// | Piwigo - a PHP based photo gallery                                    |
-// +-----------------------------------------------------------------------+
-// | Copyright(C) 2008-2012 Piwigo Team                  http://piwigo.org |
-// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
-// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
-// +-----------------------------------------------------------------------+
-// | 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                                          |
-// |                                                                       |
-// | 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.                              |
-// |                                                                       |
-// | You should have received a copy of the GNU General Public License     |
-// | along with this program; if not, write to the Free Software           |
-// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
-// | USA.                                                                  |
-// +-----------------------------------------------------------------------+
-
-define('REQUIRED_PGSQL_VERSION', '8.0');
-define('DB_ENGINE', 'PostgreSQL');
-
-define('DB_REGEX_OPERATOR', '~');
-define('DB_RANDOM_FUNCTION', 'RANDOM');
-
-/**
- *
- * simple functions
- *
- */
-
-function pwg_db_connect($host, $user, $password, $database)
-{
-  $connection_string = '';
-  if (strpos($host,':') !== false) 
-  {
-    list($host, $port) = explode(':', $host);
-  }
-  $connection_string = sprintf('host=%s', $host);
-  if (!empty($port))
-  {
-    $connection_string .= sprintf(' port=%d', $port);
-  }
-  $connection_string .= sprintf(' user=%s password=%s dbname=%s', 
-				$user, 
-				$password,
-				$database);
-  $link = @pg_connect($connection_string);
-  if (!$link)
-  {
-    throw new Exception("Can't connect to server");
-  }
-  else
-  {
-    return $link;
-  }
-}
-
-function pwg_db_check_version()
-{
-  $current_version = pwg_get_db_version();
-  if (version_compare($current_version, REQUIRED_PGSQL_VERSION, '<'))
-  {
-    fatal_error(
-      sprintf(
-        'your database version is too old, you have "%s" and you need at least "%s"',
-        $current_version,
-        REQUIRED_PGSQL_VERSION
-        )
-      );
-  }
-}
-
-function pwg_db_check_charset() 
-{
-  return true;
-}
-
-function pwg_get_db_version() 
-{
-  list($pg_version) = pwg_db_fetch_row(pwg_query('SHOW SERVER_VERSION;'));
-  
-  return $pg_version;
-}
-
-function pwg_query($query)
-{
-  global $conf,$page,$debug,$t2;
-
-  $replace_pattern = '`REPLACE INTO\s(\S*)\s*([^)]*\))\s*VALUES\(([^,]*),(.*)\)\s*`mi';
-  $select_distinct_pattern = '/SELECT\s+DISTINCT\s*(\S[^;]*\S)\s*(FROM[^(;]+WHERE[^;]+)\s+ORDER\s+BY\s+([^;]*\S)\s*;?/i';
-
-  $start = get_moment();
-
-  if (preg_match($replace_pattern, $query, $matches)
-      && $matches[1]==SESSIONS_TABLE)
-  {
-    $select_query = '
-SELECT id FROM '.$matches[1].'
-  WHERE id='.$matches[3];
-    ( $result = pg_query($select_query)) or die($query."\n<br>".pg_last_error());
-    if (pwg_db_num_rows($result)==1)
-    {
-      $query = '
-UPDATE '.$matches[1].'
-  SET expiration=now()
-  WHERE id='.$matches[3];
-    }
-    else
-    {
-      $query = '
-INSERT INTO '.$matches[1].'
-  '.$matches[2].' VALUES('.$matches[3].','.$matches[4].')';
-    }
-    ( $result = pg_query($query)) or die($query."\n<br>".pg_last_error());      
-  }
-  elseif (preg_match($select_distinct_pattern, $query, $matches))
-  {
-    $select_fields_string='';
-    $distinct_fields_string='';
-    $orderby_fields_string='';
-    
-    foreach (preg_split( '/\s*,\s*/', $matches[1]) as $field)
-    {
-      $split_field = preg_split( '/\s*AS\s*/i', $field);
-      if (isset($split_field[1]))
-      {
-         $distinct_fields[ $split_field[1] ] = $field;
-      }
-      else
-      {
-        $distinct_fields[ $field ] = $field;
-      }
-    }
-    
-    foreach (preg_split( '/\s*,\s*/', $matches[3]) as $field)
-    {
-      $kv = preg_split( '/\s+/', $field );
-      $orderby_fields[ $kv[0] ] = $kv[1];
-    }
-    
-    foreach ($distinct_fields as $as_field => $field)
-    {
-      if ($distinct_fields_string)
-      {
-        $distinct_fields_string=$distinct_fields_string.', ';
-      }
-      
-      $distinct_fields_string=$distinct_fields_string.$as_field;
-      
-      if ($select_fields_string)
-      {
-        $select_fields_string=$select_fields_string.', ';
-      }
-      
-      $select_fields_string=$select_fields_string.$field;
-      
-      if ($orderby_fields_string)
-      {
-        $orderby_fields_string=$orderby_fields_string.', ';
-      }
-      
-      $orderby_fields_string=$orderby_fields_string.$as_field.' ';
-      
-      if (isset($orderby_fields[$as_field]))
-      {
-        $orderby_fields_string=$orderby_fields_string.$orderby_fields[$as_field];
-        unset($orderby_fields[$as_field]);
-      }
-      else
-      {
-        $orderby_fields_string=$orderby_fields_string.'ASC';
-      }
-     }
-    
-     foreach ($orderby_fields as $field => $order)
-     {
-       $orderby_fields_string=$orderby_fields_string.', '.$field.' '.$order;
-     }
-     
-     $query = '
-SELECT DISTINCT ON ('.$distinct_fields_string.') '.$select_fields_string.'
