Proyectos de Subversion Moodle

<?php

/**

 * Active Record implementation. Superset of Zend Framework's.

 *

 * This is "Active Record eXtended" to support JOIN, WORK and LAZY mode

 *

 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.

 *

 * @package ADOdb

 * @link https://adodb.org Project's web site and documentation

 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker

 *

 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause

 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,

 * any later version. This means you can use it in proprietary products.

 * See the LICENSE.md file distributed with this source code for details.

 * @license BSD-3-Clause

 * @license LGPL-2.1-or-later

 *

 * @copyright 2000-2013 John Lim

 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community

 */

// CFR: Active Records Definitions

define('ADODB_JOIN_AR', 0x01);

define('ADODB_WORK_AR', 0x02);

define('ADODB_LAZY_AR', 0x03);

global $_ADODB_ACTIVE_DBS;

global $ADODB_ACTIVE_CACHESECS; // set to true to enable caching of metadata such as field info

global $ACTIVE_RECORD_SAFETY; // set to false to disable safety checks

global $ADODB_ACTIVE_DEFVALS; // use default values of table definition when creating new active record.

// array of ADODB_Active_DB's, indexed by ADODB_Active_Record->_dbat

$_ADODB_ACTIVE_DBS = array();

$ACTIVE_RECORD_SAFETY = true; // CFR: disabled while playing with relations

$ADODB_ACTIVE_DEFVALS = false;

class ADODB_Active_DB {

	var $db; // ADOConnection

	var $tables; // assoc array of ADODB_Active_Table objects, indexed by tablename

}

class ADODB_Active_Table {

	var $name; // table name

	var $flds; // assoc array of adofieldobjs, indexed by fieldname

	var $keys; // assoc array of primary keys, indexed by fieldname

	var $_created; // only used when stored as a cached file

	var $_belongsTo = array();

	var $_hasMany = array();

	var $_colsCount; // total columns count, including relations

	function updateColsCount()

	{

		$this->_colsCount = sizeof($this->flds);

		foreach($this->_belongsTo as $foreignTable)

			$this->_colsCount += sizeof($foreignTable->TableInfo()->flds);

		foreach($this->_hasMany as $foreignTable)

			$this->_colsCount += sizeof($foreignTable->TableInfo()->flds);

	}

}

// returns index into $_ADODB_ACTIVE_DBS

function ADODB_SetDatabaseAdapter(&$db)

{

	global $_ADODB_ACTIVE_DBS;

	foreach($_ADODB_ACTIVE_DBS as $k => $d) {

		if ($d->db === $db) {

			return $k;

		}

	}

	$obj = new ADODB_Active_DB();

	$obj->db = $db;

	$obj->tables = array();

	$_ADODB_ACTIVE_DBS[] = $obj;

	return sizeof($_ADODB_ACTIVE_DBS)-1;

}

class ADODB_Active_Record {

	static $_changeNames = true; // dynamically pluralize table names

	static $_foreignSuffix = '_id'; //

	var $_dbat; // associative index pointing to ADODB_Active_DB eg. $ADODB_Active_DBS[_dbat]

	var $_table; // tablename, if set in class definition then use it as table name

	var $_sTable; // singularized table name

	var $_pTable; // pluralized table name

	var $_tableat; // associative index pointing to ADODB_Active_Table, eg $ADODB_Active_DBS[_dbat]->tables[$this->_tableat]

	var $_where; // where clause set in Load()

	var $_saved = false; // indicates whether data is already inserted.

	var $_lasterr = false; // last error message

	var $_original = false; // the original values loaded or inserted, refreshed on update

	var $foreignName; // CFR: class name when in a relationship

	static function UseDefaultValues($bool=null)

	{

	global $ADODB_ACTIVE_DEFVALS;

		if (isset($bool)) {

			$ADODB_ACTIVE_DEFVALS = $bool;

		}

		return $ADODB_ACTIVE_DEFVALS;

	}

	// should be static

	static function SetDatabaseAdapter(&$db)

	{

		return ADODB_SetDatabaseAdapter($db);

	}

	public function __set($name, $value)

	{

		$name = str_replace(' ', '_', $name);

		$this->$name = $value;

	}

	// php5 constructor

	// Note: if $table is defined, then we will use it as our table name

	// Otherwise we will use our classname...

