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<?
//****************************************************************************
// phpDBTree 1.4
//****************************************************************************
// Author: Maxim Poltarak <maxx at e dash taller dot net>
// WWW: http://dev.e-taller.net/dbtree/
// Category: Databases
// Description: PHP class implementing a Nested Sets approach to storing
// tree-like structures in database tables. This technique was
// introduced by Joe Celko <http://www.celko.com/> and has some
// advantages over a widely used method called Adjacency Matrix.
//****************************************************************************
// The lib is FREEWARE. That means you may use it anywhere you want, you may
// do anything with it. The Author mentioned above is NOT responsible for any
// consequences of using this library.
// If you don't agree with this, you are NOT ALLOWED to use the lib!
//****************************************************************************
// You're welcome to send me all improvings, feature requests, bug reports...
//****************************************************************************
// SAMPLE DB TABLE STRUCTURE:
//
// CREATE TABLE categories (
// cat_id INT UNSIGNED NOT NULL AUTO_INCREMENT,
// cat_left INT UNSIGNED NOT NULL,
// cat_right INT UNSIGNED NOT NULL,
// cat_level INT UNSIGNED NOT NULL,
// PRIMARY KEY(cat_id),
// KEY(cat_left, cat_right, cat_level)
// );
//
// This is believed to be the optimal Nested Sets use case. Use `one-to-one`
// relations on `cat_id` field between this `structure` table and
// another `data` table in your database.
//
// Don't forget to make a single call to clear()
// to set up the Root node in an empty table.
//
//****************************************************************************
// NOTE: Although you may use this library to retrieve data from the table,
// it is recommended to write your own queries for doing that.
// The main purpose of the library is to provide a simpler way to
// create, update and delete records. Not to SELECT them.
//****************************************************************************
//
// IMPORTANT! DO NOT create either UNIQUE or PRIMARY keys on the set of
// fields (`cat_left`, `cat_right` and `cat_level`)!
// Unique keys will destroy the Nested Sets structure!
//
//****************************************************************************
// CHANGELOG:
// 16-Apr-2003 -=- 1.1
// - Added moveAll() method
// - Added fourth parameter to the constructor
// - Renamed getElementInfo() to getNodeInfo() /keeping BC/
// - Added "Sample Table Structure" comment
// - Now it trigger_error()'s in case of any serious error, because if not you
// will lose the Nested Sets structure in your table
// 19-Feb-2004 -=- 1.2
// - Fixed a bug in moveAll() method?
// Thanks to Maxim Matyukhin for the patch.
// 13-Jul-2004 -=- 1.3
// - Changed all die()'s for a more standard trigger_error()
// Thanks to Dmitry Romakhin for pointing out an issue with
// incorrect error message call.
// 09-Nov-2004 -=- 1.4
// - Added insertNear() method.
// Thanks to Michael Krenz who sent its implementation.
// - Removed IGNORE keyword from UPDATE clauses in insert() methods.
// It was dumb to have it there all the time. Sorry. Anyway, you had
// to follow the important note mencioned above. If you hadn't, you're
// in problem.
//
//****************************************************************************
// Note: For best viewing of the code Tab size 4 is recommended
//****************************************************************************
class CDBTree {
var $db; // CDatabase class to plug to
var $table; // Table with Nested Sets implemented
var $id; // Name of the ID-auto_increment-field in the table.
// These 3 variables are names of fields which are needed to implement
// Nested Sets. All 3 fields should exist in your table!
