<?php
/* Copyright (C) 2001      Fabien Seisen        <seisen@linuxfr.org>
 * Copyright (C) 2002-2005 Rodolphe Quiedeville <rodolphe@quiedeville.org>
 * Copyright (C) 2004-2011 Laurent Destailleur  <eldy@users.sourceforge.net>
 * Copyright (C) 2006      Andre Cianfarani     <acianfa@free.fr>
 * Copyright (C) 2005-2009 Regis Houssin        <regis.houssin@inodbox.com>
 * Copyright (C) 2015      Raphaël Doursenaud   <rdoursenaud@gpcsolutions.fr>
 *
 * 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/sqlite3.class.php
 *	\brief      Class file to manage Dolibarr database access for a SQLite database
 */

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

/**
 *	Class to manage Dolibarr database access for a SQLite database
 */
class DoliDBSqlite3 extends DoliDB
{
	//! Database type
	public $type = 'sqlite3';
	//! Database label
	const LABEL = 'Sqlite3';
	//! Version min database
	const VERSIONMIN = '3.0.0';

	/**
	 * @var SQLite3Result|boolean 	Resultset of last query
	 */
	private $_results;

	const WEEK_MONDAY_FIRST = 1;
	const WEEK_YEAR = 2;
	const WEEK_FIRST_WEEKDAY = 4;


	/**
	 *  Constructor.
	 *  This create an opened connexion to a database server and eventually to a database
	 *
	 *  @param      string	$type		Type of database (mysql, pgsql...). Not used.
	 *  @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;

		// 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("sqlite_query"))
		{
			$this->connected = false;
			$this->ok = false;
			$this->error="Sqlite PHP functions for using Sqlite driver are not available in this version of PHP. Try to use another driver.";
			dol_syslog(get_class($this)."::DoliDBSqlite3 : Sqlite PHP functions for using Sqlite driver are not available in this version of PHP. Try to use another driver.",LOG_ERR);
			return;
		}*/

		/*if (! $host)
		{
			$this->connected = false;
			$this->ok = false;
			$this->error=$langs->trans("ErrorWrongHostParameter");
			dol_syslog(get_class($this)."::DoliDBSqlite3 : Erreur Connect, wrong host parameters",LOG_ERR);
			return;
		}*/

		// Essai connexion serveur
		// We do not try to connect to database, only to server. Connect to database is done later in constrcutor
		$this->db = $this->connect($host, $user, $pass, $name, $port);

		if ($this->db) {
			$this->connected = true;
			$this->ok = true;
			$this->database_selected = true;
			$this->database_name = $name;

			$this->addCustomFunction('IF');
			$this->addCustomFunction('MONTH');
			$this->addCustomFunction('CURTIME');
			$this->addCustomFunction('CURDATE');
			$this->addCustomFunction('WEEK', 1);
			$this->addCustomFunction('WEEK', 2);
			$this->addCustomFunction('WEEKDAY');
			$this->addCustomFunction('date_format');
			//$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
		} else {
			// host, login ou password incorrect
			$this->connected = false;
			$this->ok = false;
			$this->database_selected = false;
			$this->database_name = '';
			//$this->error=sqlite_connect_error();
			dol_syslog(get_class($this)."::DoliDBSqlite3 : Error Connect ".$this->error, LOG_ERR);
		}
	}


	/**
	 *  Convert a SQL request in Mysql syntax to native syntax
	 *
	 *  @param     string	$line   SQL request line to convert
	 *  @param     string	$type	Type of SQL order ('ddl' for insert, update, select, delete or 'dml' for create, alter...)
	 *  @return    string   		SQL request line converted
	 */
	public function convertSQLFromMysql($line, $type = 'ddl')
	{
		// 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 != "") {
			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';
				}
			}

			if ($type == 'dml') {
				$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 integer PRIMARY KEY AUTOINCREMENT', $line);
					//$line = "-- ".$line." replaced by --\n".$newline;
					$line = $newline;
				}

				// tinyint type conversion
				$line = str_replace('tinyint', 'smallint', $line);

				// nuke unsigned
				$line = preg_replace('/(int\w+|smallint)\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);

				// 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);

				// 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('/AFTER [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_]+ DROP INDEX/i', 'DROP INDEX', $line);