	// In our database, table names are pluralized (because there can be

	// more than one row!)

	// Similarly, if $table is defined here, it has to be plural form.

	//

	// $options is an array that allows us to tweak the constructor's behaviour

	// if $options['refresh'] is true, we re-scan our metadata information

	// if $options['new'] is true, we forget all relations

	function __construct($table = false, $pkeyarr=false, $db=false, $options=array())

	{

	global $_ADODB_ACTIVE_DBS;

		if ($db == false && is_object($pkeyarr)) {

			$db = $pkeyarr;

			$pkeyarr = false;

		}

		if($table) {

			// table argument exists. It is expected to be

			// already plural form.

			$this->_pTable = $table;

			$this->_sTable = $this->_singularize($this->_pTable);

		}

		else {

			// We will use current classname as table name.

			// We need to pluralize it for the real table name.

			$this->_sTable = strtolower(get_class($this));

			$this->_pTable = $this->_pluralize($this->_sTable);

		}

		$this->_table = &$this->_pTable;

		$this->foreignName = $this->_sTable; // CFR: default foreign name (singular)

		if ($db) {

			$this->_dbat = ADODB_Active_Record::SetDatabaseAdapter($db);

		} else

			$this->_dbat = sizeof($_ADODB_ACTIVE_DBS)-1;

		if ($this->_dbat < 0) {

			$this->Error(

				"No database connection set; use ADOdb_Active_Record::SetDatabaseAdapter(\$db)",

				'ADODB_Active_Record::__constructor'

			);

		}

		$this->_tableat = $this->_table; # reserved for setting the assoc value to a non-table name, eg. the sql string in future

		// CFR: Just added this option because UpdateActiveTable() can refresh its information

		// but there was no way to ask it to do that.

		$forceUpdate = (isset($options['refresh']) && true === $options['refresh']);

		$this->UpdateActiveTable($pkeyarr, $forceUpdate);

		if(isset($options['new']) && true === $options['new']) {

			$table =& $this->TableInfo();

			unset($table->_hasMany);

			unset($table->_belongsTo);

			$table->_hasMany = array();

			$table->_belongsTo = array();

		}

	}

	function __wakeup()

	{

		$class = get_class($this);

		new $class;

	}

	// CFR: Constants found in Rails

	static $IrregularP = array(

		'PERSON'    => 'people',

		'MAN'       => 'men',

		'WOMAN'     => 'women',

		'CHILD'     => 'children',

		'COW'       => 'kine',

	);

	static $IrregularS = array(

		'PEOPLE'    => 'PERSON',

		'MEN'       => 'man',

		'WOMEN'     => 'woman',

		'CHILDREN'  => 'child',

		'KINE'      => 'cow',

	);

	static $WeIsI = array(

		'EQUIPMENT' => true,

		'INFORMATION'   => true,

		'RICE'      => true,

		'MONEY'     => true,

		'SPECIES'   => true,

		'SERIES'    => true,

		'FISH'      => true,

		'SHEEP'     => true,

	);

	function _pluralize($table)

	{

		if (!ADODB_Active_Record::$_changeNames) {

			return $table;

		}

		$ut = strtoupper($table);

		if(isset(self::$WeIsI[$ut])) {

			return $table;

		}

		if(isset(self::$IrregularP[$ut])) {

			return self::$IrregularP[$ut];

		}

		$len = strlen($table);

		$lastc = $ut[$len-1];

		$lastc2 = substr($ut,$len-2);

		switch ($lastc) {

			case 'S':

				return $table.'es';

			case 'Y':

				return substr($table,0,$len-1).'ies';

			case 'X':

				return $table.'es';

			case 'H':

				if ($lastc2 == 'CH' || $lastc2 == 'SH') {

					return $table.'es';

				}

			default:

				return $table.'s';

		}

	}

	// CFR Lamest singular inflector ever - @todo Make it real!

