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Filename : DBsimple.php
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<?php
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Wolfram Kriesing <wolfram@kriesing.de>                      |
// +----------------------------------------------------------------------+

// $Id: DBsimple.php 320703 2011-12-08 22:08:40Z danielc $
require_once 'Tree/OptionsDB.php';
require_once 'Tree/Error.php';

/**
 * the DB interface to the tree class
 *
 * @access public
 * @author Wolfram Kriesing <wolfram@kriesing.de>
 * @version 2001/06/27
 * @package Tree
 */
class Tree_Memory_DBsimple extends Tree_OptionsDB
{
    // FIXXME should actually extend Tree_Common, to use the methods provided in there...
    // but we need to connect to the db here, so we extend optionsMDB for now, may be use
    // "aggregate" function to fix that

    /**
     * @access public
     * @var array saves the options passed to the constructor. Valid options:
     *      - order: which column to order by when reading the data from the DB,
     *               this sorts the data even inside every level
     *      - whereAddOn: add on for the where clause, this string is simply
     *                    added behind the WHERE in the select, so you better make
     *                    sure its correct SQL :-), i.e. 'uid=3'.
     *                    This is needed i.e. when you are saving many trees for different
     *                    user in one table where each entry has a uid (user id)
     *      - columnNameMaps: the column-name maps are used for the "as" in the select
     *                        queries so you can use any column name in the table and "map"
     *                        it to the name that shall be used in the internal array,
     *                        that is built, see the examples (in comments)
     *      - columnNameMaps: array for id/parentId/prevId/name table column names
     */
    var $options = array('order' => '',
                         'whereAddOn' => '',
                         'table' => '',
                         'columnNameMaps' => array(
                                   /* 'id'       => 'tree_id', // use "tree_id" as "id"
                                      'parentId' => 'parent_id',
                                      'prevId'   => 'previous_id',
                                      'name'     => 'nodeName'
                                   */
                        ),
                    );

    /**
     *
     * @access public
     * @var string the table where to read the tree data from
     *                    can also be set using the DSN in the constructor
     */
    var $table;

    /**
     *
     * @access private
     * @var object $dbh    the handle to the DB-object
     */
    // var $dbh;

    // {{{ Tree_Memory_DBsimple()

    /**
     * set up this object
     *
     * @version 2001/06/27
     * @access public
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     * @param string $dsn this is a DSN of the for that PEAR::DB uses it
     *                                only that additionally you can add parameters like ...?table=test_table
     *                                to define the table it shall work on
     * @param array $options additional options you can set
     */
    function Tree_Memory_DBsimple($dsn, $options = array())
    {
        $this->Tree_OptionsDB($dsn, $options); // instanciate DB
        if (is_string($options)) {
            // just to be backward compatible, or to make the second paramter shorter
            $this->setOption('order', $options);
        }

        $this->table = $this->getOption('table');
    }

    // }}}
    // {{{ setup()

    /**
     * retreive all the navigation data from the db and call build to build the
     * tree in the array data and structure
     *
     * @version 2001/11/20
     * @access public
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     * @return boolean true on success
     */
    function setup()
    {
        // TODO sort by prevId (parentId,prevId $addQuery) too if it exists in the table, or the root might be wrong
        // TODO  since the prevId of the root should be 0

        $whereAddOn = '';
        if ($this->options['whereAddOn']) {
            $whereAddOn = 'WHERE ' . $this->getOption('whereAddOn');
        }

        $orderBy = '';
        if ($this->options['order']) {
            $orderBy = ',' . $this->options['order'];
        }

