<?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/>.
 */

/**
 *	\file       htdocs/core/db/pgsql.class.php
 *	\brief      Fichier de la classe permettant de gerer une base pgsql
 */

require_once DOL_DOCUMENT_ROOT.'/core/db/DoliDB.class.php';

/**
 *	Class to drive a Postgresql database for Dolibarr
 */
class DoliDBPgsql extends DoliDB
{
	//! Database type
	public $type = 'pgsql'; // Name of manager

	//! Database label
	const LABEL = 'PostgreSQL'; // Label of manager

	//! Charset
	public $forcecharset = 'UTF8'; // Can't be static as it may be forced with a dynamic value

	//! Collate used to force collate when creating database
	public $forcecollate = ''; // Can't be static as it may be forced with a dynamic value

	//! Version min database
	const VERSIONMIN = '9.0.0'; // Version min database

	/** @var resource|boolean Resultset of last query */
	private $_results;

	public $unescapeslashquot;
	public $standard_conforming_strings;


	/**
	 *	Constructor.
	 *	This create an opened connexion to a database server and eventually to a database
	 *
	 *	@param      string	$type		Type of database (mysql, pgsql...)
	 *	@param	    string	$host		Address of database server
	 *	@param	    string	$user		Nom de l'utilisateur autorise
	 *	@param	    string	$pass		Mot de passe
	 *	@param	    string	$name		Nom de la database
	 *	@param	    int		$port		Port of database server
	 */
	public function __construct($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 $this->ok;
		}

		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 $this->ok;
		}

		// 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;
		}

		return $this->ok;
	}


	/**
	 *  Convert a SQL request in Mysql syntax to native syntax
	 *
	 *  @param  string	$line   			SQL request line to convert
	 *  @param  string	$type				Type of SQL order ('ddl' for insert, update, select, delete or 'dml' for create, alter...)
	 *  @param	bool	$unescapeslashquot	Unescape slash quote with quote quote
	 *  @return string   					SQL request line converted
	 */
	public static function convertSQLFromMysql($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, $count_like);
			if (!empty($conf->global->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
	/**
	 *  Select a database
	 *  Ici postgresql n'a aucune fonction equivalente de mysql_select_db
	 *  On compare juste manuellement si la database choisie est bien celle activee par la connexion
	 *
	 *	@param	    string	$database	Name of database
	 *	@return	    bool				true if OK, false if KO
	 */
	public function select_db($database)
	{
		// phpcs:enable
		if ($database == $this->database_name) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 *	Connexion to server
	 *
	 *	@param	    string		$host		Database server host
	 *	@param	    string		$login		Login
	 *	@param	    string		$passwd		Password
	 *	@param		string		$name		Name of database (not used for mysql, used for pgsql)
	 *	@param		integer		$port		Port of database server
	 *	@return		bool|resource			Database access handler
	 *	@see		close()
	 */
	public function connect($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;
	}

	/**
	 *	Return version of database server
	 *
	 *	@return	        string      Version string
	 */
	public function getVersion()
	{
		$resql = $this->query('SHOW server_version');
		if ($resql) {
			$liste = $this->fetch_array($resql);
			return $liste['server_version'];
		}
		return '';
	}

	/**
	 *	Return version of database client driver
	 *
	 *	@return	        string      Version string
	 */
	public function getDriverInfo()
	{
		return 'pgsql php driver';
	}

	/**
	 *  Close database connexion
	 *
	 *  @return     boolean     True if disconnect successfull, false otherwise
	 *  @see        connect()
	 */
	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;
	}

