function alterDatabaseActionTable()
 {
     $this->oSchema = MDB2_Schema::factory(OA_DB::singleton(OA_DB::getDsn()));
     $prefix = $GLOBALS['_MAX']['CONF']['table']['prefix'];
     OA_DB::setCaseSensitive();
     $aPrev = $this->oSchema->getDefinitionFromDatabase(array($prefix . 'database_action'));
     OA_DB::disableCaseSensitive();
     $aCurr = $this->_getLatestDatabaseActionSchema($prefix);
     $aChanges = $this->oSchema->compareDefinitions($aCurr, $aPrev);
     if (is_array($aChanges) && count($aChanges) > 0) {
         if (isset($aChanges['tables']['change'][$prefix . 'database_action'])) {
             if (isset($aChanges['tables']['change'][$prefix . 'database_action']['indexes']['add']['database_action_pkey'])) {
                 unset($aChanges['tables']['change'][$prefix . 'database_action']['indexes']['add']['database_action_pkey']);
                 unset($aChanges['tables']['change'][$prefix . 'database_action']['indexes']['change']);
             }
             if (isset($aChanges['tables']['change'][$prefix . 'database_action']['add']['database_action_id'])) {
                 $result = $this->oSchema->alterDatabase($aCurr, $aPrev, $aChanges);
                 if (PEAR::isError($result)) {
                     $this->oUpgrade->oLogger->logError($result->getUserInfo());
                     return false;
                 }
                 $this->oUpgrade->oLogger->log('database_action table schema successfully upgraded');
                 return true;
             }
         }
     }
     $this->oUpgrade->oLogger->log('database_action table schema upgrade unnecessary');
     return true;
 }

 /**
  * The constructor method.
  */
 function __construct()
 {
     parent::__construct();
     $this->oDbh = OA_DB::singleton();
     $this->oCache = new OA_DB_XmlCache();
     $this->oSchema =& MDB2_Schema::factory($this->oDbh, array('force_defaults' => false));
 }

 /**
  * verify the input file
  * instantiate the schema and table objects
  *
  * @param string $datafile
  * @param string $directory
  * @return boolean
  */
 function init($datafile = 'fjsdj', $directory = '/tests/datasets/mdb2schema/')
 {
     if (!parent::init()) {
         return false;
     }
     if (!$directory) {
         $directory = '/tests/datasets/mdb2schema/';
     }
     $this->directory = $directory;
     if (substr_count($this->directory, MAX_PATH) < 1) {
         $this->directory = MAX_PATH . $this->directory;
     }
     $this->datafile = $datafile;
     if (!file_exists($this->directory . $this->datafile)) {
         return false;
     }
     $this->oSchema =& MDB2_Schema::factory($this->oDbh);
     if (PEAR::isError($this->oSchema)) {
         return false;
     }
     $this->oTable = new OA_DB_Table();
     if (PEAR::isError($this->oTable)) {
         return false;
     }
     return true;
 }

 /**
  * The constructor method.
  */
 function Test_OA_DB_XmlCache()
 {
     $this->UnitTestCase();
     $this->oDbh = OA_DB::singleton();
     $this->oCache = new OA_DB_XmlCache();
     $this->oSchema =& MDB2_Schema::factory($this->oDbh, array('force_defaults' => false));
 }

 function removeDashboardColumns()
 {
     $this->oSchema = MDB2_Schema::factory(OA_DB::singleton(OA_DB::getDsn()));
     $prefix = $GLOBALS['_MAX']['CONF']['table']['prefix'];
     $table = 'preference';
     $aColumns = array('ad_clicks_sum', 'ad_views_sum', 'ad_clicks_per_second', 'ad_views_per_second', 'ad_cs_data_last_sent', 'ad_cs_data_last_sent', 'ad_cs_data_last_received');
     OA_DB::setCaseSensitive();
     $aDef = $this->oSchema->getDefinitionFromDatabase(array($prefix . $table));
     OA_DB::disableCaseSensitive();
     if (is_array($aDef) && count($aDef) > 0) {
         $aTask['remove'] = array();
         if (isset($aDef['tables'][$prefix . $table])) {
             foreach ($aColumns as $column) {
                 if (isset($aDef['tables'][$prefix . $table]['fields'][$column])) {
                     $aTask['remove'][$column] = array();
                     $this->oUpgrade->oLogger->logOnly("preference.{$column} found");
                 }
             }
         }
         if (count($aTask['remove'] > 0)) {
             $result = $this->oSchema->db->manager->alterTable($prefix . $table, $aTask, false);
         }
     }
     $this->oUpgrade->oLogger->logOnly('preference table schema upgrade for dashboard unnecessary');
     return true;
 }