-   '.$matches[2].'
-   ORDER BY '.$orderby_fields_string;
-     ($result = pg_query($query)) or die($query."\n<br>".pg_last_error());
-  }
-  else 
-  {
-    ($result = pg_query($query)) or die($query."\n<br>".pg_last_error());
-  }
-
-  $time = get_moment() - $start;
-
-  if (!isset($page['count_queries']))
-  {
-    $page['count_queries'] = 0;
-    $page['queries_time'] = 0;
-  }
-
-  $page['count_queries']++;
-  $page['queries_time']+= $time;
-
-  if ($conf['show_queries'])
-  {
-    $output = '';
-    $output.= '<pre>['.$page['count_queries'].'] ';
-    $output.= "\n".$query;
-    $output.= "\n".'(this query time : ';
-    $output.= '<b>'.number_format($time, 3, '.', ' ').' s)</b>';
-    $output.= "\n".'(total SQL time  : ';
-    $output.= number_format($page['queries_time'], 3, '.', ' ').' s)';
-    $output.= "\n".'(total time      : ';
-    $output.= number_format( ($time+$start-$t2), 3, '.', ' ').' s)';
-    if ( $result!=null and preg_match('/\s*SELECT\s+/i',$query) )
-    {
-      $output.= "\n".'(num rows        : ';
-      $output.= pwg_db_num_rows($result).' )';
-    }
-    elseif ( $result!=null
-      and preg_match('/\s*INSERT|UPDATE|REPLACE|DELETE\s+/i',$query) )
-    {
-      $output.= "\n".'(affected rows   : ';
-      $output.= pwg_db_changes($result).' )';
-    }
-    $output.= "</pre>\n";
-
-    $debug .= $output;
-  }
-
-  return $result;
-}
-
-function pwg_db_nextval($column, $table)
-{
-  $query = '
-SELECT nextval(\''.$table.'_'.$column.'_seq\')';
-  list($next) = pwg_db_fetch_row(pwg_query($query));
-
-  return $next;
-}
-
-/**
- *
- * complex functions
- *
- */
-
-function pwg_db_changes($result) 
-{
-  return pg_affected_rows($result);
-}
-
-function pwg_db_num_rows($result) 
-{
-  return pg_num_rows($result);
-}
-
-function pwg_db_fetch_assoc($result)
-{
-  return pg_fetch_assoc($result);
-}
-
-function pwg_db_fetch_row($result)
-{
-  return pg_fetch_row($result);
-}
-
-function pwg_db_fetch_object($result)
-{
-  return pg_fetch_object($result);
-}
-
-function pwg_db_free_result($result) 
-{
-  return pg_free_result($result);
-}
-
-function pwg_db_real_escape_string($s)
-{
-  return pg_escape_string($s);
-}
-
-function pwg_db_insert_id($table=null, $column='id')
-{
-  $sequence = sprintf('%s_%s_seq', strtolower($table), $column);
-  $query = '
-SELECT CURRVAL(\''.$sequence.'\');';
-
-  list($id) = pwg_db_fetch_row(pwg_query($query));
-
-  return $id;
-}
-
-/**
- *
- * complex functions
- *
- */
-
-/**
- * creates an array based on a query, this function is a very common pattern
- * used here
- *
- * @param string $query
- * @param string $fieldname
- * @return array
- */
-function array_from_query($query, $fieldname)
-{
-  $array = array();
-
-  $result = pwg_query($query);
-  while ($row = pg_fetch_assoc($result))
-  {
-    array_push($array, $row[$fieldname]);
-  }
-
-  return $array;
-}
-
-define('MASS_UPDATES_SKIP_EMPTY', 1);
-/**
- * updates multiple lines in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array datas
- * @param int flags - if MASS_UPDATES_SKIP_EMPTY - empty values do not overwrite existing ones
- * @return void
- */
-function mass_updates($tablename, $dbfields, $datas, $flags=0)
-{
-  if (count($datas) == 0)
-    return;
-
-  if (count($datas) < 10)
-  {
-    foreach ($datas as $data)
-    {
-      $query = '
-UPDATE '.$tablename.'