	/**
	 * Convert request to PostgreSQL syntax, execute it and return the resultset
	 *
	 * @param	string	$query			SQL query string
	 * @param	int		$usesavepoint	0=Default mode, 1=Run a savepoint before and a rollback to savepoint if error (this allow to have some request with errors inside global transactions).
	 * @param   string	$type           Type of SQL order ('ddl' for insert, update, select, delete or 'dml' for create, alter...)
	 * @param	int		$result_mode	Result mode (not used with pgsql)
	 * @return	bool|resource			Resultset of answer
	 */
	public function query($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 (!empty($conf->global->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 ($conf->global->SYSLOG_LEVEL < LOG_DEBUG) {
						dol_syslog(get_class($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
	/**
	 * 	Returns the current line (as an object) for the resultset cursor
	 *
	 *	@param	resource	$resultset  Curseur de la requete voulue
	 *	@return	false|object			Object result line or false if KO or end of cursor
	 */
	public function fetch_object($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
	/**
	 *	Return datas as an array
	 *
	 *	@param	resource	$resultset  Resultset of request
	 *	@return	false|array				Array
	 */
	public function fetch_array($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
	/**
	 *	Return datas as an array
	 *
	 *	@param	resource	$resultset  Resultset of request
	 *	@return	false|array				Array
	 */
	public function fetch_row($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
	/**
	 *	Return number of lines for result of a SELECT
	 *
	 *	@param	resource	$resultset  Resulset of requests
	 *	@return int		    			Nb of lines, -1 on error
	 *	@see    affected_rows()
	 */
	public function num_rows($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
	/**
	 * Return the number of lines in the result of a request INSERT, DELETE or UPDATE
	 *
	 * @param	resource	$resultset  Result set of request
	 * @return  int		    			Nb of lines
	 * @see 	num_rows()
	 */
	public function affected_rows($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);
	}


	/**
	 * Libere le dernier resultset utilise sur cette connexion
	 *
	 * @param	resource	$resultset  Result set of request
	 * @return	void
	 */
	public function free($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);
		}
	}


	/**
	 *	Define limits and offset of request
	 *
	 *	@param	int		$limit      Maximum number of lines returned (-1=conf->liste_limit, 0=no limit)
	 *	@param	int		$offset     Numero of line from where starting fetch
	 *	@return	string      		String with SQL syntax to add a limit and offset
	 */
	public function plimit($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 ";
		}
	}


	/**
	 *   Escape a string to insert data
	 *
	 *   @param		string	$stringtoencode		String to escape
	 *   @return	string						String escaped
	 */
	public function escape($stringtoencode)
	{
		return pg_escape_string($stringtoencode);
	}

	/**
	 *	Escape a string to insert data into a like
	 *
	 *	@param	string	$stringtoencode		String to escape
	 *	@return	string						String escaped
	 */
	public function escapeforlike($stringtoencode)
	{
		return str_replace(array('_', '\\', '%'), array('\_', '\\\\', '\%'), (string) $stringtoencode);
	}

	/**
	 *  Format a SQL IF
	 *
	 *  @param	string	$test           Test string (example: 'cd.statut=0', 'field IS NULL')
	 *  @param	string	$resok          resultat si test egal
	 *  @param	string	$resko          resultat si test non egal
	 *  @return	string          		chaine formate SQL
	 */
	public function ifsql($test, $resok, $resko)
	{
		return '(CASE WHEN '.$test.' THEN '.$resok.' ELSE '.$resko.' END)';
	}

	/**
	 *	Format a SQL REGEXP
	 *
	 *	@param	string	$subject        string tested
	 *	@param	string  $pattern        SQL pattern to match
	 *	@param	string	$sqlstring      whether or not the string being tested is an SQL expression
	 *	@return	string          		SQL string
	 */
	public function regexpsql($subject, $pattern, $sqlstring = false)
	{
		if ($sqlstring) {
			return "(". $subject ." ~ '" . $pattern . "')";
		}

		return "('". $subject ."' ~ '" . $pattern . "')";
	}


	/**
	 * Renvoie le code erreur generique de l'operation precedente.
	 *
	 * @return	string		Error code (Exemples: DB_ERROR_TABLE_ALREADY_EXISTS, DB_ERROR_RECORD_ALREADY_EXISTS...)
	 */
	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'
	}

