public DBAggregationQueryConfigurationEntry lookupEntry(String dbName) {
            List<DBAggregationQueryConfigurationEntry> dbResults = this.extractMatchingConfigEntries(
                    dbName.toLowerCase(Locale.ENGLISH));
            if (dbResults.isEmpty()) {
                return null;
            }
            return dbResults.get(0);
        }
RDBMS configuration mapping class to be used to lookup matching configuration entry with a data source.
modules/siddhi-core/src/main/java/io/siddhi/core/aggregation/persistedaggregation/config/DBAggregationQueryUtil.java