// However, you may want to change their names here to avoid name collisions.
var $left = 'cat_left';
var $right = 'cat_right';
var $level = 'cat_level';
var $qryParams = '';
var $qryFields = '';
var $qryTables = '';
var $qryWhere = '';
var $qryGroupBy = '';
var $qryHaving = '';
var $qryOrderBy = '';
var $qryLimit = '';
var $sqlNeedReset = true;
var $sql; // Last SQL query
//************************************************************************
// Constructor
// $DB : CDatabase class instance to link to
// $tableName : table in database where to implement nested sets
// $itemId : name of the field which will uniquely identify every record
// $fieldNames : optional configuration array to set field names. Example:
// array(
// 'left' => 'cat_left',
// 'right' => 'cat_right',
// 'level' => 'cat_level'
// )
function CDBTree(&$DB, $tableName, $itemId, $fieldNames=array()) {
if(empty($tableName)) trigger_error("phpDbTree: Unknown table", E_USER_ERROR);
if(empty($itemId)) trigger_error("phpDbTree: Unknown ID column", E_USER_ERROR);
$this->db = $DB;
$this->table = $tableName;
$this->id = $itemId;
if(is_array($fieldNames) && sizeof($fieldNames))
foreach($fieldNames as $k => $v)
$this->$k = $v;
}
//************************************************************************
// Returns a Left and Right IDs and Level of an element or false on error
// $ID : an ID of the element
function getElementInfo($ID) { return $this->getNodeInfo($ID); }
function getNodeInfo($ID) {
$this->sql = 'SELECT '.$this->left.','.$this->right.','.$this->level.' FROM '.$this->table.' WHERE '.$this->id.'=\''.$ID.'\'';
if(($query=$this->db->query($this->sql)) && ($this->db->num_rows($query) == 1) && ($Data = $this->db->fetch_array($query)))
return array((int)$Data[$this->left], (int)$Data[$this->right], (int)$Data[$this->level]);
else trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
}
//************************************************************************
// Clears table and creates 'root' node
// $data : optional argument with data for the root node
function clear($data=array()) {
// clearing table
if((!$this->db->query('TRUNCATE '.$this->table)) && (!$this->db->query('DELETE FROM '.$this->table))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
// preparing data to be inserted
if(sizeof($data)) {
$fld_names = implode(',', array_keys($data)).',';
if(sizeof($data)) $fld_values = '\''.implode('\',\'', array_values($data)).'\',';
}
$fld_names .= $this->left.','.$this->right.','.$this->level;
$fld_values .= '1,2,0';
// inserting new record
$this->sql = 'INSERT INTO '.$this->table.'('.$fld_names.') VALUES('.$fld_values.')';
if(!($this->db->query($this->sql))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
return $this->db->insert_id();
}
//************************************************************************
// Updates a record
// $ID : element ID
// $data : array with data to update: array(<field_name> => <fields_value>)
function update($ID, $data) {
$sql_set = '';
foreach($data as $k=>$v) $sql_set .= ','.$k.'=\''.addslashes($v).'\'';
return $this->db->query('UPDATE '.$this->table.' SET '.substr($sql_set,1).' WHERE '.$this->id.'=\''.$ID.'\'');
}
//************************************************************************
// Inserts a record into the table with nested sets
// $ID : an ID of the parent element
// $data : array with data to be inserted: array(<field_name> => <field_value>)
// Returns : true on success, or false on error
function insert($ID, $data) {
if(!(list($leftId, $rightId, $level) = $this->getNodeInfo($ID))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
// preparing data to be inserted
if(sizeof($data)) {
$fld_names = implode(',', array_keys($data)).',';
$fld_values = '\''.implode('\',\'', array_values($data)).'\',';
}
$fld_names .= $this->left.','.$this->right.','.$this->level;
$fld_values .= ($rightId).','.($rightId+1).','.($level+1);
// creating a place for the record being inserted
if($ID) {
$this->sql = 'UPDATE '.$this->table.' SET '
. $this->left.'=IF('.$this->left.'>'.$rightId.','.$this->left.'+2,'.$this->left.'),'
. $this->right.'=IF('.$this->right.'>='.$rightId.','.$this->right.'+2,'.$this->right.')'