	/**
	 * Renvoie le texte de l'erreur pgsql de l'operation precedente
	 *
	 * @return	string		Error text
	 */
	public function error()
	{
		return pg_last_error($this->db);
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 * Get last ID after an insert INSERT
	 *
	 * @param   string	$tab    	Table name concerned by insert. Ne sert pas sous MySql mais requis pour compatibilite avec Postgresql
	 * @param	string	$fieldid	Field name
	 * @return  string     			Id of row
	 */
	public function last_insert_id($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;
	}

	/**
	 * Encrypt sensitive data in database
	 * Warning: This function includes the escape and add the SQL simple quotes on strings.
	 *
	 * @param	string	$fieldorvalue	Field name or value to encrypt
	 * @param	int		$withQuotes		Return string including the SQL simple quotes. This param must always be 1 (Value 0 is bugged and deprecated).
	 * @return	string					XXX(field) or XXX('value') or field or 'value'
	 */
	public function encrypt($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 ? "'" : "");
	}


	/**
	 *	Decrypt sensitive data in database
	 *
	 *	@param	int		$value			Value to decrypt
	 * 	@return	string					Decrypted value if used
	 */
	public function decrypt($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
	/**
	 * Return connexion ID
	 *
	 * @return	        string      Id connexion
	 */
	public function DDLGetConnectId()
	{
		// phpcs:enable
		return '?';
	}



	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Create a new database
	 *	Do not use function xxx_create_db (xxx=mysql, ...) as they are deprecated
	 *	We force to create database with charset this->forcecharset and collate this->forcecollate
	 *
	 *	@param	string	$database		Database name to create
	 * 	@param	string	$charset		Charset used to store data
	 * 	@param	string	$collation		Charset used to sort data
	 * 	@param	string	$owner			Username of database owner
	 * 	@return	false|resource				resource defined if OK, null if KO
	 */
	public function DDLCreateDb($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
	/**
	 *  List tables into a database
	 *
	 *  @param	string		$database	Name of database
	 *  @param	string		$table		Name of table filter ('xxx%')
	 *  @return	array					List of tables in an array
	 */
	public function DDLListTables($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
	/**
	 *	List information of columns into a table.
	 *
	 *	@param	string	$table		Name of table
	 *	@return	array				Tableau des informations des champs de la table
	 *
	 */
	public function DDLInfoTable($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
	/**
	 *	Create a table into database
	 *
	 *	@param	    string	$table 			Nom de la table
	 *	@param	    array	$fields 		Tableau associatif [nom champ][tableau des descriptions]
	 *	@param	    string	$primary_key 	Nom du champ qui sera la clef primaire
	 *	@param	    string	$type 			Type de la table
	 *	@param	    array	$unique_keys 	Tableau associatifs Nom de champs qui seront clef unique => valeur
	 *	@param	    array	$fulltext_keys	Tableau des Nom de champs qui seront indexes en fulltext
	 *	@param	    array	$keys 			Tableau des champs cles noms => valeur
	 *	@return	    int						<0 if KO, >=0 if OK
	 */
	public function DDLCreateTable($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
	/**
	 *	Drop a table into database
	 *
	 *	@param	    string	$table 			Name of table
	 *	@return	    int						<0 if KO, >=0 if OK
	 */
	public function DDLDropTable($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
	/**
	 * 	Create a user to connect to database
	 *
	 *	@param	string	$dolibarr_main_db_host 		Ip server
	 *	@param	string	$dolibarr_main_db_user 		Name of user to create
	 *	@param	string	$dolibarr_main_db_pass 		Password of user to create
	 *	@param	string	$dolibarr_main_db_name		Database name where user must be granted
	 *	@return	int									<0 if KO, >=0 if OK
	 */
	public function DDLCreateUser($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
	/**
	 *	Return a pointer of line with description of a table or field
	 *
	 *	@param	string		$table	Name of table
	 *	@param	string		$field	Optionnel : Name of field if we want description of field
	 *	@return	false|resource		Resultset x (x->attname)
	 */
	public function DDLDescTable($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
	/**
	 *	Create a new field into table
	 *
	 *	@param	string	$table 				Name of table
	 *	@param	string	$field_name 		Name of field to add
	 *	@param	string	$field_desc 		Tableau associatif de description du champ a inserer[nom du parametre][valeur du parametre]
	 *	@param	string	$field_position 	Optionnel ex.: "after champtruc"
	 *	@return	int							<0 if KO, >0 if OK
	 */
	public function DDLAddField($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('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
	/**
	 *	Update format of a field into a table
	 *
	 *	@param	string	$table 				Name of table
	 *	@param	string	$field_name 		Name of field to modify
	 *	@param	string	$field_desc 		Array with description of field format
	 *	@return	int							<0 if KO, >0 if OK
	 */
	public function DDLUpdateField($table, $field_name, $field_desc)
	{
		// phpcs:enable
		$sql = "ALTER TABLE ".$table;
		$sql .= " MODIFY COLUMN ".$field_name." ".$field_desc['type'];
		if (in_array($field_desc['type'], array('double', 'varchar')) && $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 ".$field_name." = '".$this->escape($field_desc['default'] ? $field_desc['default'] : '')."' WHERE ".$field_name." IS NULL";
				$this->query($sqlbis);
			} elseif ($field_desc['type'] == 'tinyint' || $field_desc['type'] == 'int') {
				$sqlbis = "UPDATE ".$table." SET ".$field_name." = ".((int) $this->escape($field_desc['default'] ? $field_desc['default'] : 0))." WHERE ".$field_name." IS NULL";
				$this->query($sqlbis);
			}
		}

