public Builder database(String database) {
            if (!ClickHouseChecker.isNullOrEmpty(database)) {
                options.put(ClickHouseClientOption.DATABASE.getKey(), database);
            } else {
                options.remove(ClickHouseClientOption.DATABASE.getKey());
            }
            return this;
        }
Sets database name.

@param database database name, null means {@link ClickHouseDefaults#DATABASE}
@return this builder
clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseNode.java