	// Note: There is an assumption here...and it is that the argument's length >= 4

	function _singularize($table)

	{

		if (!ADODB_Active_Record::$_changeNames) {

		return $table;

	}

		$ut = strtoupper($table);

		if(isset(self::$WeIsI[$ut])) {

			return $table;

		}

		if(isset(self::$IrregularS[$ut])) {

			return self::$IrregularS[$ut];

		}

		$len = strlen($table);

		if($ut[$len-1] != 'S') {

			return $table; // I know...forget oxen

		}

		if($ut[$len-2] != 'E') {

			return substr($table, 0, $len-1);

		}

		switch($ut[$len-3]) {

			case 'S':

			case 'X':

				return substr($table, 0, $len-2);

			case 'I':

				return substr($table, 0, $len-3) . 'y';

			case 'H';

				if($ut[$len-4] == 'C' || $ut[$len-4] == 'S') {

					return substr($table, 0, $len-2);

				}

			default:

				return substr($table, 0, $len-1); // ?

		}

	}

	/*

	 * ar->foreignName will contain the name of the tables associated with this table because

	 * these other tables' rows may also be referenced by this table using theirname_id or the provided

	 * foreign keys (this index name is stored in ar->foreignKey)

	 *

	 * this-table.id = other-table-#1.this-table_id

	 *               = other-table-#2.this-table_id

	 */

	function hasMany($foreignRef,$foreignKey=false)

	{

		$ar = new ADODB_Active_Record($foreignRef);

		$ar->foreignName = $foreignRef;

		$ar->UpdateActiveTable();

		$ar->foreignKey = ($foreignKey) ? $foreignKey : strtolower(get_class($this)) . self::$_foreignSuffix;

		$table =& $this->TableInfo();

		if(!isset($table->_hasMany[$foreignRef])) {

			$table->_hasMany[$foreignRef] = $ar;

			$table->updateColsCount();

		}

# @todo Can I make this guy be lazy?

		$this->$foreignRef = $table->_hasMany[$foreignRef]; // WATCHME Removed assignment by ref. to please __get()

	}

	/**

	 * ar->foreignName will contain the name of the tables associated with this table because

	 * this table's rows may also be referenced by those tables using thistable_id or the provided

	 * foreign keys (this index name is stored in ar->foreignKey)

	 *

	 * this-table.other-table_id = other-table.id

	 */

	function belongsTo($foreignRef,$foreignKey=false)

	{

		global $inflector;

		$ar = new ADODB_Active_Record($this->_pluralize($foreignRef));

		$ar->foreignName = $foreignRef;

		$ar->UpdateActiveTable();

		$ar->foreignKey = ($foreignKey) ? $foreignKey : $ar->foreignName . self::$_foreignSuffix;

		$table =& $this->TableInfo();

		if(!isset($table->_belongsTo[$foreignRef])) {

			$table->_belongsTo[$foreignRef] = $ar;

			$table->updateColsCount();

		}

		$this->$foreignRef = $table->_belongsTo[$foreignRef];

	}

	/**

	 * __get Access properties - used for lazy loading

	 *

	 * @param mixed $name

	 * @access protected

	 * @return void

	 */

	function __get($name)

	{

		return $this->LoadRelations($name, '', -1. -1);

	}

	function LoadRelations($name, $whereOrderBy, $offset=-1, $limit=-1)

	{

		$extras = array();

		if($offset >= 0) {

			$extras['offset'] = $offset;

		}

		if($limit >= 0) {

			$extras['limit'] = $limit;

		}

		$table =& $this->TableInfo();

		if (strlen($whereOrderBy)) {

			if (!preg_match('/^[ \n\r]*AND/i',$whereOrderBy)) {

				if (!preg_match('/^[ \n\r]*ORDER[ \n\r]/i',$whereOrderBy)) {

					$whereOrderBy = 'AND '.$whereOrderBy;

				}

			}

		}

		if(!empty($table->_belongsTo[$name])) {

			$obj = $table->_belongsTo[$name];

			$columnName = $obj->foreignKey;

			if(empty($this->$columnName)) {

				$this->$name = null;

			}

			else {

				if(($k = reset($obj->TableInfo()->keys))) {

					$belongsToId = $k;

				}

				else {

					$belongsToId = 'id';

				}

				$arrayOfOne =

					$obj->Find(

						$belongsToId.'='.$this->$columnName.' '.$whereOrderBy, false, false, $extras);

				$this->$name = $arrayOfOne[0];

			}

			return $this->$name;

		}

		if(!empty($table->_hasMany[$name])) {

			$obj = $table->_hasMany[$name];

			if(($k = reset($table->keys))) {

				$hasManyId   = $k;