. 'WHERE '.$this->right.'>='.$rightId;
if(!($this->db->query($this->sql))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
}
// inserting new record
$this->sql = 'INSERT INTO '.$this->table.'('.$fld_names.') VALUES('.$fld_values.')';
if(!($this->db->query($this->sql))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
return $this->db->insert_id();
}
//************************************************************************
// Inserts a record into the table with nested sets
// $ID : ID of the element after which (i.e. at the same level) the new element
// is to be inserted
// $data : array with data to be inserted: array(<field_name> => <field_value>)
// Returns : true on success, or false on error
function insertNear($ID, $data) {
if(!(list($leftId, $rightId, $level) = $this->getNodeInfo($ID)))
trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
// preparing data to be inserted
if(sizeof($data)) {
$fld_names = implode(',', array_keys($data)).',';
$fld_values = '\''.implode('\',\'', array_values($data)).'\',';
}
$fld_names .= $this->left.','.$this->right.','.$this->level;
$fld_values .= ($rightId+1).','.($rightId+2).','.($level);
// creating a place for the record being inserted
if($ID) {
$this->sql = 'UPDATE '.$this->table.' SET '
.$this->left.'=IF('.$this->left.'>'.$rightId.','.$this->left.'+2,'.$this->left.'),'
.$this->right.'=IF('.$this->right.'>'.$rightId.','.$this->right.'+2,'.$this->right.')'
. 'WHERE '.$this->right.'>'.$rightId;
if(!($this->db->query($this->sql))) trigger_error("phpDbTree error:".$this->db->error(), E_USER_ERROR);
}
// inserting new record
$this->sql = 'INSERT INTO '.$this->table.'('.$fld_names.') VALUES('.$fld_values.')';
if(!($this->db->query($this->sql))) trigger_error("phpDbTree error:".$this->db->error(), E_USER_ERROR);
return $this->db->insert_id();
}
//************************************************************************
// Assigns a node with all its children to another parent
// $ID : node ID
// $newParentID : ID of new parent node
// Returns : false on error
function moveAll($ID, $newParentId) {
if(!(list($leftId, $rightId, $level) = $this->getNodeInfo($ID))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
if(!(list($leftIdP, $rightIdP, $levelP) = $this->getNodeInfo($newParentId))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
if($ID == $newParentId || $leftId == $leftIdP || ($leftIdP >= $leftId && $leftIdP <= $rightId)) return false;
// whether it is being moved upwards along the path
if ($leftIdP < $leftId && $rightIdP > $rightId && $levelP < $level - 1 ) {
$this->sql = 'UPDATE '.$this->table.' SET '
. $this->level.'=IF('.$this->left.' BETWEEN '.$leftId.' AND '.$rightId.', '.$this->level.sprintf('%+d', -($level-1)+$levelP).', '.$this->level.'), '
. $this->right.'=IF('.$this->right.' BETWEEN '.($rightId+1).' AND '.($rightIdP-1).', '.$this->right.'-'.($rightId-$leftId+1).', '
.'IF('.$this->left.' BETWEEN '.($leftId).' AND '.($rightId).', '.$this->right.'+'.((($rightIdP-$rightId-$level+$levelP)/2)*2 + $level - $levelP - 1).', '.$this->right.')), '
. $this->left.'=IF('.$this->left.' BETWEEN '.($rightId+1).' AND '.($rightIdP-1).', '.$this->left.'-'.($rightId-$leftId+1).', '
.'IF('.$this->left.' BETWEEN '.$leftId.' AND '.($rightId).', '.$this->left.'+'.((($rightIdP-$rightId-$level+$levelP)/2)*2 + $level - $levelP - 1).', '.$this->left. ')) '
. 'WHERE '.$this->left.' BETWEEN '.($leftIdP+1).' AND '.($rightIdP-1)
;
} elseif($leftIdP < $leftId) {
$this->sql = 'UPDATE '.$this->table.' SET '
. $this->level.'=IF('.$this->left.' BETWEEN '.$leftId.' AND '.$rightId.', '.$this->level.sprintf('%+d', -($level-1)+$levelP).', '.$this->level.'), '
. $this->left.'=IF('.$this->left.' BETWEEN '.$rightIdP.' AND '.($leftId-1).', '.$this->left.'+'.($rightId-$leftId+1).', '
. 'IF('.$this->left.' BETWEEN '.$leftId.' AND '.$rightId.', '.$this->left.'-'.($leftId-$rightIdP).', '.$this->left.') '
. '), '
. $this->right.'=IF('.$this->right.' BETWEEN '.$rightIdP.' AND '.$leftId.', '.$this->right.'+'.($rightId-$leftId+1).', '
