pgsql.class.php

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<?php
/* Copyright (C) 2001   Fabien Seisen     <seisen@linuxfr.org>
 * Copyright (C) 2002-2005  Rodolphe Quiedeville  <rodolphe@quiedeville.org>
 * Copyright (C) 2004-2014  Laurent Destailleur   <eldy@users.sourceforge.net>
 * Copyright (C) 2004   Sebastien Di Cintio   <sdicintio@ressource-toi.org>
 * Copyright (C) 2004   Benoit Mortier      <benoit.mortier@opensides.be>
 * Copyright (C) 2005-2012  Regis Houssin     <regis.houssin@inodbox.com>
 * Copyright (C) 2012   Yann Droneaud     <yann@droneaud.fr>
 * Copyright (C) 2012   Florian Henry     <florian.henry@open-concept.pro>
 * Copyright (C) 2015       Marcos García           <marcosgdf@gmail.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 3 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */
 
require_once DOL_DOCUMENT_ROOT.'/core/db/DoliDB.class.php';
 
class DoliDBPgsql extends DoliDB
{
  public $type = 'pgsql'; // Name of manager
 
  const LABEL = 'PostgreSQL'; // Label of manager
 
  public $forcecharset = 'UTF8'; // Can't be static as it may be forced with a dynamic value
 
  public $forcecollate = ''; // Can't be static as it may be forced with a dynamic value
 
  const VERSIONMIN = '9.0.0'; // Version min database
 
  public $unescapeslashquot = false;
  public $standard_conforming_strings = false;
 
 
  private $_results;
 
 
 
  public function __construct($type, $host, $user, $pass, $name = '', $port = 0)
  {
    global $conf, $langs;
 
    // Note that having "static" property for "$forcecharset" and "$forcecollate" will make error here in strict mode, so they are not static
    if (!empty($conf->db->character_set)) {
      $this->forcecharset = $conf->db->character_set;
    }
    if (!empty($conf->db->dolibarr_main_db_collation)) {
      $this->forcecollate = $conf->db->dolibarr_main_db_collation;
    }
 
    $this->database_user = $user;
    $this->database_host = $host;
    $this->database_port = $port;
 
    $this->transaction_opened = 0;
 
    //print "Name DB: $host,$user,$pass,$name<br>";
 
    if (!function_exists("pg_connect")) {
      $this->connected = false;
      $this->ok = false;
      $this->error = "Pgsql PHP functions are not available in this version of PHP";
      dol_syslog(get_class($this)."::DoliDBPgsql : Pgsql PHP functions are not available in this version of PHP", LOG_ERR);
      return;
    }
 
    if (!$host) {
      $this->connected = false;
      $this->ok = false;
      $this->error = $langs->trans("ErrorWrongHostParameter");
      dol_syslog(get_class($this)."::DoliDBPgsql : Erreur Connect, wrong host parameters", LOG_ERR);
      return;
    }
 
    // Essai connexion serveur
    //print "$host, $user, $pass, $name, $port";
    $this->db = $this->connect($host, $user, $pass, $name, $port);
 
    if ($this->db) {
      $this->connected = true;
      $this->ok = true;
    } else {
      // host, login ou password incorrect
      $this->connected = false;
      $this->ok = false;
      $this->error = 'Host, login or password incorrect';
      dol_syslog(get_class($this)."::DoliDBPgsql : Erreur Connect ".$this->error.'. Failed to connect to host='.$host.' port='.$port.' user='.$user, LOG_ERR);
    }
 
    // Si connexion serveur ok et si connexion base demandee, on essaie connexion base
    if ($this->connected && $name) {
      if ($this->select_db($name)) {
        $this->database_selected = true;
        $this->database_name = $name;
        $this->ok = true;
      } else {
        $this->database_selected = false;
        $this->database_name = '';
        $this->ok = false;
        $this->error = $this->error();
        dol_syslog(get_class($this)."::DoliDBPgsql : Erreur Select_db ".$this->error, LOG_ERR);
      }
    } else {
      // Pas de selection de base demandee, ok ou ko
      $this->database_selected = false;
    }
  }
 
 
  public function convertSQLFromMysql($line, $type = 'auto', $unescapeslashquot = false)
  {
    global $conf;
 
    // Removed empty line if this is a comment line for SVN tagging
    if (preg_match('/^--\s\$Id/i', $line)) {
      return '';
    }
    // Return line if this is a comment
    if (preg_match('/^#/i', $line) || preg_match('/^$/i', $line) || preg_match('/^--/i', $line)) {
      return $line;
    }
    if ($line != "") {
      // group_concat support (PgSQL >= 9.0)
      // Replace group_concat(x) or group_concat(x SEPARATOR ',') with string_agg(x, ',')
      $line = preg_replace('/GROUP_CONCAT/i', 'STRING_AGG', $line);
      $line = preg_replace('/ SEPARATOR/i', ',', $line);
      $line = preg_replace('/STRING_AGG\‍(([^,\‍)]+)\‍)/i', 'STRING_AGG(\\1, \',\')', $line);
      //print $line."\n";
 
      if ($type == 'auto') {
        if (preg_match('/ALTER TABLE/i', $line)) {
          $type = 'dml';
        } elseif (preg_match('/CREATE TABLE/i', $line)) {
          $type = 'dml';
        } elseif (preg_match('/DROP TABLE/i', $line)) {
          $type = 'dml';
        }
      }
 
      $line = preg_replace('/ as signed\‍)/i', ' as integer)', $line);
 
      if ($type == 'dml') {
        $reg = array();
 
        $line = preg_replace('/\s/', ' ', $line); // Replace tabulation with space
 
        // we are inside create table statement so lets process datatypes
        if (preg_match('/(ISAM|innodb)/i', $line)) { // end of create table sequence
          $line = preg_replace('/\‍)[\s\t]*type[\s\t]*=[\s\t]*(MyISAM|innodb).*;/i', ');', $line);
          $line = preg_replace('/\‍)[\s\t]*engine[\s\t]*=[\s\t]*(MyISAM|innodb).*;/i', ');', $line);
          $line = preg_replace('/,$/', '', $line);
        }
 
