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

com.sleepycat.db.Environment.beginTransaction()
Create a new transaction in the database environment.
Transactions may only span threads if they do so serially; that is, each transaction must be active in only a single thread of control at a time.
This restriction holds for parents of nested transactions as well; no two children may be concurrently active in more than one thread of control at any one time.
Cursors may not span transactions; that is, each cursor must be opened and closed within a single transaction.
A parent transaction may not issue any Berkeley DB operations -- except for {@link com.sleepycat.db.Environment#beginTransaction Environment.beginTransaction}, {@link com.sleepycat.db.Transaction#abort Transaction.abort} and {@link com.sleepycat.db.Transaction#commit Transaction.commit} --while it has active child transactions (child transactions that have not yet been committed or aborted).
@param parent If the parent parameter is non-null, the new transaction will be a nested transaction, with the transaction indicated by parent as its parent. Transactions may be nested to any level. In the presence of distributed transactions and two-phase commit, only the parental transaction, that is a transaction without a parent specified, should be passed as an parameter to {@link com.sleepycat.db.Transaction#prepare Transaction.prepare}.
@param config The transaction attributes. If null, default attributes are used.
@return The newly created transaction's handle.
@throws DatabaseException if a failure occurs.

        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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        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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                    throw new IllegalStateException(
                            "Nested transactions are not supported");
                }
                Transaction parentTxn = trans.txn;
                trans = new Trans(trans, config);
                trans.txn = env.beginTransaction(parentTxn, config);
                localTrans.set(trans);
            } else {
                trans.txn = env.beginTransaction(null, config);
                trans.config = config;
            }

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                Transaction parentTxn = trans.txn;
                trans = new Trans(trans, config);
                trans.txn = env.beginTransaction(parentTxn, config);
                localTrans.set(trans);
            } else {
                trans.txn = env.beginTransaction(null, config);
                trans.config = config;
            }
        } else {
            trans = new Trans(null, config);
            trans.txn = env.beginTransaction(null, config);

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                trans.txn = env.beginTransaction(null, config);
                trans.config = config;
            }
        } else {
            trans = new Trans(null, config);
            trans.txn = env.beginTransaction(null, config);
            localTrans.set(trans);
        }
        return trans.txn;
    }

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