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<?php
/**
* Copyright (c) 2012 Bart Visscher <bartv@thisnet.nl>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC\DB;
class MDB2SchemaManager {
/**
* @var \OC\DB\Connection $conn
*/
protected $conn;
/**
* @param \OC\DB\Connection $conn
*/
public function __construct($conn) {
$this->conn = $conn;
$this->conn->close();
$this->conn->connect();
}
/**
* @brief saves database scheme to xml file
* @param string $file name of file
* @param int|string $mode
* @return bool
*
* TODO: write more documentation
*/
public function getDbStructure( $file, $mode = MDB2_SCHEMA_DUMP_STRUCTURE) {
$sm = $this->conn->getSchemaManager();
return \OC_DB_MDB2SchemaWriter::saveSchemaToFile($file, $sm);
}
/**
* @brief Creates tables from XML file
* @param string $file file to read structure from
* @return bool
*
* TODO: write more documentation
*/
public function createDbFromStructure( $file ) {
$schemaReader = new MDB2SchemaReader(\OC_Config::getObject(), $this->conn->getDatabasePlatform());
$toSchema = $schemaReader->loadSchemaFromFile($file);
return $this->executeSchemaChange($toSchema);
}
/**
* @brief update the database scheme
* @param string $file file to read structure from
* @return bool
*/
public function updateDbFromStructure($file, $generateSql = false) {
$sm = $this->conn->getSchemaManager();
$fromSchema = $sm->createSchema();
$schemaReader = new MDB2SchemaReader(\OC_Config::getObject(), $this->conn->getDatabasePlatform());
$toSchema = $schemaReader->loadSchemaFromFile($file);
// remove tables we don't know about
/** @var $table \Doctrine\DBAL\Schema\Table */
foreach($fromSchema->getTables() as $table) {
if (!$toSchema->hasTable($table->getName())) {
$fromSchema->dropTable($table->getName());
}
}
// remove sequences we don't know about
foreach($fromSchema->getSequences() as $table) {
if (!$toSchema->hasSequence($table->getName())) {
$fromSchema->dropSequence($table->getName());
}
}
$comparator = new \Doctrine\DBAL\Schema\Comparator();
$schemaDiff = $comparator->compare($fromSchema, $toSchema);
$platform = $this->conn->getDatabasePlatform();
foreach($schemaDiff->changedTables as $tableDiff) {
$tableDiff->name = $platform->quoteIdentifier($tableDiff->name);
}
if ($generateSql) {
return $this->generateChangeScript($schemaDiff);
}
return $this->executeSchemaChange($schemaDiff);
}
/**
* @brief drop a table
* @param string $tableName the table to drop
*/
public function dropTable($tableName) {
$sm = $this->conn->getSchemaManager();
$fromSchema = $sm->createSchema();
$toSchema = clone $fromSchema;
$toSchema->dropTable($tableName);
$sql = $fromSchema->getMigrateToSql($toSchema, $this->conn->getDatabasePlatform());
$this->conn->executeQuery($sql);
}
/**
* remove all tables defined in a database structure xml file
* @param string $file the xml file describing the tables
*/
public function removeDBStructure($file) {
$schemaReader = new MDB2SchemaReader(\OC_Config::getObject(), $this->conn->getDatabasePlatform());
$fromSchema = $schemaReader->loadSchemaFromFile($file);
$toSchema = clone $fromSchema;
/** @var $table \Doctrine\DBAL\Schema\Table */
foreach($toSchema->getTables() as $table) {
$toSchema->dropTable($table->getName());
}
$comparator = new \Doctrine\DBAL\Schema\Comparator();
$schemaDiff = $comparator->compare($fromSchema, $toSchema);
$this->executeSchemaChange($schemaDiff);
}
/**
* @brief replaces the ownCloud tables with a new set
* @param $file string path to the MDB2 xml db export file
*/
public function replaceDB( $file ) {
$apps = \OC_App::getAllApps();
$this->conn->beginTransaction();
// Delete the old tables
$this->removeDBStructure( \OC::$SERVERROOT . '/db_structure.xml' );
foreach($apps as $app) {
$path = \OC_App::getAppPath($app).'/appinfo/database.xml';
if(file_exists($path)) {
$this->removeDBStructure( $path );
}
}
// Create new tables
$this->conn->commit();
}
/**
* @param \Doctrine\DBAL\Schema\Schema $schema
* @return bool
*/
private function executeSchemaChange($schema) {
$this->conn->beginTransaction();
foreach($schema->toSql($this->conn->getDatabasePlatform()) as $sql) {
$this->conn->query($sql);
}
$this->conn->commit();
return true;
}
/**
* @param \Doctrine\DBAL\Schema\Schema $schema
* @return string
*/
public function generateChangeScript($schema) {
$script = '';
$sqls = $schema->toSql($this->conn->getDatabasePlatform());
foreach($sqls as $sql) {
$script .= $sql . ';';
$script .= PHP_EOL;
}
return $script;
}
}
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