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<?php
/**
*
* @package db
* @copyright (c) 2011 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License v2
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
/**
* Abstract base class for database migrations
*
* Each migration consists of a set of schema and data changes to be implemented
* in a subclass. This class provides various utility methods to simplify editing
* a phpBB.
*
* @package db
*/
abstract class phpbb_db_migration
{
/** @var phpbb_config */
protected $config;
/** @var phpbb_db_driver */
protected $db;
/** @var phpbb_db_tools */
protected $db_tools;
/** @var string */
protected $table_prefix;
/** @var string */
protected $phpbb_root_path;
/** @var string */
protected $php_ext;
/** @var array Errors, if any occurred */
protected $errors;
/** @var array List of queries executed through $this->sql_query() */
protected $queries = array();
/**
* Constructor
*
* @param phpbb_config $config
* @param phpbb_db_driver $db
* @param phpbb_db_tools $db_tools
* @param string $phpbb_root_path
* @param string $php_ext
* @param string $table_prefix
*/
public function __construct(phpbb_config $config, phpbb_db_driver $db, phpbb_db_tools $db_tools, $phpbb_root_path, $php_ext, $table_prefix)
{
$this->config = $config;
$this->db = $db;
$this->db_tools = $db_tools;
$this->table_prefix = $table_prefix;
$this->phpbb_root_path = $phpbb_root_path;
$this->php_ext = $php_ext;
$this->errors = array();
}
/**
* Defines other migrations to be applied first
*
* @return array An array of migration class names
*/
static public function depends_on()
{
return array();
}
/**
* Allows you to check if the migration is effectively installed (entirely optional)
*
* This is checked when a migration is installed. If true is returned, the migration will be set as
* installed without performing the database changes.
* This function is intended to help moving to migrations from a previous database updater, where some
* migrations may have been installed already even though they are not yet listed in the migrations table.
*
* @return bool True if this migration is installed, False if this migration is not installed (checked on install)
*/
public function effectively_installed()
{
return false;
}
/**
* Updates the database schema by providing a set of change instructions
*
* @return array Array of schema changes (compatible with db_tools->perform_schema_changes())
*/
public function update_schema()
{
return array();
}
/**
* Reverts the database schema by providing a set of change instructions
*
* @return array Array of schema changes (compatible with db_tools->perform_schema_changes())
*/
public function revert_schema()
{
return array();
}
/**
* Updates data by returning a list of instructions to be executed
*
* @return array Array of data update instructions
*/
public function update_data()
{
return array();
}
/**
* Reverts data by returning a list of instructions to be executed
*
* @return array Array of data instructions that will be performed on revert
* NOTE: calls to tools (such as config.add) are automatically reverted when
* possible, so you should not attempt to revert those, this is mostly for
* otherwise unrevertable calls (custom functions for example)
*/
public function revert_data()
{
return array();
}
/**
* Wrapper for running queries to generate user feedback on updates
*
* @param string $sql SQL query to run on the database
* @return mixed Query result from db->sql_query()
*/
protected function sql_query($sql)
{
$this->queries[] = $sql;
$this->db->sql_return_on_error(true);
if ($sql === 'begin')
{
$result = $this->db->sql_transaction('begin');
}
else if ($sql === 'commit')
{
$result = $this->db->sql_transaction('commit');
}
else
{
$result = $this->db->sql_query($sql);
if ($this->db->sql_error_triggered)
{
$this->errors[] = array(
'sql' => $this->db->sql_error_sql,
'code' => $this->db->sql_error_returned,
);
}
}
$this->db->sql_return_on_error(false);
return $result;
}
/**
* Get the list of queries run
*
* @return array
*/
public function get_queries()
{
return $this->queries;
}
}
|
