<?php
/* Copyright (C) 2001		Fabien Seisen			<seisen@linuxfr.org>
 * Copyright (C) 2002-2007	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) 2005-2012	Regis Houssin			<regis.houssin@capnetworks.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 <http://www.gnu.org/licenses/>.
 */

/**
 *	\file       	htdocs/core/db/mysql.class.php
 *	\brief      	Class file to manage Dolibarr database access for a MySQL database
 */

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

/**
 *	Class to manage Dolibarr database access for a MySQL database using the mysql extension
 *
 * @deprecated Use DoliDBMysqli
 */
class DoliDBMysql extends DoliDB
{
	//! Database type
	public $type='mysql';
	//! Database label
	const LABEL='MySQL';
	//! Version min database
	const VERSIONMIN='4.1.0';
	/** @var resource Resultset of last query */
	private $_results;

	/**
	 *	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		$port		Port of database server
	 */
	function __construct($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("mysql_connect"))
		{
			$this->connected = false;
			$this->ok = false;
			$this->error="Mysql PHP functions for using MySql driver are not available in this version of PHP. Try to use another driver.";
			dol_syslog(get_class($this)."::DoliDBMysql : Mysql PHP functions for using Mysql driver are not available in this version of PHP. Try to use another driver.",LOG_ERR);
			return $this->ok;
		}

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

		// Essai connexion serveur
		$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;
			$this->error=mysql_error();
			dol_syslog(get_class($this)."::DoliDBMysql : Erreur Connect mysql_error=".$this->error,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;

				// If client connected with different charset than Dolibarr HTML output
				$clientmustbe='';
				if (preg_match('/UTF-8/i',$conf->file->character_set_client))      $clientmustbe='utf8';
				if (preg_match('/ISO-8859-1/i',$conf->file->character_set_client)) $clientmustbe='latin1';
				if (mysql_client_encoding($this->db) != $clientmustbe)
				{
					$this->query("SET NAMES '".$clientmustbe."'", $this->db);
					//$this->query("SET CHARACTER SET ". $this->forcecharset);
				}
			}
			else
			{
				$this->database_selected = false;
				$this->database_name = '';
				$this->ok = false;
				$this->error=$this->error();
				dol_syslog(get_class($this)."::DoliDBMysql : Erreur Select_db ".$this->error,LOG_ERR);
			}
		}
		else
		{
			// Pas de selection de base demandee, ok ou ko
			$this->database_selected = false;

			if ($this->connected)
			{
				// If client connected with different charset than Dolibarr HTML output
				$clientmustbe='';
				if (preg_match('/UTF-8/i',$conf->file->character_set_client))      $clientmustbe='utf8';
				if (preg_match('/ISO-8859-1/i',$conf->file->character_set_client)) $clientmustbe='latin1';
				if (mysql_client_encoding($this->db) != $clientmustbe)
				{
					$this->query("SET NAMES '".$clientmustbe."'", $this->db);
					//$this->query("SET CHARACTER SET ". $this->forcecharset);
				}
			}
		}

		return $this->ok;
	}


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

	/**
	 *	Select a database
	 *
	 *	@param	    string	$database	Name of database
	 *	@return	    boolean  		    true if OK, false if KO
	 */
	function select_db($database)
	{
		dol_syslog(get_class($this)."::select_db database=".$database, LOG_DEBUG);
		return mysql_select_db($database, $this->db);
	}

	/**
	 *	Connection 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	$port		Port of database server
	 *	@return		resource|false		Database access handler
	 *	@see		close
	 */
	function connect($host, $login, $passwd, $name, $port=0)
	{
		dol_syslog(get_class($this)."::connect host=$host, port=$port, login=$login, passwd=--hidden--, name=$name",LOG_DEBUG);

		$newhost=$host;

		// With mysql, port must be in hostname
		if ($port) $newhost.=':'.$port;

		$this->db  = @mysql_connect($newhost, $login, $passwd);

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

	/**
	 *	Return version of database server
	 *
	 *	@return	        string      Version string
	 */
	function getVersion()
	{
		return mysql_get_server_info($this->db);
	}

	/**
	 *	Return version of database client driver
	 *
	 *	@return	        string      Version string
	 */
	function getDriverInfo()
	{
		return mysql_get_client_info();
	}


    /**
     *  Close database connexion
     *
     *  @return     boolean     True if disconnect successfull, false otherwise
     *  @see        connect
     */
    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);
          $this->connected=false;
          return mysql_close($this->db);
        }
        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	$type           Type of SQL order ('ddl' for insert, update, select, delete or 'dml' for create, alter...)
	 * @return	resource|true|false   Resultset of answer
	 */
	function query($query,$usesavepoint=0,$type='auto')
	{
		global $conf;