 function setUp()
 {
     PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'catchErrorHandlerPEAR');
     $this->dsn = $GLOBALS['dsn'];
     $this->options = $GLOBALS['options'];
     $this->database = $GLOBALS['database'];
     $this->dsn['database'] = $this->database;
     $this->schema =& MDB2_Schema::factory($this->dsn, $this->options);
     if (PEAR::isError($this->schema)) {
         $this->assertTrue(false, 'Could not connect to manager in setUp');
         exit;
     }
 }

 function setUpDatabase()
 {
     // Create a new test table, overwriting old ones.
     require_once 'MDB2/Schema.php';
     $config = $this->getDriverConfig();
     $manager = MDB2_Schema::factory($config['params']);
     $defs = $manager->parseDatabaseDefinition(dirname(dirname(__DIR__)) . '/scripts/sql/test.xml', false, array('name' => $config['params']['database']), false);
     $result = $manager->createTable('hordetest_turba_objects', $defs['tables']['hordetest_turba_objects'], true);
     $this->assertOk($result);
     foreach ($this->_fixtures as $fixture) {
         $this->assertOk($this->_insert($fixture));
     }
 }

 function setUp()
 {
     PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'catchErrorHandlerPEAR');
     $this->dsn = $GLOBALS['dsn'];
     $this->options = $GLOBALS['options'];
     $this->database = $GLOBALS['database'];
     $this->dsn['database'] = $this->database;
     $this->schema =& MDB2_Schema::factory($this->dsn, $this->options);
     if (PEAR::isError($this->schema)) {
         $this->assertTrue(false, 'Could not connect to manager in setUp');
         exit;
     }
     $this->aSchemas = array(1 => SCHEMA_PATH . 'schema_1_original.xml', 2 => SCHEMA_PATH . 'schema_2_newfield.xml', 3 => SCHEMA_PATH . 'schema_3_primarykey.xml', 4 => SCHEMA_PATH . 'schema_4_idxfieldorder.xml', 5 => SCHEMA_PATH . 'schema_5_fieldtype.xml', 6 => SCHEMA_PATH . 'schema_6_removefield.xml', 7 => SCHEMA_PATH . 'schema_7_removeindex.xml', 8 => SCHEMA_PATH . 'schema_8_addtable.xml', 9 => SCHEMA_PATH . 'schema_9_removetable.xml', 10 => SCHEMA_PATH . 'schema_10_keyfield.xml');
 }

 function setUp()
 {
     $this->dsn = $GLOBALS['dsn'];
     $this->options = $GLOBALS['options'];
     $this->database = $GLOBALS['database'];
     $backup_file = $this->driver_input_file . $this->backup_extension;
     if (file_exists($backup_file)) {
         unlink($backup_file);
     }
     $backup_file = $this->lob_input_file . $this->backup_extension;
     if (file_exists($backup_file)) {
         unlink($backup_file);
     }
     $this->schema =& MDB2_Schema::factory($this->dsn, $this->options);
     if (PEAR::isError($this->schema)) {
         $this->assertTrue(false, 'Could not connect to manager in setUp');
         exit;
     }
 }

function generateXmlCache($xmlFiles, $callback = 'parseDatabaseDefinitionFile')
{
    global $aSkipFiles, $aOptions, $oDbh, $oCache;
    foreach ($xmlFiles as $fileName) {
        if (!in_array(baseName($fileName), $aSkipFiles)) {
            echo "  => " . basename($fileName) . ": ";
            flush();
            $oSchema =& MDB2_Schema::factory($oDbh, $aOptions);
            $result = $oSchema->{$callback}($fileName, true);
            if (PEAR::isError($result)) {
                clean_up();
                die("Failed\n");
            } else {
                $oCache->save($result, $fileName);
                echo "Processed";
                eol_flush();
            }
            unset($result);
        }
    }
}

 function setUp()
 {
     PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'catchErrorHandlerPEAR');
     $this->dsn = $GLOBALS['dsn'];
     $this->options = $GLOBALS['options'];
     $this->database = $GLOBALS['database'];
     $this->dsn['database'] = $this->database;
     $backup_file = SCHEMA_PATH . $this->driver_input_file . $this->backup_extension;
     if (file_exists($backup_file)) {
         unlink($backup_file);
     }
     $backup_file = SCHEMA_PATH . $this->lob_input_file . $this->backup_extension;
     if (file_exists($backup_file)) {
         unlink($backup_file);
     }
     $this->schema =& MDB2_Schema::factory($this->dsn, $this->options);
     if (PEAR::isError($this->schema)) {
         $this->assertTrue(false, 'Could not connect to manager in setUp');
         exit;
     }
 }