. 'IF('.$this->right.' BETWEEN '.$leftId.' AND '.$rightId.', '.$this->right.'-'.($leftId-$rightIdP).', '.$this->right.') '
. ') '
. 'WHERE '.$this->left.' BETWEEN '.$leftIdP.' AND '.$rightId
// !!! added this line (Maxim Matyukhin)
.' OR '.$this->right.' BETWEEN '.$leftIdP.' AND '.$rightId
;
} else {
$this->sql = 'UPDATE '.$this->table.' SET '
. $this->level.'=IF('.$this->left.' BETWEEN '.$leftId.' AND '.$rightId.', '.$this->level.sprintf('%+d', -($level-1)+$levelP).', '.$this->level.'), '
. $this->left.'=IF('.$this->left.' BETWEEN '.$rightId.' AND '.$rightIdP.', '.$this->left.'-'.($rightId-$leftId+1).', '
. 'IF('.$this->left.' BETWEEN '.$leftId.' AND '.$rightId.', '.$this->left.'+'.($rightIdP-1-$rightId).', '.$this->left.')'
. '), '
. $this->right.'=IF('.$this->right.' BETWEEN '.($rightId+1).' AND '.($rightIdP-1).', '.$this->right.'-'.($rightId-$leftId+1).', '
. 'IF('.$this->right.' BETWEEN '.$leftId.' AND '.$rightId.', '.$this->right.'+'.($rightIdP-1-$rightId).', '.$this->right.') '
. ') '
. 'WHERE '.$this->left.' BETWEEN '.$leftId.' AND '.$rightIdP
// !!! added this line (Maxim Matyukhin)
. ' OR '.$this->right.' BETWEEN '.$leftId.' AND '.$rightIdP
;
}
return $this->db->query($this->sql) or trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
}
//************************************************************************
// Deletes a record wihtout deleting its children
// $ID : an ID of the element to be deleted
// Returns : true on success, or false on error
function delete($ID) {
if(!(list($leftId, $rightId, $level) = $this->getNodeInfo($ID))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
// Deleting record
$this->sql = 'DELETE FROM '.$this->table.' WHERE '.$this->id.'=\''.$ID.'\'';
if(!$this->db->query($this->sql)) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
// Clearing blank spaces in a tree
$this->sql = 'UPDATE '.$this->table.' SET '
. $this->left.'=IF('.$this->left.' BETWEEN '.$leftId.' AND '.$rightId.','.$this->left.'-1,'.$this->left.'),'
. $this->right.'=IF('.$this->right.' BETWEEN '.$leftId.' AND '.$rightId.','.$this->right.'-1,'.$this->right.'),'
. $this->level.'=IF('.$this->left.' BETWEEN '.$leftId.' AND '.$rightId.','.$this->level.'-1,'.$this->level.'),'
. $this->left.'=IF('.$this->left.'>'.$rightId.','.$this->left.'-2,'.$this->left.'),'
. $this->right.'=IF('.$this->right.'>'.$rightId.','.$this->right.'-2,'.$this->right.') '
. 'WHERE '.$this->right.'>'.$leftId
;
if(!$this->db->query($this->sql)) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
return true;
}
//************************************************************************
// Deletes a record with all its children
// $ID : an ID of the element to be deleted
// Returns : true on success, or false on error
function deleteAll($ID) {
if(!(list($leftId, $rightId, $level) = $this->getNodeInfo($ID))) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
// Deleteing record(s)
$this->sql = 'DELETE FROM '.$this->table.' WHERE '.$this->left.' BETWEEN '.$leftId.' AND '.$rightId;
if(!$this->db->query($this->sql)) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
// Clearing blank spaces in a tree
$deltaId = ($rightId - $leftId)+1;
$this->sql = 'UPDATE '.$this->table.' SET '
. $this->left.'=IF('.$this->left.'>'.$leftId.','.$this->left.'-'.$deltaId.','.$this->left.'),'
. $this->right.'=IF('.$this->right.'>'.$leftId.','.$this->right.'-'.$deltaId.','.$this->right.') '
. 'WHERE '.$this->right.'>'.$rightId
;
if(!$this->db->query($this->sql)) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
return true;
}
//************************************************************************
// Enumerates children of an element
// $ID : an ID of an element which children to be enumerated
// $start_level : relative level from which start to enumerate children
// $end_level : the last relative level at which enumerate children
// 1. If $end_level isn't given, only children of
// $start_level levels are enumerated
// 2. Level values should always be greater than zero.
