425 lines
11 KiB
PHP
425 lines
11 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2016, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* Database Utility Class
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*
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* @category Database
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/database/
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*/
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abstract class CI_DB_utility {
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/**
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* Database object
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*
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* @var object
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*/
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protected $db;
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// --------------------------------------------------------------------
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/**
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* List databases statement
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*
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* @var string
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*/
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protected $_list_databases = FALSE;
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/**
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* OPTIMIZE TABLE statement
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*
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* @var string
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*/
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protected $_optimize_table = FALSE;
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/**
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* REPAIR TABLE statement
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*
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* @var string
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*/
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protected $_repair_table = FALSE;
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// --------------------------------------------------------------------
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/**
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* Class constructor
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*
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* @param object &$db Database object
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* @return void
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*/
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public function __construct(&$db)
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{
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$this->db =& $db;
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log_message('info', 'Database Utility Class Initialized');
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}
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// --------------------------------------------------------------------
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/**
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* List databases
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*
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* @return array
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*/
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public function list_databases()
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{
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// Is there a cached result?
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if (isset($this->db->data_cache['db_names']))
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{
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return $this->db->data_cache['db_names'];
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}
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elseif ($this->_list_databases === FALSE)
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{
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return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE;
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}
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$this->db->data_cache['db_names'] = array();
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$query = $this->db->query($this->_list_databases);
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if ($query === FALSE)
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{
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return $this->db->data_cache['db_names'];
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}
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for ($i = 0, $query = $query->result_array(), $c = count($query); $i < $c; $i++)
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{
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$this->db->data_cache['db_names'][] = current($query[$i]);
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}
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return $this->db->data_cache['db_names'];
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}
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// --------------------------------------------------------------------
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/**
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* Determine if a particular database exists
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*
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* @param string $database_name
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* @return bool
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*/
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public function database_exists($database_name)
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{
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return in_array($database_name, $this->list_databases());
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}
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// --------------------------------------------------------------------
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/**
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* Optimize Table
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*
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* @param string $table_name
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* @return mixed
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*/
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public function optimize_table($table_name)
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{
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if ($this->_optimize_table === FALSE)
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{
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return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE;
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}
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$query = $this->db->query(sprintf($this->_optimize_table, $this->db->escape_identifiers($table_name)));
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if ($query !== FALSE)
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{
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$query = $query->result_array();
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return current($query);
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}
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Optimize Database
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*
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* @return mixed
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*/
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public function optimize_database()
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{
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if ($this->_optimize_table === FALSE)
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{
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return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE;
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}
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$result = array();
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foreach ($this->db->list_tables() as $table_name)
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{
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$res = $this->db->query(sprintf($this->_optimize_table, $this->db->escape_identifiers($table_name)));
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if (is_bool($res))
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{
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return $res;
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}
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// Build the result array...
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$res = $res->result_array();
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$res = current($res);
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$key = str_replace($this->db->database.'.', '', current($res));
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$keys = array_keys($res);
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unset($res[$keys[0]]);
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$result[$key] = $res;
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}
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return $result;
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}
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// --------------------------------------------------------------------
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/**
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* Repair Table
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*
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* @param string $table_name
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* @return mixed
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*/
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public function repair_table($table_name)
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{
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if ($this->_repair_table === FALSE)
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{
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return ($this->db->db_debug) ? $this->db->display_error('db_unsupported_feature') : FALSE;
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}
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$query = $this->db->query(sprintf($this->_repair_table, $this->db->escape_identifiers($table_name)));
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if (is_bool($query))
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{
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return $query;
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}
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$query = $query->result_array();
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return current($query);
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}
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// --------------------------------------------------------------------
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/**
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* Generate CSV from a query result object
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*
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* @param object $query Query result object
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* @param string $delim Delimiter (default: ,)
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* @param string $newline Newline character (default: \n)
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* @param string $enclosure Enclosure (default: ")
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* @return string
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*/
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public function csv_from_result($query, $delim = ',', $newline = "\n", $enclosure = '"')
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{
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if ( ! is_object($query) OR ! method_exists($query, 'list_fields'))
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{