-  SET ';
-      $is_first = true;
-      foreach ($dbfields['update'] as $key)
-      {
-        $separator = $is_first ? '' : ",\n    ";
-
-        if (isset($data[$key]) and $data[$key] != '')
-        {
-          $query.= $separator.$key.' = \''.$data[$key].'\'';
-        }
-        else
-        {
-          if ( $flags & MASS_UPDATES_SKIP_EMPTY )
-            continue; // next field
-          $query.= "$separator$key = NULL";
-        }
-        $is_first = false;
-      }
-      if (!$is_first)
-      {// only if one field at least updated
-        $query.= '
-  WHERE ';
-        $is_first = true;
-        foreach ($dbfields['primary'] as $key)
-        {
-          if (!$is_first)
-          {
-            $query.= ' AND ';
-          }
-          if ( isset($data[$key]) )
-          {
-            $query.= $key.' = \''.$data[$key].'\'';
-          }
-          else
-          {
-            $query.= $key.' IS NULL';
-          }
-          $is_first = false;
-        }
-        pwg_query($query);
-      }
-    } // foreach update
-  } 
-  else
-  {
-    $all_fields = array_merge($dbfields['primary'], $dbfields['update']);
-    $temporary_tablename = $tablename.'_'.micro_seconds();
-    $query = '
-CREATE TABLE '.$temporary_tablename.' 
-  AS SELECT * FROM '.$tablename.' WHERE 1=2';
-
-    pwg_query($query);
-    mass_inserts($temporary_tablename, $all_fields, $datas);
-    if ( $flags & MASS_UPDATES_SKIP_EMPTY )
-      $func_set = create_function('$s', 'return "$s = NULLIF(t2.$s, '.$tablename.'.$s)";');
-    else
-      $func_set = create_function('$s', 'return "$s = t2.$s";');
-
-    // update of images table by joining with temporary table
-    $query = '
-UPDATE '.$tablename.'
-  SET '.
-      implode(
-        "\n    , ",
-        array_map($func_set, $dbfields['update'])
-        ).'
-FROM '.$temporary_tablename.' AS t2
-  WHERE '.
-      implode(
-        "\n    AND ",
-        array_map(
-          create_function('$s', 'return "'.$tablename.'.$s = t2.$s";'),
-          $dbfields['primary']
-          )
-        );
-    pwg_query($query);
-    $query = '
-DROP TABLE '.$temporary_tablename;
-    pwg_query($query);
-  }
-}
-
-/**
- * updates one line in a table
- *
- * @param string table_name
- * @param array set_fields
- * @param array where_fields
- * @param int flags - if MASS_UPDATES_SKIP_EMPTY - empty values do not overwrite existing ones
- * @return void
- */
-function single_update($tablename, $set_fields, $where_fields, $flags=0)
-{
-  if (count($set_fields) == 0)
-  {
-    return;
-  }
-
-  $query = '
-UPDATE '.$tablename.'
-  SET ';
-  $is_first = true;
-  foreach ($set_fields as $key => $value)
-  {
-    $separator = $is_first ? '' : ",\n    ";
-
-    if (isset($value) and $value != '')
-    {
-      $query.= $separator.$key.' = \''.$value.'\'';
-    }
-    else
-    {
-      if ( $flags & MASS_UPDATES_SKIP_EMPTY )
-        continue; // next field
-      $query.= "$separator$key = NULL";
-    }
-    $is_first = false;
-  }
-  if (!$is_first)
-  {// only if one field at least updated
-    $query.= '
-  WHERE ';
-    $is_first = true;
-    foreach ($where_fields as $key => $value)
-    {
-      if (!$is_first)
-      {
-        $query.= ' AND ';
-      }
-      if ( isset($value) )
-      {
-        $query.= $key.' = \''.$value.'\'';
-      }
-      else
-      {
-        $query.= $key.' IS NULL';
-      }
-      $is_first = false;
-    }
-    pwg_query($query);
-  }
-}
-
-/**
- * inserts multiple lines in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array inserts
- * @return void
- */
-function mass_inserts($table_name, $dbfields, $datas)
-{
-  if (count($datas) != 0)
-  {
-    $first = true;
-
-    $packet_size = 16777216;
-    $packet_size = $packet_size - 2000; // The last list of values MUST not exceed 2000 character*/
-    $query = '';
-
-    foreach ($datas as $insert)
-    {
-      if (strlen($query) >= $packet_size)
-      {
-        pwg_query($query);
-        $first = true;
-      }
-
-      if ($first)
-      {
-        $query = '
-INSERT INTO '.$table_name.'
-  ('.implode(',', $dbfields).')
-  VALUES';
-        $first = false;
-      }
-      else
-      {
-        $query .= '
-  , ';
-      }
-
-      $query .= '(';
-      foreach ($dbfields as $field_id => $dbfield)
-      {
-        if ($field_id > 0)
-        {
-          $query .= ',';
-        }
-
-        if (!isset($insert[$dbfield]) or $insert[$dbfield] === '')
-        {
-          $query .= 'NULL';
-        }
-        else
-        {
-          $query .= "'".$insert[$dbfield]."'";
-        }
-      }
-      $query .= ')';
-    }
-    pwg_query($query);
-  }
-}
-
-/**
- * inserts one line in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array insert
- * @return void
- */
-function single_insert($table_name, $data)
-{
-  if (count($data) != 0)
-  {
-    $query = '
-INSERT INTO '.$table_name.'
