Cricao de Sites - 650 Layouts Prontos/WebMasters.iso/Servidores/xampp-win32-1.6.7-installer.exe/php/PEAR/DB/QueryTool/EasyJoin.php

PHP Script | 2008-07-02 | 6.5 KB | 154 lines

<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * Contains the DB_QueryTool_EasyJoin class
 *
 * PHP versions 4 and 5
 *
 * LICENSE: Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category  Database
 * @package   DB_QueryTool
 * @author    Wolfram Kriesing <[e-mail]>
 * @author    Paolo Panto <[e-mail]>
 * @copyright 2003-2007 Wolfram Kriesing, Paolo Panto
 * @license   http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
 * @version   CVS: $Id: EasyJoin.php,v 1.11 2007/11/16 20:33:49 quipo Exp $
 * @link      http://pear.php.net/package/DB_QueryTool
 */

/**
 * require the DB_QueryTool_Query class
 */
require_once 'DB/QueryTool/Query.php';

/**
 * DB_QueryTool_EasyJoin class
 *
 * @category  Database
 * @package   DB_QueryTool
 * @author    Wolfram Kriesing <[e-mail]>
 * @copyright 2003-2007 Wolfram Kriesing
 * @license   http://www.debian.org/misc/bsd.license  BSD License (3 Clause)
 * @link      http://pear.php.net/package/DB_QueryTool
 */
class DB_QueryTool_EasyJoin extends DB_QueryTool_Query
{
    // {{{ class vars

    /**
     * This is the regular expression that shall be used to find a table's shortName
     * in a column name, the string found by using this regular expression will be removed
     * from the column name and it will be checked if it is a table name
     * i.e. the default '/_id$/' would find the table name 'user' from the column name 'user_id'
     *
     * @var string regexp
     */
    var $_tableNamePreg = '/_id$/';

    /**
     * This is to find the column name that is referred by it, so the default find
     * from 'user_id' the column 'id' which will be used to refer to the 'user' table
     *
     * @var string regexp
     */
    var $_columnNamePreg = '/^.*_/';

    // }}}
    // {{{ __construct()

    /**
     * call parent constructor
     *
     * @param mixed $dsn     DSN string, DSN array or DB object
     * @param array $options database options
     */
    function __construct($dsn = false, $options = array())
    {
        parent::DB_QueryTool_Query($dsn, $options);
    }

    // }}}
    // {{{ autoJoin()

    /**
     * Join the given tables, using the column names, to find out how to join the tables;
     * i.e., if table1 has a column named "table2_id", this method will join
     * "WHERE table1.table2_id=table2.id".
     * All joins made here are only concatenated via AND.
     *
     * @param array $tables tables to join
     *
     * @return void
     */
    function autoJoin($tables)
    {
        // FIXXME if $tables is empty autoJoin all available tables that have a relation
        // to $this->table, starting to search in $this->table
        settype($tables, 'array');
        // add this->table to the tables array, so we go thru the current table first
        $tables = array_merge(array($this->table), $tables);

        $shortNameIndexed = $this->getTableSpec(true, $tables);
        $nameIndexed      = $this->getTableSpec(false, $tables);

        //print_r($shortNameIndexed);
        //print_r($tables);        print '<br><br>';
        if (sizeof($shortNameIndexed) != sizeof($tables)) {
            $this->_errorLog("autoJoin-ERROR: not all the tables are in the tableSpec!<br />");
        }

        $joinTables     = array();
        $joinConditions = array();
        foreach ($tables as $aTable) {   // go through $this->table and all the given tables
            if ($metadata = $this->metadata($aTable))
            foreach ($metadata as $aCol => $x) {   // go through each row to check which might be related to $aTable
                $possibleTableShortName = preg_replace($this->_tableNamePreg, '', $aCol);
                $possibleColumnName     = preg_replace($this->_columnNamePreg, '', $aCol);
                //print "$aTable.$aCol .... possibleTableShortName=$possibleTableShortName .... possibleColumnName=$possibleColumnName<br />";
                if (isset($shortNameIndexed[$possibleTableShortName])) {
                    // are the tables given in the tableSpec?
                    if (!$shortNameIndexed[$possibleTableShortName]['name'] ||
                        !$nameIndexed[$aTable]['name']) {
                        // its an error of the developer, so log the error, dont show it to the end user
                        $this->_errorLog("autoJoin-ERROR: '$aTable' is not given in the tableSpec!<br />");
                    } else {
                        // do only join different table.col combination,
                        // we should not join stuff like 'question.question=question.question'
                        // this would be quite stupid, but it used to be :-(
                        if ($shortNameIndexed[$possibleTableShortName]['name'] != $aTable ||
                            $possibleColumnName != $aCol
                        ) {
                            $where = $shortNameIndexed[$possibleTableShortName]['name'].".$possibleColumnName=$aTable.$aCol";
                            $this->addJoin($nameIndexed[$aTable]['name'], $where);
                            $this->addJoin($shortNameIndexed[$possibleTableShortName]['name'], $where);
                        }
                    }
                }
            }
        }
    }

    // }}}
}
?>