1 files changed, 136 insertions, 0 deletions
diff --git a/lib/db/schema.php b/lib/db/schema.php
new file mode 100644
index 00000000000..fa053c64ef0
--- /dev/null
+++ b/lib/db/schema.php
@@ -0,0 +1,136 @@
+<?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.
+ */
+
+class OC_DB_Schema {
+	/**
+	 * @brief saves database scheme to xml file
+	 * @param \Doctrine\DBAL\Connection $conn
+	 * @param string $file name of file
+	 * @param int|string $mode
+	 * @return bool
+	 *
+	 * TODO: write more documentation
+	 */
+	public static function getDbStructure( $conn, $file, $mode=MDB2_SCHEMA_DUMP_STRUCTURE) {
+		$sm = $conn->getSchemaManager();
+
+		return OC_DB_MDB2SchemaWriter::saveSchemaToFile($file, $sm);
+	}
+
+	/**
+	 * @brief Creates tables from XML file
+	 * @param string $file file to read structure from
+	 * @return bool
+	 *
+	 * TODO: write more documentation
+	 */
+	public static function createDbFromStructure( $conn, $file ) {
+		$toSchema = OC_DB_MDB2SchemaReader::loadSchemaFromFile($file, $conn->getDatabasePlatform());
+		return self::executeSchemaChange($conn, $toSchema);
+	}
+
+	/**
+	 * @brief update the database scheme
+	 * @param string $file file to read structure from
+	 * @return bool
+	 */
+	public static function updateDbFromStructure($conn, $file) {
+		$sm = $conn->getSchemaManager();
+		$fromSchema = $sm->createSchema();
+
+		$toSchema = OC_DB_MDB2SchemaReader::loadSchemaFromFile($file, $conn->getDatabasePlatform());
+
+		// remove tables we don't know about
+		foreach($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 = $conn->getDatabasePlatform();
+		$tables = $schemaDiff->newTables + $schemaDiff->changedTables + $schemaDiff->removedTables;
+		foreach($tables as $tableDiff) {
+			$tableDiff->name = $platform->quoteIdentifier($tableDiff->name);
+		}
+
+
+		//$from = $fromSchema->toSql($conn->getDatabasePlatform());
+		//$to = $toSchema->toSql($conn->getDatabasePlatform());
+		//echo($from[9]);
+		//echo '<br>';
+		//echo($to[9]);
+		//var_dump($from, $to);
+		return self::executeSchemaChange($conn, $schemaDiff);
+	}
+
+	/**
+	 * @brief drop a table
+	 * @param string $tableName the table to drop
+	 */
+	public static function dropTable($conn, $tableName) {
+		$sm = $conn->getSchemaManager();
+		$fromSchema = $sm->createSchema();
+		$toSchema = clone $fromSchema;
+		$toSchema->dropTable($tableName);
+		$sql = $fromSchema->getMigrateToSql($toSchema, $conn->getDatabasePlatform());
+		$conn->execute($sql);
+	}
+
+	/**
+	 * remove all tables defined in a database structure xml file
+	 * @param string $file the xml file describing the tables
+	 */
+	public static function removeDBStructure($conn, $file) {
+		$fromSchema = OC_DB_MDB2SchemaReader::loadSchemaFromFile($file, $conn->getDatabasePlatform());
+		$toSchema = clone $fromSchema;
+		foreach($toSchema->getTables() as $table) {
+			$toSchema->dropTable($table->getName());
+		}
+		$comparator = new \Doctrine\DBAL\Schema\Comparator();
+		$schemaDiff = $comparator->compare($fromSchema, $toSchema);
+		self::executeSchemaChange($conn, $schemaDiff);
+	}
+
+	/**
+	 * @brief replaces the ownCloud tables with a new set
+	 * @param $file string path to the MDB2 xml db export file
+	 */
+	public static function replaceDB( $conn, $file ) {
+		$apps = OC_App::getAllApps();
+		self::beginTransaction();
+		// Delete the old tables
+		self::removeDBStructure( $conn, OC::$SERVERROOT . '/db_structure.xml' );
+
+		foreach($apps as $app) {
+			$path = OC_App::getAppPath($app).'/appinfo/database.xml';
+			if(file_exists($path)) {
+				self::removeDBStructure( $conn, $path );
+			}
+		}
+
+		// Create new tables
+		self::commit();
+	}
+
+	private static function executeSchemaChange($conn, $schema) {
+		$conn->beginTransaction();
+		foreach($schema->toSql($conn->getDatabasePlatform()) as $sql) {
+			$conn->query($sql);
+		}
+		$conn->commit();
+	}
+}