common.php

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<?php
// +----------------------------------------------------------------------+
// | PHP versions 4 and 5                                                 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2007 Manuel Lemos, Tomas V.V.Cox,                 |
// | Stig. S. Bakken, Lukas Smith                                         |
// | All rights reserved.                                                 |
// +----------------------------------------------------------------------+
// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB  |
// | API as well as database abstraction for PHP applications.            |
// | This LICENSE is in the BSD license style.                            |
// |                                                                      |
// | Redistribution and use in source and binary forms, with or without   |
// | modification, are permitted provided that the following conditions   |
// | are met:                                                             |
// |                                                                      |
// | Redistributions of source code must retain the above copyright       |
// | notice, this list of conditions and the following disclaimer.        |
// |                                                                      |
// | 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. |
// |                                                                      |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken,    |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission.                                                  |
// |                                                                      |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
// | "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      |
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// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
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// | 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.                                          |
// +----------------------------------------------------------------------+
// | Author: Lukas Smith <[e-mail]>                           |
// +----------------------------------------------------------------------+
//
// $Id: Common.php,v 1.68 2007/12/03 20:59:15 quipo Exp $
//

/**
 * @package  MDB2
 * @category Database
 * @author   Lukas Smith <[e-mail]>
 */

/**
 * Base class for the management modules that is extended by each MDB2 driver
 *
 * To load this module in the MDB2 object:
 * $mdb->loadModule('Manager');
 *
 * @package MDB2
 * @category Database
 * @author  Lukas Smith <[e-mail]>
 */
class MDB2_Driver_Manager_Common extends MDB2_Module_Common
{
    // {{{ splitTableSchema()

    /**
     * Split the "[owner|schema].table" notation into an array
     * @access private
     */
    function splitTableSchema($table)
    {
        $ret = array();
        if (strpos($table, '.') !== false) {
            return explode('.', $table);
        }
        return array(null, $table);
    }

    // }}}
    // {{{ getFieldDeclarationList()

    /**
     * Get declaration of a number of field in bulk
     *
     * @param array $fields  a multidimensional associative array.
     *      The first dimension determines the field name, while the second
     *      dimension is keyed with the name of the properties
     *      of the field being declared as array indexes. Currently, the types
     *      of supported field properties are as follows:
     *
     *      default
     *          Boolean value to be used as default for this field.
     *
     *      notnull
     *          Boolean flag that indicates whether this field is constrained
     *          to not be set to null.
     *
     * @return mixed string on success, a MDB2 error on failure
     * @access public
     */
    function getFieldDeclarationList($fields)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        if (!is_array($fields) || empty($fields)) {
            return $db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
                'missing any fields', __FUNCTION__);
        }
        foreach ($fields as $field_name => $field) {
            $query = $db->getDeclaration($field['type'], $field_name, $field);
            if (PEAR::isError($query)) {
                return $query;
            }
            $query_fields[] = $query;
        }
        return implode(', ', $query_fields);
    }

    // }}}
    // {{{ _fixSequenceName()

    /**
     * Removes any formatting in an sequence name using the 'seqname_format' option
     *
     * @param string $sqn string that containts name of a potential sequence
     * @param bool $check if only formatted sequences should be returned
     * @return string name of the sequence with possible formatting removed
     * @access protected
     */
    function _fixSequenceName($sqn, $check = false)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        $seq_pattern = '/^'.preg_replace('/%s/', '([a-z0-9_]+)', $db->options['seqname_format']).'$/i';
        $seq_name = preg_replace($seq_pattern, '\\1', $sqn);
        if ($seq_name && !strcasecmp($sqn, $db->getSequenceName($seq_name))) {
            return $seq_name;
        }
        if ($check) {
            return false;
        }
        return $sqn;
    }

    // }}}
    // {{{ _fixIndexName()

    /**
     * Removes any formatting in an index name using the 'idxname_format' option
     *
     * @param string $idx string that containts name of anl index
     * @return string name of the index with eventual formatting removed
     * @access protected
     */
    function _fixIndexName($idx)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        $idx_pattern = '/^'.preg_replace('/%s/', '([a-z0-9_]+)', $db->options['idxname_format']).'$/i';
        $idx_name = preg_replace($idx_pattern, '\\1', $idx);
        if ($idx_name && !strcasecmp($idx, $db->getIndexName($idx_name))) {
            return $idx_name;
        }
        return $idx;
    }

    // }}}
    // {{{ createDatabase()

    /**
     * create a new database
     *
     * @param string $name    name of the database that should be created
     * @param array  $options array with charset, collation info
     *
     * @return mixed MDB2_OK on success, a MDB2 error on failure
     * @access public
     */
    function createDatabase($database, $options = array())
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ dropDatabase()

    /**
     * drop an existing database
     *
     * @param string $name name of the database that should be dropped
     * @return mixed MDB2_OK on success, a MDB2 error on failure
     * @access public
     */
    function dropDatabase($database)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ _getCreateTableQuery()

    /**
     * Create a basic SQL query for a new table creation
     *
     * @param string $name    Name of the database that should be created
     * @param array  $fields  Associative array that contains the definition of each field of the new table
     * @param array  $options An associative array of table options
     *
     * @return mixed string (the SQL query) on success, a MDB2 error on failure
     * @see createTable()
     */
    function _getCreateTableQuery($name, $fields, $options = array())
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        if (!$name) {
            return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
                'no valid table name specified', __FUNCTION__);
        }
        if (empty($fields)) {
            return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
                'no fields specified for table "'.$name.'"', __FUNCTION__);
        }
        $query_fields = $this->getFieldDeclarationList($fields);
        if (PEAR::isError($query_fields)) {
            return $query_fields;
        }
        if (!empty($options['primary'])) {
            $query_fields.= ', PRIMARY KEY ('.implode(', ', array_keys($options['primary'])).')';
        }

        $name = $db->quoteIdentifier($name, true);
        $result = 'CREATE ';
        if (!empty($options['temporary'])) {
            $result .= $this->_getTemporaryTableQuery();
        }
        $result .= " TABLE $name ($query_fields)";
        return $result;
    }

    // }}}
    // {{{ _getTemporaryTableQuery()

    /**
     * A method to return the required SQL string that fits between CREATE ... TABLE
     * to create the table as a temporary table.
     *
     * Should be overridden in driver classes to return the correct string for the
     * specific database type.
     *
     * The default is to return the string "TEMPORARY" - this will result in a
     * SQL error for any database that does not support temporary tables, or that
     * requires a different SQL command from "CREATE TEMPORARY TABLE".
     *
     * @return string The string required to be placed between "CREATE" and "TABLE"
     *                to generate a temporary table, if possible.
     */
    function _getTemporaryTableQuery()
    {
        return 'TEMPORARY';
    }

    // }}}
    // {{{ createTable()

    /**
     * create a new table
     *
     * @param string $name   Name of the database that should be created
     * @param array $fields  Associative array that contains the definition of each field of the new table
     *                       The indexes of the array entries are the names of the fields of the table an
     *                       the array entry values are associative arrays like those that are meant to be
     *                       passed with the field definitions to get[Type]Declaration() functions.
     *                          array(
     *                              'id' => array(
     *                                  'type' => 'integer',
     *                                  'unsigned' => 1
     *                                  'notnull' => 1
     *                                  'default' => 0
     *                              ),
     *                              'name' => array(
     *                                  'type' => 'text',
     *                                  'length' => 12
     *                              ),
     *                              'password' => array(
     *                                  'type' => 'text',