        $map = $this->getOption('columnNameMaps');
        if (isset($map['parentId'])) {
            $orderBy = $map['parentId'] . $orderBy;
        } else {
            $orderBy = 'parentId' . $orderBy;
        }
        // build the query this way, that the root, which has no parent (parentId=0)
        // and no previous (prevId=0) is in first place (in case prevId is given)
        $query = sprintf("SELECT * FROM %s %s ORDER BY %s",
            $this->table,
            $whereAddOn,
            $orderBy); //,prevId !!!!
        if (DB::isError($res = $this->dbh->getAll($query))) {
            // FIXXME remove print use debug mode instead
            printf("ERROR - Tree::setup - %s - %s<br>", DB::errormessage($res), $query);
            return $this->_throwError($res->getMessage(), __LINE__);
        }
        // if the db-column names need to be mapped to different names
        // FIXXME somehow we should be able to do this in the query, but i dont know how to select
        // only those columns, use "as" on them and select the rest, without getting those columns again :-(
        if ($map) {
            foreach($res as $id => $aResult) { // map each result
                foreach($map as $key => $columnName) {
                    $res[$id][$key] = $res[$id][$columnName];
                    unset($res[$id][$columnName]);
                }
            }
        }

        return $res;
    }

    // }}}
    // {{{ add()

    /**
     * adds _one_ new element in the tree under the given parent
     * the values' keys given have to match the db-columns, because the
     * value gets inserted in the db directly
     * to add an entire node containing children and so on see 'addNode()'
     *
     * to ba compatible, to the DBnested u can also give the parent and previd as the second and third parameter
     *
     * @see addNode
     * @version 2001/10/09
     * @access public
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     * @param array $newValues this array contains the values that shall be inserted in the db-table
     *                                    the key for each element is the name of the column
     * @return mixed either boolean false on failure or the id of the inserted row
     */
    function add($newValues, $parentId = 0)
    {
        // FIXXME use $this->dbh->tableInfo to check which columns exist
        // so only data for which a column exist is inserted
        if ($parentId) {
            $newValues['parentId'] = $parentId;
        }
        $newData = array();
        foreach($newValues as $key => $value) { // quote the values, as needed for the insert
            $newData[$this->_getColName($key)] = $this->dbh->quote($value);
        }
        // use sequences to create a new id in the db-table
        $nextId = $this->dbh->nextId($this->table);
        $query = sprintf("INSERT INTO %s (%s,%s) VALUES (%s,%s)",
                         $this->table ,
                         $this->_getColName('id'),
                         implode(',', array_keys($newData)) ,
                         $nextId,
                         implode(',', $newData));
        if (DB::isError($res = $this->dbh->query($query))) {
            // TODO raise PEAR error
            printf("ERROR - Tree::add - %s - %s<br>", DB::errormessage($res), $query);
            return false;
        }

        return $nextId;
    }

    // }}}
    // {{{ remove()

    /**
     * removes the given node
     *
     * @version 2001/10/09
     * @access public
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     * @param mixed $id the id of the node to be removed, or an array of id's to be removed
     * @return boolean true on success
     */
    function remove($id)
    {
        // if the one to remove has children, get their id's to remove them too
        if ($this->hasChildren($id)) {
            $id = $this->walk(array('_remove', $this), $id, 'array');
        }
        $idColumnName = 'id';
        $map = $this->getOption('columnNameMaps');
        if (isset($map['id'])) { // if there are maps given
            $idColumnName = $map['id'];
        }

        $whereClause = "WHERE $idColumnName=$id";
        if (is_array($id)) {
            $whereClause = "WHERE $idColumnName in (" . implode(',', $id) . ')';
        }

        $query = "DELETE FROM {$this->table} $whereClause";
        // print("<br>".$query);
        if (DB::isError($res = $this->dbh->query($query))) {
            // TODO raise PEAR error
            printf("ERROR - Tree::remove - %s - %s<br>", DB::errormessage($res), $query);
            return false;
        }
        // TODO if remove succeeded set prevId of the following element properly
        return true;
    }

    // }}}
    // {{{ move()

