/**
* Run a migration to the current version or the given target version.
*
* @param string $to The version to migrate to.
* @param string $dryRun Whether or not to make this a dry run and not execute anything.
* @return array $sql The array of migration sql statements
* @throws MigrationException
*/
public function migrate($to = null, $dryRun = false)
{
if ($to === null) {
$to = $this->_configuration->getLatestVersion();
}
$from = $this->_configuration->getCurrentVersion();
$from = (string) $from;
$to = (string) $to;
$migrations = $this->_configuration->getMigrations();
if (!isset($migrations[$to]) && $to > 0) {
throw MigrationException::unknownMigrationVersion($to);
}
if ($from === $to) {
throw MigrationException::alreadyAtVersion($to);
}
$direction = $from > $to ? 'down' : 'up';
$migrations = $this->_configuration->getMigrationsToExecute($direction, $to);
if ($dryRun === false) {
$this->_outputWriter->write(sprintf('Migrating <info>%s</info> to <comment>%s</comment> from <comment>%s</comment>', $direction, $to, $from));
} else {
$this->_outputWriter->write(sprintf('Executing dry run of migration <info>%s</info> to <comment>%s</comment> from <comment>%s</comment>', $direction, $to, $from));
}
if (empty($migrations)) {
throw MigrationException::noMigrationsToExecute();
}
$sql = array();
foreach ($migrations as $version) {
$versionSql = $version->execute($direction, $dryRun);
$sql[$version->getVersion()] = $versionSql;
}
return $sql;
}
