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.

        return _environment;
    }


    private void openDatabases() throws DatabaseException
    {
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(true);


        //This is required if we are wanting read only access.
        dbConfig.setReadOnly(false);


        _configuredObjectsDb = openDatabase(CONFIGURED_OBJECTS, dbConfig);
        _messageMetaDataDb = openDatabase(MESSAGEMETADATADB_NAME, dbConfig);
        _messageContentDb = openDatabase(MESSAGECONTENTDB_NAME, dbConfig);
        _deliveryDb = openDatabase(DELIVERYDB_NAME, dbConfig);

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        //envMutableConfig.setDurability(Durability.COMMIT_SYNC);
        //envMutableConfig.setDurability(Durability.COMMIT_NO_SYNC);
        envMutableConfig.setDurability(Durability.COMMIT_WRITE_NO_SYNC);
        dbEnv.setMutableConfig(envMutableConfig);


        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setAllowCreate(true);
        //dbConfig.setDeferredWrite(true);
        db = dbEnv.openDatabase(null, "revs", dbConfig);


        head = dbEnv.openDatabase(null, "head", dbConfig);

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        _upgrader = new Upgrader(_environment, getVirtualHostName());
    }


    private int getStoreVersion(Environment environment)
    {
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(true);
        int storeVersion = -1;
        Database versionDb = null;
        Cursor cursor = null;
        try
        {

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        _upgrader = new Upgrader(_environment, getVirtualHostName());
    }


    private int getStoreVersion()
    {
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(true);
        int storeVersion = -1;
        Database versionDb = null;
        Cursor cursor = null;
        try
        {

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    } catch (Exception e) {
      // 打开失败, 删除原来的内容再重新打开一次
      deleteAll(dataDir);
      env = new Environment(dataDir, envConfig);
    }
    DatabaseConfig dbConfig = new DatabaseConfig();
    dbConfig.setAllowCreate(true);
    dbConfig.setTransactional(true);
    classCatalog = new StoredClassCatalog(env.openDatabase(null,
        DATABASE_CLASS_NAME, dbConfig));
    keyBinding = new SerialBinding<IMetaData[]>(classCatalog, IMetaData[].class);
    dataBinding = new SerialBinding<ICache>(classCatalog, ICache.class);
    dbMain = env.openDatabase(null, DATABASE_MAIN_NAME, dbConfig);

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        envConfig.setTransactional(true);
        envConfig.setAllowCreate(true);
        envConfig.setTxnNoSync(true);
        envConfig.setTxnWriteNoSync(true);


        final DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(true);


        this.environment = new Environment(this.dbHome.getFile(), envConfig);
        this.ticketDb = this.environment.openDatabase(null, "ticketDb",
            dbConfig);
        this.catalogDb = this.environment.openDatabase(null, "catalogDb",

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     * @throws DatabaseException
     */
    private void setup(File envHome, boolean readOnly) throws DatabaseException {


        EnvironmentConfig myEnvConfig = new EnvironmentConfig();
        dbConfig = new DatabaseConfig();


        // If the environment is read-only, then
        // make the databases read-only too.
        myEnvConfig.setReadOnly(readOnly);
        dbConfig.setReadOnly(readOnly);

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        }
    }


    private void openDatabases(boolean readonly) throws DatabaseException
    {
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(true);


        //This is required if we are wanting read only access.
        dbConfig.setReadOnly(readonly);


        _messageMetaDataDb = _environment.openDatabase(null, MESSAGEMETADATADB_NAME, dbConfig);
        _queueDb = _environment.openDatabase(null, QUEUEDB_NAME, dbConfig);
        _exchangeDb = _environment.openDatabase(null, EXCHANGEDB_NAME, dbConfig);
        _queueBindingsDb = _environment.openDatabase(null, QUEUEBINDINGSDB_NAME, dbConfig);

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    final EnvironmentConfig envConfig = new EnvironmentConfig();
    envConfig.setTransactional(true);
    envConfig.setAllowCreate(true);


    env = new Environment(dataDirectory, envConfig);
    final DatabaseConfig dbConfig = new DatabaseConfig();
    dbConfig.setTransactional(true);
    dbConfig.setAllowCreate(true);
    dbConfig.setSortedDuplicates(true);
    db = env.openDatabase(null, "nigori", dbConfig);
  }

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    }


    private Database openDb(String name, boolean duplicates)
        throws DatabaseException {


        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(isTransactional);
        dbConfig.setAllowCreate(true);
        dbConfig.setSortedDuplicates(duplicates);


        Transaction txn = txnBegin();
        try {
            return env.openDatabase(txn, name, dbConfig);
        } finally {

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