Examples of com.sleepycat.je.DatabaseConfig

com.sleepycat.je.DatabaseConfig

Specifies the attributes of a database.

There are two groups of database attributes: per-database handle attributes, and database-wide attributes. An attribute may be persistent/transient or mutable/immutable:

Scope	Mutable	Persistent	Attribute
Database-wide attribute	True	True	{@link DatabaseConfig#getBtreeComparator() btree comparator} {@link DatabaseConfig#getDuplicateComparator() duplicate comparator} {@link DatabaseConfig#getKeyPrefixing() key prefixing} {@link DatabaseConfig#getNodeMaxEntries() nodeMaxEntries}
	True	False	{@link DatabaseConfig#getDeferredWrite() deferred write} {@link DatabaseConfig#getTransactional() transactional}
	False	True	{@link DatabaseConfig#getSortedDuplicates() sorted duplicates}
	False	False	{@link DatabaseConfig#getTemporary() temporary}
Per-database handle attributes	False	False	{@link DatabaseConfig#getAllowCreate() allow create} {@link DatabaseConfig#getExclusiveCreate() exclusive create} {@link DatabaseConfig#getReadOnly() read only} {@link DatabaseConfig#getUseExistingConfig() use existing config}

Persistent attributes will be saved in the log and remain in effect every time the environment is reopened. Transient attributes only remain in effect until:

the database configuration is updated
the database handle(per-database handle attributes) is closed, or all handles for this database (database-wide attributes) are closed.


    private Database openDatabase(boolean allowDuplicates, String name,
                                  boolean readOnly)
        throws DatabaseException {


        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(isTransactional);
        dbConfig.setAllowCreate(true);
        dbConfig.setSortedDuplicates(allowDuplicates);
        dbConfig.setReadOnly(readOnly);
        Transaction txn = txnBegin();
        Database priDb;
        try {
            priDb = env.openDatabase(txn, name, dbConfig);
        } finally {

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        }
        db = database;
        try {
            currentTxn =
                CurrentTransaction.getInstanceInternal(db.getEnvironment());
            DatabaseConfig dbConfig;
            if (db instanceof SecondaryDatabase) {
                secDb = (SecondaryDatabase) database;
                SecondaryConfig secConfig = secDb.getSecondaryConfig();
                secKeyCreator = secConfig.getKeyCreator();
                dbConfig = secConfig;
            } else {
                dbConfig = db.getConfig();
            }
            ordered = !DbCompat.isTypeHash(dbConfig);
            recNumAllowed = DbCompat.isTypeQueue(dbConfig) ||
                            DbCompat.isTypeRecno(dbConfig) ||
                            DbCompat.getBtreeRecordNumbers(dbConfig);
            recNumRenumber = DbCompat.getRenumbering(dbConfig);
            dupsAllowed = DbCompat.getSortedDuplicates(dbConfig) ||
                          DbCompat.getUnsortedDuplicates(dbConfig);
            dupsOrdered = DbCompat.getSortedDuplicates(dbConfig);
            transactional = currentTxn.isTxnMode() &&
                            dbConfig.getTransactional();
            readUncommittedAllowed = DbCompat.getReadUncommitted(dbConfig);
            btreeRecNumDb = recNumAllowed && DbCompat.isTypeBtree(dbConfig);
            range = new KeyRange(dbConfig.getBtreeComparator());
        } catch (DatabaseException e) {
            throw new RuntimeExceptionWrapper(e);
        }
        this.writeAllowed = writeAllowed;
        this.keyBinding = keyBinding;

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    }


    private Database openDb(String file)
        throws Exception {


        DatabaseConfig config = new DatabaseConfig();
        config.setTransactional(testEnv.isTxnMode());
        config.setAllowCreate(true);


        return DbCompat.openDatabase(env, null, file, null, config);
    }

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        throws DatabaseException {


        /* Make a db and open it. */
        dbs = new Database[numDbs];


        DatabaseConfig dbConfig = new DatabaseConfig();
  if (btreeComparisonFunction != null) {
      dbConfig.setBtreeComparator(btreeComparisonFunction.getClass());
  }
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(true);
        dbConfig.setSortedDuplicates(true);
        for (int i = 0; i < numDbs; i++) {
            dbs[i] = env.openDatabase(txn, DB_NAME + i, dbConfig);
        }
    }

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        /* Generate an expected count map. */
        Map countMap = generateCountMap(expectedData);


        /* Check each db in turn. */
        DatabaseConfig dbConfig = new DatabaseConfig();
  if (btreeComparisonFunction != null) {
      dbConfig.setBtreeComparator(btreeComparisonFunction.getClass());
  }
        dbConfig.setTransactional(env.getConfig().getTransactional());
        dbConfig.setSortedDuplicates(true);
        dbConfig.setReadOnly(true);
        for (int d = startDb; d < endDb; d++) {
            Database checkDb = env.openDatabase(null, DB_NAME + d,
            dbConfig);
            Cursor myCursor = checkDb.openCursor(null, null);
            DatabaseEntry key = new DatabaseEntry();

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     * Print the contents of the databases out for debugging
     */
    protected void dumpData(int numDbs)
        throws DatabaseException {


        DatabaseConfig dbConfig = new DatabaseConfig();
  if (btreeComparisonFunction != null) {
      dbConfig.setBtreeComparator(btreeComparisonFunction.getClass());
  }
        dbConfig.setSortedDuplicates(true);
  dbConfig.setTransactional(true);
        for (int d = 0; d < numDbs; d++) {
            Database checkDb = env.openDatabase(null, DB_NAME + d, dbConfig);
            Cursor myCursor = checkDb.openCursor(null, null);
            DatabaseEntry key = new DatabaseEntry();
            DatabaseEntry data = new DatabaseEntry();

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    }


    private Database openDb(String file, boolean create)
        throws Exception {


        DatabaseConfig config = new DatabaseConfig();
        DbCompat.setTypeBtree(config);
        config.setTransactional(testEnv.isTxnMode());
        config.setAllowCreate(create);


        return DbCompat.openDatabase(env, null, file, null, config);
    }

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    }


    private Database openDb(String file)
        throws Exception {


        DatabaseConfig config = new DatabaseConfig();
        DbCompat.setTypeBtree(config);
        config.setTransactional(testEnv.isTxnMode());
        config.setAllowCreate(true);


        return DbCompat.openDatabase(env, null, file, null, config);
    }

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        this.envImpl = env;
        idDatabase = new DatabaseImpl(ID_DB_NAME,
              new DatabaseId(0),
              env,
              new DatabaseConfig());
                                  
        nameDatabase = new DatabaseImpl(NAME_DB_NAME,
          new DatabaseId(1),
          env,
          new DatabaseConfig());
                                  
        lastAllocatedDbId = 1;
    }

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    }


    public void testCursorDupAndCloseDb()
  throws DatabaseException {
        initEnv(false);
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setAllowCreate(true);
        Database myDb = exampleEnv.openDatabase(null, "fooDb", dbConfig);


  myDb.put(null, new StringDbt("blah"), new StringDbt("blort"));
  Cursor cursor = myDb.openCursor(null, null);
  OperationStatus status = cursor.getNext(new DatabaseEntry(),

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