-  ('.implode(',', array_keys($data)).')
-  VALUES';
-
-    $query .= '(';
-    $is_first = true;
-    foreach ($data as $key => $value)
-    {
-      if (!$is_first)
-      {
-        $query .= ',';
-      }
-      else
-      {
-        $is_first = false;
-      }
-      
-      if ($value === '')
-      {
-        $query .= 'NULL';
-      }
-      else
-      {
-        $query .= "'".$value."'";
-      }
-    }
-    $query .= ')';
-    
-    pwg_query($query);
-  }
-}
-
-/**
- * Do maintenance on all PWG tables
- *
- * @return none
- */
-function do_maintenance_all_tables()
-{
-  global $prefixeTable, $page;
-
-  $all_tables = array();
-
-  // List all tables
-  $query = 'SELECT tablename FROM pg_tables 
-WHERE tablename like \''.$prefixeTable.'%\'';
-
-  $all_tables = array_from_query($query, 'tablename');
-
-  // Optimize all tables
-  foreach ($all_tables as $table)
-  {
-    $query = 'VACUUM FULL '.$table;
-    pwg_query($query);
-  }
-  array_push($page['infos'],
-	     l10n('All optimizations have been successfully completed.')
-	     );
-}
-
-function pwg_db_concat($array)
-{
-  return implode($array, ' || ');
-}
-
-function pwg_db_concat_ws($array, $separator)
-{
-  return implode($array, ' || \''.$separator.'\' || ');
-}
-
-function pwg_db_cast_to_text($string)
-{
-  return 'CAST('.$string.' AS TEXT)';
-}
-
-/**
- * returns an array containing the possible values of an enum field
- *
- * @param string tablename
- * @param string fieldname
- */
-function get_enums($table, $field)
-{
-  $typname = preg_replace('/'.$GLOBALS['prefixeTable'].'/', '', $table); 
-  $typname .= '_' . $field;
-
-  $query = 'SELECT 
-enumlabel FROM pg_enum JOIN pg_type
-  ON pg_enum.enumtypid=pg_type.oid 
-  WHERE typname=\''.$typname.'\'
-';
-  $result = pwg_query($query);
-  while ($row = pwg_db_fetch_assoc($result))
-  {
-    $options[] = $row['enumlabel'];
-  }
-
-  return $options;
-}
-
-// get_boolean transforms a string to a boolean value. If the string is
-// "false" (case insensitive), then the boolean value false is returned. In
-// any other case, true is returned.
-function get_boolean( $string )
-{
-  $boolean = true;
-  if ('f' == $string || 'false' == $string)
-  {
-    $boolean = false;
-  }
-  return $boolean;
-}
-
-/**
- * returns boolean string 'true' or 'false' if the given var is boolean
- *
- * @param mixed $var
- * @return mixed
- */
-function boolean_to_string($var)
-{
-  if (is_bool($var))
-  {
-    return $var ? 'true' : 'false';
-  }
-  elseif ($var=='t' || $var=='f')
-  {
-    return ($var=='t') ? 'true' : 'false';
-  }
-  else
-  {
-    return $var;
-  }
-}
-
-/**
- *
- * interval and date functions 
- *
- */
-
-function pwg_db_get_recent_period_expression($period, $date='CURRENT_DATE')
-{
-  if ($date!='CURRENT_DATE')
-  {
-    $date = '\''.$date.'\'::date';
-  }
-
-  return '('.$date.' - \''.$period.' DAY\'::interval)::date';
-}
-
-function pwg_db_get_recent_period($period, $date='CURRENT_DATE')
-{
-  $query = 'select '.pwg_db_get_recent_period_expression($period, $date);
-  list($d) = pwg_db_fetch_row(pwg_query($query));
-
-  return $d;
-}
-
-function pwg_db_get_flood_period_expression($seconds)
-{
-  return 'now() - \''.$seconds.' SECOND\'::interval';
-}
-
-function pwg_db_get_hour($date)
-{
-  return 'EXTRACT(HOUR FROM '.$date.')';
-}
-
-function pwg_db_get_date_YYYYMM($date)
-{
-  return 'TO_CHAR('.$date.', \'YYYYMM\')';
-}
-
-function pwg_db_get_date_MMDD($date)
-{
-  return 'TO_CHAR('.$date.', \'MMDD\')';
-}
-
-function pwg_db_get_year($date)
-{
-  return 'EXTRACT(YEAR FROM '.$date.')';
-}
-
-function pwg_db_get_month($date)
-{
-  return 'EXTRACT(MONTH FROM '.$date.')';
-}
-
-function pwg_db_get_week($date, $mode=null)
-{
-  return 'EXTRACT(WEEK FROM '.$date.')';
-}
-
-function pwg_db_get_dayofmonth($date)
-{
-  return 'EXTRACT(DAY FROM '.$date.')';
-}
-
-function pwg_db_get_dayofweek($date)
-{
-  return 'EXTRACT(DOW FROM '.$date.')::INTEGER - 1';
-}
-
-function pwg_db_get_weekday($date)
-{
-  return 'EXTRACT(ISODOW FROM '.$date.')::INTEGER - 1';
-}
-
-function pwg_db_date_to_ts($date) 
-{
-  return 'EXTRACT(EPOCH FROM '.$date.')';
-}
-
-// my_error returns (or send to standard output) the message concerning the
-// error occured for the last pgsql query.