			}

			else {

				$hasManyId   = 'id';

			}

			$this->$name =

				$obj->Find(

					$obj->foreignKey.'='.$this->$hasManyId.' '.$whereOrderBy, false, false, $extras);

			return $this->$name;

		}

	}

	//////////////////////////////////

	// update metadata

	function UpdateActiveTable($pkeys=false,$forceUpdate=false)

	{

	global $_ADODB_ACTIVE_DBS , $ADODB_CACHE_DIR, $ADODB_ACTIVE_CACHESECS;

	global $ADODB_ACTIVE_DEFVALS, $ADODB_FETCH_MODE;

		$activedb = $_ADODB_ACTIVE_DBS[$this->_dbat];

		$table = $this->_table;

		$tables = $activedb->tables;

		$tableat = $this->_tableat;

		if (!$forceUpdate && !empty($tables[$tableat])) {

			$tobj = $tables[$tableat];

			foreach($tobj->flds as $name => $fld) {

				if ($ADODB_ACTIVE_DEFVALS && isset($fld->default_value)) {

					$this->$name = $fld->default_value;

				}

				else {

					$this->$name = null;

				}

			}

			return;

		}

		$db = $activedb->db;

		$fname = $ADODB_CACHE_DIR . '/adodb_' . $db->databaseType . '_active_'. $table . '.cache';

		if (!$forceUpdate && $ADODB_ACTIVE_CACHESECS && $ADODB_CACHE_DIR && file_exists($fname)) {

			$fp = fopen($fname,'r');

			@flock($fp, LOCK_SH);

			$acttab = unserialize(fread($fp,100000));

			fclose($fp);

			if ($acttab->_created + $ADODB_ACTIVE_CACHESECS - (abs(rand()) % 16) > time()) {

				// abs(rand()) randomizes deletion, reducing contention to delete/refresh file

				// ideally, you should cache at least 32 secs

				$activedb->tables[$table] = $acttab;

				//if ($db->debug) ADOConnection::outp("Reading cached active record file: $fname");

					return;

			} else if ($db->debug) {

				ADOConnection::outp("Refreshing cached active record file: $fname");

			}

		}

		$activetab = new ADODB_Active_Table();

		$activetab->name = $table;

		$save = $ADODB_FETCH_MODE;

		$ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;

		if ($db->fetchMode !== false) {

			$savem = $db->SetFetchMode(false);

		}

		$cols = $db->MetaColumns($table);

		if (isset($savem)) {

			$db->SetFetchMode($savem);

		}

		$ADODB_FETCH_MODE = $save;

		if (!$cols) {

			$this->Error("Invalid table name: $table",'UpdateActiveTable');

			return false;

		}

		$fld = reset($cols);

		if (!$pkeys) {

			if (isset($fld->primary_key)) {

				$pkeys = array();

				foreach($cols as $name => $fld) {

					if (!empty($fld->primary_key)) {

						$pkeys[] = $name;

					}

				}

			} else {

				$pkeys = $this->GetPrimaryKeys($db, $table);

			}

		}

		if (empty($pkeys)) {

			$this->Error("No primary key found for table $table",'UpdateActiveTable');

			return false;

		}

		$attr = array();

		$keys = array();

		switch (ADODB_ASSOC_CASE) {

		case ADODB_ASSOC_CASE_LOWER:

			foreach($cols as $name => $fldobj) {

				$name = strtolower($name);

				if ($ADODB_ACTIVE_DEFVALS && isset($fldobj->default_value)) {

					$this->$name = $fldobj->default_value;

				}

				else {

					$this->$name = null;

				}

				$attr[$name] = $fldobj;

			}

			foreach($pkeys as $k => $name) {

				$keys[strtolower($name)] = strtolower($name);

			}

			break;

		case ADODB_ASSOC_CASE_UPPER:

			foreach($cols as $name => $fldobj) {

				$name = strtoupper($name);

				if ($ADODB_ACTIVE_DEFVALS && isset($fldobj->default_value)) {

					$this->$name = $fldobj->default_value;

				}

				else {

					$this->$name = null;

				}

				$attr[$name] = $fldobj;

			}

			foreach($pkeys as $k => $name) {

				$keys[strtoupper($name)] = strtoupper($name);

