public interface ShardingKey
Interface used to indicate that this object represents a Sharding Key. A
 
ShardingKey instance is only guaranteed to be compatible with the
 data source instance that it was derived from. A ShardingKey is
 created using ShardingKeyBuilder.
 
 The following example illustrates the use of ShardingKeyBuilder to
 create a ShardingKey:
 
 
     DataSource ds = new MyDataSource();
     ShardingKey shardingKey = ds.createShardingKeyBuilder()
                           .subkey("abc", JDBCType.VARCHAR)
                           .subkey(94002, JDBCType.INTEGER)
                           .build();
 
 
 
 A ShardingKey may also be used for specifying a
 superShardingKey. Databases that support composite Sharding may use a
 superShardingKey to specify a additional level of partitioning within
 the Shard.
 
 The following example illustrates the use of ShardingKeyBuilder to
 create a superShardingKey for an eastern region with a
 ShardingKey specified for the Pittsburgh branch office:
 
 
     DataSource ds = new MyDataSource();
     ShardingKey superShardingKey = ds.createShardingKeyBuilder()
                           .subkey("EASTERN_REGION", JDBCType.VARCHAR)
                           .build();
     ShardingKey shardingKey = ds.createShardingKeyBuilder()
                           .subkey("PITTSBURGH_BRANCH", JDBCType.VARCHAR)
                           .build();
     Connection con = ds.createConnectionBuilder()
                           .superShardingKey(superShardingKey)
                           .shardingKey(shardingKey)
                           .build();
 
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