 /**
  * @brief connects to a MDB2 database scheme
  * @returns true/false
  *
  * Connects to a MDB2 database scheme
  */
 private static function connectScheme()
 {
     // We need a mdb2 database connection
     self::connectMDB2();
     self::$MDB2->loadModule('Manager');
     self::$MDB2->loadModule('Reverse');
     // Connect if this did not happen before
     if (!self::$schema) {
         require_once 'MDB2/Schema.php';
         self::$schema = MDB2_Schema::factory(self::$MDB2);
     }
     return true;
 }

 /**
  * php5 class constructor
  *
  * @param string The XML schema file we are working on
  */
 function __construct($file_schema = 'tables_core.xml', $file_changes = '', $path_schema)
 {
     $this->oLogger = new OA_UpgradeLogger();
     $this->oLogger->setLogFile('schema.log');
     if (empty($path_schema)) {
         $path_schema = '/etc/';
     }
     if (!empty($path_schema) && substr($path_schema, 0, 1) != '/') {
         $path_schema = '/' . $path_schema;
     }
     if (!empty($path_schema) && substr($path_schema, strlen($path_schema) - 4, 4) != 'etc/') {
         $path_schema = $path_schema . 'etc/';
     }
     $this->path_schema_final = MAX_PATH . $path_schema;
     $this->path_schema_trans = MAX_PATH . '/var/';
     $this->path_changes_final = MAX_PATH . $path_schema . 'changes/';
     $this->path_changes_trans = MAX_PATH . '/var/';
     if ($path_schema == '/etc/') {
         $this->path_dbo = MAX_PATH . '/lib/max/Dal/DataObjects/';
     } else {
         $this->path_dbo = $this->path_schema_final . 'DataObjects/';
     }
     //$this->path_links_final = MAX_PATH.'/lib/max/Dal/DataObjects/';
     $this->path_links_final = $this->path_dbo;
     $this->path_links_trans = MAX_PATH . '/var/';
     $file_changes = $file_changes ? $file_changes : 'changes_' . $file_schema;
     $file_links = 'db_schema.links.ini';
     $this->schema_final = $this->path_schema_final . $file_schema;
     $this->schema_trans = $this->path_schema_trans . $file_schema;
     $this->oLogger->log($this->schema_final);
     $this->use_links = $file_schema == 'tables_core.xml';
     if ($this->use_links) {
         $this->links_final = $this->path_links_final . $file_links;
         $this->links_trans = $this->path_links_trans . $file_links;
     }
     $this->changes_final = $this->path_changes_final . $file_changes;
     $this->changes_trans = $this->path_changes_trans . $file_changes;
     $this->oLogger->log($this->changes_final);
     if ($this->use_links) {
         $this->aFile_perms = array($this->path_schema_trans, $this->path_changes_final, $this->path_changes_trans, $this->path_links_trans, $this->links_final, $this->schema_final, MAX_SCHEMA_LOG, MAX_PATH . '/www/devel/');
     } else {
         $this->aFile_perms = array($this->path_schema_trans, $this->path_changes_final, $this->path_changes_trans, $this->schema_final, MAX_SCHEMA_LOG, MAX_PATH . '/www/devel/');
     }
     $this->aDump_options = array('output_mode' => 'file', 'output' => $this->schema_trans, 'end_of_line' => "\n", 'xsl_file' => "xsl/mdb2_schema.xsl", 'custom_tags' => array('version' => '', 'status' => 'transitional'));
     $this->oSchema = MDB2_Schema::factory(OA_DB::singleton(OA_DB::getDsn()), $this->aDump_options);
     $this->dd_file = 'etc/dd.generic.xml';
     $this->aDD_definition = $this->oSchema->parseDictionaryDefinitionFile($this->dd_file);
     ksort($this->aDD_definition);
     //$this->aXMLRPCServer = array('path'=>'/upms/xmlrpc.php', 'host'=>'localhost','port'=>'80');
 }

