Examples of com.sleepycat.bdb.DataStore

com.sleepycat.bdb.DataStore

Represents a Berkeley DB database in the role of a primary data store. A store may be used by itself or along with one or more {@link DataIndex}objects. A store is typically accessed by passing it to the constructor of one of the collection classes in the {@link com.sleepycat.bdb.collection}package. For example:

 Db db = new Db(env, 0); db.open(null, "store.db", null, Db.DB_BTREE, dbOpenFlags, 0); DataStore store = new DataStore(db, keyFormat, valueFormat, keyAssigner); StoredMap map = new StoredMap(store, keyBinding, valueBinding, writeAllowed);

All access methods may be used with BDB. However, some access methods may only be used with certain types of collection views, and some access methods impose restrictions on the way collection views are used.

A store is always associated with the environment of its underlying database, which is the first parameter to the {Db#Db} constructor. There are three types of environments in Berkeley DB.

Environment	Access Mode	Berkeley DB Flags
Data Store	single-threaded access	Db.DB_INIT_MPOOL
Concurrent Data Store	single-writer multiple-reader access	Db.DB_INIT_CDB \| Db.DB_INIT_MPOOL
Transactional Data Store	transactional access for any number of readers and writers	Db.DB_INIT_TXN \| Db.DB_INIT_LOCK \| Db.DB_INIT_MPOOL

The flags shown are the minimum required for creating the Berkeley DB environment. Many other Berkeley DB options are also available. For details on creating and configuring the environment see the Berkeley DB documentation.

All three environments may be used within BDB. However, the Concurrent Data Store Environment imposes the restriction that only one writable cursor may be open at a time. This means that if you have a writable iterator for a data store open, then you cannot obtain another writable iterator for the same data store and you cannot perform other write operations through a collection for that data store (since this also uses a write cursor).

@author Mark Hayes


        SerialFormat keyFormat = new SerialFormat(catalog,
                                                  String.class);
        SerialFormat valueFormat = new SerialFormat(catalog,
                                                    TestSerial.class);
        store = new DataStore(openDb(STORE_FILE),
                              keyFormat, valueFormat, null);


        SerialBinding keyBinding = new SerialBinding(keyFormat);
        SerialBinding valueBinding = new SerialBinding(valueFormat);
        map = new StoredMap(store, keyBinding, valueBinding, true);

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        int envFlags = Db.DB_INIT_MPOOL | Db.DB_CREATE;
        env = new DbEnv(0);
        env.open(dir.getAbsolutePath(), envFlags, 0);
        Db db = new Db(env, 0);
        db.open(null, "test.db", null, Db.DB_BTREE, Db.DB_CREATE, 0);
        store = new DataStore(db, dataFormat, dataFormat, null);
        view = new DataView(store, null, dataBinding, dataBinding, null, true);
    }

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        // is not transactional because is not opened in a transaction
        //
        Db db = new Db(env, 0);
        db.open(null, null, null, Db.DB_BTREE, 0, 0);
        store = new DataStore(db, TestStore.BYTE_FORMAT,
                                  TestStore.BYTE_FORMAT, null);
        map = new StoredSortedMap(store,
                testStore.getKeyBinding(), testStore.getValueBinding(), true);
        assertTrue(!map.isTransactional());
        map.put(ONE, ONE);
        readCheck(map, ONE, ONE);
        store.close();


        // is transactional because is opened in a transaction
        //
        currentTxn.beginTxn();
        db = new Db(env, 0);
        db.open(currentTxn.getTxn(), null, null, Db.DB_BTREE, 0, 0);
        currentTxn.commitTxn();
        store = new DataStore(db, TestStore.BYTE_FORMAT,
                                  TestStore.BYTE_FORMAT, null);
        map = new StoredSortedMap(store,
                testStore.getKeyBinding(), testStore.getValueBinding(), true);
        assertTrue(map.isTransactional());
        currentTxn.beginTxn();

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                                map.keySet()));
        checkDirtyReadProperty(StoredCollections.dirtyReadSortedSet(
                                (SortedSet) map.keySet()));


        // create a list just so we can call dirtyReadList()
        DataStore listStore = TestStore.RECNO_RENUM.open(env, null);
        List list = new StoredList(listStore, TestStore.VALUE_BINDING, true);
        checkDirtyReadProperty(StoredCollections.dirtyReadList(list));
        listStore.close();


        doDirtyRead(dirtyMap);
    }

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     * key assignment is used.
     */
    public DataStore newDataStore(Db db, Class baseClass,
                                  PrimaryKeyAssigner keyAssigner) {


        return new DataStore(db, TUPLE_FORMAT,
                             new SerialFormat(catalog, baseClass),
                             keyAssigner);
    }