				// Translate order to rename fields
				if (preg_match('/ALTER TABLE ([a-z0-9_]+) 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_]+) 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 create a unique index instead as dynamic creation of primary key is not supported
				// 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";
					$line .= "CREATE UNIQUE INDEX ".$reg[2]." ON ".$reg[1]."(".$reg[3];
				}

				// 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];
				}

				// 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.")";
				}
				if (preg_match('/ALTER\s+TABLE\s*(.*)\s*ADD\s+CONSTRAINT\s+(.*)\s*FOREIGN\s+KEY\s*\(([\w,\s]+)\)\s*REFERENCES\s+(\w+)\s*\(([\w,\s]+)\)/i', $line, $reg)) {
					// Pour l'instant les contraintes ne sont pas créées
					dol_syslog(get_class().'::query line emptied');
					$line = 'SELECT 0;';
				}

				//if (preg_match('/rowid\s+.*\s+PRIMARY\s+KEY,/i', $line)) {
					//preg_replace('/(rowid\s+.*\s+PRIMARY\s+KEY\s*,)/i', '/* \\1 */', $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 one 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 two 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 two 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";

			//print "type=".$type." newline=".$line."<br>\n";
		}

		return $line;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Select a database
	 *
	 *	@param	    string	$database	Name of database
	 *	@return	    boolean  		    true if OK, false if KO
	 */
	public function select_db($database)
	{
		// phpcs:enable
		dol_syslog(get_class($this)."::select_db database=".$database, LOG_DEBUG);
		// sqlite_select_db() does not exist
		//return sqlite_select_db($this->db,$database);
		return true;
	}


	/**
	 *	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	$port		Port of database server
	 *	@return		SQLite3|string				Database access handler
	 *	@see		close()
	 */
	public function connect($host, $login, $passwd, $name, $port = 0)
	{
		global $main_data_dir;

		dol_syslog(get_class($this)."::connect name=".$name, LOG_DEBUG);

		$dir = $main_data_dir;
		if (empty($dir)) {
			$dir = DOL_DATA_ROOT;
		}
		// With sqlite, port must be in connect parameters
		//if (! $newport) $newport=3306;
		$database_name = $dir.'/database_'.$name.'.sdb';
		try {
			/*** connect to SQLite database ***/
			//$this->db = new PDO("sqlite:".$dir.'/database_'.$name.'.sdb');
			$this->db = new SQLite3($database_name);
			//$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
		} catch (Exception $e) {
			$this->error = self::LABEL.' '.$e->getMessage().' current dir='.$database_name;
			return '';
		}

		//print "Resultat fonction connect: ".$this->db;
		return $this->db;
	}


	/**
	 *	Return version of database server
	 *
	 *	@return	        string      Version string
	 */
	public function getVersion()
	{
		$tmp = $this->db->version();
		return $tmp['versionString'];
	}

	/**
	 *	Return version of database client driver
	 *
	 *	@return	        string      Version string
	 */
	public function getDriverInfo()
	{
		return 'sqlite3 php driver';
	}


	/**
	 *  Close database connexion
	 *
	 *  @return     bool     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;
			$this->db->close();
			unset($this->db); // Clean this->db
			return true;
		}
		return false;
	}

	/**
	 *  Execute a SQL request and return the resultset
	 *
	 * 	@param	string	$query			SQL query string
	 * 	@param	int		$usesavepoint	0=Default mode, 1=Run a savepoint before and a rollbock to savepoint if error (this allow to have some request with errors inside global transactions).
	 * 									Note that with Mysql, this parameter is not used as Myssql can already commit a transaction even if one request is in error, without using savepoints.
	 *  @param  string	$type           Type of SQL order ('ddl' for insert, update, select, delete or 'dml' for create, alter...)
	 * @param	int		$result_mode	Result mode (not used with sqlite)
	 *	@return	bool|SQLite3Result		Resultset of answer
	 */
	public function query($query, $usesavepoint = 0, $type = 'auto', $result_mode = 0)
	{
		global $conf, $dolibarr_main_db_readonly;

		$ret = null;

		$query = trim($query);

		$this->error = '';