        // Process case: "CREATE TABLE llx_mytable(rowid integer NOT NULL AUTO_INCREMENT PRIMARY KEY,code..."
        if (preg_match('/[\s\t\‍(]*(\w*)[\s\t]+int.*auto_increment/i', $line, $reg)) {
          $newline = preg_replace('/([\s\t\‍(]*)([a-zA-Z_0-9]*)[\s\t]+int.*auto_increment[^,]*/i', '\\1 \\2 SERIAL PRIMARY KEY', $line);
          //$line = "-- ".$line." replaced by --\n".$newline;
          $line = $newline;
        }
 
        if (preg_match('/[\s\t\‍(]*(\w*)[\s\t]+bigint.*auto_increment/i', $line, $reg)) {
          $newline = preg_replace('/([\s\t\‍(]*)([a-zA-Z_0-9]*)[\s\t]+bigint.*auto_increment[^,]*/i', '\\1 \\2 BIGSERIAL PRIMARY KEY', $line);
          //$line = "-- ".$line." replaced by --\n".$newline;
          $line = $newline;
        }
 
        // tinyint type conversion
        $line = preg_replace('/tinyint\‍(?[0-9]*\‍)?/', 'smallint', $line);
        $line = preg_replace('/tinyint/i', 'smallint', $line);
 
        // nuke unsigned
        $line = preg_replace('/(int\w+|smallint|bigint)\s+unsigned/i', '\\1', $line);
 
        // blob -> text
        $line = preg_replace('/\w*blob/i', 'text', $line);
 
        // tinytext/mediumtext -> text
        $line = preg_replace('/tinytext/i', 'text', $line);
        $line = preg_replace('/mediumtext/i', 'text', $line);
        $line = preg_replace('/longtext/i', 'text', $line);
 
        $line = preg_replace('/text\‍([0-9]+\‍)/i', 'text', $line);
 
        // change not null datetime field to null valid ones
        // (to support remapping of "zero time" to null
        $line = preg_replace('/datetime not null/i', 'datetime', $line);
        $line = preg_replace('/datetime/i', 'timestamp', $line);
 
        // double -> numeric
        $line = preg_replace('/^double/i', 'numeric', $line);
        $line = preg_replace('/(\s*)double/i', '\\1numeric', $line);
        // float -> numeric
        $line = preg_replace('/^float/i', 'numeric', $line);
        $line = preg_replace('/(\s*)float/i', '\\1numeric', $line);
 
        //Check tms timestamp field case (in Mysql this field is defautled to now and
        // on update defaulted by now
        $line = preg_replace('/(\s*)tms(\s*)timestamp/i', '\\1tms timestamp without time zone DEFAULT now() NOT NULL', $line);
 
        // nuke DEFAULT CURRENT_TIMESTAMP
        $line = preg_replace('/(\s*)DEFAULT(\s*)CURRENT_TIMESTAMP/i', '\\1', $line);
 
        // nuke ON UPDATE CURRENT_TIMESTAMP
        $line = preg_replace('/(\s*)ON(\s*)UPDATE(\s*)CURRENT_TIMESTAMP/i', '\\1', $line);
 
        // unique index(field1,field2)
        if (preg_match('/unique index\s*\‍((\w+\s*,\s*\w+)\‍)/i', $line)) {
          $line = preg_replace('/unique index\s*\‍((\w+\s*,\s*\w+)\‍)/i', 'UNIQUE\‍(\\1\‍)', $line);
        }
 
        // We remove end of requests "AFTER fieldxxx"
        $line = preg_replace('/\sAFTER [a-z0-9_]+/i', '', $line);
 
        // We remove start of requests "ALTER TABLE tablexxx" if this is a DROP INDEX
        $line = preg_replace('/ALTER TABLE [a-z0-9_]+\s+DROP INDEX/i', 'DROP INDEX', $line);
 
        // Translate order to rename fields
        if (preg_match('/ALTER TABLE ([a-z0-9_]+)\s+CHANGE(?: COLUMN)? ([a-z0-9_]+) ([a-z0-9_]+)(.*)$/i', $line, $reg)) {
          $line = "-- ".$line." replaced by --\n";
          $line .= "ALTER TABLE ".$reg[1]." RENAME COLUMN ".$reg[2]." TO ".$reg[3];
        }
 
        // Translate order to modify field format
        if (preg_match('/ALTER TABLE ([a-z0-9_]+)\s+MODIFY(?: COLUMN)? ([a-z0-9_]+) (.*)$/i', $line, $reg)) {
          $line = "-- ".$line." replaced by --\n";
          $newreg3 = $reg[3];
          $newreg3 = preg_replace('/ DEFAULT NULL/i', '', $newreg3);
          $newreg3 = preg_replace('/ NOT NULL/i', '', $newreg3);
          $newreg3 = preg_replace('/ NULL/i', '', $newreg3);
          $newreg3 = preg_replace('/ DEFAULT 0/i', '', $newreg3);
          $newreg3 = preg_replace('/ DEFAULT \'?[0-9a-zA-Z_@]*\'?/i', '', $newreg3);
          $line .= "ALTER TABLE ".$reg[1]." ALTER COLUMN ".$reg[2]." TYPE ".$newreg3;
          // TODO Add alter to set default value or null/not null if there is this in $reg[3]
        }
 
        // alter table add primary key (field1, field2 ...) -> We remove the primary key name not accepted by PostGreSQL
        // ALTER TABLE llx_dolibarr_modules ADD PRIMARY KEY pk_dolibarr_modules (numero, entity)
        if (preg_match('/ALTER\s+TABLE\s*(.*)\s*ADD\s+PRIMARY\s+KEY\s*(.*)\s*\‍((.*)$/i', $line, $reg)) {
          $line = "-- ".$line." replaced by --\n";
          $line .= "ALTER TABLE ".$reg[1]." ADD PRIMARY KEY (".$reg[3];
        }
 