		if ($field_desc['default'] != '') {
			if ($field_desc['type'] == 'double' || $field_desc['type'] == 'tinyint' || $field_desc['type'] == 'int') {
				$sql .= " DEFAULT ".$this->escape($field_desc['default']);
			} elseif ($field_desc['type'] != 'text') {
				$sql .= " DEFAULT '".$this->escape($field_desc['default'])."'"; // Default not supported on text fields
			}
		}

		dol_syslog($sql, LOG_DEBUG);
		if (!$this->query($sql)) {
			return -1;
		}
		return 1;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Drop a field from table
	 *
	 *	@param	string	$table 			Name of table
	 *	@param	string	$field_name 	Name of field to drop
	 *	@return	int						<0 if KO, >0 if OK
	 */
	public function DDLDropField($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;
	}

	/**
	 *	Return charset used to store data in database
	 *
	 *	@return		string		Charset
	 */
	public function getDefaultCharacterSetDatabase()
	{
		$resql = $this->query('SHOW SERVER_ENCODING');
		if ($resql) {
			$liste = $this->fetch_array($resql);
			return $liste['server_encoding'];
		} else {
			return '';
		}
	}

	/**
	 *	Return list of available charset that can be used to store data in database
	 *
	 *	@return		array		List of Charset
	 */
	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;
	}

	/**
	 *	Return collation used in database
	 *
	 *	@return		string		Collation value
	 */
	public function getDefaultCollationDatabase()
	{
		$resql = $this->query('SHOW LC_COLLATE');
		if ($resql) {
			$liste = $this->fetch_array($resql);
			return $liste['lc_collate'];
		} else {
			return '';
		}
	}

	/**
	 *	Return list of available collation that can be used for database
	 *
	 *	@return		array		Liste of Collation
	 */
	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;
	}

	/**
	 *	Return full path of dump program
	 *
	 *	@return		string		Full path of dump program
	 */
	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;
	}

	/**
	 *	Return full path of restore program
	 *
	 *	@return		string		Full path of restore program
	 */
	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;
	}

	/**
	 * Return value of server parameters
	 *
	 * @param	string	$filter		Filter list on a particular value
	 * @return	array				Array of key-values (key=>value)
	 */
	public function getServerParametersValues($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;
	}

	/**
	 * Return value of server status
	 *
	 * @param	string	$filter		Filter list on a particular value
	 * @return  array				Array of key-values (key=>value)
	 */
	public function getServerStatusValues($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();
	}
}