C# BerkeleyDB.BTreeDatabase类代码示例

        public void GetSecCursor(BTreeDatabase db,
		    string secFileName, SecondaryKeyGenDelegate keyGen,
		    out SecondaryBTreeDatabase secDB,
		    out SecondaryCursor cursor, bool ifCfg,
		    DatabaseEntry data)
        {
            // Open secondary database.
            SecondaryBTreeDatabaseConfig secCfg =
                new SecondaryBTreeDatabaseConfig(db, keyGen);
            secCfg.Creation = CreatePolicy.IF_NEEDED;
            secCfg.Duplicates = DuplicatesPolicy.SORTED;
            secDB = SecondaryBTreeDatabase.Open(secFileName, secCfg);

            int[] intArray = new int[4];
            intArray[0] = 0;
            intArray[1] = 1;
            intArray[2] = 2049;
            intArray[3] = 65537;
            for (int i = 0; i < 4; i++)
            {
                DatabaseEntry record = new DatabaseEntry(
                    BitConverter.GetBytes(intArray[i]));
                db.Put(record, record);
            }

            // Get secondary cursor on the secondary database.
            if (ifCfg == false)
                cursor = secDB.SecondaryCursor();
            else
                cursor = secDB.SecondaryCursor(new CursorConfig());

            // Position the cursor.
            if (data != null)
                Assert.IsTrue(cursor.Move(data, true));
        }

        private void OpenBase()
        {
            var pathStr = Environment.GetEnvironmentVariable("PATH");

            var pwd = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            pwd = Path.Combine(pwd, IntPtr.Size == 4 ? "x86" : "x64");
            if (pathStr != null && !pathStr.Contains(pwd))
            {
                pwd += ";" + Environment.GetEnvironmentVariable("PATH");
                Environment.SetEnvironmentVariable("PATH", pwd);
            }


            _btreeConfig = new BTreeDatabaseConfig
            {
                Duplicates = DuplicatesPolicy.NONE,
                ErrorPrefix = "QH_" + Path.GetFileName(_dbPAth),
                Creation = CreatePolicy.IF_NEEDED,
                FreeThreaded = true
            };

            if (_env != null)
            {
                _btreeConfig.Env = _env;
            }

            _btreeDb = BTreeDatabase.Open(_dbPAth, _name, _btreeConfig);
        }

        // Get a cursor in CDS.
        public static void GetCursorInBtreeDBInCDS(
            string home, string name,
            CursorConfig cursorConfig,
            out DatabaseEnvironment env, out BTreeDatabase db,
            out BTreeCursor cursor)
        {
            string dbFileName = name + ".db";

            // Open an environment.
            DatabaseEnvironmentConfig envConfig =
                new DatabaseEnvironmentConfig();
            envConfig.Create = true;
            envConfig.UseCDB = true;
            envConfig.UseMPool = true;
            env = DatabaseEnvironment.Open(home, envConfig);

            /*
             * Open an btree database. The underlying database
             * should be opened with ReadUncommitted if the
             * cursor's isolation degree will be set to be 1.
             */
            BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            dbConfig.Env = env;

            if (cursorConfig.IsolationDegree == Isolation.DEGREE_ONE)
                dbConfig.ReadUncommitted = true;

            db = BTreeDatabase.Open(dbFileName, dbConfig);

            // Get a cursor in the transaction.
            cursor = db.Cursor(cursorConfig);
        }

        public void GetCursorInBtreeDBUsingRecno(string home,
		    string name, out BTreeDatabase db,
		    out BTreeCursor cursor)
        {
            string dbFileName = home + "/" + name + ".db";
            BTreeDatabaseConfig dbConfig = new BTreeDatabaseConfig();
            dbConfig.UseRecordNumbers = true;
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            db = BTreeDatabase.Open(dbFileName, dbConfig);
            cursor = db.Cursor();
        }

        public override void Init(int flowCount, long flowRecordCount)
        {
            BTreeDatabaseConfig config = new BTreeDatabaseConfig();

            config.Creation = CreatePolicy.IF_NEEDED;
            config.CacheSize = new CacheInfo(5, 0, 2);
            config.PageSize = 8 * 1024;
            config.BTreeCompare = new EntryComparisonDelegate(CompareFunctionKeyByteArray);
            config.Duplicates = DuplicatesPolicy.NONE;

            string fileName = Path.Combine(DataDirectory, string.Format("{0}.oracle", CollectionName));
            database = BTreeDatabase.Open(fileName, config);
        }

        public void OpenBtreeDBInEnv(string dbName,
		    DatabaseEnvironment env, out BTreeDatabase db,
		    bool create, Transaction txn)
        {
            BTreeDatabaseConfig btreeDBConfig =
                new BTreeDatabaseConfig();
            btreeDBConfig.Env = env;
            if (create == true)
                btreeDBConfig.Creation = CreatePolicy.IF_NEEDED;
            else
                btreeDBConfig.Creation = CreatePolicy.NEVER;
            if (txn == null)
                db = BTreeDatabase.Open(dbName,
                    btreeDBConfig);
            else
                db = BTreeDatabase.Open(dbName,
                    btreeDBConfig, txn);
        }

        public void OpenPrimaryAndSecondaryDB(string dbFileName,
		    out BTreeDatabase primaryDB,
		    out SecondaryBTreeDatabase secDB)
        {
            // Open primary database.
            BTreeDatabaseConfig primaryDBConfig =
                new BTreeDatabaseConfig();
            primaryDBConfig.Creation = CreatePolicy.IF_NEEDED;
            primaryDB =
                BTreeDatabase.Open(dbFileName, primaryDBConfig);

