Examples of com.sleepycat.je.Environment.beginTransaction()

com.sleepycat.je.Environment.beginTransaction()
Creates a new transaction in the database environment.
Transaction handles are free-threaded; transactions handles may be used concurrently by multiple threads.

Cursors may not span transactions; that is, each cursor must be opened and closed within a single transaction. The parent parameter is a placeholder for nested transactions, and must currently be null.
@param txnConfig The transaction attributes. If null, defaultattributes are used. @return The newly created transaction's handle. @throws com.sleepycat.je.rep.InsufficientReplicasException if the Masterin a replicated environment could not contact a quorum of replicas as determined by the {@link ReplicaAckPolicy}. @throws com.sleepycat.je.rep.ReplicaConsistencyException if a replicain a replicated environment cannot become consistent within the timeout period. @throws EnvironmentFailureException if an unexpected, internal orenvironment-wide failure occurs. @throws UnsupportedOperationException if this is not a transactionalenvironment. @throws IllegalStateException if this handle or the underlyingenvironment has been closed. @throws IllegalArgumentException if an invalid parameter is specified,for example, an invalid {@code TransactionConfig} parameter.

                MyData data = new MyData(i, stars.toString());


                IntegerBinding.intToEntry(i, keyEntry);
                dataBinding.objectToEntry(data, dataEntry);


                txn = exampleEnv.beginTransaction(null, null);
                OperationStatus status =
                    exampleDb.put(txn, keyEntry, dataEntry);


                /*
                 * Note that put will throw a DatabaseException when

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        /* 
         * Make a database within that environment. Because this will be used
         * as a primary database, it must not allow duplicates. The primary key
         * of a primary database must be unique.
         */
        Transaction txn = exampleEnv.beginTransaction(null, null);
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setTransactional(true); 
        dbConfig.setAllowCreate(true);
        Database exampleDb =
      exampleEnv.openDatabase(txn, "bindingsDb", dbConfig);

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             * to add data.  Adding or changing data in the secondary database
             * is not allowed; however, deleting through the secondary database
             * is allowed.
             */
            for (int i = offset; i < numRecords + offset; i++) {
                txn = exampleEnv.beginTransaction(null, null);
                StringBuffer stars = new StringBuffer();
                for (int j = 0; j < i; j++) {
                    stars.append('*');
                }
                MyData data = new MyData(i, stars.toString());

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       * data of the primary database.  You can cast the cursor to a
       * SecondaryCursor and use additional method signatures for
       * retrieving the primary key also.  Or you can call
       * openSecondaryCursor() to avoid casting.
       */
            txn = exampleEnv.beginTransaction(null, null);
            Cursor cursor = exampleSecDb.openCursor(txn, null);


            while (cursor.getNext(keyEntry, dataEntry, LockMode.DEFAULT) ==
                   OperationStatus.SUCCESS) {

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        boolean autoCommit = false;
        Environment env = db.getEnvironment();
        if (transactional &&
            txn == null &&
            DbCompat.getThreadTransaction(env) == null) {
            txn = env.beginTransaction(null, null);
            autoCommit = true;
        }


        boolean failed = true;
        OperationStatus status;

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        boolean autoCommit = false;
        Environment env = db.getEnvironment();
        if (transactional &&
            txn == null &&
            DbCompat.getThreadTransaction(env) == null) {
            txn = env.beginTransaction(null, null);
            autoCommit = true;
        }


        boolean failed = true;
        Cursor cursor = db.openCursor(txn, null);

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  private void execute(Operation... operations)
  {
    Environment env = this.pool.take();
    try
    {
      Transaction transaction = env.beginTransaction(null, null);
      for (Operation operation: operations)
      {
        operation.execute(env, transaction);
      }
    }

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        Environment env = new Environment(envDir, envConfig);
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setReadOnly(true);
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(false);
        Transaction txn = env.beginTransaction(null, null);
        Database db = env.openDatabase(txn, DbTree.REP_GROUP_DB_NAME, dbConfig);


        DatabaseEntry groupEntry = new DatabaseEntry();
        OperationStatus status =
            db.get(txn, groupKeyEntry, groupEntry, LockMode.READ_COMMITTED);

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