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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