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<?php
/**
* @package Joomla.Platform
* @subpackage Database
*
* @copyright Copyright (C) 2005 - 2014 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Joomla Platform Database Importer Class
*
* @package Joomla.Platform
* @subpackage Database
* @since 12.1
*/
abstract class JDatabaseImporter
{
/**
* @var array An array of cached data.
* @since 13.1
*/
protected $cache = array();
/**
* The database connector to use for exporting structure and/or data.
*
* @var JDatabaseDriver
* @since 13.1
*/
protected $db = null;
/**
* The input source.
*
* @var mixed
* @since 13.1
*/
protected $from = array();
/**
* The type of input format (XML).
*
* @var string
* @since 13.1
*/
protected $asFormat = 'xml';
/**
* An array of options for the exporter.
*
* @var object
* @since 13.1
*/
protected $options = null;
/**
* Constructor.
*
* Sets up the default options for the exporter.
*
* @since 13.1
*/
public function __construct()
{
$this->options = new stdClass;
$this->cache = array('columns' => array(), 'keys' => array());
// Set up the class defaults:
// Import with only structure
$this->withStructure();
// Export as XML.
$this->asXml();
// Default destination is a string using $output = (string) $exporter;
}
/**
* Set the output option for the exporter to XML format.
*
* @return JDatabaseImporter Method supports chaining.
*
* @since 13.1
*/
public function asXml()
{
$this->asFormat = 'xml';
return $this;
}
/**
* Checks if all data and options are in order prior to exporting.
*
* @return JDatabaseImporter Method supports chaining.
*
* @since 13.1
* @throws Exception if an error is encountered.
*/
abstract public function check();
/**
* Specifies the data source to import.
*
* @param mixed $from The data source to import.
*
* @return JDatabaseImporter Method supports chaining.
*
* @since 13.1
*/
public function from($from)
{
$this->from = $from;
return $this;
}
/**
* Get the SQL syntax to drop a column.
*
* @param string $table The table name.
* @param string $name The name of the field to drop.
*
* @return string
*
* @since 13.1
*/
protected function getDropColumnSQL($table, $name)
{
return 'ALTER TABLE ' . $this->db->quoteName($table) . ' DROP COLUMN ' . $this->db->quoteName($name);
}
/**
* Get the real name of the table, converting the prefix wildcard string if present.
*
* @param string $table The name of the table.
*
* @return string The real name of the table.
*
* @since 13.1
*/
protected function getRealTableName($table)
{
$prefix = $this->db->getPrefix();
// Replace the magic prefix if found.
$table = preg_replace('|^#__|', $prefix, $table);
return $table;
}
/**
* Merges the incoming structure definition with the existing structure.
*
* @return void
*
* @note Currently only supports XML format.
* @since 13.1
* @throws RuntimeException on error.
*/
protected function mergeStructure()
{
$prefix = $this->db->getPrefix();
$tables = $this->db->getTableList();
if ($this->from instanceof SimpleXMLElement)
{
$xml = $this->from;
}
else
{
$xml = new SimpleXMLElement($this->from);
}
// Get all the table definitions.
$xmlTables = $xml->xpath('database/table_structure');
foreach ($xmlTables as $table)
{
// Convert the magic prefix into the real table name.
$tableName = (string) $table['name'];
$tableName = preg_replace('|^#__|', $prefix, $tableName);
if (in_array($tableName, $tables))
{
// The table already exists. Now check if there is any difference.
if ($queries = $this->getAlterTableSQL($xml->database->table_structure))
{
// Run the queries to upgrade the data structure.
foreach ($queries as $query)
{
$this->db->setQuery((string) $query);
try
{
$this->db->execute();
}
catch (RuntimeException $e)
{
$this->addLog('Fail: ' . $this->db->getQuery());
throw $e;
}
$this->addLog('Pass: ' . $this->db->getQuery());
}
}
}
else
{
// This is a new table.
$sql = $this->xmlToCreate($table);
$this->db->setQuery((string) $sql);
try
{
$this->db->execute();
}
catch (RuntimeException $e)
{
$this->addLog('Fail: ' . $this->db->getQuery());
throw $e;
}
$this->addLog('Pass: ' . $this->db->getQuery());
}
}
}
/**
* Sets the database connector to use for exporting structure and/or data.
*
* @param JDatabaseDriver $db The database connector.
*
* @return JDatabaseImporter Method supports chaining.
*
* @since 13.1
*/
public function setDbo(JDatabaseDriver $db)
{
$this->db = $db;
return $this;
}
/**
* Sets an internal option to merge the structure based on the input data.
*
* @param boolean $setting True to export the structure, false to not.
*
* @return JDatabaseImporter Method supports chaining.
*
* @since 13.1
*/
public function withStructure($setting = true)
{
$this->options->withStructure = (boolean) $setting;
return $this;
}
}