 /**
  * Create or upgrade the database needed for pearweb
  *
  * This helper function scans for previous database versions,
  * and upgrades the database based on differences between the
  * previous version's schema and the one distributed with this
  * version.
  *
  * If the database has never been created, then it is created.
  *
  * @param array $answers
  * @return boolean
  */
 function initializeDatabase($answers)
 {
     $this->dsn = array('phptype' => $answers['driver'], 'username' => $answers['user'], 'password' => $answers['password'], 'hostspec' => $answers['host'], 'database' => $answers['database']);
     $a = MDB2_Schema::factory($this->dsn, array('idxname_format' => '%s', 'seqname_format' => 'id', 'quote_identifier' => true));
     // for upgrade purposes
     if (!file_exists('@www-dir@' . DIRECTORY_SEPARATOR . 'sql' . DIRECTORY_SEPARATOR . '.pearweb-upgrade')) {
         if (!mkdir('@www-dir@' . DIRECTORY_SEPARATOR . 'sql' . DIRECTORY_SEPARATOR . '.pearweb-upgrade')) {
             $this->_ui->outputData('error - make sure we can create directories');
             return false;
         }
     }
     PEAR::staticPushErrorHandling(PEAR_ERROR_RETURN);
     $c = $a->parseDatabaseDefinitionFile(realpath('@www-dir@/sql/pearweb_mdb2schema.xml'));
     PEAR::staticPopErrorHandling();
     if (PEAR::isError($c)) {
         $extra = '';
         if (MDB2_Schema::isError($c) || MDB2::isError($c)) {
             $extra = "\n" . $c->getUserInfo();
         }
         $this->_ui->outputData('ERROR: ' . $c->getMessage() . $extra);
         return false;
     }
     $c['name'] = $answers['database'];
     $c['create'] = 1;
     $c['overwrite'] = 0;
     $dir = opendir('@www-dir@/sql/.pearweb-upgrade');
     $oldversion = false;
     while (false !== ($entry = readdir($dir))) {
         if ($entry[0] === '.') {
             continue;
         }
         if (strpos($entry, $answers['database']) === 0) {
             // this is one of ours
             // strip databasename-
             $entry = substr($entry, strlen($answers['database']) + 1);
             // strip ".ser"
             $entry = substr($entry, 0, strlen($entry) - 4);
             // ... and we're left with just the version
             if (!$oldversion) {
                 $oldversion = $entry;
                 continue;
             }
             if (version_compare($entry, $oldversion, '>')) {
                 $oldversion = $entry;
             }
         }
     }
     if (!file_exists('@www-dir@/sql/.pearweb-upgrade/' . $answers['database'] . '-@[email protected]')) {
         $fp = fopen('@www-dir@/sql/.pearweb-upgrade/' . $answers['database'] . '-@[email protected]', 'w');
         fwrite($fp, serialize($c));
         fclose($fp);
     }
     if ($oldversion == '@version@') {
         // this is where to change if we need to add a "force upgrade of
         // structure" option
         // we would uncomment the following line:
         //$c['overwrite'] = true;
         $oldversion = false;
     }
     if ($oldversion) {
         $curdef = unserialize(file_get_contents('@www-dir@/sql/.pearweb-upgrade/' . $answers['database'] . '-' . $oldversion . '.ser'));
         if (!is_array($curdef)) {
             $this->_ui->outputData('invalid data returned from previous version');
         }
         // get a database diff (MDB2_Schema is very useful here)
         PEAR::staticPushErrorHandling(PEAR_ERROR_RETURN);
         $c = $a->compareDefinitions($c, $curdef);
         if (PEAR::isError($c)) {
             $this->_ui->outputData($err->getMessage());
             $this->_ui->outputData($err->getUserInfo());
             $this->_ui->outputData('Unable to automatically update database');
             return false;
         }
         $err = $a->updateDatabase($curdef, $c);
         PEAR::staticPopErrorHandling();
     } else {
         PEAR::staticPushErrorHandling(PEAR_ERROR_RETURN);
         $err = $a->createDatabase($c);
         PEAR::staticPopErrorHandling();
     }
     if (PEAR::isError($err)) {
         $this->_ui->outputData($err->getUserInfo());
         $this->_ui->outputData($err->getMessage());
         return false;
     }
     return true;
 }