		// Convert MySQL syntax to SQLite syntax
		$reg = array();
		if (preg_match('/ALTER\s+TABLE\s*(.*)\s*ADD\s+CONSTRAINT\s+(.*)\s*FOREIGN\s+KEY\s*\(([\w,\s]+)\)\s*REFERENCES\s+(\w+)\s*\(([\w,\s]+)\)/i', $query, $reg)) {
			// Ajout d'une clef étrangère à la table
			// procédure de remplacement de la table pour ajouter la contrainte
			// Exemple : ALTER TABLE llx_adherent ADD CONSTRAINT adherent_fk_soc FOREIGN KEY (fk_soc) REFERENCES llx_societe (rowid)
			// -> CREATE TABLE ( ... ,CONSTRAINT adherent_fk_soc FOREIGN KEY (fk_soc) REFERENCES llx_societe (rowid))
			$foreignFields = $reg[5];
			$foreignTable = $reg[4];
			$localfields = $reg[3];
			$constraintname = trim($reg[2]);
			$tablename = trim($reg[1]);

			$descTable = $this->db->querySingle("SELECT sql FROM sqlite_master WHERE name='".$this->escape($tablename)."'");

			// 1- Renommer la table avec un nom temporaire
			$this->query("ALTER TABLE ".$tablename." RENAME TO tmp_".$tablename);

			// 2- Recréer la table avec la contrainte ajoutée

			// on bricole la requete pour ajouter la contrainte
			$descTable = substr($descTable, 0, strlen($descTable) - 1);
			$descTable .= ", CONSTRAINT ".$constraintname." FOREIGN KEY (".$localfields.") REFERENCES ".$foreignTable."(".$foreignFields.")";

			// fermeture de l'instruction
			$descTable .= ')';

			// Création proprement dite de la table
			$this->query($descTable);

			// 3- Transférer les données
			$this->query("INSERT INTO ".$tablename." SELECT * FROM tmp_".$tablename);

			// 4- Supprimer la table temporaire
			$this->query("DROP TABLE tmp_".$tablename);

			// dummy statement
			$query = "SELECT 0";
		} else {
			$query = $this->convertSQLFromMysql($query, $type);
		}
		//print "After convertSQLFromMysql:\n".$query."<br>\n";

		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;
			}
		}

		// Ordre SQL ne necessitant pas de connexion a une base (exemple: CREATE DATABASE)
		try {
			//$ret = $this->db->exec($query);
			$ret = $this->db->query($query); // $ret is a Sqlite3Result
			if ($ret) {
				$ret->queryString = $query;
			}
		} catch (Exception $e) {
			$this->error = $this->db->lastErrorMsg();
		}

		if (!preg_match("/^COMMIT/i", $query) && !preg_match("/^ROLLBACK/i", $query)) {
			// Si requete utilisateur, on la sauvegarde ainsi que son resultset
			if (!is_object($ret) || $this->error) {
				$this->lastqueryerror = $query;
				$this->lasterror = $this->error();
				$this->lasterrno = $this->errno();

				dol_syslog(get_class($this)."::query SQL Error query: ".$query, LOG_ERR);

				$errormsg = get_class($this)."::query SQL Error message: ".$this->lasterror;

				if (preg_match('/[0-9]/', $this->lasterrno)) {
					$errormsg .= ' ('.$this->lasterrno.')';
				}

				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: ".$errormsg, LOG_ERR);
			}
			$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	SQLite3Result	$resultset  Curseur de la requete voulue
	 *	@return	false|object				Object result line or false if KO or end of cursor
	 */
	public function fetch_object($resultset)
	{
		// phpcs:enable
		// Si le resultset n'est pas fourni, on prend le dernier utilise sur cette connexion
		if (!is_object($resultset)) {
			$resultset = $this->_results;
		}
		//return $resultset->fetch(PDO::FETCH_OBJ);
		$ret = $resultset->fetchArray(SQLITE3_ASSOC);
		if ($ret) {
			return (object) $ret;
		}
		return false;
	}


	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Return datas as an array
	 *
	 *	@param	SQLite3Result	$resultset  Resultset of request
	 *	@return	false|array					Array or false if KO or end of cursor
	 */
	public function fetch_array($resultset)
	{
		// phpcs:enable
		// If resultset not provided, we take the last used by connexion
		if (!is_object($resultset)) {
			$resultset = $this->_results;
		}
		//return $resultset->fetch(PDO::FETCH_ASSOC);
		$ret = $resultset->fetchArray(SQLITE3_ASSOC);
		return $ret;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Return datas as an array
	 *
	 *	@param	SQLite3Result	$resultset  Resultset of request
	 *	@return	false|array					Array or false if KO or end of cursor
	 */
	public function fetch_row($resultset)
	{
		// phpcs:enable
		// If resultset not provided, we take the last used by connexion
		if (!is_bool($resultset)) {
			if (!is_object($resultset)) {
				$resultset = $this->_results;
			}
			return $resultset->fetchArray(SQLITE3_NUM);
		} else {
			// si le curseur est un booleen on retourne la valeur 0
			return false;
		}
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Return number of lines for result of a SELECT
	 *
	 *	@param	SQLite3Result	$resultset  Resulset of requests
	 *	@return int		    			Nb of lines
	 *	@see    affected_rows()
	 */
	public function num_rows($resultset)
	{
		// phpcs:enable
		// FIXME: SQLite3Result does not have a queryString member