        // Translate order to drop primary keys
        // ALTER TABLE llx_dolibarr_modules DROP PRIMARY KEY pk_xxx
        if (preg_match('/ALTER\s+TABLE\s*(.*)\s*DROP\s+PRIMARY\s+KEY\s*([^;]+)$/i', $line, $reg)) {
          $line = "-- ".$line." replaced by --\n";
          $line .= "ALTER TABLE ".$reg[1]." DROP CONSTRAINT ".$reg[2];
        }
 
        // Translate order to drop foreign keys
        // ALTER TABLE llx_dolibarr_modules DROP FOREIGN KEY fk_xxx
        if (preg_match('/ALTER\s+TABLE\s*(.*)\s*DROP\s+FOREIGN\s+KEY\s*(.*)$/i', $line, $reg)) {
          $line = "-- ".$line." replaced by --\n";
          $line .= "ALTER TABLE ".$reg[1]." DROP CONSTRAINT ".$reg[2];
        }
 
        // Translate order to add foreign keys
        // ALTER TABLE llx_tablechild ADD CONSTRAINT fk_tablechild_fk_fieldparent FOREIGN KEY (fk_fieldparent) REFERENCES llx_tableparent (rowid)
        if (preg_match('/ALTER\s+TABLE\s+(.*)\s*ADD CONSTRAINT\s+(.*)\s*FOREIGN\s+KEY\s*(.*)$/i', $line, $reg)) {
          $line = preg_replace('/;$/', '', $line);
          $line .= " DEFERRABLE INITIALLY IMMEDIATE;";
        }
 
        // alter table add [unique] [index] (field1, field2 ...)
        // ALTER TABLE llx_accountingaccount ADD INDEX idx_accountingaccount_fk_pcg_version (fk_pcg_version)
        if (preg_match('/ALTER\s+TABLE\s*(.*)\s*ADD\s+(UNIQUE INDEX|INDEX|UNIQUE)\s+(.*)\s*\‍(([\w,\s]+)\‍)/i', $line, $reg)) {
          $fieldlist = $reg[4];
          $idxname = $reg[3];
          $tablename = $reg[1];
          $line = "-- ".$line." replaced by --\n";
          $line .= "CREATE ".(preg_match('/UNIQUE/', $reg[2]) ? 'UNIQUE ' : '')."INDEX ".$idxname." ON ".$tablename." (".$fieldlist.")";
        }
      }
 
      // To have postgresql case sensitive
      $count_like = 0;
      $line = str_replace(' LIKE \'', ' ILIKE \'', $line, $count_like);
      if (getDolGlobalString('PSQL_USE_UNACCENT') && $count_like > 0) {
        // @see https://docs.postgresql.fr/11/unaccent.html : 'unaccent()' function must be installed before
        $line = preg_replace('/\s+(\‍(+\s*)([a-zA-Z0-9\-\_\.]+) ILIKE /', ' \1unaccent(\2) ILIKE ', $line);
      }
 
      $line = str_replace(' LIKE BINARY \'', ' LIKE \'', $line);
 
      // Replace INSERT IGNORE into INSERT
      $line = preg_replace('/^INSERT IGNORE/', 'INSERT', $line);
 
      // Delete using criteria on other table must not declare twice the deleted table
      // DELETE FROM tabletodelete USING tabletodelete, othertable -> DELETE FROM tabletodelete USING othertable
      if (preg_match('/DELETE FROM ([a-z_]+) USING ([a-z_]+), ([a-z_]+)/i', $line, $reg)) {
        if ($reg[1] == $reg[2]) { // If same table, we remove second one
          $line = preg_replace('/DELETE FROM ([a-z_]+) USING ([a-z_]+), ([a-z_]+)/i', 'DELETE FROM \\1 USING \\3', $line);
        }
      }
 
      // Remove () in the tables in FROM if 1 table
      $line = preg_replace('/FROM\s*\‍((([a-z_]+)\s+as\s+([a-z_]+)\s*)\‍)/i', 'FROM \\1', $line);
      //print $line."\n";
 
      // Remove () in the tables in FROM if 2 table
      $line = preg_replace('/FROM\s*\‍(([a-z_]+\s+as\s+[a-z_]+)\s*,\s*([a-z_]+\s+as\s+[a-z_]+\s*)\‍)/i', 'FROM \\1, \\2', $line);
      //print $line."\n";
 
      // Remove () in the tables in FROM if 3 table
      $line = preg_replace('/FROM\s*\‍(([a-z_]+\s+as\s+[a-z_]+)\s*,\s*([a-z_]+\s+as\s+[a-z_]+\s*),\s*([a-z_]+\s+as\s+[a-z_]+\s*)\‍)/i', 'FROM \\1, \\2, \\3', $line);
      //print $line."\n";
 
      // Remove () in the tables in FROM if 4 table
      $line = preg_replace('/FROM\s*\‍(([a-z_]+\s+as\s+[a-z_]+)\s*,\s*([a-z_]+\s+as\s+[a-z_]+\s*),\s*([a-z_]+\s+as\s+[a-z_]+\s*),\s*([a-z_]+\s+as\s+[a-z_]+\s*)\‍)/i', 'FROM \\1, \\2, \\3, \\4', $line);
      //print $line."\n";
 
      // Remove () in the tables in FROM if 5 table
      $line = preg_replace('/FROM\s*\‍(([a-z_]+\s+as\s+[a-z_]+)\s*,\s*([a-z_]+\s+as\s+[a-z_]+\s*),\s*([a-z_]+\s+as\s+[a-z_]+\s*),\s*([a-z_]+\s+as\s+[a-z_]+\s*),\s*([a-z_]+\s+as\s+[a-z_]+\s*)\‍)/i', 'FROM \\1, \\2, \\3, \\4, \\5', $line);
      //print $line."\n";
 
      // Replace espacing \' by ''.
      // By default we do not (should be already done by db->escape function if required
      // except for sql insert in data file that are mysql escaped so we removed them to
      // be compatible with standard_conforming_strings=on that considers \ as ordinary character).
      if ($unescapeslashquot) {
        $line = preg_replace("/\\\'/", "''", $line);
      }
 