 /**
  * Initializes a database with data
  *
  * @param array $args Command line arguments
  *
  * @return void
  */
 protected function doInit($args)
 {
     list($typeSource, $dsnSource) = $this->getFileOrDsn($args);
     list($typeDest, $dsnDest) = $this->getFileOrDsn($args);
     if ($typeSource != 'file') {
         throw new MDB2_Schema_Tool_ParameterException('Data must come from a source file');
     }
     if ($typeDest != 'dsn') {
         throw new MDB2_Schema_Tool_ParameterException('A schema can only be loaded into a database, not a file');
     }
     $schemaDest = MDB2_Schema::factory($dsnDest, $this->getSchemaOptions());
     $this->throwExceptionOnError($schemaDest, 'connecting to destination database');
     $definition = $schemaDest->getDefinitionFromDatabase();
     $this->throwExceptionOnError($definition, 'loading definition from database');
     $op = $schemaDest->writeInitialization($dsnSource, $definition);
     $this->throwExceptionOnError($op, 'initializing database');
 }

 /**
  * Installs table(s)/data schema into database
  *
  * @access  public
  * @param   string  $new_schema     New schema file path/name
  * @param   array   $variables      Schema variables
  * @param   string  $old_schema     Old schema file path/name
  * @param   string  $init_data      Schema is include initialization data
  * @param   string  $create         If the database should be created
  * @return  mixed   True on success and Jaws_Error on failure
  */
 function installSchema($new_schema, $variables = array(), $old_schema = false, $init_data = false, $create = true)
 {
     MDB2::loadFile('Schema');
     $dsn = $this->_dsn;
     unset($dsn['database']);
     // If the database should be created
     $variables['create'] = (int) $create;
     // The database name
     $variables['database'] = $this->_dsn['database'];
     // Prefix of all the tables added
     $variables['table_prefix'] = $this->getPrefix();
     // set default charset
     if (!isset($variables['charset'])) {
         $variables['charset'] = $this->getUnicodeCharset();
     }
     $options = array('debug' => false, 'log_line_break' => '<br />', 'portability' => MDB2_PORTABILITY_ALL ^ MDB2_PORTABILITY_EMPTY_TO_NULL ^ MDB2_PORTABILITY_FIX_CASE ^ MDB2_PORTABILITY_RTRIM, 'quote_identifier' => true, 'force_defaults' => false);
     switch ($this->_dsn['phptype']) {
         case 'ibase':
             $options['portability'] = $options['portability'] | MDB2_PORTABILITY_FIX_CASE;
             $options['database_path'] = empty($this->_db_path) ? JAWS_DATA : $this->_db_path;
             break;
         case 'oci8':
             $options['emulate_database'] = false;
             $options['portability'] = $options['portability'] | MDB2_PORTABILITY_FIX_CASE;
             break;
         case 'sqlite':
             $options['database_path'] = empty($this->_db_path) ? JAWS_DATA : $this->_db_path;
             break;
         case 'mssql':
             $options['multibyte_text_field_type'] = $this->Is_FreeTDS_MSSQL_Driver();
             break;
     }
     if ($this->_is_dba) {
         $options['DBA_username'] = $this->_dsn['username'];
         $options['DBA_password'] = $this->_dsn['password'];
     }
     if (!isset($this->schema)) {
         $this->schema =& MDB2_Schema::factory($this->dbc, $options);
         if (MDB2::isError($this->schema)) {
             return $this->schema;
         }
     }
     $method = $init_data === true ? 'writeInitialization' : 'updateDatabase';
     $result = $this->schema->{$method}($new_schema, $old_schema, $variables);
     if (MDB2::isError($result)) {
         $this->schema->disconnect();
         unset($this->schema);
         $GLOBALS['log']->Log(JAWS_ERROR_ERROR, $result->getUserInfo(), 2);
         return new Jaws_Error($result->getMessage(), $result->getCode(), JAWS_ERROR_ERROR, 1);
     }
     return $result;
 }