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        int fixedLen = (isQueueOrRecno() ? 1 : 0);
        Db db = openDb(env, fileName, fixedLen);
        PrimaryKeyAssigner keyAssigner =
            isQueueOrRecno() ?  null : getKeyAssigner();
        return new DataStore(db, keyFormat, BYTE_FORMAT, keyAssigner);
    }

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        // is not very useful. Duplicate keys are not allowed for any entity
        // with indexes or foreign key relationships.
        //
        Db partDb = new Db(env, 0);
        partDb.open(null, PART_STORE, null, Db.DB_BTREE, flags, 0);
        partStore = new DataStore(partDb, partKeyFormat,
                                  partValueFormat, null);


        Db supplierDb = new Db(env, 0);
        supplierDb.open(null, SUPPLIER_STORE, null, Db.DB_BTREE, flags, 0);
        supplierStore = new DataStore(supplierDb, supplierKeyFormat,
                                      supplierValueFormat, null);


        Db shipmentDb = new Db(env, 0);
        shipmentDb.open(null, SHIPMENT_STORE, null, Db.DB_BTREE, flags, 0);
        shipmentStore = new DataStore(shipmentDb, shipmentKeyFormat,
                                      shipmentValueFormat, null);


        // Create the KeyExtractor objects for the part and supplier
        // indices of the shipment store.  Each key extractor object defines
        // its associated index, since it is responsible for mapping between

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        // data format is used.  Duplicate keys are not allowed for any entity
        // with indexes or foreign key relationships.
        //
        Db partDb = new Db(env, 0);
        partDb.open(null, PART_STORE, null, Db.DB_BTREE, flags, 0);
        partStore = new DataStore(partDb, partKeyFormat,
                                  partValueFormat, null);


        Db supplierDb = new Db(env, 0);
        supplierDb.open(null, SUPPLIER_STORE, null, Db.DB_BTREE, flags, 0);
        supplierStore = new DataStore(supplierDb, supplierKeyFormat,
                                      supplierValueFormat, null);


        Db shipmentDb = new Db(env, 0);
        shipmentDb.open(null, SHIPMENT_STORE, null, Db.DB_BTREE, flags, 0);
        shipmentStore = new DataStore(shipmentDb, shipmentKeyFormat,
                                      shipmentValueFormat, null);


        // Create the KeyExtractor objects for the part and supplier
        // indices of the shipment store.  Each key extractor object defines
        // its associated index, since it is responsible for mapping between

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        SerialBinding valueBinding = new SerialBinding(valueFormat);


        // open a BTREE (sorted) data store
        Db db = new Db(env, 0);
        db.open(null, "data.db", null, Db.DB_BTREE, dbFlags, 0);
        this.store = new DataStore(db, keyFormat, valueFormat, null);


        // create a map view of the data store
        this.map = new StoredSortedMap(store, keyBinding, valueBinding, true);
    }

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        // is not very useful. Duplicate keys are not allowed for any entity
        // with indexes or foreign key relationships.
        //
        Db partDb = new Db(env, 0);
        partDb.open(null, PART_STORE, null, Db.DB_BTREE, flags, 0);
        partStore = new DataStore(partDb, partKeyFormat, partValueFormat,
                                  null);


        Db supplierDb = new Db(env, 0);
        supplierDb.open(null, SUPPLIER_STORE, null, Db.DB_BTREE, flags, 0);
        supplierStore = new DataStore(supplierDb, supplierKeyFormat,
                                      supplierValueFormat, null);


        Db shipmentDb = new Db(env, 0);
        shipmentDb.open(null, SHIPMENT_STORE, null, Db.DB_BTREE, flags, 0);
        shipmentStore = new DataStore(shipmentDb, shipmentKeyFormat,
                                      shipmentValueFormat, null);
    }

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Related Classes of com.sleepycat.bdb.DataStore

com.sleepycat.bdb.factory.TupleSerialDbFactory

com.sleepycat.bdb.serial.test.StoredClassCatalogTest

com.sleepycat.bdb.test.KeyRangeTest

com.sleepycat.bdb.test.TestStore

com.sleepycat.bdb.test.TransactionTest

com.sleepycat.examples.bdb.helloworld.HelloDatabaseWorld

com.sleepycat.examples.bdb.shipment.basic.SampleDatabase

com.sleepycat.examples.bdb.shipment.entity.SampleDatabase

com.sleepycat.examples.bdb.shipment.index.SampleDatabase

com.sleepycat.examples.bdb.shipment.marshal.SampleDatabase

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