      //print "type=".$type." newline=".$line."<br>\n";
    }
 
    return $line;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function select_db($database)
  {
    // phpcs:enable
    if ($database == $this->database_name) {
      return true;
    } else {
      return false;
    }
  }
 
  public function connect($host, $login, $passwd, $name, $port = 0)
  {
    // use pg_pconnect() instead of pg_connect() if you want to use persistent connection costing 1ms, instead of 30ms for non persistent
 
    $this->db = false;
 
    // connections parameters must be protected (only \ and ' according to pg_connect() manual)
    $host = str_replace(array("\\", "'"), array("\\\\", "\\'"), $host);
    $login = str_replace(array("\\", "'"), array("\\\\", "\\'"), $login);
    $passwd = str_replace(array("\\", "'"), array("\\\\", "\\'"), $passwd);
    $name = str_replace(array("\\", "'"), array("\\\\", "\\'"), $name);
    $port = str_replace(array("\\", "'"), array("\\\\", "\\'"), $port);
 
    if (!$name) {
      $name = "postgres"; // When try to connect using admin user
    }
 
    // try first Unix domain socket (local)
    if ((!empty($host) && $host == "socket") && !defined('NOLOCALSOCKETPGCONNECT')) {
      $con_string = "dbname='".$name."' user='".$login."' password='".$passwd."'"; // $name may be empty
      try {
        $this->db = @pg_connect($con_string);
      } catch (Exception $e) {
        // No message
      }
    }
 
    // if local connection failed or not requested, use TCP/IP
    if (empty($this->db)) {
      if (!$host) {
        $host = "localhost";
      }
      if (!$port) {
        $port = 5432;
      }
 
      $con_string = "host='".$host."' port='".$port."' dbname='".$name."' user='".$login."' password='".$passwd."'";
      try {
        $this->db = @pg_connect($con_string);
      } catch (Exception $e) {
        print $e->getMessage();
      }
    }
 
    // now we test if at least one connect method was a success
    if ($this->db) {
      $this->database_name = $name;
      pg_set_error_verbosity($this->db, PGSQL_ERRORS_VERBOSE); // Set verbosity to max
      pg_query($this->db, "set datestyle = 'ISO, YMD';");
    }
 
    return $this->db;
  }
 
  public function getVersion()
  {
    $resql = $this->query('SHOW server_version');
    if ($resql) {
      $liste = $this->fetch_array($resql);
      return $liste['server_version'];
    }
    return '';
  }
 
  public function getDriverInfo()
  {
    return 'pgsql php driver';
  }
 
  public function close()
  {
    if ($this->db) {
      if ($this->transaction_opened > 0) {
        dol_syslog(get_class($this)."::close Closing a connection with an opened transaction depth=".$this->transaction_opened, LOG_ERR);
      }
      $this->connected = false;
      return pg_close($this->db);
    }
    return false;
  }
 
  public function query($query, $usesavepoint = 0, $type = 'auto', $result_mode = 0)
  {
    global $conf, $dolibarr_main_db_readonly;
 
    $query = trim($query);
 
    // Convert MySQL syntax to PostgresSQL syntax
    $query = $this->convertSQLFromMysql($query, $type, ($this->unescapeslashquot && $this->standard_conforming_strings));
    //print "After convertSQLFromMysql:\n".$query."<br>\n";
 
    if (getDolGlobalString('MAIN_DB_AUTOFIX_BAD_SQL_REQUEST')) {
      // Fix bad formed requests. If request contains a date without quotes, we fix this but this should not occurs.
      $loop = true;
      while ($loop) {
        if (preg_match('/([^\'])([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9])/', $query)) {
          $query = preg_replace('/([^\'])([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9])/', '\\1\'\\2\'', $query);
          dol_syslog("Warning: Bad formed request converted into ".$query, LOG_WARNING);
        } else {
          $loop = false;
        }
      }
    }
 
    if ($usesavepoint && $this->transaction_opened) {
      @pg_query($this->db, 'SAVEPOINT mysavepoint');
    }
 
    if (!in_array($query, array('BEGIN', 'COMMIT', 'ROLLBACK'))) {
      $SYSLOG_SQL_LIMIT = 10000; // limit log to 10kb per line to limit DOS attacks
      dol_syslog('sql='.substr($query, 0, $SYSLOG_SQL_LIMIT), LOG_DEBUG);
    }
    if (empty($query)) {
      return false; // Return false = error if empty request
    }
 
    if (!empty($dolibarr_main_db_readonly)) {
      if (preg_match('/^(INSERT|UPDATE|REPLACE|DELETE|CREATE|ALTER|TRUNCATE|DROP)/i', $query)) {
        $this->lasterror = 'Application in read-only mode';
        $this->lasterrno = 'APPREADONLY';
        $this->lastquery = $query;
        return false;
      }
    }
 
    $ret = @pg_query($this->db, $query);
 
    //print $query;
    if (!preg_match("/^COMMIT/i", $query) && !preg_match("/^ROLLBACK/i", $query)) { // Si requete utilisateur, on la sauvegarde ainsi que son resultset
      if (!$ret) {
        if ($this->errno() != 'DB_ERROR_25P02') { // Do not overwrite errors if this is a consecutive error
          $this->lastqueryerror = $query;
          $this->lasterror = $this->error();
          $this->lasterrno = $this->errno();
 
          if (getDolGlobalInt('SYSLOG_LEVEL') < LOG_DEBUG) {
            dol_syslog(get_class($this)."::query SQL Error query: ".$query, LOG_ERR); // Log of request was not yet done previously
          }
          dol_syslog(get_class($this)."::query SQL Error message: ".$this->lasterror." (".$this->lasterrno.")", LOG_ERR);
          dol_syslog(get_class($this)."::query SQL Error usesavepoint = ".$usesavepoint, LOG_ERR);
        }
 
