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Using Sorted Collections
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Using Sorted Collections
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<p>
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.
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<p>
In addition to using the tuple format, the
<a class="ulink" href="../../java/com/sleepycat/db/DatabaseType.html#BTREE" target="_top">DatabaseType.BTREE</a>
access method must be used when creating the database.
<a class="ulink" href="../../java/com/sleepycat/db/DatabaseType.html#BTREE" target="_top">DatabaseType.BTREE</a>
is used for the databases in all examples. The
<a class="ulink" href="../../java/com/sleepycat/db/DatabaseType.html#HASH" target="_top">DatabaseType.HASH</a>
access method does not support sorted keys.
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<p>
Although not shown in the example, all methods of the
<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/SortedMap.html" target="_top">SortedMap</a>
and
<a class="ulink" href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/SortedSet.html" target="_top">SortedSet</a>
interfaces may be used with sorted collections. For example,
submaps and subsets may be created.
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<p>
The output of the example program shows that records are sorted
by key value.
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<pre class="programlisting">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 </pre>
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