Module java.sql
Package java.sql

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();
     
     
    Since:
    9

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