        if ($usesavepoint && $this->transaction_opened) { // Warning, after that errno will be erased
          @pg_query($this->db, 'ROLLBACK TO SAVEPOINT mysavepoint');
        }
      }
      $this->lastquery = $query;
      $this->_results = $ret;
    }
 
    return $ret;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function fetch_object($resultset)
  {
    // phpcs:enable
    // If resultset not provided, we take the last used by connexion
    if (!is_resource($resultset) && !is_object($resultset)) {
      $resultset = $this->_results;
    }
    return pg_fetch_object($resultset);
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function fetch_array($resultset)
  {
    // phpcs:enable
    // If resultset not provided, we take the last used by connexion
    if (!is_resource($resultset) && !is_object($resultset)) {
      $resultset = $this->_results;
    }
    return pg_fetch_array($resultset);
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function fetch_row($resultset)
  {
    // phpcs:enable
    // Si le resultset n'est pas fourni, on prend le dernier utilise sur cette connexion
    if (!is_resource($resultset) && !is_object($resultset)) {
      $resultset = $this->_results;
    }
    return pg_fetch_row($resultset);
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function num_rows($resultset)
  {
    // phpcs:enable
    // If resultset not provided, we take the last used by connexion
    if (!is_resource($resultset) && !is_object($resultset)) {
      $resultset = $this->_results;
    }
    return pg_num_rows($resultset);
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function affected_rows($resultset)
  {
    // phpcs:enable
    // If resultset not provided, we take the last used by connexion
    if (!is_resource($resultset) && !is_object($resultset)) {
      $resultset = $this->_results;
    }
    // pgsql necessite un resultset pour cette fonction contrairement
    // a mysql qui prend un link de base
    return pg_affected_rows($resultset);
  }
 
 
  public function free($resultset = null)
  {
    // If resultset not provided, we take the last used by connexion
    if (!is_resource($resultset) && !is_object($resultset)) {
      $resultset = $this->_results;
    }
    // Si resultset en est un, on libere la memoire
    if (is_resource($resultset) || is_object($resultset)) {
      pg_free_result($resultset);
    }
  }
 
 
  public function plimit($limit = 0, $offset = 0)
  {
    global $conf;
    if (empty($limit)) {
      return "";
    }
    if ($limit < 0) {
      $limit = $conf->liste_limit;
    }
    if ($offset > 0) {
      return " LIMIT ".$limit." OFFSET ".$offset." ";
    } else {
      return " LIMIT $limit ";
    }
  }
 
 
  public function escape($stringtoencode)
  {
    return pg_escape_string($stringtoencode);
  }
 
  public function escapeforlike($stringtoencode)
  {
    return str_replace(array('\\', '_', '%'), array('\\\\', '\_', '\%'), (string) $stringtoencode);
  }
 
  public function ifsql($test, $resok, $resko)
  {
    return '(CASE WHEN '.$test.' THEN '.$resok.' ELSE '.$resko.' END)';
  }
 
  public function regexpsql($subject, $pattern, $sqlstring = 0)
  {
    if ($sqlstring) {
      return "(". $subject ." ~ '" . $pattern . "')";
    }
 
    return "('". $subject ."' ~ '" . $pattern . "')";
  }
 
 
  public function errno()
  {
    if (!$this->connected) {
      // Si il y a eu echec de connexion, $this->db n'est pas valide.
      return 'DB_ERROR_FAILED_TO_CONNECT';
    } else {
      // Constants to convert error code to a generic Dolibarr error code
      $errorcode_map = array(
      1004 => 'DB_ERROR_CANNOT_CREATE',
      1005 => 'DB_ERROR_CANNOT_CREATE',
      1006 => 'DB_ERROR_CANNOT_CREATE',
      1007 => 'DB_ERROR_ALREADY_EXISTS',
      1008 => 'DB_ERROR_CANNOT_DROP',
      1025 => 'DB_ERROR_NO_FOREIGN_KEY_TO_DROP',
      1044 => 'DB_ERROR_ACCESSDENIED',
      1046 => 'DB_ERROR_NODBSELECTED',
      1048 => 'DB_ERROR_CONSTRAINT',
      '42P07' => 'DB_ERROR_TABLE_OR_KEY_ALREADY_EXISTS',
      '42703' => 'DB_ERROR_NOSUCHFIELD',
      1060 => 'DB_ERROR_COLUMN_ALREADY_EXISTS',
      42701=> 'DB_ERROR_COLUMN_ALREADY_EXISTS',
      '42710' => 'DB_ERROR_KEY_NAME_ALREADY_EXISTS',
      '23505' => 'DB_ERROR_RECORD_ALREADY_EXISTS',
      '42704' => 'DB_ERROR_NO_INDEX_TO_DROP', // May also be Type xxx does not exists
      '42601' => 'DB_ERROR_SYNTAX',
      '42P16' => 'DB_ERROR_PRIMARY_KEY_ALREADY_EXISTS',
      1075 => 'DB_ERROR_CANT_DROP_PRIMARY_KEY',
      1091 => 'DB_ERROR_NOSUCHFIELD',
      1100 => 'DB_ERROR_NOT_LOCKED',
      1136 => 'DB_ERROR_VALUE_COUNT_ON_ROW',
      '42P01' => 'DB_ERROR_NOSUCHTABLE',
      '23503' => 'DB_ERROR_NO_PARENT',
      1217 => 'DB_ERROR_CHILD_EXISTS',
      1451 => 'DB_ERROR_CHILD_EXISTS',
      '42P04' => 'DB_DATABASE_ALREADY_EXISTS'
      );
 