-function my_error($header, $die)
-{
-  $error = '[pgsql error]'.pg_last_error()."\n";
-  $error .= $header;
-
-  if ($die)
-  {
-    fatal_error($error);
-  }
-  echo("<pre>");
-  trigger_error($error, E_USER_WARNING);
-  echo("</pre>");
-}
-
-
-?>
\ No newline at end of file
diff --git a/include/dblayer/functions_sqlite.inc.php b/include/dblayer/functions_sqlite.inc.php
deleted file mode 100644
index 360cbee2c..000000000
--- a/include/dblayer/functions_sqlite.inc.php
+++ /dev/null
@@ -1,724 +0,0 @@
-<?php
-// +-----------------------------------------------------------------------+
-// | Piwigo - a PHP based photo gallery                                    |
-// +-----------------------------------------------------------------------+
-// | Copyright(C) 2008-2012 Piwigo Team                  http://piwigo.org |
-// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
-// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
-// +-----------------------------------------------------------------------+
-// | 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                                          |
-// |                                                                       |
-// | 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.                              |
-// |                                                                       |
-// | You should have received a copy of the GNU General Public License     |
-// | along with this program; if not, write to the Free Software           |
-// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
-// | USA.                                                                  |
-// +-----------------------------------------------------------------------+
-
-define('REQUIRED_SQLITE_VERSION', '3.0.0');
-define('DB_ENGINE', 'SQLite');
-
-define('DB_REGEX_OPERATOR', 'REGEXP');
-define('DB_RANDOM_FUNCTION', 'RANDOM');
-
-/**
- *
- * simple functions
- *
- */
-
-function pwg_db_connect($host, $user, $password, $database)
-{
-  global $conf;
-
-  $db_file = sprintf('%s/%s.db', PHPWG_ROOT_PATH.$conf['data_location'], $database);
-
-  if (script_basename()=='install') 
-  {
-    $sqlite_open_mode = SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE;
-  }
-  else 
-  {
-    $sqlite_open_mode = SQLITE3_OPEN_READWRITE;
-  }
-  
-  $link = new SQLite3($db_file, $sqlite_open_mode);
-  if (!$link)
-  {
-    throw new  Exception('Connection to server succeed, but it was impossible to connect to database');
-  }
-
-  $link->createFunction('now', 'pwg_now', 0);
-  $link->createFunction('unix_timestamp', 'pwg_unix_timestamp', 1);
-  $link->createFunction('md5', 'md5', 1);
-  $link->createFunction('if', 'pwg_if', 3);
-
-  $link->createFunction('regexp', 'pwg_regexp', 2);
-
-  return $link;
-}
-
-function pwg_db_check_version()
-{
-  $current_version = pwg_get_db_version();
-  if (version_compare($current_version, REQUIRED_SQLITE_VERSION, '<'))
-  {
-    fatal_error(
-      sprintf(
-        'your database version is too old, you have "%s" and you need at least "%s"',
-        $current_version,
-        REQUIRED_SQLITE_VERSION
-        )
-      );
-  }
-}
-
-function pwg_db_check_charset() 
-{
-  return true;
-}
-
-function pwg_get_db_version() 
-{
-  global $pwg_db_link;
-
-  $versionInfos = $pwg_db_link->version();
-  return $versionInfos['versionString'];
-}
-
-function pwg_query($query)
-{
-  global $conf,$page,$debug,$t2,$pwg_db_link;
-
-  $start = get_moment();
-
-  $truncate_pattern = '`truncate(.*)`i';
-  $insert_pattern = '`(INSERT INTO [^)]*\)\s*VALUES)(\([^)]*\))\s*,\s*(.*)`mi';  
-
-  if (preg_match($truncate_pattern, $query, $matches))
-  {
-    $query = str_replace('TRUNCATE TABLE', 'DELETE FROM', $query);
-    $truncate_query = true;
-    ($result = $pwg_db_link->exec($query)) or die($query."\n<br>".$pwg_db_link->lastErrorMsg());
-  }
