<?php namespace CodeIgniter\Database;
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014-2018 British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author CodeIgniter Dev Team
* @copyright 2014-2018 British Columbia Institute of Technology (https://bcit.ca/)
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
use CodeIgniter\Database\Exceptions\DatabaseException;
/**
* Class BaseUtils
*/
abstract class BaseUtils
{
/**
* Database object
*
* @var object
*/
protected $db;
//--------------------------------------------------------------------
/**
* List databases statement
*
* @var string
*/
protected $listDatabases = false;
/**
* OPTIMIZE TABLE statement
*
* @var string
*/
protected $optimizeTable = false;
/**
* REPAIR TABLE statement
*
* @var string
*/
protected $repairTable = false;
//--------------------------------------------------------------------
/**
* Class constructor
*
* @param ConnectionInterface|object $db
*/
public function __construct(ConnectionInterface &$db)
{
$this->db = & $db;
}
//--------------------------------------------------------------------
/**
* List databases
*
* @return array|boolean
* @throws \CodeIgniter\Database\Exceptions\DatabaseException
*/
public function listDatabases()
{
// Is there a cached result?
if (isset($this->db->dataCache['db_names']))
{
return $this->db->dataCache['db_names'];
}
elseif ($this->listDatabases === false)
{
if ($this->db->DBDebug)
{
throw new DatabaseException('Unsupported feature of the database platform you are using.');
}
return false;
}
$this->db->dataCache['db_names'] = [];
$query = $this->db->query($this->listDatabases);
if ($query === false)
{
return $this->db->dataCache['db_names'];
}
for ($i = 0, $query = $query->getResultArray(), $c = count($query); $i < $c; $i ++)
{
$this->db->dataCache['db_names'][] = current($query[$i]);
}
return $this->db->dataCache['db_names'];
}
//--------------------------------------------------------------------
/**
* Determine if a particular database exists
*
* @param string $database_name
* @return boolean
*/
public function databaseExists($database_name)
{
return in_array($database_name, $this->listDatabases());
}
//--------------------------------------------------------------------
/**
* Optimize Table
*
* @param string $table_name
* @return boolean|mixed
* @throws \CodeIgniter\Database\Exceptions\DatabaseException
*/
public function optimizeTable($table_name)
{
if ($this->optimizeTable === false)
{
if ($this->db->DBDebug)
{
throw new DatabaseException('Unsupported feature of the database platform you are using.');
}
return false;
}
$query = $this->db->query(sprintf($this->optimizeTable, $this->db->escapeIdentifiers($table_name)));
if ($query !== false)
{
$query = $query->getResultArray();
return current($query);
}
return false;
}
//--------------------------------------------------------------------
/**
* Optimize Database
*
* @return mixed
* @throws \CodeIgniter\Database\Exceptions\DatabaseException
*/
public function optimizeDatabase()
{
if ($this->optimizeTable === false)
{
if ($this->db->DBDebug)
{
throw new DatabaseException('Unsupported feature of the database platform you are using.');
}
return false;
}
$result = [];
foreach ($this->db->listTables() as $table_name)
{
$res = $this->db->query(sprintf($this->optimizeTable, $this->db->escapeIdentifiers($table_name)));
if (is_bool($res))
{
return $res;
}
// Build the result array...
