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<?php
/**
* @package Joomla.Platform
* @subpackage Database
*
* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* MySQL import driver.
*
* @package Joomla.Platform
* @subpackage Database
* @since 11.1
*/
class JDatabaseImporterMySQL
{
/**
* @var array An array of cached data.
* @since 11.1
*/
protected $cache = array();
/**
* The database connector to use for exporting structure and/or data.
*
* @var JDatabaseMySQL
* @since 11.1
*/
protected $db = null;
/**
* The input source.
*
* @var mixed
* @since 11.1
*/
protected $from = array();
/**
* The type of input format (XML).
*
* @var string
* @since 11.1
*/
protected $asFormat = 'xml';
/**
* An array of options for the exporter.
*
* @var JObject
* @since 11.1
*/
protected $options = null;
/**
* Constructor.
*
* Sets up the default options for the exporter.
*
* @since 11.1
*/
public function __construct()
{
$this->options = new JObject;
$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 JDatabaseImporterMySQL Method supports chaining.
*
* @since 11.1
*/
public function asXml()
{
$this->asFormat = 'xml';
return $this;
}
/**
* Checks if all data and options are in order prior to exporting.
*
* @return JDatabaseImporterMySQL Method supports chaining.
*
* @since 11.1
* @throws Exception if an error is encountered.
*/
public function check()
{
// Check if the db connector has been set.
if (!($this->db instanceof JDatabaseMySql))
{
throw new Exception('JPLATFORM_ERROR_DATABASE_CONNECTOR_WRONG_TYPE');
}
// Check if the tables have been specified.
if (empty($this->from))
{
throw new Exception('JPLATFORM_ERROR_NO_TABLES_SPECIFIED');
}
return $this;
}
/**
* Specifies the data source to import.
*
* @param mixed $from The data source to import.
*
* @return JDatabaseImporterMySQL Method supports chaining.
*
* @since 11.1
*/
public function from($from)
{
$this->from = $from;
return $this;
}
/**
* Get the SQL syntax to add a column.
*
* @param string $table The table name.
* @param SimpleXMLElement $field The XML field definition.
*
* @return string
*
* @since 11.1
*/
protected function getAddColumnSQL($table, SimpleXMLElement $field)
{
$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' ADD COLUMN ' . $this->getColumnSQL($field);
return $sql;
}
/**
* Get the SQL syntax to add a key.
*
* @param string $table The table name.
* @param array $keys An array of the fields pertaining to this key.
*
* @return string
*
* @since 11.1
*/
protected function getAddKeySQL($table, $keys)
{
$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' ADD ' . $this->getKeySQL($keys);
return $sql;
}
/**
* Get alters for table if there is a difference.
*
* @param SimpleXMLElement $structure The XML structure pf the table.
*
* @return array
*
* @since 11.1
*/
protected function getAlterTableSQL(SimpleXMLElement $structure)
{
// Initialise variables.
$table = $this->getRealTableName($structure['name']);
$oldFields = $this->db->getTableColumns($table);
$oldKeys = $this->db->getTableKeys($table);
$alters = array();
// Get the fields and keys from the XML that we are aiming for.
$newFields = $structure->xpath('field');
$newKeys = $structure->xpath('key');
// Loop through each field in the new structure.
foreach ($newFields as $field)
{
$fName = (string) $field['Field'];
if (isset($oldFields[$fName]))
{
// The field exists, check it's the same.
$column = $oldFields[$fName];
// Test whether there is a change.
$change = ((string) $field['Type'] != $column->Type) || ((string) $field['Null'] != $column->Null)
|| ((string) $field['Default'] != $column->Default) || ((string) $field['Extra'] != $column->Extra);
if ($change)
{
$alters[] = $this->getChangeColumnSQL($table, $field);
}
// Unset this field so that what we have left are fields that need to be removed.
unset($oldFields[$fName]);
}
else
{
// The field is new.
$alters[] = $this->getAddColumnSQL($table, $field);
}
}
// Any columns left are orphans
foreach ($oldFields as $name => $column)
{
// Delete the column.
$alters[] = $this->getDropColumnSQL($table, $name);
}
// Get the lookups for the old and new keys.