			}

			break;

		default:

			foreach($cols as $name => $fldobj) {

				$name = ($fldobj->name);

				if ($ADODB_ACTIVE_DEFVALS && isset($fldobj->default_value)) {

					$this->$name = $fldobj->default_value;

				}

				else {

					$this->$name = null;

				}

				$attr[$name] = $fldobj;

			}

			foreach($pkeys as $k => $name) {

				$keys[$name] = $cols[$name]->name;

			}

			break;

		}

		$activetab->keys = $keys;

		$activetab->flds = $attr;

		$activetab->updateColsCount();

		if ($ADODB_ACTIVE_CACHESECS && $ADODB_CACHE_DIR) {

			$activetab->_created = time();

			$s = serialize($activetab);

			if (!function_exists('adodb_write_file')) {

				include_once(ADODB_DIR.'/adodb-csvlib.inc.php');

			}

			adodb_write_file($fname,$s);

		}

		if (isset($activedb->tables[$table])) {

			$oldtab = $activedb->tables[$table];

			if ($oldtab) {

				$activetab->_belongsTo = $oldtab->_belongsTo;

				$activetab->_hasMany = $oldtab->_hasMany;

			}

		}

		$activedb->tables[$table] = $activetab;

	}

	function GetPrimaryKeys(&$db, $table)

	{

		return $db->MetaPrimaryKeys($table);

	}

	// error handler for both PHP4+5.

	function Error($err,$fn)

	{

	global $_ADODB_ACTIVE_DBS;

		$fn = get_class($this).'::'.$fn;

		$this->_lasterr = $fn.': '.$err;

		if ($this->_dbat < 0) {

			$db = false;

		}

		else {

			$activedb = $_ADODB_ACTIVE_DBS[$this->_dbat];

			$db = $activedb->db;

		}

		if (function_exists('adodb_throw')) {

			if (!$db) {

				adodb_throw('ADOdb_Active_Record', $fn, -1, $err, 0, 0, false);

			}

			else {

				adodb_throw($db->databaseType, $fn, -1, $err, 0, 0, $db);

			}

		} else {

			if (!$db || $db->debug) {

				ADOConnection::outp($this->_lasterr);

			}

		}

	}

	// return last error message

	function ErrorMsg()

	{

		if (!function_exists('adodb_throw')) {

			if ($this->_dbat < 0) {

				$db = false;

			}

			else {

				$db = $this->DB();

			}

			// last error could be database error too

			if ($db && $db->ErrorMsg()) {

				return $db->ErrorMsg();

			}

		}

		return $this->_lasterr;

	}

	function ErrorNo()

	{

		if ($this->_dbat < 0) {

			return -9999; // no database connection...

		}

		$db = $this->DB();

		return (int) $db->ErrorNo();

	}

	// retrieve ADOConnection from _ADODB_Active_DBs

	function DB()

	{

	global $_ADODB_ACTIVE_DBS;

		if ($this->_dbat < 0) {

			$false = false;

			$this->Error("No database connection set: use ADOdb_Active_Record::SetDatabaseAdaptor(\$db)", "DB");

			return $false;

		}

		$activedb = $_ADODB_ACTIVE_DBS[$this->_dbat];

		$db = $activedb->db;

		return $db;

	}

	// retrieve ADODB_Active_Table

	function &TableInfo()

	{

	global $_ADODB_ACTIVE_DBS;

		$activedb = $_ADODB_ACTIVE_DBS[$this->_dbat];

		$table = $activedb->tables[$this->_tableat];

		return $table;

	}

	// I have an ON INSERT trigger on a table that sets other columns in the table.

	// So, I find that for myTable, I want to reload an active record after saving it. -- Malcolm Cook

	function Reload()

	{

		$db =& $this->DB();

		if (!$db) {

			return false;

		}

		$table =& $this->TableInfo();

		$where = $this->GenWhere($db, $table);

		return($this->Load($where));

	}

	// set a numeric array (using natural table field ordering) as object properties

	function Set(&$row)

	{

	global $ACTIVE_RECORD_SAFETY;

		$db = $this->DB();

		if (!$row) {

			$this->_saved = false;

			return false;

		}

		$this->_saved = true;

		$table = $this->TableInfo();

		$sizeofFlds = sizeof($table->flds);