$res = $res->getResultArray();
$res = current($res);
$key = str_replace($this->db->database . '.', '', current($res));
$keys = array_keys($res);
unset($res[$keys[0]]);
$result[$key] = $res;
}
return $result;
}
//--------------------------------------------------------------------
/**
* Repair Table
*
* @param string $table_name
* @return mixed
* @throws \CodeIgniter\Database\Exceptions\DatabaseException
*/
public function repairTable($table_name)
{
if ($this->repairTable === false)
{
if ($this->db->DBDebug)
{
throw new DatabaseException('Unsupported feature of the database platform you are using.');
}
return false;
}
$query = $this->db->query(sprintf($this->repairTable, $this->db->escapeIdentifiers($table_name)));
if (is_bool($query))
{
return $query;
}
$query = $query->getResultArray();
return current($query);
}
//--------------------------------------------------------------------
/**
* Generate CSV from a query result object
*
* @param ResultInterface $query Query result object
* @param string $delim Delimiter (default: ,)
* @param string $newline Newline character (default: \n)
* @param string $enclosure Enclosure (default: ")
*
* @return string
*/
public function getCSVFromResult(ResultInterface $query, $delim = ',', $newline = "\n", $enclosure = '"')
{
$out = '';
// First generate the headings from the table column names
foreach ($query->getFieldNames() as $name)
{
$out .= $enclosure . str_replace($enclosure, $enclosure . $enclosure, $name) . $enclosure . $delim;
}
$out = substr($out, 0, -strlen($delim)) . $newline;
// Next blast through the result array and build out the rows
while ($row = $query->getUnbufferedRow('array'))
{
$line = [];
foreach ($row as $item)
{
$line[] = $enclosure . str_replace($enclosure, $enclosure . $enclosure, $item) . $enclosure;
}
$out .= implode($delim, $line) . $newline;
}
return $out;
}
//--------------------------------------------------------------------
/**
* Generate XML data from a query result object
*
* @param ResultInterface $query Query result object
* @param array $params Any preferences
*
* @return string
*/
public function getXMLFromResult(ResultInterface $query, $params = [])
{
// Set our default values
foreach (['root' => 'root', 'element' => 'element', 'newline' => "\n", 'tab' => "\t"] as $key => $val)
{
if (! isset($params[$key]))
{
$params[$key] = $val;
}
}
// Create variables for convenience
extract($params);
// Load the xml helper
helper('xml');
// Generate the result
$xml = '<' . $root . '>' . $newline;
while ($row = $query->getUnbufferedRow())
{
$xml .= $tab . '<' . $element . '>' . $newline;
foreach ($row as $key => $val)
{
$xml .= $tab . $tab . '<' . $key . '>' . xml_convert($val) . '</' . $key . '>' . $newline;
}
$xml .= $tab . '</' . $element . '>' . $newline;
}
return $xml . '</' . $root . '>' . $newline;
}
//--------------------------------------------------------------------
/**
* Database Backup
*
* @param array $params
* @return mixed
* @throws \CodeIgniter\Database\Exceptions\DatabaseException
*/
public function backup($params = [])
{
// If the parameters have not been submitted as an
// array then we know that it is simply the table
// name, which is a valid short cut.
if (is_string($params))
{
$params = ['tables' => $params];
}
// Set up our default preferences
$prefs = [
'tables' => [],
'ignore' => [],
'filename' => '',
'format' => 'gzip', // gzip, zip, txt
'add_drop' => true,
'add_insert' => true,
'newline' => "\n",
'foreign_key_checks' => true,
];
// Did the user submit any preferences? If so set them....
if (! empty($params))
{
foreach ($prefs as $key => $val)
{
if (isset($params[$key]))
{
$prefs[$key] = $params[$key];
}
}
}
// Are we backing up a complete database or individual tables?
// If no table names were submitted we'll fetch the entire table list
if (empty($prefs['tables']))
{
$prefs['tables'] = $this->db->listTables();
}
// Validate the format
if (! in_array($prefs['format'], ['gzip', 'zip', 'txt'], true))
{
$prefs['format'] = 'txt';
}
// Is the encoder supported? If not, we'll either issue an
// error or use plain text depending on the debug settings
if (($prefs['format'] === 'gzip' && ! function_exists('gzencode'))
|| ( $prefs['format'] === 'zip' && ! function_exists('gzcompress')))
{
if ($this->db->DBDebug)
{
throw new DatabaseException('The file compression format you chose is not supported by your server.');
}
$prefs['format'] = 'txt';
}
// Was a Zip file requested?
if ($prefs['format'] === 'zip')
{
// Set the filename if not provided (only needed with Zip files)
if ($prefs['filename'] === '')
{
$prefs['filename'] = (count($prefs['tables']) === 1 ? $prefs['tables'] : $this->db->database)
. date('Y-m-d_H-i', time()) . '.sql';
}
else
{
// If they included the .zip file extension we'll remove it
if (preg_match('|.+?\.zip$|', $prefs['filename']))
{
$prefs['filename'] = str_replace('.zip', '', $prefs['filename']);
}
// Tack on the ".sql" file extension if needed
if (! preg_match('|.+?\.sql$|', $prefs['filename']))
{
$prefs['filename'] .= '.sql';
}
}
// Load the Zip class and output it
// $CI =& get_instance();
// $CI->load->library('zip');
// $CI->zip->add_data($prefs['filename'], $this->_backup($prefs));
// return $CI->zip->get_zip();
}
elseif ($prefs['format'] === 'txt') // Was a text file requested?
{
return $this->_backup($prefs);
}
elseif ($prefs['format'] === 'gzip') // Was a Gzip file requested?
{
return gzencode($this->_backup($prefs));
}
return;
}
//--------------------------------------------------------------------
/**
* Platform dependent version of the backup function.
*
* @param array|null $prefs
*
* @return mixed
*/
abstract public function _backup(array $prefs = null);
//--------------------------------------------------------------------
}
Jim Parry