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<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
namespace phpbb\db\migration;
/**
* 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.
*/
abstract class migration implements migration_interface
{
    /** @var \phpbb\config\config */
    protected $config;
    /** @var \phpbb\db\driver\driver_interface */
    protected $db;
    /** @var \phpbb\db\tools\tools_interface */
    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 $config
    * @param \phpbb\db\driver\driver_interface $db
    * @param \phpbb\db\tools\tools_interface $db_tools
    * @param string $phpbb_root_path
    * @param string $php_ext
    * @param string $table_prefix
    */
    public function __construct(\phpbb\config\config $config, \phpbb\db\driver\driver_interface $db, \phpbb\db\tools\tools_interface $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();
    }
    /**
    * {@inheritdoc}
    */
    static public function depends_on()
    {
        return array();
    }
    /**
    * {@inheritdoc}
    */
    public function effectively_installed()
    {
        return false;
    }
    /**
    * {@inheritdoc}
    */
    public function update_schema()
    {
        return array();
    }
    /**
    * {@inheritdoc}
    */
    public function revert_schema()
    {
        return array();
    }
    /**
    * {@inheritdoc}
    */
    public function update_data()
    {
        return array();
    }
    /**
    * {@inheritdoc}
    */
    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->get_sql_error_triggered())
            {
                $this->errors[] = array(
                    'sql'    => $this->db->get_sql_error_sql(),
                    'code'    => $this->db->get_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;
    }
}