      $errorlabel = pg_last_error($this->db);
      $errorcode = '';
      $reg = array();
      if (preg_match('/: *([0-9P]+):/', $errorlabel, $reg)) {
        $errorcode = $reg[1];
        if (isset($errorcode_map[$errorcode])) {
          return $errorcode_map[$errorcode];
        }
      }
      $errno = $errorcode ? $errorcode : $errorlabel;
      return ($errno ? 'DB_ERROR_'.$errno : '0');
    }
    //                '/(Table does not exist\.|Relation [\"\'].*[\"\'] does not exist|sequence does not exist|class ".+" not found)$/' => 'DB_ERROR_NOSUCHTABLE',
    //                '/table [\"\'].*[\"\'] does not exist/' => 'DB_ERROR_NOSUCHTABLE',
    //                '/Relation [\"\'].*[\"\'] already exists|Cannot insert a duplicate key into (a )?unique index.*/'      => 'DB_ERROR_RECORD_ALREADY_EXISTS',
    //                '/divide by zero$/'                     => 'DB_ERROR_DIVZERO',
    //                '/pg_atoi: error in .*: can\'t parse /' => 'DB_ERROR_INVALID_NUMBER',
    //                '/ttribute [\"\'].*[\"\'] not found$|Relation [\"\'].*[\"\'] does not have attribute [\"\'].*[\"\']/' => 'DB_ERROR_NOSUCHFIELD',
    //                '/parser: parse error at or near \"/'   => 'DB_ERROR_SYNTAX',
    //                '/referential integrity violation/'     => 'DB_ERROR_CONSTRAINT'
  }
 
  public function error()
  {
    return pg_last_error($this->db);
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function last_insert_id($tab, $fieldid = 'rowid')
  {
    // phpcs:enable
    //$result = pg_query($this->db,"SELECT MAX(".$fieldid.") FROM ".$tab);
    $result = pg_query($this->db, "SELECT currval('".$tab."_".$fieldid."_seq')");
    if (!$result) {
      print pg_last_error($this->db);
      exit;
    }
    //$nbre = pg_num_rows($result);
    $row = pg_fetch_result($result, 0, 0);
    return $row;
  }
 
  public function encrypt($fieldorvalue, $withQuotes = 1)
  {
    global $conf;
 
    // Type of encryption (2: AES (recommended), 1: DES , 0: no encryption)
    //$cryptType = ($conf->db->dolibarr_main_db_encryption ? $conf->db->dolibarr_main_db_encryption : 0);
 
    //Encryption key
    //$cryptKey = (!empty($conf->db->dolibarr_main_db_cryptkey) ? $conf->db->dolibarr_main_db_cryptkey : '');
 
    $return = $fieldorvalue;
    return ($withQuotes ? "'" : "").$this->escape($return).($withQuotes ? "'" : "");
  }
 
 
  public function decrypt($value)
  {
    global $conf;
 
    // Type of encryption (2: AES (recommended), 1: DES , 0: no encryption)
    //$cryptType = ($conf->db->dolibarr_main_db_encryption ? $conf->db->dolibarr_main_db_encryption : 0);
 
    //Encryption key
    //$cryptKey = (!empty($conf->db->dolibarr_main_db_cryptkey) ? $conf->db->dolibarr_main_db_cryptkey : '');
 
    $return = $value;
    return $return;
  }
 
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLGetConnectId()
  {
    // phpcs:enable
    return '?';
  }
 
 
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLCreateDb($database, $charset = '', $collation = '', $owner = '')
  {
    // phpcs:enable
    if (empty($charset)) {
      $charset = $this->forcecharset;
    }
    if (empty($collation)) {
      $collation = $this->forcecollate;
    }
 
    // Test charset match LC_TYPE (pgsql error otherwise)
    //print $charset.' '.setlocale(LC_CTYPE,'0'); exit;
 
    // NOTE: Do not use ' around the database name
    $sql = "CREATE DATABASE ".$this->escape($database)." OWNER '".$this->escape($owner)."' ENCODING '".$this->escape($charset)."'";
    dol_syslog($sql, LOG_DEBUG);
    $ret = $this->query($sql);
    return $ret;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLListTables($database, $table = '')
  {
    // phpcs:enable
    $listtables = array();
 
    $escapedlike = '';
    if ($table) {
      $tmptable = preg_replace('/[^a-z0-9\.\-\_%]/i', '', $table);
 
      $escapedlike = " AND table_name LIKE '".$this->escape($tmptable)."'";
    }
    $result = pg_query($this->db, "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'".$escapedlike." ORDER BY table_name");
    if ($result) {
      while ($row = $this->fetch_row($result)) {
        $listtables[] = $row[0];
      }
    }
    return $listtables;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLListTablesFull($database, $table = '')
  {
    // phpcs:enable
    $listtables = array();
 
    $escapedlike = '';
    if ($table) {
      $tmptable = preg_replace('/[^a-z0-9\.\-\_%]/i', '', $table);
 
      $escapedlike = " AND table_name LIKE '".$this->escape($tmptable)."'";
    }
    $result = pg_query($this->db, "SELECT table_name, table_type FROM information_schema.tables WHERE table_schema = 'public'".$escapedlike." ORDER BY table_name");
    if ($result) {
      while ($row = $this->fetch_row($result)) {
        $listtables[] = $row;
      }
    }
    return $listtables;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLInfoTable($table)
  {
    // phpcs:enable
    $infotables = array();
 
    $sql = "SELECT ";
    $sql .= " infcol.column_name as \"Column\",";
    $sql .= " CASE WHEN infcol.character_maximum_length IS NOT NULL THEN infcol.udt_name || '('||infcol.character_maximum_length||')'";
    $sql .= "   ELSE infcol.udt_name";
    $sql .= " END as \"Type\",";
    $sql .= " infcol.collation_name as \"Collation\",";
    $sql .= " infcol.is_nullable as \"Null\",";
    $sql .= " '' as \"Key\",";
    $sql .= " infcol.column_default as \"Default\",";
    $sql .= " '' as \"Extra\",";
    $sql .= " '' as \"Privileges\"";
    $sql .= " FROM information_schema.columns infcol";
    $sql .= " WHERE table_schema = 'public' ";
    $sql .= " AND table_name = '".$this->escape($table)."'";
    $sql .= " ORDER BY ordinal_position;";
 
    dol_syslog($sql, LOG_DEBUG);
    $result = $this->query($sql);
    if ($result) {
      while ($row = $this->fetch_row($result)) {
        $infotables[] = $row;
      }
    }
    return $infotables;
  }
 