-  elseif (preg_match($insert_pattern, $query, $matches))
-  {
-    $base_query = substr($query, 0, strlen($matches[1])+1);
-    $values_pattern = '`\)\s*,\s*\(`';
-    $values = preg_split($values_pattern, substr($query, strlen($matches[1])+1));
-    $values[0] = substr($values[0], 1);
-    $values[count($values)-1] = substr($values[count($values)-1], 
-				     0, 
-				     strlen($values[count($values)-1])-1
-				     );
-    for ($n=0;$n<count($values);$n++)
-    {
-      $query = $base_query . '('. $values[$n] . ")\n;";
-      ($result = $pwg_db_link->query($query)) 
-	or die($query."\n<br>".$pwg_db_link->lastErrorMsg());
-    }
-  }
-  else 
-  {
-    ($result = $pwg_db_link->query($query)) 
-      or die($query."\n<br>".$pwg_db_link->lastErrorMsg());
-  }
-
-  $time = get_moment() - $start;
-
-  if (!isset($page['count_queries']))
-  {
-    $page['count_queries'] = 0;
-    $page['queries_time'] = 0;
-  }
-
-  $page['count_queries']++;
-  $page['queries_time']+= $time;
-
-  if ($conf['show_queries'])
-  {
-    $output = '';
-    $output.= '<pre>['.$page['count_queries'].'] ';
-    $output.= "\n".$query;
-    $output.= "\n".'(this query time : ';
-    $output.= '<b>'.number_format($time, 3, '.', ' ').' s)</b>';
-    $output.= "\n".'(total SQL time  : ';
-    $output.= number_format($page['queries_time'], 3, '.', ' ').' s)';
-    $output.= "\n".'(total time      : ';
-    $output.= number_format( ($time+$start-$t2), 3, '.', ' ').' s)';
-    if ( $result!=null and preg_match('/\s*SELECT\s+/i',$query) )
-    {
-      $output.= "\n".'(num rows        : ';
-      $output.= pwg_db_num_rows($result).' )';
-    }
-    elseif ( $result!=null
-      and preg_match('/\s*INSERT|UPDATE|REPLACE|DELETE\s+/i',$query) 
-      and !isset($truncate_query))
-    {
-      $output.= "\n".'(affected rows   : ';
-      $output.= pwg_db_changes($result).' )';
-    }
-    $output.= "</pre>\n";
-
-    $debug .= $output;
-  }
-
-  return $result;
-}
-
-function pwg_db_nextval($column, $table)
-{
-  $query = '
-SELECT MAX('.$column.')+1
-  FROM '.$table;
-  list($next) = pwg_db_fetch_row(pwg_query($query));
-  if (is_null($next))
-  {
-    $next = 1;
-  }
-  return $next;
-}
-
-/**
- *
- * complex functions
- *
- */
-
-function pwg_db_changes(SQLite3Result $result=null) 
-{
-  global $pwg_db_link;
-
-  return $pwg_db_link->changes();
-}
-
-function pwg_db_num_rows($result) 
-{ 
-  return $result->numColumns();
-}
-
-function pwg_db_fetch_assoc($result)
-{
-  return $result->fetchArray(SQLITE3_ASSOC);
-}
-
-function pwg_db_fetch_row($result)
-{
-  return $result->fetchArray(SQLITE3_NUM);
-}
-
-function pwg_db_fetch_object($result)
-{
-  return $result;
-}
-
-function pwg_db_free_result($result) 
-{
-}
-
-function pwg_db_real_escape_string($s)
-{
-  global $pwg_db_link;
-
-  return $pwg_db_link->escapeString($s);
-}
-
-function pwg_db_insert_id($table=null, $column='id')
-{
-  global $pwg_db_link;
-
-  return $pwg_db_link->lastInsertRowID();
-}
-
-/**
- *
- * complex functions
- *
- */
-
-/**
- * creates an array based on a query, this function is a very common pattern
- * used here
- *
- * @param string $query
- * @param string $fieldname
- * @return array
- */
-function array_from_query($query, $fieldname)
-{
-  $array = array();
-
-  $result = pwg_query($query);
-  while ($row = pwg_db_fetch_assoc($result))
-  {
-    array_push($array, $row[$fieldname]);
-  }
-
-  return $array;
-}
-
-define('MASS_UPDATES_SKIP_EMPTY', 1);
-/**
- * updates multiple lines in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array datas
- * @param int flags - if MASS_UPDATES_SKIP_EMPTY - empty values do not overwrite existing ones
- * @return void
- */
-function mass_updates($tablename, $dbfields, $datas, $flags=0)
-{
-  if (count($datas) == 0)
-    return;
-
-  foreach ($datas as $data)
-  {
-    $query = '
-UPDATE '.$tablename.'