		// If resultset not provided, we take the last used by connexion
		if (!is_object($resultset)) {
			$resultset = $this->_results;
		}
		if (preg_match("/^SELECT/i", $resultset->queryString)) {
			return $this->db->querySingle("SELECT count(*) FROM (".$resultset->queryString.") q");
		}
		return 0;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Return number of lines for result of a SELECT
	 *
	 *	@param	SQLite3Result	$resultset  Resulset of requests
	 *	@return int		    			Nb of lines
	 *	@see    affected_rows()
	 */
	public function affected_rows($resultset)
	{
		// phpcs:enable
		// FIXME: SQLite3Result does not have a queryString member

		// If resultset not provided, we take the last used by connexion
		if (!is_object($resultset)) {
			$resultset = $this->_results;
		}
		if (preg_match("/^SELECT/i", $resultset->queryString)) {
			return $this->num_rows($resultset);
		}
		// mysql necessite un link de base pour cette fonction contrairement
		// a pqsql qui prend un resultset
		return $this->db->changes();
	}


	/**
	 *	Free last resultset used.
	 *
	 *	@param  SQLite3Result	$resultset   Curseur de la requete voulue
	 *	@return	void
	 */
	public function free($resultset = null)
	{
		// If resultset not provided, we take the last used by connexion
		if (!is_object($resultset)) {
			$resultset = $this->_results;
		}
		// Si resultset en est un, on libere la memoire
		if ($resultset && is_object($resultset)) {
			$resultset->finalize();
		}
	}

	/**
	 *	Escape a string to insert data
	 *
	 *  @param	string	$stringtoencode		String to escape
	 *  @return	string						String escaped
	 */
	public function escape($stringtoencode)
	{
		return Sqlite3::escapeString($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);
	}

	/**
	 *	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',
			'HY000' => 'DB_ERROR_TABLE_ALREADY_EXISTS',
			1051 => 'DB_ERROR_NOSUCHTABLE',
			1054 => 'DB_ERROR_NOSUCHFIELD',
			1060 => 'DB_ERROR_COLUMN_ALREADY_EXISTS',
			1061 => 'DB_ERROR_KEY_NAME_ALREADY_EXISTS',
			1062 => 'DB_ERROR_RECORD_ALREADY_EXISTS',
			1064 => 'DB_ERROR_SYNTAX',
			1068 => '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',
			1146 => 'DB_ERROR_NOSUCHTABLE',
			1216 => 'DB_ERROR_NO_PARENT',
			1217 => 'DB_ERROR_CHILD_EXISTS',
			1451 => 'DB_ERROR_CHILD_EXISTS'
			);

			if (isset($errorcode_map[$this->db->errorCode()]))
			{
				return $errorcode_map[$this->db->errorCode()];
			}*/
			$errno = $this->db->lastErrorCode();
			if ($errno == 'HY000' || $errno == 0) {
				if (preg_match('/table.*already exists/i', $this->error)) {
					return 'DB_ERROR_TABLE_ALREADY_EXISTS';
				} elseif (preg_match('/index.*already exists/i', $this->error)) {
					return 'DB_ERROR_KEY_NAME_ALREADY_EXISTS';
				} elseif (preg_match('/syntax error/i', $this->error)) {
					return 'DB_ERROR_SYNTAX';
				}
			}
			if ($errno == '23000') {
				if (preg_match('/column.* not unique/i', $this->error)) {
					return 'DB_ERROR_RECORD_ALREADY_EXISTS';
				} elseif (preg_match('/PRIMARY KEY must be unique/i', $this->error)) {
					return 'DB_ERROR_RECORD_ALREADY_EXISTS';
				}
			}
			if ($errno > 1) {
				// TODO Voir la liste des messages d'erreur
			}

			return ($errno ? 'DB_ERROR_'.$errno : '0');
		}
	}

	/**
	 *	Renvoie le texte de l'erreur mysql de l'operation precedente.
	 *
	 *	@return	string	Error text
	 */
	public function error()
	{
		if (!$this->connected) {
			// Si il y a eu echec de connexion, $this->db n'est pas valide pour sqlite_error.
			return 'Not connected. Check setup parameters in conf/conf.php file and your sqlite version';
		} else {
			return $this->error;
		}
	}

