Function loadDatabase

src/Interpreters/loadMetadata.cpp:102–136

}

static void loadDatabase(
    ContextMutablePtr context,
    const String & database,
    const fs::path & metadata_file_path,
    bool force_restore_data)
{
    /// If it is already loaded.
    if (DatabaseCatalog::instance().isDatabaseExist(database))
        return;

    String database_attach_query;

    auto default_db_disk = Context::getGlobalContextInstance()->getDatabaseDisk();
    if (default_db_disk->existsFile(metadata_file_path))
    {
        /// There is .sql file with database creation statement.
        database_attach_query = readMetadataFile(default_db_disk, metadata_file_path);
    }
    else
    {
        /// It's first server run and we need create default and system databases.
        /// .sql file with database engine will be written for CREATE query.
        database_attach_query = "CREATE DATABASE " + backQuoteIfNeed(database);
    }

    try
    {
        executeCreateQuery(database_attach_query, context, database, metadata_file_path, /* create */ true, force_restore_data);
    }
    catch (Exception & e)
    {
        e.addMessage(fmt::format("while loading database {} from file {}", backQuote(database), metadata_file_path));
        throw;
    }
}

static void checkUnsupportedVersion(ContextMutablePtr, const String & database_name)
{