		$query = trim($query);

		if (! in_array($query,array('BEGIN','COMMIT','ROLLBACK'))) dol_syslog('sql='.$query, LOG_DEBUG);

		if (! $this->database_name)
		{
			// Ordre SQL ne necessitant pas de connexion a une base (exemple: CREATE DATABASE)
			$ret = mysql_query($query, $this->db);
		}
		else
		{
			mysql_select_db($this->database_name);
			$ret = mysql_query($query, $this->db);
		}

		if (! preg_match("/^COMMIT/i",$query) && ! preg_match("/^ROLLBACK/i",$query))
		{
			// Si requete utilisateur, on la sauvegarde ainsi que son resultset
			if (! $ret)
			{
				$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: ".$this->lasterrno." ".$this->lasterror, LOG_ERR);
			}
			$this->lastquery=$query;
			$this->_results = $ret;
		}

		return $ret;
	}

	/**
	 *	Renvoie la ligne courante (comme un objet) pour le curseur resultset
	 *
	 *	@param	resource	$resultset  Curseur de la requete voulue
	 *	@return	resource|false		Object result line or false if KO or end of cursor
	 */
	function fetch_object($resultset)
	{
		// If resultset not provided, we take the last used by connexion
		if (! is_resource($resultset)) { $resultset=$this->_results; }
		return mysql_fetch_object($resultset);
	}

	/**
     *	Return datas as an array
     *
     *	@param	resource	$resultset  Resultset of request
     *	@return	array					Array
	 */
	function fetch_array($resultset)
	{
        // If resultset not provided, we take the last used by connexion
		if (! is_resource($resultset)) { $resultset=$this->_results; }
		return mysql_fetch_array($resultset);
	}


	/**
     *	Return datas as an array
     *
     *	@param	resource	$resultset  Resultset of request
     *	@return	array					Array
	 */
	function fetch_row($resultset)
	{
        // If resultset not provided, we take the last used by connexion
		if (! is_resource($resultset)) { $resultset=$this->_results; }
		return @mysql_fetch_row($resultset);
	}

	/**
     *	Return number of lines for result of a SELECT
     *
     *	@param	resource	$resultset  Resulset of requests
     *	@return int		    			Nb of lines
     *	@see    affected_rows
	 */
	function num_rows($resultset)
	{
        // If resultset not provided, we take the last used by connexion
		if (! is_resource($resultset)) { $resultset=$this->_results; }
		return mysql_num_rows($resultset);
	}

	/**
	 *	Renvoie le nombre de lignes dans le resultat d'une requete INSERT, DELETE ou UPDATE
	 *
	 *	@param	resource	$resultset   Curseur de la requete voulue
	 *	@return int		    Nombre de lignes
	 *	@see    num_rows
	 */
	function affected_rows($resultset)
	{
        // If resultset not provided, we take the last used by connexion
		if (! is_resource($resultset)) { $resultset=$this->_results; }
		// mysql necessite un link de base pour cette fonction contrairement
		// a pqsql qui prend un resultset
		return mysql_affected_rows($this->db);
	}


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

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

	/**
     *	Return generic error code of last operation.
     *
     *	@return	string		Error code (Exemples: DB_ERROR_TABLE_ALREADY_EXISTS, DB_ERROR_RECORD_ALREADY_EXISTS...)
	 */
	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 a MySql 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',
            1022 => 'DB_ERROR_KEY_NAME_ALREADY_EXISTS',
			1025 => 'DB_ERROR_NO_FOREIGN_KEY_TO_DROP',
			1044 => 'DB_ERROR_ACCESSDENIED',
			1046 => 'DB_ERROR_NODBSELECTED',
			1048 => 'DB_ERROR_CONSTRAINT',
			1050 => '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',
            1396 => 'DB_ERROR_USER_ALREADY_EXISTS',    // When creating user already existing
			1451 => 'DB_ERROR_CHILD_EXISTS'
			);

			if (isset($errorcode_map[mysql_errno($this->db)]))
			{
				return $errorcode_map[mysql_errno($this->db)];
			}
			$errno=mysql_errno($this->db);
			return ($errno?'DB_ERROR_'.$errno:'0');
		}
	}

	/**
	 *	Return description of last error
	 *
	 *	@return	string		Error text
	 */
	function error()
	{
		if (! $this->connected) {
			// Si il y a eu echec de connexion, $this->db n'est pas valide pour mysql_error.
			return 'Not connected. Check setup parameters in conf/conf.php file and your mysql client and server versions';
		}
		else {
			return mysql_error($this->db);
		}
	}