-  SET ';
-    $is_first = true;
-    foreach ($dbfields['update'] as $key)
-    {
-      $separator = $is_first ? '' : ",\n    ";
-      
-      if (isset($data[$key]) and $data[$key] != '')
-      {
-        $query.= $separator.$key.' = \''.$data[$key].'\'';
-      }
-      else
-      {
-        if ( $flags & MASS_UPDATES_SKIP_EMPTY )
-          continue; // next field
-        $query.= "$separator$key = NULL";
-      }
-      $is_first = false;
-    }
-    if (!$is_first)
-    {// only if one field at least updated
-      $query.= '
-  WHERE ';
-      $is_first = true;
-      foreach ($dbfields['primary'] as $key)
-      {
-        if (!$is_first)
-        {
-          $query.= ' AND ';
-        }
-        if ( isset($data[$key]) )
-        {
-          $query.= $key.' = \''.$data[$key].'\'';
-        }
-        else
-        {
-          $query.= $key.' IS NULL';
-        }
-        $is_first = false;
-      }
-      pwg_query($query);
-    }
-  }
-}
-
-/**
- * updates one line in a table
- *
- * @param string table_name
- * @param array set_fields
- * @param array where_fields
- * @param int flags - if MASS_UPDATES_SKIP_EMPTY - empty values do not overwrite existing ones
- * @return void
- */
-function single_update($tablename, $set_fields, $where_fields, $flags=0)
-{
-  if (count($set_fields) == 0)
-  {
-    return;
-  }
-
-  $query = '
-UPDATE '.$tablename.'
-  SET ';
-  $is_first = true;
-  foreach ($set_fields as $key => $value)
-  {
-    $separator = $is_first ? '' : ",\n    ";
-
-    if (isset($value) and $value != '')
-    {
-      $query.= $separator.$key.' = \''.$value.'\'';
-    }
-    else
-    {
-      if ( $flags & MASS_UPDATES_SKIP_EMPTY )
-        continue; // next field
-      $query.= "$separator$key = NULL";
-    }
-    $is_first = false;
-  }
-  if (!$is_first)
-  {// only if one field at least updated
-    $query.= '
-  WHERE ';
-    $is_first = true;
-    foreach ($where_fields as $key => $value)
-    {
-      if (!$is_first)
-      {
-        $query.= ' AND ';
-      }
-      if ( isset($value) )
-      {
-        $query.= $key.' = \''.$value.'\'';
-      }
-      else
-      {
-        $query.= $key.' IS NULL';
-      }
-      $is_first = false;
-    }
-    pwg_query($query);
-  }
-}
-
-/**
- * inserts multiple lines in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array inserts
- * @return void
- */
-function mass_inserts($table_name, $dbfields, $datas)
-{
-  if (count($datas) != 0)
-  {
-    $first = true;
-
-    $packet_size = 16777216;
-    $packet_size = $packet_size - 2000; // The last list of values MUST not exceed 2000 character*/
-    $query = '';
-
-    foreach ($datas as $insert)
-    {
-      if (strlen($query) >= $packet_size)
-      {
-        pwg_query($query);
-        $first = true;
-      }
-
-      if ($first)
-      {
-        $query = '
-INSERT INTO '.$table_name.'
-  ('.implode(',', $dbfields).')
-  VALUES';
-        $first = false;
-      }
-      else
-      {
-        $query .= '
-  , ';
-      }
-
-      $query .= '(';
-      foreach ($dbfields as $field_id => $dbfield)
-      {
-        if ($field_id > 0)
-        {
-          $query .= ',';
-        }
-
-        if (!isset($insert[$dbfield]) or $insert[$dbfield] === '')
-        {
-          $query .= 'NULL';
-        }
-        else
-        {
-          $query .= "'".$insert[$dbfield]."'";
-        }
-      }
-      $query .= ')';
-    }
-    pwg_query($query);
-  }
-}
-
-/**
- * inserts one line in a table
- *
- * @param string table_name
- * @param array dbfields
- * @param array insert
- * @return void
- */
-function single_insert($table_name, $data)
-{
-  if (count($data) != 0)
-  {
-    $query = '
-INSERT INTO '.$table_name.'
-  ('.implode(',', array_keys($data)).')
-  VALUES';
-
-    $query .= '(';
-    $is_first = true;
-    foreach ($data as $key => $value)
-    {
-      if (!$is_first)
-      {
-        $query .= ',';
-      }
-      else
-      {
-        $is_first = false;
-      }
-      
-      if ($value === '')
-      {
-        $query .= 'NULL';
-      }
-      else
-      {
-        $query .= "'".$value."'";
-      }
-    }
-    $query .= ')';
-    
-    pwg_query($query);
-  }
-}
-
-/**
- * Do maintenance on all PWG tables
- *
- * @return none
- */
-function do_maintenance_all_tables()
-{
-  global $prefixeTable, $page;
-
-  $all_tables = array();
-
-  // List all tables
-  $query = 'SELECT name FROM SQLITE_MASTER
-WHERE name LIKE \''.$prefixeTable.'%\'';
-
-  $all_tables = array_from_query($query, 'name');
-  foreach ($all_tables as $table_name)
-  {
-    $query = 'VACUUM '.$table_name.';';
-    $result = pwg_query($query);
-  }
-  
-  array_push($page['infos'],
-	     l10n('All optimizations have been successfully completed.')
