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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