    /**
     * move an entry under a given parent or behind a given entry
     *
     * @version 2001/10/10
     * @access public
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     * @param integer $idToMove the id of the element that shall be moved
     * @param integer $newParentId the id of the element which will be the new parent
     * @param integer $newPrevId if prevId is given the element with the id idToMove
     *                                        shall be moved _behind_ the element with id=prevId
     *                                        if it is 0 it will be put at the beginning
     *                                        if no prevId is in the DB it can be 0 too and won't bother
     *                                        since it is not written in the DB anyway
     * @return boolean true for success
     */
    function move($idToMove, $newParentId, $newPrevId = 0)
    {
        $idColumnName = 'id';
        $parentIdColumnName = 'parentId';
        $map = $this->getOption('columnNameMaps');
        if (isset($map['id'])) {
            $idColumnName = $map['id'];
        }
        if (isset($map['parentId'])) {
            $parentIdColumnName = $map['parentId'];
        }
        // FIXXME todo: previous stuff
        // set the parent in the DB
        $query = "UPDATE $this->table SET $parentIdColumnName=$newParentId WHERE $idColumnName=$idToMove";
        // print($query);
        if (DB::isError($res = $this->dbh->query($query))) {
            // TODO raise PEAR error
            printf("ERROR - Tree::move - %s - %s<br>", DB::errormessage($res), $query);
            return false;
        }
        // FIXXME update the prevId's of the elements where the element was moved away from and moved in
        return true;
    }

    // }}}
    // {{{ update()

    /**
     * update an element in the DB
     *
     * @version 2002/01/17
     * @access public
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     * @param array $newData all the new data, the key 'id' is used to
     *                                    build the 'WHERE id=' clause and all the other
     *                                    elements are the data to fill in the DB
     * @return boolean true for success
     */
    function update($id, $newData)
    {
        // FIXXME check $this->dbh->tableInfo to see if all the columns that shall be updated
        // really exist, this will also extract nextId etc. if given before writing it in the DB
        // in case they dont exist in the DB
        $setData = array();
        foreach($newData as $key => $value) { // quote the values, as needed for the insert
            $setData[] = $this->_getColName($key) . '=' . $this->dbh->quote($value);
        }

        $query = sprintf('UPDATE %s SET %s WHERE %s=%s',
                         $this->table,
                         implode(',', $setData),
                         $this->_getColName('id'),
                         $id
                         );
        if (DB::isError($res = $this->dbh->query($query))) {
            // FIXXME raise PEAR error
            printf("ERROR - Tree::update - %s - %s<br>", DB::errormessage($res), $query);
            return false;
        }

        return true;
    }

    // }}}
    // {{{ _throwError()

    /**
     *
     * @access private
     * @version 2002/03/02
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     */
    function _throwError($msg, $line, $mode = null)
    {
        return new Tree_Error($msg, $line, __FILE__, $mode, $this->db->last_query);
    }

    // }}}
    // {{{ _prepareResults()

    /**
     * prepare multiple results
     *
     * @see _prepareResult
     * @access private
     * @version 2002/03/03
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     */
    function _prepareResults($results)
    {
        $newResults = array();
        foreach($results as $aResult)
        $newResults[] = $this->_prepareResult($aResult);
        return $newResults;
    }

    // }}}
    // {{{ _prepareResult()

    /**
     * map back the index names to get what is expected
     *
     * @access private
     * @version 2002/03/03
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     */
    function _prepareResult($result)
    {
        $map = $this->getOption('columnNameMaps');

        if ($map) {
            foreach($map as $key => $columnName) {
                $result[$key] = $result[$columnName];
                unset($result[$columnName]);
            }
        }
        return $result;
    }

    // }}}
    // {{{ _getColName()

    /**
     * this method retreives the real column name, as used in the DB
     *    since the internal names are fixed, to be portable between different
     *    DB-column namings, we map the internal name to the real column name here
     *
     * @access private
     * @version 2002/03/02
     * @author Wolfram Kriesing <wolfram@kriesing.de>
     */
    function _getColName($internalName)
    {
        if ($map = $this->getOption('columnNameMaps')) {
            if (isset($map[$internalName])) {
                return $map[$internalName];
            }
        }
        return $internalName;
    }

    // }}}
}