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLCreateTable($table, $fields, $primary_key, $type, $unique_keys = null, $fulltext_keys = null, $keys = null)
  {
    // phpcs:enable
    // FIXME: $fulltext_keys parameter is unused
 
    // cles recherchees dans le tableau des descriptions (fields) : type,value,attribute,null,default,extra
    // ex. : $fields['rowid'] = array('type'=>'int','value'=>'11','null'=>'not null','extra'=> 'auto_increment');
    $sql = "create table ".$table."(";
    $i = 0;
    foreach ($fields as $field_name => $field_desc) {
      $sqlfields[$i] = $field_name." ";
      $sqlfields[$i] .= $field_desc['type'];
      if (preg_match("/^[^\s]/i", $field_desc['value'])) {
        $sqlfields[$i] .= "(".$field_desc['value'].")";
      } elseif (preg_match("/^[^\s]/i", $field_desc['attribute'])) {
        $sqlfields[$i] .= " ".$field_desc['attribute'];
      } elseif (preg_match("/^[^\s]/i", $field_desc['default'])) {
        if (preg_match("/null/i", $field_desc['default'])) {
          $sqlfields[$i] .= " default ".$field_desc['default'];
        } else {
          $sqlfields[$i] .= " default '".$this->escape($field_desc['default'])."'";
        }
      } elseif (preg_match("/^[^\s]/i", $field_desc['null'])) {
        $sqlfields[$i]  .= " ".$field_desc['null'];
      } elseif (preg_match("/^[^\s]/i", $field_desc['extra'])) {
        $sqlfields[$i]  .= " ".$field_desc['extra'];
      }
      $i++;
    }
    if ($primary_key != "") {
      $pk = "primary key(".$primary_key.")";
    }
 
    if (is_array($unique_keys)) {
      $i = 0;
      foreach ($unique_keys as $key => $value) {
        $sqluq[$i] = "UNIQUE KEY '".$key."' ('".$this->escape($value)."')";
        $i++;
      }
    }
    if (is_array($keys)) {
      $i = 0;
      foreach ($keys as $key => $value) {
        $sqlk[$i] = "KEY ".$key." (".$value.")";
        $i++;
      }
    }
    $sql .= implode(',', $sqlfields);
    if ($primary_key != "") {
      $sql .= ",".$pk;
    }
    if (is_array($unique_keys)) {
      $sql .= ",".implode(',', $sqluq);
    }
    if (is_array($keys)) {
      $sql .= ",".implode(',', $sqlk);
    }
    $sql .= ") type=".$type;
 
    dol_syslog($sql, LOG_DEBUG);
    if (!$this->query($sql)) {
      return -1;
    } else {
      return 1;
    }
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLDropTable($table)
  {
    // phpcs:enable
    $tmptable = preg_replace('/[^a-z0-9\.\-\_]/i', '', $table);
 
    $sql = "DROP TABLE ".$tmptable;
 
    if (!$this->query($sql)) {
      return -1;
    } else {
      return 1;
    }
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLCreateUser($dolibarr_main_db_host, $dolibarr_main_db_user, $dolibarr_main_db_pass, $dolibarr_main_db_name)
  {
    // phpcs:enable
    // Note: using ' on user does not works with pgsql
    $sql = "CREATE USER ".$this->escape($dolibarr_main_db_user)." with password '".$this->escape($dolibarr_main_db_pass)."'";
 
    dol_syslog(get_class($this)."::DDLCreateUser", LOG_DEBUG); // No sql to avoid password in log
    $resql = $this->query($sql);
    if (!$resql) {
      return -1;
    }
 
    return 1;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLDescTable($table, $field = "")
  {
    // phpcs:enable
    $sql = "SELECT attname FROM pg_attribute, pg_type WHERE typname = '".$this->escape($table)."' AND attrelid = typrelid";
    $sql .= " AND attname NOT IN ('cmin', 'cmax', 'ctid', 'oid', 'tableoid', 'xmin', 'xmax')";
    if ($field) {
      $sql .= " AND attname = '".$this->escape($field)."'";
    }
 
    dol_syslog($sql, LOG_DEBUG);
    $this->_results = $this->query($sql);
    return $this->_results;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLAddField($table, $field_name, $field_desc, $field_position = "")
  {
    // phpcs:enable
    // cles recherchees dans le tableau des descriptions (field_desc) : type,value,attribute,null,default,extra
    // ex. : $field_desc = array('type'=>'int','value'=>'11','null'=>'not null','extra'=> 'auto_increment');
    $sql = "ALTER TABLE ".$table." ADD ".$field_name." ";
    $sql .= $field_desc['type'];
    if (preg_match("/^[^\s]/i", $field_desc['value'])) {
      if (!in_array($field_desc['type'], array('smallint', 'int', 'date', 'datetime')) && $field_desc['value']) {
        $sql .= "(".$field_desc['value'].")";
      }
    }
    if (preg_match("/^[^\s]/i", $field_desc['attribute'])) {
      $sql .= " ".$field_desc['attribute'];
    }
    if (preg_match("/^[^\s]/i", $field_desc['null'])) {
      $sql .= " ".$field_desc['null'];
    }
    if (preg_match("/^[^\s]/i", $field_desc['default'])) {
      if (preg_match("/null/i", $field_desc['default'])) {
        $sql .= " default ".$field_desc['default'];
      } else {
        $sql .= " default '".$this->escape($field_desc['default'])."'";
      }
    }
    if (preg_match("/^[^\s]/i", $field_desc['extra'])) {
      $sql .= " ".$field_desc['extra'];
    }
    $sql .= " ".$field_position;
 
    dol_syslog($sql, LOG_DEBUG);
    if (!$this -> query($sql)) {
      return -1;
    }
    return 1;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLUpdateField($table, $field_name, $field_desc)
  {
    // phpcs:enable
    $sql = "ALTER TABLE ".$table;
    $sql .= " ALTER COLUMN ".$this->escape($field_name)." TYPE ".$field_desc['type'];
    if (preg_match("/^[^\s]/i", $field_desc['value'])) {
      if (!in_array($field_desc['type'], array('smallint', 'int', 'date', 'datetime')) && $field_desc['value']) {
        $sql .= "(".$field_desc['value'].")";
      }
    }
 