$oldLookup = $this->getKeyLookup($oldKeys);
$newLookup = $this->getKeyLookup($newKeys);
// Loop through each key in the new structure.
foreach ($newLookup as $name => $keys)
{
// Check if there are keys on this field in the existing table.
if (isset($oldLookup[$name]))
{
$same = true;
$newCount = count($newLookup[$name]);
$oldCount = count($oldLookup[$name]);
// There is a key on this field in the old and new tables. Are they the same?
if ($newCount == $oldCount)
{
// Need to loop through each key and do a fine grained check.
for ($i = 0; $i < $newCount; $i++)
{
$same = (((string) $newLookup[$name][$i]['Non_unique'] == $oldLookup[$name][$i]->Non_unique)
&& ((string) $newLookup[$name][$i]['Column_name'] == $oldLookup[$name][$i]->Column_name)
&& ((string) $newLookup[$name][$i]['Seq_in_index'] == $oldLookup[$name][$i]->Seq_in_index)
&& ((string) $newLookup[$name][$i]['Collation'] == $oldLookup[$name][$i]->Collation)
&& ((string) $newLookup[$name][$i]['Index_type'] == $oldLookup[$name][$i]->Index_type));
// Debug.
// echo '<pre>';
// echo '<br />Non_unique: '.
// ((string) $newLookup[$name][$i]['Non_unique'] == $oldLookup[$name][$i]->Non_unique ? 'Pass' : 'Fail').' '.
// (string) $newLookup[$name][$i]['Non_unique'].' vs '.$oldLookup[$name][$i]->Non_unique;
// echo '<br />Column_name: '.
// ((string) $newLookup[$name][$i]['Column_name'] == $oldLookup[$name][$i]->Column_name ? 'Pass' : 'Fail').' '.
// (string) $newLookup[$name][$i]['Column_name'].' vs '.$oldLookup[$name][$i]->Column_name;
// echo '<br />Seq_in_index: '.
// ((string) $newLookup[$name][$i]['Seq_in_index'] == $oldLookup[$name][$i]->Seq_in_index ? 'Pass' : 'Fail').' '.
// (string) $newLookup[$name][$i]['Seq_in_index'].' vs '.$oldLookup[$name][$i]->Seq_in_index;
// echo '<br />Collation: '.
// ((string) $newLookup[$name][$i]['Collation'] == $oldLookup[$name][$i]->Collation ? 'Pass' : 'Fail').' '.
// (string) $newLookup[$name][$i]['Collation'].' vs '.$oldLookup[$name][$i]->Collation;
// echo '<br />Index_type: '.
// ((string) $newLookup[$name][$i]['Index_type'] == $oldLookup[$name][$i]->Index_type ? 'Pass' : 'Fail').' '.
// (string) $newLookup[$name][$i]['Index_type'].' vs '.$oldLookup[$name][$i]->Index_type;
// echo '<br />Same = '.($same ? 'true' : 'false');
// echo '</pre>';
if (!$same)
{
// Break out of the loop. No need to check further.
break;
}
}
}
else
{
// Count is different, just drop and add.
$same = false;
}
if (!$same)
{
$alters[] = $this->getDropKeySQL($table, $name);
$alters[] = $this->getAddKeySQL($table, $keys);
}
// Unset this field so that what we have left are fields that need to be removed.
unset($oldLookup[$name]);
}
else
{
// This is a new key.
$alters[] = $this->getAddKeySQL($table, $keys);
}
}
// Any keys left are orphans.
foreach ($oldLookup as $name => $keys)
{
if (strtoupper($name) == 'PRIMARY')
{
$alters[] = $this->getDropPrimaryKeySQL($table);
}
else
{
$alters[] = $this->getDropKeySQL($table, $name);
}
}
return $alters;
}
/**
* Get the syntax to alter a column.
*
* @param string $table The name of the database table to alter.
* @param SimpleXMLElement $field The XML definition for the field.
*
* @return string
*
* @since 11.1
*/
protected function getChangeColumnSQL($table, SimpleXMLElement $field)
{
$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' CHANGE COLUMN ' . $this->db->quoteName((string) $field['Field']) . ' '
. $this->getColumnSQL($field);
return $sql;
}
/**
* Get the SQL syntax for a single column that would be included in a table create or alter statement.
*
* @param SimpleXMLElement $field The XML field definition.
*
* @return string
*
* @since 11.1
*/
protected function getColumnSQL(SimpleXMLElement $field)
{
// Initialise variables.
// TODO Incorporate into parent class and use $this.
$blobs = array('text', 'smalltext', 'mediumtext', 'largetext');
$fName = (string) $field['Field'];
$fType = (string) $field['Type'];
$fNull = (string) $field['Null'];
$fDefault = isset($field['Default']) ? (string) $field['Default'] : null;
$fExtra = (string) $field['Extra'];
$sql = $this->db->quoteName($fName) . ' ' . $fType;
if ($fNull == 'NO')
{
if (in_array($fType, $blobs) || $fDefault === null)
{
$sql .= ' NOT NULL';
}
else
{
// TODO Don't quote numeric values.
$sql .= ' NOT NULL DEFAULT ' . $this->db->quote($fDefault);
}
}
else
{
if ($fDefault === null)
{
$sql .= ' DEFAULT NULL';
}
else
{
// TODO Don't quote numeric values.