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show_error('You must submit a valid result object');
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}
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$out = '';
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// First generate the headings from the table column names
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foreach ($query->list_fields() as $name)
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{
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$out .= $enclosure.str_replace($enclosure, $enclosure.$enclosure, $name).$enclosure.$delim;
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}
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$out = substr($out, 0, -strlen($delim)).$newline;
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// Next blast through the result array and build out the rows
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while ($row = $query->unbuffered_row('array'))
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{
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$line = array();
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foreach ($row as $item)
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{
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$line[] = $enclosure.str_replace($enclosure, $enclosure.$enclosure, $item).$enclosure;
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}
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$out .= implode($delim, $line).$newline;
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}
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return $out;
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}
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// --------------------------------------------------------------------
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/**
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* Generate XML data from a query result object
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*
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* @param object $query Query result object
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* @param array $params Any preferences
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* @return string
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*/
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public function xml_from_result($query, $params = array())
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{
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if ( ! is_object($query) OR ! method_exists($query, 'list_fields'))
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{
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show_error('You must submit a valid result object');
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}
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// Set our default values
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foreach (array('root' => 'root', 'element' => 'element', 'newline' => "\n", 'tab' => "\t") as $key => $val)
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{
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if ( ! isset($params[$key]))
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{
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$params[$key] = $val;
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}
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}
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// Create variables for convenience
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extract($params);
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// Load the xml helper
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get_instance()->load->helper('xml');
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// Generate the result
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$xml = '<'.$root.'>'.$newline;
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while ($row = $query->unbuffered_row())
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{
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$xml .= $tab.'<'.$element.'>'.$newline;
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foreach ($row as $key => $val)
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{
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$xml .= $tab.$tab.'<'.$key.'>'.xml_convert($val).'</'.$key.'>'.$newline;
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}
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$xml .= $tab.'</'.$element.'>'.$newline;
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}
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return $xml.'</'.$root.'>'.$newline;
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}
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// --------------------------------------------------------------------
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/**
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* Database Backup
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*
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* @param array $params
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* @return string
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*/
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public function backup($params = array())
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{
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// If the parameters have not been submitted as an
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// array then we know that it is simply the table
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// name, which is a valid short cut.
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if (is_string($params))
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{
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$params = array('tables' => $params);
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}
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// Set up our default preferences
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$prefs = array(
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'tables' => array(),
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'ignore' => array(),
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'filename' => '',
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'format' => 'gzip', // gzip, zip, txt
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'add_drop' => TRUE,
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'add_insert' => TRUE,
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'newline' => "\n",
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'foreign_key_checks' => TRUE
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);
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// Did the user submit any preferences? If so set them....
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if (count($params) > 0)
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{
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foreach ($prefs as $key => $val)
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{
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if (isset($params[$key]))
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{
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$prefs[$key] = $params[$key];
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}
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}
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}
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// Are we backing up a complete database or individual tables?
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// If no table names were submitted we'll fetch the entire table list
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if (count($prefs['tables']) === 0)
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{
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$prefs['tables'] = $this->db->list_tables();
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}
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// Validate the format
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if ( ! in_array($prefs['format'], array('gzip', 'zip', 'txt'), TRUE))
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{
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$prefs['format'] = 'txt';
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}
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// Is the encoder supported? If not, we'll either issue an
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// error or use plain text depending on the debug settings
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if (($prefs['format'] === 'gzip' && ! function_exists('gzencode'))
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OR ($prefs['format'] === 'zip' && ! function_exists('gzcompress')))
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{
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if ($this->db->db_debug)
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{
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return $this->db->display_error('db_unsupported_compression');
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}
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$prefs['format'] = 'txt';
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}
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// Was a Zip file requested?
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if ($prefs['format'] === 'zip')
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{
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// Set the filename if not provided (only needed with Zip files)
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if ($prefs['filename'] === '')
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{
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$prefs['filename'] = (count($prefs['tables']) === 1 ? $prefs['tables'] : $this->db->database)
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.date('Y-m-d_H-i', time()).'.sql';
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}
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else
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{
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// If they included the .zip file extension we'll remove it
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if (preg_match('|.+?\.zip$|', $prefs['filename']))
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{
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$prefs['filename'] = str_replace('.zip', '', $prefs['filename']);
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}
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// Tack on the ".sql" file extension if needed
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if ( ! preg_match('|.+?\.sql$|', $prefs['filename']))
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{
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$prefs['filename'] .= '.sql';
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}
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}
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// Load the Zip class and output it
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$CI =& get_instance();
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$CI->load->library('zip');
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$CI->zip->add_data($prefs['filename'], $this->_backup($prefs));
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return $CI->zip->get_zip();
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}
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elseif ($prefs['format'] === 'txt') // Was a text file requested?
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{
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return $this->_backup($prefs);
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}
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elseif ($prefs['format'] === 'gzip') // Was a Gzip file requested?
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{
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return gzencode($this->_backup($prefs));
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}
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return;
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}
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}
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