code: public void setDatabaseShardingValue(final Comparable<?> value) {
          databaseShardingValues.clear();
          databaseShardingValues.put("", value);
          databaseShardingOnly = true;
      }
docs: Set sharding value for database sharding only.
  
  <p>The sharding operator is {@code =}</p>
  
  @param value sharding value