    if ($field_desc['null'] == 'not null' || $field_desc['null'] == 'NOT NULL') {
      // We will try to change format of column to NOT NULL. To be sure the ALTER works, we try to update fields that are NULL
      if ($field_desc['type'] == 'varchar' || $field_desc['type'] == 'text') {
        $sqlbis = "UPDATE ".$table." SET ".$this->escape($field_name)." = '".$this->escape(isset($field_desc['default']) ? $field_desc['default'] : '')."' WHERE ".$this->escape($field_name)." IS NULL";
        $this->query($sqlbis);
      } elseif ($field_desc['type'] == 'tinyint' || $field_desc['type'] == 'int') {
        $sqlbis = "UPDATE ".$table." SET ".$this->escape($field_name)." = ".((int) $this->escape(isset($field_desc['default']) ? $field_desc['default'] : 0))." WHERE ".$this->escape($field_name)." IS NULL";
        $this->query($sqlbis);
      }
    }
 
    if (isset($field_desc['default']) && $field_desc['default'] != '') {
      if ($field_desc['type'] == 'double' || $field_desc['type'] == 'tinyint' || $field_desc['type'] == 'int') {
        $sql .= ", ALTER COLUMN ".$this->escape($field_name)." SET DEFAULT ".((float) $field_desc['default']);
      } elseif ($field_desc['type'] != 'text') {  // Default not supported on text fields ?
        $sql .= ", ALTER COLUMN ".$this->escape($field_name)." SET DEFAULT '".$this->escape($field_desc['default'])."'";
      }
    }
 
    dol_syslog($sql, LOG_DEBUG);
    if (!$this->query($sql)) {
      return -1;
    }
    return 1;
  }
 
  // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
  public function DDLDropField($table, $field_name)
  {
    // phpcs:enable
    $tmp_field_name = preg_replace('/[^a-z0-9\.\-\_]/i', '', $field_name);
 
    $sql = "ALTER TABLE ".$table." DROP COLUMN ".$tmp_field_name;
    if (!$this->query($sql)) {
      $this->error = $this->lasterror();
      return -1;
    }
    return 1;
  }
 
  public function getDefaultCharacterSetDatabase()
  {
    $resql = $this->query('SHOW SERVER_ENCODING');
    if ($resql) {
      $liste = $this->fetch_array($resql);
      return $liste['server_encoding'];
    } else {
      return '';
    }
  }
 
  public function getListOfCharacterSet()
  {
    $resql = $this->query('SHOW SERVER_ENCODING');
    $liste = array();
    if ($resql) {
      $i = 0;
      while ($obj = $this->fetch_object($resql)) {
        $liste[$i]['charset'] = $obj->server_encoding;
        $liste[$i]['description'] = 'Default database charset';
        $i++;
      }
      $this->free($resql);
    } else {
      return null;
    }
    return $liste;
  }
 
  public function getDefaultCollationDatabase()
  {
    $resql = $this->query('SHOW LC_COLLATE');
    if ($resql) {
      $liste = $this->fetch_array($resql);
      return $liste['lc_collate'];
    } else {
      return '';
    }
  }
 
  public function getListOfCollation()
  {
    $resql = $this->query('SHOW LC_COLLATE');
    $liste = array();
    if ($resql) {
      $i = 0;
      while ($obj = $this->fetch_object($resql)) {
        $liste[$i]['collation'] = $obj->lc_collate;
        $i++;
      }
      $this->free($resql);
    } else {
      return null;
    }
    return $liste;
  }
 
  public function getPathOfDump()
  {
    $fullpathofdump = '/pathtopgdump/pg_dump';
 
    if (file_exists('/usr/bin/pg_dump')) {
      $fullpathofdump = '/usr/bin/pg_dump';
    } else {
      // TODO L'utilisateur de la base doit etre un superadmin pour lancer cette commande
      $resql = $this->query('SHOW data_directory');
      if ($resql) {
        $liste = $this->fetch_array($resql);
        $basedir = $liste['data_directory'];
        $fullpathofdump = preg_replace('/data$/', 'bin', $basedir).'/pg_dump';
      }
    }
 
    return $fullpathofdump;
  }
 
  public function getPathOfRestore()
  {
    //$tool='pg_restore';
    $tool = 'psql';
 
    $fullpathofdump = '/pathtopgrestore/'.$tool;
 
    if (file_exists('/usr/bin/'.$tool)) {
      $fullpathofdump = '/usr/bin/'.$tool;
    } else {
      // TODO L'utilisateur de la base doit etre un superadmin pour lancer cette commande
      $resql = $this->query('SHOW data_directory');
      if ($resql) {
        $liste = $this->fetch_array($resql);
        $basedir = $liste['data_directory'];
        $fullpathofdump = preg_replace('/data$/', 'bin', $basedir).'/'.$tool;
      }
    }
 
    return $fullpathofdump;
  }
 
  public function getServerParametersValues($filter = '')
  {
    $result = array();
 
    $resql = 'select name,setting from pg_settings';
    if ($filter) {
      $resql .= " WHERE name = '".$this->escape($filter)."'";
    }
    $resql = $this->query($resql);
    if ($resql) {
      while ($obj = $this->fetch_object($resql)) {
        $result[$obj->name] = $obj->setting;
      }
    }
 
    return $result;
  }
 
  public function getServerStatusValues($filter = '')
  {
    /* This is to return current running requests.
    $sql='SELECT datname,procpid,current_query FROM pg_stat_activity ORDER BY procpid';
    if ($filter) $sql.=" LIKE '".$this->escape($filter)."'";
    $resql=$this->query($sql);
    if ($resql)
    {
      $obj=$this->fetch_object($resql);
      $result[$obj->Variable_name]=$obj->Value;
    }
    */
 
    return array();
  }
}