	// 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	$fieldid	Field name
	 * @return  int     			Id of row
	 */
	public function last_insert_id($tab, $fieldid = 'rowid')
	{
		// phpcs:enable
		return $this->db->lastInsertRowId();
	}

	/**
	 * 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)
		$cryptType = (!empty($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 : '');

		$escapedstringwithquotes = ($withQuotes ? "'" : "").$this->escape($fieldorvalue).($withQuotes ? "'" : "");

		if ($cryptType && !empty($cryptKey)) {
			if ($cryptType == 2) {
				$escapedstringwithquotes = "AES_ENCRYPT(".$escapedstringwithquotes.", '".$this->escape($cryptKey)."')";
			} elseif ($cryptType == 1) {
				$escapedstringwithquotes = "DES_ENCRYPT(".$escapedstringwithquotes.", '".$this->escape($cryptKey)."')";
			}
		}

		return $escapedstringwithquotes;
	}

	/**
	 *	Decrypt sensitive data in database
	 *
	 *	@param	string	$value			Value to decrypt
	 * 	@return	string					Decrypted value if used
	 */
	public function decrypt($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;

		if ($cryptType && !empty($cryptKey)) {
			if ($cryptType == 2) {
				$return = 'AES_DECRYPT('.$value.',\''.$cryptKey.'\')';
			} elseif ($cryptType == 1) {
				$return = 'DES_DECRYPT('.$value.',\''.$cryptKey.'\')';
			}
		}

		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	$owner			Username of database owner
	 * 	@return	SQLite3Result   		resource defined if OK, null if KO
	 */
	public function DDLCreateDb($database, $charset = '', $collation = '', $owner = '')
	{
		// phpcs:enable
		if (empty($charset)) {
			$charset = $this->forcecharset;
		}
		if (empty($collation)) {
			$collation = $this->forcecollate;
		}

		// ALTER DATABASE dolibarr_db DEFAULT CHARACTER SET latin DEFAULT COLLATE latin1_swedish_ci
		$sql = "CREATE DATABASE ".$this->escape($database);
		$sql .= " DEFAULT CHARACTER SET ".$this->escape($charset)." DEFAULT COLLATE ".$this->escape($collation);

		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();

		$like = '';
		if ($table) {
			$tmptable = preg_replace('/[^a-z0-9\.\-\_%]/i', '', $table);

			$like = "LIKE '".$this->escape($tmptable)."'";
		}
		$tmpdatabase = preg_replace('/[^a-z0-9\.\-\_]/i', '', $database);

		$sql = "SHOW TABLES FROM ".$tmpdatabase." ".$like.";";
		//print $sql;
		$result = $this->query($sql);
		if ($result) {
			while ($row = $this->fetch_row($result)) {
				$listtables[] = $row[0];
			}
		}
		return $listtables;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *  List tables into a database with table type
	 *
	 *  @param	string		$database	Name of database
	 *  @param	string		$table		Name of table filter ('xxx%')
	 *  @return	array					List of tables in an array
	 */
	public function DDLListTablesFull($database, $table = '')
	{
		// phpcs:enable
		$listtables = array();

		$like = '';
		if ($table) {
			$tmptable = preg_replace('/[^a-z0-9\.\-\_%]/i', '', $table);

			$like = "LIKE '".$this->escape($tmptable)."'";
		}
		$tmpdatabase = preg_replace('/[^a-z0-9\.\-\_]/i', '', $database);

		$sql = "SHOW FULL TABLES FROM ".$tmpdatabase." ".$like.";";
		//print $sql;
		$result = $this->query($sql);
		if ($result) {
			while ($row = $this->fetch_row($result)) {
				$listtables[] = $row;
			}
		}
		return $listtables;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *  List information of columns into a table.
	 *
	 *	@param	string	$table		Name of table
	 *	@return	array				Tableau des informations des champs de la table
	 *	TODO modify for sqlite
	 */
	public function DDLInfoTable($table)
	{
		// phpcs:enable
		$infotables = array();