// MDB2::factory will return a PEAR::MDB2 instance on success
// or a Pear MDB2 error object on error
// You can alternatively build a dsn here
// $dsn = "$mdb2_type://$user:$pass@$host/$mdb2_name";
Var_Dump($dsn);
$mdb2 =& MDB2::factory($dsn);
// With PEAR::isError you can differentiate between an error or
// a valid connection.
if (PEAR::isError($mdb2)) {
    die(__LINE__ . $mdb2->getMessage());
}
// this loads the MDB2_Schema manager
// this is a separate package you must install
require_once 'MDB2/Schema.php';
// you can either pass a dsn string, a dsn array or an exisiting mdb2 connection
$schema =& MDB2_Schema::factory($mdb2);
$input_file = 'metapear_test_db.schema';
// lets create the database using 'metapear_test_db.schema'
// if you have allready run this script you should have 'metapear_test_db.schema.before'
// in that case MDB2 will just compare the two schemas and make any
// necessary modifications to the existing database
Var_Dump($schema->updateDatabase($input_file, $input_file . '.before'));
echo 'updating database from xml schema file<br>';
echo 'switching to database: ' . $mdb2_name . '<br>';
$mdb2->setDatabase($mdb2_name);
// happy query
$query = 'SELECT * FROM test';
echo 'query for the following examples:' . $query . '<br>';
// run the query and get a result handler
$result = $mdb2->query($query);
// lets just get row:0 and free the result

 function &raiseError($msg = null, $ecode = MDB2_SCHEMA_ERROR_PARSE)
 {
     if (is_null($this->error)) {
         $error = 'Parser error: ' . $msg . "\n";
         $this->error =& MDB2_Schema::raiseError($ecode, null, null, $error);
     }
     return $this->error;
 }

 function _getFieldIdName($table)
 {
     $dbh =& OA_DB::singleton();
     $schema = MDB2_Schema::factory($dbh);
     $definition = $schema->getDefinitionFromDatabase(array($table));
     foreach ($definition['tables'][$table]['fields'] as $fieldname => $dataField) {
         if (isset($dataField['autoincrement']) && 1 == $dataField['autoincrement']) {
             return $fieldname;
         }
     }
     return null;
 }

 /**
  * Compare the local database schema with the reference schema
  * required for this version of Roundcube
  *
  * @param boolean True if the schema schould be updated
  * @return boolean True if the schema is up-to-date, false if not or an error occured
  */
 function mdb2_schema_check($update = false)
 {
     if (!$this->configured) {
         return false;
     }
     $options = array('use_transactions' => false, 'log_line_break' => "\n", 'idxname_format' => '%s', 'debug' => false, 'quote_identifier' => true, 'force_defaults' => false, 'portability' => true);
     $dsnw = $this->config['db_dsnw'];
     $schema = MDB2_Schema::factory($dsnw, $options);
     $schema->db->supported['transactions'] = false;
     if (PEAR::isError($schema)) {
         $this->raise_error(array('code' => $schema->getCode(), 'message' => $schema->getMessage() . ' ' . $schema->getUserInfo()));
         return false;
     } else {
         $definition = $schema->getDefinitionFromDatabase();
         $definition['charset'] = 'utf8';
         if (PEAR::isError($definition)) {
             $this->raise_error(array('code' => $definition->getCode(), 'message' => $definition->getMessage() . ' ' . $definition->getUserInfo()));
             return false;
         }
         // load reference schema
         $dsn_arr = MDB2::parseDSN($this->config['db_dsnw']);
         $ref_schema = INSTALL_PATH . 'SQL/' . $dsn_arr['phptype'] . '.schema.xml';
         if (is_readable($ref_schema)) {
             $reference = $schema->parseDatabaseDefinition($ref_schema, false, array(), $schema->options['fail_on_invalid_names']);
             if (PEAR::isError($reference)) {
                 $this->raise_error(array('code' => $reference->getCode(), 'message' => $reference->getMessage() . ' ' . $reference->getUserInfo()));
             } else {
                 $diff = $schema->compareDefinitions($reference, $definition);
                 if (empty($diff)) {
                     return true;
                 } else {
                     if ($update) {
                         // update database schema with the diff from the above check
                         $success = $schema->alterDatabase($reference, $definition, $diff);
                         if (PEAR::isError($success)) {
                             $this->raise_error(array('code' => $success->getCode(), 'message' => $success->getMessage() . ' ' . $success->getUserInfo()));
                         } else {
                             return true;
                         }
                     }
                 }
                 echo '<pre>';
                 var_dump($diff);
                 echo '</pre>';
                 return false;
             }
         } else {
             $this->raise_error(array('message' => "Could not find reference schema file ({$ref_schema})"));
         }
         return false;
     }
     return false;
 }