		$sizeofRow  = sizeof($row);

		if ($ACTIVE_RECORD_SAFETY && $table->_colsCount != $sizeofRow && $sizeofFlds != $sizeofRow) {

			# <AP>

			$bad_size = TRUE;

			if($sizeofRow == 2 * $table->_colsCount || $sizeofRow == 2 * $sizeofFlds) {

				// Only keep string keys

				$keys = array_filter(array_keys($row), 'is_string');

				if (sizeof($keys) == sizeof($table->flds)) {

					$bad_size = FALSE;

				}

			}

			if ($bad_size) {

				$this->Error("Table structure of $this->_table has changed","Load");

				return false;

			}

			# </AP>

		}

		else {

			$keys = array_keys($row);

		}

		# <AP>

		reset($keys);

		$this->_original = array();

		foreach($table->flds as $name=>$fld) {

			$value = $row[current($keys)];

			$this->$name = $value;

			$this->_original[] = $value;

			if(!next($keys)) {

				break;

			}

		}

		$table =& $this->TableInfo();

		foreach($table->_belongsTo as $foreignTable) {

			$ft = $foreignTable->TableInfo();

			$propertyName = $ft->name;

			foreach($ft->flds as $name=>$fld) {

				$value = $row[current($keys)];

				$foreignTable->$name = $value;

				$foreignTable->_original[] = $value;

				if(!next($keys)) {

					break;

				}

			}

		}

		foreach($table->_hasMany as $foreignTable) {

			$ft = $foreignTable->TableInfo();

			foreach($ft->flds as $name=>$fld) {

				$value = $row[current($keys)];

				$foreignTable->$name = $value;

				$foreignTable->_original[] = $value;

				if(!next($keys)) {

					break;

				}

			}

		}

		# </AP>

		return true;

	}

	// get last inserted id for INSERT

	function LastInsertID(&$db,$fieldname)

	{

		if ($db->hasInsertID) {

			$val = $db->Insert_ID($this->_table,$fieldname);

		}

		else {

			$val = false;

		}

		if (is_null($val) || $val === false) {

			// this might not work reliably in multi-user environment

			return $db->GetOne("select max(".$fieldname.") from ".$this->_table);

		}

		return $val;

	}

	// quote data in where clause

	function doquote(&$db, $val,$t)

	{

		switch($t) {

		case 'D':

		case 'T':

			if (empty($val)) {

				return 'null';

			}

		case 'C':

		case 'X':

			if (is_null($val)) {

				return 'null';

			}

			if (strlen($val)>0 &&

				(strncmp($val,"'",1) != 0 || substr($val,strlen($val)-1,1) != "'")

			) {

				return $db->qstr($val);

				break;

			}

		default:

			return $val;

			break;

		}

	}

	// generate where clause for an UPDATE/SELECT

	function GenWhere(&$db, &$table)

	{

		$keys = $table->keys;

		$parr = array();

		foreach($keys as $k) {

			$f = $table->flds[$k];

			if ($f) {

				$parr[] = $k.' = '.$this->doquote($db,$this->$k,$db->MetaType($f->type));

			}

		}

		return implode(' and ', $parr);

	}

	//------------------------------------------------------------ Public functions below

	function Load($where=null,$bindarr=false)

	{

		$db = $this->DB();

		if (!$db) {

			return false;

		}

		$this->_where = $where;

		$save = $db->SetFetchMode(ADODB_FETCH_NUM);

		$qry = "select * from ".$this->_table;

		$table =& $this->TableInfo();

		if(($k = reset($table->keys))) {

			$hasManyId   = $k;

		}

		else {

			$hasManyId   = 'id';

		}

		foreach($table->_belongsTo as $foreignTable) {

			if(($k = reset($foreignTable->TableInfo()->keys))) {

				$belongsToId = $k;

			}

			else {

				$belongsToId = 'id';

			}

			$qry .= ' LEFT JOIN '.$foreignTable->_table.' ON '.

				$this->_table.'.'.$foreignTable->foreignKey.'='.

				$foreignTable->_table.'.'.$belongsToId;

		}

		foreach($table->_hasMany as $foreignTable)

		{

			$qry .= ' LEFT JOIN '.$foreignTable->_table.' ON '.

				$this->_table.'.'.$hasManyId.'='.