		$tmptable = preg_replace('/[^a-z0-9\.\-\_]/i', '', $table);

		$sql = "SHOW FULL COLUMNS FROM ".$tmptable.";";

		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	$keys 			Tableau des champs cles noms => valeur
	 *	@return	    int						Return integer <0 if KO, >=0 if OK
	 */
	public function DDLCreateTable($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;
		}
		return 1;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 *	Drop a table into database
	 *
	 *	@param	    string	$table 			Name of table
	 *	@return	    int						Return integer <0 if KO, >=0 if OK
	 */
	public function DDLDropTable($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
	/**
	 *	Return a pointer of line with description of a table or field
	 *
	 *	@param	string		$table	Name of table
	 *	@param	string		$field	Optionnel : Name of field if we want description of field
	 *	@return	bool|SQLite3Result		Resource
	 */
	public function DDLDescTable($table, $field = "")
	{
		// phpcs:enable
		$sql = "DESC ".$table." ".$field;

		dol_syslog(get_class($this)."::DDLDescTable ".$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	$field_position 	Optionnel ex.: "after champtruc"
	 *	@return	int							Return integer <0 if KO, >0 if OK
	 */
	public function DDLAddField($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('date', 'datetime'))) {
				$sql .= "(".$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(get_class($this)."::DDLAddField ".$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	$field_desc 		Array with description of field format
	 *	@return	int							Return integer <0 if KO, >0 if OK
	 */
	public function DDLUpdateField($table, $field_name, $field_desc)
	{
		// phpcs:enable
		$sql = "ALTER TABLE ".$table;
		$sql .= " MODIFY COLUMN ".$field_name." ".$field_desc['type'];
		if ($field_desc['type'] == 'tinyint' || $field_desc['type'] == 'int' || $field_desc['type'] == 'varchar') {
			$sql .= "(".$field_desc['value'].")";
		}

		dol_syslog(get_class($this)."::DDLUpdateField ".$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	$field_name 	Name of field to drop
	 *	@return	int						Return integer <0 if KO, >0 if OK
	 */
	public function DDLDropField($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;
	}


	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 * 	Create a user and privileges to connect to database (even if database does not exists yet)
	 *
	 *	@param	string	$dolibarr_main_db_host 		Ip serveur
	 *	@param	string	$dolibarr_main_db_user 		Nom user a creer
	 *	@param	string	$dolibarr_main_db_pass 		Mot de passe user a creer
	 *	@param	string	$dolibarr_main_db_name		Database name where user must be granted
	 *	@return	int									Return integer <0 if KO, >=0 if OK
	 */
	public function DDLCreateUser($dolibarr_main_db_host, $dolibarr_main_db_user, $dolibarr_main_db_pass, $dolibarr_main_db_name)
	{
		// phpcs:enable
		$sql = "INSERT INTO user ";
		$sql .= "(Host,User,password,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv,Index_Priv,Alter_priv,Lock_tables_priv)";
		$sql .= " VALUES ('".$this->escape($dolibarr_main_db_host)."','".$this->escape($dolibarr_main_db_user)."',password('".addslashes($dolibarr_main_db_pass)."')";
		$sql .= ",'Y','Y','Y','Y','Y','Y','Y','Y','Y')";

		dol_syslog(get_class($this)."::DDLCreateUser", LOG_DEBUG); // No sql to avoid password in log
		$resql = $this->query($sql);
		if (!$resql) {
			return -1;
		}

		$sql = "INSERT INTO db ";
		$sql .= "(Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv,Index_Priv,Alter_priv,Lock_tables_priv)";
		$sql .= " VALUES ('".$this->escape($dolibarr_main_db_host)."','".$this->escape($dolibarr_main_db_name)."','".addslashes($dolibarr_main_db_user)."'";
		$sql .= ",'Y','Y','Y','Y','Y','Y','Y','Y','Y')";

		dol_syslog(get_class($this)."::DDLCreateUser", LOG_DEBUG);
		$resql = $this->query($sql);
		if (!$resql) {
			return -1;
		}

		$sql = "FLUSH Privileges";

		dol_syslog(get_class($this)."::DDLCreateUser", LOG_DEBUG);
		$resql = $this->query($sql);
		if (!$resql) {
			return -1;
		}
		return 1;
	}

	/**
	 *	Return charset used to store data in database
	 *
	 *	@return		string		Charset
	 */
	public function getDefaultCharacterSetDatabase()
	{
		return 'UTF-8';
	}