// Level 1 means direct children of the element
// Returns : a result id for using with other DB functions
function enumChildrenAll($ID) { return $this->enumChildren($ID, 1, 0); }
function enumChildren($ID, $start_level=1, $end_level=1) {
if($start_level < 0) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
// We could use sprintf() here, but it'd be too slow
$whereSql1 = ' AND '.$this->table.'.'.$this->level;
$whereSql2 = '_'.$this->table.'.'.$this->level.'+';
if(!$end_level) $whereSql = $whereSql1.'>='.$whereSql2.(int)$start_level;
else {
$whereSql = ($end_level <= $start_level)
? $whereSql1.'='.$whereSql2.(int)$start_level
: ' AND '.$this->table.'.'.$this->level.' BETWEEN _'.$this->table.'.'.$this->level.'+'.(int)$start_level
.' AND _'.$this->table.'.'.$this->level.'+'.(int)$end_level;
}
$this->sql = $this->sqlComposeSelect(array(
'', // Params
'', // Fields
$this->table.' _'.$this->table.', '.$this->table, // Tables
'_'.$this->table.'.'.$this->id.'=\''.$ID.'\''
.' AND '.$this->table.'.'.$this->left.' BETWEEN _'.$this->table.'.'.$this->left.' AND _'.$this->table.'.'.$this->right
.$whereSql
));
return $this->db->query($this->sql);
}
//************************************************************************
// Enumerates the PATH from an element to its top level parent
// $ID : an ID of an element
// $showRoot : whether to show root node in a path
// Returns : a result id for using with other DB functions
function enumPath($ID, $showRoot=false) {
$this->sql = $this->sqlComposeSelect(array(
'', // Params
'', // Fields
$this->table.' _'.$this->table.', '.$this->table, // Tables
'_'.$this->table.'.'.$this->id.'=\''.$ID.'\''
.' AND _'.$this->table.'.'.$this->left.' BETWEEN '.$this->table.'.'.$this->left.' AND '.$this->table.'.'.$this->right
.(($showRoot) ? '' : ' AND '.$this->table.'.'.$this->level.'>0'), // Where
'', // GroupBy
'', // Having
$this->table.'.'.$this->left // OrderBy
));
return $this->db->query($this->sql);
}
//************************************************************************
// Returns query result to fetch data of the element's parent
// $ID : an ID of an element which parent to be retrieved
// $level : Relative level of parent
// Returns : a result id for using with other DB functions
function getParent($ID, $level=1) {
if($level < 1) trigger_error("phpDbTree error: ".$this->db->error(), E_USER_ERROR);
$this->sql = $this->sqlComposeSelect(array(
'', // Params
'', // Fields
$this->table.' _'.$this->table.', '.$this->table, // Tables
'_'.$this->table.'.'.$this->id.'=\''.$ID.'\''
.' AND _'.$this->table.'.'.$this->left.' BETWEEN '.$this->table.'.'.$this->left.' AND '.$this->table.'.'.$this->right
.' AND '.$this->table.'.'.$this->level.'=_'.$this->table.'.'.$this->level.'-'.(int)$level // Where
));
return $this->db->query($this->sql);
}
//************************************************************************
function sqlReset() {
$this->qryParams = ''; $this->qryFields = ''; $this->qryTables = '';
$this->qryWhere = ''; $this->qryGroupBy = ''; $this->qryHaving = '';
$this->qryOrderBy = ''; $this->qryLimit = '';
return true;
}
//************************************************************************
function sqlSetReset($resetMode) { $this->sqlNeedReset = ($resetMode) ? true : false; }