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



	// Next functions are not required. Only minor features use them.
	//---------------------------------------------------------------

	/**
     *  Encrypt sensitive data in database
     *  Warning: This function includes the escape, so it must use direct value
	 *
     *  @param	string	$fieldorvalue    Field name or value to encrypt
     *  @param  int		$withQuotes      Return string with quotes
     *  @return string			         XXX(field) or XXX('value') or field or 'value'
	 */
	function encrypt($fieldorvalue, $withQuotes=0)
	{
		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:'');

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

		if ($cryptType && !empty($cryptKey))
		{
			if ($cryptType == 2)
			{
				$return = 'AES_ENCRYPT('.$return.',\''.$cryptKey.'\')';
			}
			else if ($cryptType == 1)
			{
				$return = 'DES_ENCRYPT('.$return.',\''.$cryptKey.'\')';
			}
		}

		return $return;
	}

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

		$return = $value;

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

		return $return;
	}


	/**
	 * Return connexion ID
	 *
	 * @return	        string      Id connexion
	 */
	function DDLGetConnectId()
	{
		$resql=$this->query('SELECT CONNECTION_ID()');
		$row=$this->fetch_row($resql);
		return $row[0];
	}


	/**
	 *	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	$owner			Username of database owner
	 * 	@return	false|resource|true	resource defined if OK, null if KO
	 */
	function DDLCreateDb($database,$charset='',$collation='',$owner='')
	{
		if (empty($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);
		if (! $ret)
		{
			// We try again for compatibility with Mysql < 4.1.1
            $sql = "CREATE DATABASE `".$this->escape($database)."`";
			dol_syslog($sql,LOG_DEBUG);
			$ret=$this->query($sql);
		}
		return $ret;
	}

	/**
	 *  List tables into a database
	 *
	 *  @param	string		$database	Name of database
	 *  @param	string		$table		Nmae of table filter ('xxx%')
	 *  @return	array					List of tables in an array
	 */
	function DDLListTables($database, $table='')
	{
		$listtables=array();

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

	/**
	 *	List information of columns into a table.
	 *
	 *	@param	string	$table		Name of table
	 *	@return	array				Tableau des informations des champs de la table
	 */
	function DDLInfoTable($table)
	{
		$infotables=array();

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

		dol_syslog($sql,LOG_DEBUG);
		$result = $this->query($sql);
		while($row = $this->fetch_row($result))
		{
			$infotables[] = $row;
		}
		return $infotables;
	}

	/**
	 *	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	$keys 			Tableau des champs cles noms => valeur
	 *	@return	    int						<0 if KO, >=0 if OK
	 */
	function DDLCreateTable($table,$fields,$primary_key,$type,$unique_keys=null,$fulltext_keys=null,$keys=null)
	{
		// 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]  .= "(".$field_desc['value'].")";
			}
			if( preg_match("/^[^\s]/i",$field_desc['attribute'])) {
				$sqlfields[$i]  .= " ".$field_desc['attribute'];
			}
			if( preg_match("/^[^\s]/i",$field_desc['default']))
			{
				if ((preg_match("/null/i",$field_desc['default'])) || (preg_match("/CURRENT_TIMESTAMP/i",$field_desc['default']))) {
					$sqlfields[$i]  .= " default ".$field_desc['default'];
				}
				else {
					$sqlfields[$i]  .= " default '".$field_desc['default']."'";
				}
			}
			if( preg_match("/^[^\s]/i",$field_desc['null'])) {
				$sqlfields[$i]  .= " ".$field_desc['null'];
			}
			if( preg_match("/^[^\s]/i",$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 '".$key."' ('".$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);
		$sql .=") engine=".$type;

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

	/**
	 *	Return a pointer of line with description of a table or field
	 *
	 *	@param	string		$table	Name of table
	 *	@param	string		$field	Optionnel : Name of field if we want description of field
	 *	@return	false|resource|true	Resource
	 */
	function DDLDescTable($table,$field="")
	{
		$sql="DESC ".$table." ".$field;

		dol_syslog(get_class($this)."::DDLDescTable ".$sql,LOG_DEBUG);
		$this->_results = $this->query($sql);
		return $this->_results;
	}

    /**
	 *	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	$field_position 	Optionnel ex.: "after champtruc"
	 *	@return	int							<0 if KO, >0 if OK
     */
    function DDLAddField($table,$field_name,$field_desc,$field_position="")
    {
        // 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
            $sql.= " default '".$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;
        }
        else
        {
            return 1;
        }
    }