	/**
	 *	Return list of available charset that can be used to store data in database
	 *
	 *	@return		array		List of Charset
	 */
	public function getListOfCharacterSet()
	{
		$liste = array();
		$i = 0;
		$liste[$i]['charset'] = 'UTF-8';
		$liste[$i]['description'] = 'UTF-8';
		return $liste;
	}

	/**
	 *	Return collation used in database
	 *
	 *	@return		string		Collation value
	 */
	public function getDefaultCollationDatabase()
	{
		return 'UTF-8';
	}

	/**
	 *	Return list of available collation that can be used for database
	 *
	 *	@return		array		List of Collation
	 */
	public function getListOfCollation()
	{
		$liste = array();
		$i = 0;
		$liste[$i]['charset'] = 'UTF-8';
		$liste[$i]['description'] = 'UTF-8';
		return $liste;
	}

	/**
	 *	Return full path of dump program
	 *
	 *	@return		string		Full path of dump program
	 */
	public function getPathOfDump()
	{
		// FIXME: not for SQLite
		$fullpathofdump = '/pathtomysqldump/mysqldump';

		$resql = $this->query('SHOW VARIABLES LIKE \'basedir\'');
		if ($resql) {
			$liste = $this->fetch_array($resql);
			$basedir = $liste['Value'];
			$fullpathofdump = $basedir.(preg_match('/\/$/', $basedir) ? '' : '/').'bin/mysqldump';
		}
		return $fullpathofdump;
	}

	/**
	 *	Return full path of restore program
	 *
	 *	@return		string		Full path of restore program
	 */
	public function getPathOfRestore()
	{
		// FIXME: not for SQLite
		$fullpathofimport = '/pathtomysql/mysql';

		$resql = $this->query('SHOW VARIABLES LIKE \'basedir\'');
		if ($resql) {
			$liste = $this->fetch_array($resql);
			$basedir = $liste['Value'];
			$fullpathofimport = $basedir.(preg_match('/\/$/', $basedir) ? '' : '/').'bin/mysql';
		}
		return $fullpathofimport;
	}

	/**
	 * 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();
		static $pragmas;
		if (!isset($pragmas)) {
			// Définition de la liste des pragmas utilisés qui ne retournent qu'une seule valeur
			// indépendante de la base de données.
			// cf. http://www.sqlite.org/pragma.html
			$pragmas = array(
				'application_id', 'auto_vacuum', 'automatic_index', 'busy_timeout', 'cache_size',
				'cache_spill', 'case_sensitive_like', 'checkpoint_fullsync', 'collation_list',
				'compile_options', 'data_version', /*'database_list',*/
				'defer_foreign_keys', 'encoding', 'foreign_key_check', 'freelist_count',
				'full_column_names', 'fullsync', 'ingore_check_constraints', 'integrity_check',
				'journal_mode', 'journal_size_limit', 'legacy_file_format', 'locking_mode',
				'max_page_count', 'page_count', 'page_size', 'parser_trace',
				'query_only', 'quick_check', 'read_uncommitted', 'recursive_triggers',
				'reverse_unordered_selects', 'schema_version', 'user_version',
				'secure_delete', 'short_column_names', 'shrink_memory', 'soft_heap_limit',
				'synchronous', 'temp_store', /*'temp_store_directory',*/ 'threads',
				'vdbe_addoptrace', 'vdbe_debug', 'vdbe_listing', 'vdbe_trace',
				'wal_autocheckpoint',
			);
		}

		// TODO prendre en compte le filtre
		foreach ($pragmas as $var) {
			$sql = "PRAGMA $var";
			$resql = $this->query($sql);
			if ($resql) {
				$obj = $this->fetch_row($resql);
				//dol_syslog(get_class($this)."::select_db getServerParametersValues $var=". print_r($obj, true), LOG_DEBUG);
				$result[$var] = $obj[0];
			} else {
				// TODO Récupérer le message
				$result[$var] = 'FAIL';
			}
		}
		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 = '')
	{
		$result = array();
		/*
		$sql='SHOW STATUS';
		if ($filter) $sql.=" LIKE '".$this->escape($filter)."'";
		$resql=$this->query($sql);
		if ($resql)
		{
			while ($obj=$this->fetch_object($resql)) $result[$obj->Variable_name]=$obj->Value;
		}
		 */

