# Interface ShardingKey

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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