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In general, no changes to the prior example are necessary to use collections having tuple keys. Iteration of elements in a stored collection will be ordered by the sort order of the tuples.
In addition to using the tuple format, the DatabaseType.BTREE access method must be used when creating the database. DatabaseType.BTREE is used for the databases in all examples. The DatabaseType.HASH access method does not support sorted keys.
Although not shown in the example, all methods of the SortedMap and SortedSet interfaces may be used with sorted collections. For example, submaps and subsets may be created.
The output of the example program shows that records are sorted by key value.
Adding Suppliers Adding Parts Adding Shipments --- Parts --- Part: number=P1 name=Nut color=Red weight=[12.0 grams] city=London Part: number=P2 name=Bolt color=Green weight=[17.0 grams] city=Paris Part: number=P3 name=Screw color=Blue weight=[17.0 grams] city=Rome Part: number=P4 name=Screw color=Red weight=[14.0 grams] city=London Part: number=P5 name=Cam color=Blue weight=[12.0 grams] city=Paris Part: number=P6 name=Cog color=Red weight=[19.0 grams] city=London --- Suppliers --- Supplier: number=S1 name=Smith status=20 city=London Supplier: number=S2 name=Jones status=10 city=Paris Supplier: number=S3 name=Blake status=30 city=Paris Supplier: number=S4 name=Clark status=20 city=London Supplier: number=S5 name=Adams status=30 city=Athens --- Suppliers for City Paris --- Supplier: number=S2 name=Jones status=10 city=Paris Supplier: number=S3 name=Blake status=30 city=Paris --- Shipments --- Shipment: part=P1 supplier=S1 quantity=300 Shipment: part=P1 supplier=S2 quantity=300 Shipment: part=P2 supplier=S1 quantity=200 Shipment: part=P2 supplier=S2 quantity=400 Shipment: part=P2 supplier=S3 quantity=200 Shipment: part=P2 supplier=S4 quantity=200 Shipment: part=P3 supplier=S1 quantity=400 Shipment: part=P4 supplier=S1 quantity=200 Shipment: part=P4 supplier=S4 quantity=300 Shipment: part=P5 supplier=S1 quantity=100 Shipment: part=P5 supplier=S4 quantity=400 Shipment: part=P6 supplier=S1 quantity=100 --- Shipments for Part P1 --- Shipment: part=P1 supplier=S1 quantity=300 Shipment: part=P1 supplier=S2 quantity=300 --- Shipments for Supplier S1 --- Shipment: part=P1 supplier=S1 quantity=300 Shipment: part=P2 supplier=S1 quantity=200 Shipment: part=P3 supplier=S1 quantity=400 Shipment: part=P4 supplier=S1 quantity=200 Shipment: part=P5 supplier=S1 quantity=100 Shipment: part=P6 supplier=S1 quantity=100