//************************************************************************
function sqlParams($param='') { return (empty($param)) ? $this->qryParams : $this->qryParams = $param; }
function sqlFields($param='') { return (empty($param)) ? $this->qryFields : $this->qryFields = $param; }
function sqlSelect($param='') { return $this->sqlFields($param); }
function sqlTables($param='') { return (empty($param)) ? $this->qryTables : $this->qryTables = $param; }
function sqlFrom($param='') { return $this->sqlTables($param); }
function sqlWhere($param='') { return (empty($param)) ? $this->qryWhere : $this->qryWhere = $param; }
function sqlGroupBy($param='') { return (empty($param)) ? $this->qryGroupBy : $this->qryGroupBy = $param; }
function sqlHaving($param='') { return (empty($param)) ? $this->qryHaving : $this->qryHaving = $param; }
function sqlOrderBy($param='') { return (empty($param)) ? $this->qryOrderBy : $this->qryOrderBy = $param; }
function sqlLimit($param='') { return (empty($param)) ? $this->qryLimit : $this->qryLimit = $param; }
//************************************************************************
function sqlComposeSelect($arSql) {
$joinTypes = array('join'=>1, 'cross'=>1, 'inner'=>1, 'straight'=>1, 'left'=>1, 'natural'=>1, 'right'=>1);
$this->sql = 'SELECT '.$arSql[0].' ';
if(!empty($this->qryParams)) $this->sql .= $this->sqlParams.' ';
if(empty($arSql[1]) && empty($this->qryFields)) $this->sql .= $this->table.'.'.$this->id;
else {
if(!empty($arSql[1])) $this->sql .= $arSql[1];
if(!empty($this->qryFields)) $this->sql .= ((empty($arSql[1])) ? '' : ',') . $this->qryFields;
}
$this->sql .= ' FROM ';
$isJoin = ($tblAr=explode(' ',trim($this->qryTables))) && ($joinTypes[strtolower($tblAr[0])]);
if(empty($arSql[2]) && empty($this->qryTables)) $this->sql .= $this->table;
else {
if(!empty($arSql[2])) $this->sql .= $arSql[2];
if(!empty($this->qryTables)) {
if(!empty($arSql[2])) $this->sql .= (($isJoin)?' ':',');
elseif($isJoin) $this->sql .= $this->table.' ';
$this->sql .= $this->qryTables;
}
}
if((!empty($arSql[3])) || (!empty($this->qryWhere))) {
$this->sql .= ' WHERE ' . $arSql[3] . ' ';
if(!empty($this->qryWhere)) $this->sql .= (empty($arSql[3])) ? $this->qryWhere : 'AND('.$this->qryWhere.')';
}
if((!empty($arSql[4])) || (!empty($this->qryGroupBy))) {
$this->sql .= ' GROUP BY ' . $arSql[4] . ' ';
if(!empty($this->qryGroupBy)) $this->sql .= (empty($arSql[4])) ? $this->qryGroupBy : ','.$this->qryGroupBy;
}
if((!empty($arSql[5])) || (!empty($this->qryHaving))) {
$this->sql .= ' HAVING ' . $arSql[5] . ' ';
if(!empty($this->qryHaving)) $this->sql .= (empty($arSql[5])) ? $this->qryHaving : 'AND('.$this->qryHaving.')';
}
if((!empty($arSql[6])) || (!empty($this->qryOrderBy))) {
$this->sql .= ' ORDER BY ' . $arSql[6] . ' ';
if(!empty($this->qryOrderBy)) $this->sql .= (empty($arSql[6])) ? $this->qryOrderBy : ','.$this->qryOrderBy;
}
if(!empty($arSql[7])) $this->sql .= ' LIMIT '.$arSql[7];
elseif(!empty($this->qryLimit)) $this->sql .= ' LIMIT '.$this->qryLimit;
if($this->sqlNeedReset) $this->sqlReset();
return $this->sql;
}
//************************************************************************
}
?>
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