	/**
	 *	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	$field_desc 		Array with description of field format
	 *	@return	int							<0 if KO, >0 if OK
	 */
	function DDLUpdateField($table,$field_name,$field_desc)
	{
		$sql = "ALTER TABLE ".$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'].")";
		}
		if ($field_desc['null'] == 'not null' || $field_desc['null'] == 'NOT NULL') $sql.=" NOT NULL";

		dol_syslog(get_class($this)."::DDLUpdateField ".$sql,LOG_DEBUG);
		if (! $this->query($sql))
		return -1;
		else
		return 1;
	}

	/**
	 *	Drop a field from table
	 *
	 *	@param	string	$table 			Name of table
	 *	@param	string	$field_name 	Name of field to drop
	 *	@return	int						<0 if KO, >0 if OK
	 */
	function DDLDropField($table,$field_name)
	{
		$sql= "ALTER TABLE ".$table." DROP COLUMN `".$field_name."`";
		dol_syslog(get_class($this)."::DDLDropField ".$sql,LOG_DEBUG);
		if (! $this->query($sql))
		{
			$this->error=$this->lasterror();
			return -1;
		}
		else return 1;
	}


	/**
	 * 	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	$dolibarr_main_db_name		Database name where user must be granted
	 *	@return	int									<0 if KO, >=0 if OK
	 */
	function DDLCreateUser($dolibarr_main_db_host,$dolibarr_main_db_user,$dolibarr_main_db_pass,$dolibarr_main_db_name)
	{
        $sql = "CREATE USER '".$this->escape($dolibarr_main_db_user)."'";
        dol_syslog(get_class($this)."::DDLCreateUser", LOG_DEBUG);	// No sql to avoid password in log
        $resql=$this->query($sql);
        if (! $resql)
        {
            if ($this->lasterrno != 'DB_ERROR_USER_ALREADY_EXISTS')
            {
	            return -1;
            }
            else
			{
            	// If user already exists, we continue to set permissions
            	dol_syslog(get_class($this)."::DDLCreateUser sql=".$sql, LOG_WARNING);
            }
        }
        $sql = "GRANT ALL PRIVILEGES ON ".$this->escape($dolibarr_main_db_name).".* TO '".$this->escape($dolibarr_main_db_user)."'@'".$this->escape($dolibarr_main_db_host)."' IDENTIFIED BY '".$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;
        }

        $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
	 */
	function getDefaultCharacterSetDatabase()
	{
		$resql=$this->query('SHOW VARIABLES LIKE \'character_set_database\'');
		if (!$resql)
		{
			// version Mysql < 4.1.1
			return $this->forcecharset;
		}
		$liste=$this->fetch_array($resql);
		return $liste['Value'];
	}

	/**
	 *	Return list of available charset that can be used to store data in database
	 *
	 *	@return		array		List of Charset
	 */
	function getListOfCharacterSet()
	{
		$resql=$this->query('SHOW CHARSET');
		$liste = array();
		if ($resql)
		{
			$i = 0;
			while ($obj = $this->fetch_object($resql) )
			{
				$liste[$i]['charset'] = $obj->Charset;
				$liste[$i]['description'] = $obj->Description;
				$i++;
			}
			$this->free($resql);
		} else {
			// version Mysql < 4.1.1
			return null;
		}
		return $liste;
	}

	/**
	 *	Return collation used in database
	 *
	 *	@return		string		Collation value
	 */
	function getDefaultCollationDatabase()
	{
		$resql=$this->query('SHOW VARIABLES LIKE \'collation_database\'');
		if (!$resql)
		{
			// version Mysql < 4.1.1
			return $this->forcecollate;
		}
		$liste=$this->fetch_array($resql);
		return $liste['Value'];
	}

	/**
	 *	Return list of available collation that can be used for database
	 *
	 *	@return		array		List of Collation
	 */
	function getListOfCollation()
	{
		$resql=$this->query('SHOW COLLATION');
		$liste = array();
		if ($resql)
		{
			$i = 0;
			while ($obj = $this->fetch_object($resql) )
			{
				$liste[$i]['collation'] = $obj->Collation;
				$i++;
			}
			$this->free($resql);
		} else {
			// version Mysql < 4.1.1
			return null;
		}
		return $liste;
	}

	/**
	 *	Return full path of dump program
	 *
	 *	@return		string		Full path of dump program
	 */
	function getPathOfDump()
	{
		$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
	 */
	function getPathOfRestore()
	{
		$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	$filter		Filter list on a particular value
	 * @return	array				Array of key-values (key=>value)
	 */
	function getServerParametersValues($filter='')
	{
		$result=array();

		$sql='SHOW VARIABLES';
		if ($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;
	}

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