$sql .= ' DEFAULT ' . $this->db->quote($fDefault);
}
}
if ($fExtra)
{
$sql .= ' ' . strtoupper($fExtra);
}
return $sql;
}
/**
* Get the SQL syntax to drop a column.
*
* @param string $table The table name.
* @param string $name The name of the field to drop.
*
* @return string
*
* @since 11.1
*/
protected function getDropColumnSQL($table, $name)
{
$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' DROP COLUMN ' . $this->db->quoteName($name);
return $sql;
}
/**
* Get the SQL syntax to drop a key.
*
* @param string $table The table name.
* @param string $name The name of the key to drop.
*
* @return string
*
* @since 11.1
*/
protected function getDropKeySQL($table, $name)
{
$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' DROP KEY ' . $this->db->quoteName($name);
return $sql;
}
/**
* Get the SQL syntax to drop a key.
*
* @param string $table The table name.
*
* @return string
*
* @since 11.1
*/
protected function getDropPrimaryKeySQL($table)
{
$sql = 'ALTER TABLE ' . $this->db->quoteName($table) . ' DROP PRIMARY KEY';
return $sql;
}
/**
* Get the details list of keys for a table.
*
* @param array $keys An array of objects that comprise the keys for the table.
*
* @return array The lookup array. array({key name} => array(object, ...))
*
* @since 11.1
* @throws Exception
*/
protected function getKeyLookup($keys)
{
// First pass, create a lookup of the keys.
$lookup = array();
foreach ($keys as $key)
{
if ($key instanceof SimpleXMLElement)
{
$kName = (string) $key['Key_name'];
}
else
{
$kName = $key->Key_name;
}
if (empty($lookup[$kName]))
{
$lookup[$kName] = array();
}
$lookup[$kName][] = $key;
}
return $lookup;
}
/**
* Get the SQL syntax for a key.
*
* @param array $columns An array of SimpleXMLElement objects comprising the key.
*
* @return string
*
* @since 11.1
*/
protected function getKeySQL($columns)
{
// TODO Error checking on array and element types.
$kNonUnique = (string) $columns[0]['Non_unique'];
$kName = (string) $columns[0]['Key_name'];
$kColumn = (string) $columns[0]['Column_name'];
$prefix = '';
if ($kName == 'PRIMARY')
{
$prefix = 'PRIMARY ';
}
elseif ($kNonUnique == 0)
{
$prefix = 'UNIQUE ';
}
$nColumns = count($columns);
$kColumns = array();
if ($nColumns == 1)
{
$kColumns[] = $this->db->quoteName($kColumn);
}
else
{
foreach ($columns as $column)
{
$kColumns[] = (string) $column['Column_name'];
}
}
$sql = $prefix . 'KEY ' . ($kName != 'PRIMARY' ? $this->db->quoteName($kName) : '') . ' (' . implode(',', $kColumns) . ')';
return $sql;
}
/**
* Get the real name of the table, converting the prefix wildcard string if present.
*
* @param string $table The name of the table.
*
* @return string The real name of the table.
*
* @since 11.1
*/
protected function getRealTableName($table)
{
// TODO Incorporate into parent class and use $this.
$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 11.1
* @throws Exception on error.
* @todo If it's not XML convert to XML first.
*/
protected function mergeStructure()
{
// Initialise variables.
$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) $query);
if (!$this->db->execute())
{
$this->addLog('Fail: ' . $this->db->getQuery());
throw new Exception($this->db->getErrorMsg());
}
else
{
$this->addLog('Pass: ' . $this->db->getQuery());
}
}
}
}
else
{
// This is a new table.
$sql = $this->xmlToCreate($table);
$this->db->setQuery((string) $sql);
if (!$this->db->execute())
{
$this->addLog('Fail: ' . $this->db->getQuery());
throw new Exception($this->db->getErrorMsg());
}
else
{
$this->addLog('Pass: ' . $this->db->getQuery());
}
}
}
}
/**
* Sets the database connector to use for exporting structure and/or data from MySQL.
*
* @param JDatabaseMySQL $db The database connector.
*
* @return JDatabaseImporterMySQL Method supports chaining.
*
* @since 11.1
*/
public function setDbo(JDatabaseMySQL $db)
{
$this->db = $db;
return $this;
}
/**
* Sets an internal option to merge the structure based on the input data.
*
* @param boolean $setting True to export the structure, false to not.
*
* @return JDatabaseImporterMySQL Method supports chaining.
*
* @since 11.1
*/
public function withStructure($setting = true)
{
$this->options->set('with-structure', (boolean) $setting);
return $this;
}
}