				$foreignTable->_table.'.'.$foreignTable->foreignKey;

		}

		if($where) {

			$qry .= ' WHERE '.$where;

		}

		// Simple case: no relations. Load row and return.

		if((count($table->_hasMany) + count($table->_belongsTo)) < 1) {

			$row = $db->GetRow($qry,$bindarr);

			if(!$row) {

				return false;

			}

			$db->SetFetchMode($save);

			return $this->Set($row);

		}

		// More complex case when relations have to be collated

		$rows = $db->GetAll($qry,$bindarr);

		if(!$rows) {

			return false;

		}

		$db->SetFetchMode($save);

		if(count($rows) < 1) {

			return false;

		}

		$class = get_class($this);

		$isFirstRow = true;

		if(($k = reset($this->TableInfo()->keys))) {

			$myId   = $k;

		}

		else {

			$myId   = 'id';

		}

		$index = 0; $found = false;

		/** @todo Improve by storing once and for all in table metadata */

		/** @todo Also re-use info for hasManyId */

		foreach($this->TableInfo()->flds as $fld) {

			if($fld->name == $myId) {

				$found = true;

				break;

			}

			$index++;

		}

		if(!$found) {

			$this->outp_throw("Unable to locate key $myId for $class in Load()",'Load');

		}

		foreach($rows as $row) {

			$rowId = intval($row[$index]);

			if($rowId > 0) {

				if($isFirstRow) {

					$isFirstRow = false;

					if(!$this->Set($row)) {

						return false;

					}

				}

				$obj = new $class($table,false,$db);

				$obj->Set($row);

				// TODO Copy/paste code below: bad!

				if(count($table->_hasMany) > 0) {

					foreach($table->_hasMany as $foreignTable) {

						$foreignName = $foreignTable->foreignName;

						if(!empty($obj->$foreignName)) {

							if(!is_array($this->$foreignName)) {

								$foreignObj = $this->$foreignName;

								$this->$foreignName = array(clone($foreignObj));

							}

							else {

								$foreignObj = $obj->$foreignName;

								array_push($this->$foreignName, clone($foreignObj));

							}

						}

					}

				}

				if(count($table->_belongsTo) > 0) {

					foreach($table->_belongsTo as $foreignTable) {

						$foreignName = $foreignTable->foreignName;

						if(!empty($obj->$foreignName)) {

							if(!is_array($this->$foreignName)) {

								$foreignObj = $this->$foreignName;

								$this->$foreignName = array(clone($foreignObj));

							}

							else {

								$foreignObj = $obj->$foreignName;

								array_push($this->$foreignName, clone($foreignObj));

							}

						}

					}

				}

			}

		}

		return true;

	}

	// false on error

	function Save()

	{

		if ($this->_saved) {

			$ok = $this->Update();

		}

		else {

			$ok = $this->Insert();

		}

		return $ok;

	}

	// CFR: Sometimes we may wish to consider that an object is not to be replaced but inserted.

	// Sample use case: an 'undo' command object (after a delete())

	function Dirty()

	{

		$this->_saved = false;

	}

	// false on error

	function Insert()

	{

		$db = $this->DB();

		if (!$db) {

			return false;

		}

		$cnt = 0;

		$table = $this->TableInfo();

		$valarr = array();

		$names = array();

		$valstr = array();

		foreach($table->flds as $name=>$fld) {

			$val = $this->$name;

			if(!is_null($val) || !array_key_exists($name, $table->keys)) {

				$valarr[] = $val;

				$names[] = $name;

				$valstr[] = $db->Param($cnt);

				$cnt += 1;

			}

		}

		if (empty($names)){

			foreach($table->flds as $name=>$fld) {

				$valarr[] = null;

				$names[] = $name;

				$valstr[] = $db->Param($cnt);

				$cnt += 1;

			}

		}

		$sql = 'INSERT INTO '.$this->_table."(".implode(',',$names).') VALUES ('.implode(',',$valstr).')';

		$ok = $db->Execute($sql,$valarr);

		if ($ok) {

			$this->_saved = true;

			$autoinc = false;

			foreach($table->keys as $k) {

				if (is_null($this->$k)) {

					$autoinc = true;

					break;

				}

			}

			if ($autoinc && sizeof($table->keys) == 1) {

				$k = reset($table->keys);