-	     );
-}
-
-function pwg_db_concat($array)
-{
-  return implode($array, ' || ');
-}
-
-function pwg_db_concat_ws($array, $separator)
-{
-  return implode($array, ' || \''.$separator.'\' || ');
-}
-
-function pwg_db_cast_to_text($string)
-{
-  return $string;
-}
-
-/**
- * returns an array containing the possible values of an enum field
- *
- * @param string tablename
- * @param string fieldname
- */
-function get_enums($table, $field)
-{
-  $Enums['categories']['status'] = array('public', 'private');
-  $Enums['history']['section'] = array('categories','tags','search','list','favorites','most_visited','best_rated','recent_pics','recent_cats');
-  $Enums['user_infos']['status'] = array('webmaster','admin','normal','generic','guest');
-  $Enums['image']['type'] = array('picture','high','other');
-  $Enums['plugins']['state'] = array('active', 'inactive');
-  $Enums['user_cache_image']['access_type'] = array('NOT IN','IN');
-
-  $table = str_replace($GLOBALS['prefixeTable'], '', $table);
-  if (isset($Enums[$table][$field])) {
-    return $Enums[$table][$field];
-  } else {
-    return array();
-  }
-}
-
-// get_boolean transforms a string to a boolean value. If the string is
-// "false" (case insensitive), then the boolean value false is returned. In
-// any other case, true is returned.
-function get_boolean( $string )
-{
-  $boolean = true;
-  if ('f' === $string || 'false' === $string)
-  {
-    $boolean = false;
-  }
-  return $boolean;
-}
-
-/**
- * returns boolean string 'true' or 'false' if the given var is boolean
- *
- * @param mixed $var
- * @return mixed
- */
-function boolean_to_string($var)
-{
-  if (is_bool($var))
-  {
-    return $var ? 'true' : 'false';
-  }
-  else
-  {
-    return $var;
-  }
-}
-
-/**
- *
- * interval and date functions 
- *
- */
-
-function pwg_db_get_recent_period_expression($period, $date='CURRENT_DATE')
-{
-  if ($date!='CURRENT_DATE')
-  {
-    $date = '\''.$date.'\'';
-  }
-
-  return 'date('.$date.',\''.-$period.' DAY\')';
-}
-
-function pwg_db_get_recent_period($period, $date='CURRENT_DATE')
-{
-  $query = 'select '.pwg_db_get_recent_period_expression($period, $date);
-  list($d) = pwg_db_fetch_row(pwg_query($query));
-
-  return $d;
-}
-
-function pwg_db_get_flood_period_expression($seconds)
-{
-  return 'datetime(\'now\', \'localtime\', \''.-$seconds.' seconds\')';
-}
-
-function pwg_db_get_hour($date)
-{
-  return 'strftime(\'%H\', '.$date.')';
-}
-
-function pwg_db_get_date_YYYYMM($date)
-{
-  return 'strftime(\'%Y%m\','.$date.')';
-}
-
-function pwg_db_get_date_MMDD($date)
-{
-  return 'strftime(\'%m%d\','.$date.')';
-}
-
-function pwg_db_get_year($date)
-{
-  return 'strftime(\'%Y\','.$date.')';
-}
-
-function pwg_db_get_month($date)
-{
-  return 'strftime(\'%m\','.$date.')';
-}
-
-function pwg_db_get_week($date, $mode=null)
-{
-  return 'strftime(\'%W\','.$date.')';
-}
-
-function pwg_db_get_dayofmonth($date)
-{
-  return 'strftime(\'%d\','.$date.')';
-}
-
-function pwg_db_get_dayofweek($date)
-{
-  return 'strftime(\'%w\','.$date.')';
-}
-
-function pwg_db_get_weekday($date)
-{
-  return 'strftime(\'%w\',date('.$date.',\'-1 DAY\'))';
-}
-
-function pwg_db_date_to_ts($date) 
-{
-  return 'UNIX_TIMESTAMP('.$date.')';
-}
-
-// my_error returns (or send to standard output) the message concerning the
-// error occured for the last mysql query.
-function my_error($header, $die)
-{
-  global $pwg_db_link;
-
-  $error = '';
-  if (isset($pwg_db_link)) 
-  {
-    $error .= '[sqlite error]'.$pwg_db_link->lastErrorMsg()."\n";
-  }
-
-  $error .= $header;
-
-  if ($die)
-  {
-    fatal_error($error);
-  }
-  echo("<pre>");
-  trigger_error($error, E_USER_WARNING);
-  echo("</pre>");
-}
-
-// sqlite create functions
-function pwg_now()
-{
-  return date('Y-m-d H:i:s');
-}
-
-function pwg_unix_timestamp()
-{
-  return strtotime($strDate);
-}
-
-function pwg_if($expression, $value1, $value2) 
-{
-  if ($expression)
-  {
-    return $value1;
-  }
-  else
-  {
-    return $value2;
-  }
-} 
-
-function pwg_regexp($pattern, $string)
-{
-  $pattern = sprintf('`%s`', $pattern);
-  return preg_match($pattern, $string);
-}
-?>