		return $result;
	}

	/**
	 * Permet le chargement d'une fonction personnalisee dans le moteur de base de donnees.
	 * Note: le nom de la fonction personnalisee est prefixee par 'db'. La fonction doit être
	 * statique et publique. Le nombre de parametres est determine automatiquement.
	 *
	 * @param 	string 	$name 			Le nom de la fonction a definir dans Sqlite
	 * @param	int		$arg_count		Arg count
	 * @return	void
	 */
	private function addCustomFunction($name, $arg_count = -1)
	{
		if ($this->db) {
			$newname = preg_replace('/_/', '', $name);
			$localname = __CLASS__.'::db'.$newname;
			$reflectClass = new ReflectionClass(__CLASS__);
			$reflectFunction = $reflectClass->getMethod('db'.$newname);
			if ($arg_count < 0) {
				$arg_count = $reflectFunction->getNumberOfParameters();
			}
			if (!$this->db->createFunction($name, $localname, $arg_count)) {
				$this->error = "unable to create custom function '$name'";
			}
		}
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 * calc_daynr
	 *
	 * @param 	int 	$year		Year
	 * @param 	int 	$month		Month
	 * @param	int     $day 		Day
	 * @return int Formatted date
	 */
	private static function calc_daynr($year, $month, $day)
	{
		// phpcs:enable
		$y = $year;
		if ($y == 0 && $month == 0) {
			return 0;
		}
		$num = (365 * $y + 31 * ($month - 1) + $day);
		if ($month <= 2) {
			$y--;
		} else {
			$num -= floor(($month * 4 + 23) / 10);
		}
		$temp = floor(($y / 100 + 1) * 3 / 4);
		return $num + floor($y / 4) - $temp;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 * calc_weekday
	 *
	 * @param int	$daynr							???
	 * @param bool	$sunday_first_day_of_week		???
	 * @return int
	 */
	private static function calc_weekday($daynr, $sunday_first_day_of_week)
	{
		// phpcs:enable
		$ret = floor(($daynr + 5 + ($sunday_first_day_of_week ? 1 : 0)) % 7);
		return $ret;
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 * calc_days_in_year
	 *
	 * @param 	string	$year		Year
	 * @return	int					Nb of days in year
	 */
	private static function calc_days_in_year($year)
	{
		// phpcs:enable
		return (($year & 3) == 0 && ($year % 100 || ($year % 400 == 0 && $year)) ? 366 : 365);
	}

	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
	/**
	 * calc_week
	 *
	 * @param 	string	$year				Year
	 * @param 	string	$month				Month
	 * @param 	string	$day				Day
	 * @param 	string	$week_behaviour		Week behaviour
	 * @param 	string	$calc_year			???
	 * @return	string						???
	 */
	private static function calc_week($year, $month, $day, $week_behaviour, &$calc_year)
	{
		// phpcs:enable
		$daynr = self::calc_daynr($year, $month, $day);
		$first_daynr = self::calc_daynr($year, 1, 1);
		$monday_first = ($week_behaviour & self::WEEK_MONDAY_FIRST) ? 1 : 0;
		$week_year = ($week_behaviour & self::WEEK_YEAR) ? 1 : 0;
		$first_weekday = ($week_behaviour & self::WEEK_FIRST_WEEKDAY) ? 1 : 0;

		$weekday = self::calc_weekday($first_daynr, !$monday_first);
		$calc_year = $year;

		if ($month == 1 && $day <= 7 - $weekday) {
			if (!$week_year && (($first_weekday && $weekday != 0) || (!$first_weekday && $weekday >= 4))) {
				return 0;
			}
			$week_year = 1;
			$calc_year--;
			$first_daynr -= ($days = self::calc_days_in_year($calc_year));
			$weekday = ($weekday + 53 * 7 - $days) % 7;
		}

		if (($first_weekday && $weekday != 0) || (!$first_weekday && $weekday >= 4)) {
			$days = $daynr - ($first_daynr + (7 - $weekday));
		} else {
			$days = $daynr - ($first_daynr - $weekday);
		}

		if ($week_year && $days >= 52 * 7) {
			$weekday = ($weekday + self::calc_days_in_year($calc_year)) % 7;
			if ((!$first_weekday && $weekday < 4) || ($first_weekday && $weekday == 0)) {
				$calc_year++;
				return 1;
			}
		}
		return floor($days / 7 + 1);
	}
}