            // Open secondary database.
            SecondaryBTreeDatabaseConfig secDBConfig =
                new SecondaryBTreeDatabaseConfig(primaryDB,
                new SecondaryKeyGenDelegate(SecondaryKeyGen));
            secDB = SecondaryBTreeDatabase.Open(dbFileName,
                secDBConfig);
        }

        public static void Confirm(XmlElement xmlElem,
		    BTreeDatabase btreeDB, bool compulsory)
        {
            DatabaseTest.Confirm(xmlElem, btreeDB, compulsory);
            Configuration.ConfirmDuplicatesPolicy(xmlElem,
                "Duplicates", btreeDB.Duplicates, compulsory);
            Configuration.ConfirmUint(xmlElem, "MinKeysPerPage",
                btreeDB.MinKeysPerPage, compulsory);
            /*
             * BTreeDatabase.RecordNumbers is the value of
             * BTreeDatabaseConfig.UseRecordNumbers.
             */
            Configuration.ConfirmBool(xmlElem, "UseRecordNumbers",
                btreeDB.RecordNumbers, compulsory);
            /*
             * BTreeDatabase.ReverseSplit is the value of
             * BTreeDatabaseConfig.NoReverseSplitting.
             */
            Configuration.ConfirmBool(xmlElem, "NoReverseSplitting",
                btreeDB.ReverseSplit, compulsory);
            Assert.AreEqual(DatabaseType.BTREE, btreeDB.Type);
            string type = btreeDB.ToString();
            Assert.IsNotNull(type);
        }

        public void OpenNewSequenceInEnv(string home, string dbname,
		    out DatabaseEnvironment env, out BTreeDatabase db,
		    out Sequence seq)
        {
            DatabaseEnvironmentConfig envConfig =
                new DatabaseEnvironmentConfig();
            envConfig.Create = true;
            envConfig.UseTxns = true;
            envConfig.UseMPool = true;
            envConfig.UseLogging = true;
            env = DatabaseEnvironment.Open(home, envConfig);

            Transaction openTxn = env.BeginTransaction();
            BTreeDatabaseConfig dbConfig =
                new BTreeDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            dbConfig.Env = env;
            db = BTreeDatabase.Open(dbname + ".db", dbConfig,
                openTxn);
            openTxn.Commit();

            Transaction seqTxn = env.BeginTransaction();
            SequenceConfig seqConfig = new SequenceConfig();
            seqConfig.BackingDatabase = db;
            seqConfig.Creation = CreatePolicy.ALWAYS;
            seqConfig.Decrement = false;
            seqConfig.FreeThreaded = true;
            seqConfig.Increment = true;
            seqConfig.InitialValue = 0;
            seqConfig.key = new DatabaseEntry(
                ASCIIEncoding.ASCII.GetBytes("key"));
            seqConfig.SetRange(Int64.MinValue, Int64.MaxValue);
            seqConfig.Wrap = true;
            seq = new Sequence(seqConfig);
            seqTxn.Commit();
        }

        public void OpenNewSequence(string dbFileName,
		    out BTreeDatabase db, out Sequence seq)
        {
            // Open a database.
            BTreeDatabaseConfig btreeDBConfig =
                new BTreeDatabaseConfig();
            btreeDBConfig.Creation = CreatePolicy.IF_NEEDED;
            db = BTreeDatabase.Open(dbFileName, btreeDBConfig);

            // Configure and initialize sequence.
            SequenceConfig seqConfig = new SequenceConfig();
            seqConfig.BackingDatabase = db;
            seqConfig.CacheSize = 1000;
            seqConfig.Creation = CreatePolicy.ALWAYS;
            seqConfig.Decrement = false;
            seqConfig.FreeThreaded = true;
            seqConfig.Increment = true;
            seqConfig.InitialValue = 100;
            seqConfig.key = new DatabaseEntry(
                ASCIIEncoding.ASCII.GetBytes("key"));
            seqConfig.SetRange(Int64.MinValue, Int64.MaxValue);
            seqConfig.Wrap = true;
            seq = new Sequence(seqConfig);
        }

        /*
         * Configure a transactional cursor to have degree 1
         * isolation. The cursor's read operations could return
         * modified but not yet commited data.
         */
        public void CursorReadUncommited(
		    DatabaseEnvironment env, BTreeDatabase db,
		    Cursor cursor, Transaction txn)
        {
            Console.WriteLine("CursorReadUncommited");
        }

        public static void GetCursorInBtreeDBWithoutEnv(
		    string home, string name, out BTreeDatabase db,
		    out BTreeCursor cursor)
        {
            string dbFileName = home + "/" + name + ".db";

            BTreeDatabaseConfig dbConfig =
                new BTreeDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            dbConfig.Duplicates = DuplicatesPolicy.UNSORTED;
            db = BTreeDatabase.Open(dbFileName, dbConfig);
            cursor = db.Cursor();
        }

        public void TestSnapshotIsolation()
        {
            BTreeDatabaseConfig dbConfig;
            DatabaseEntry key, data;
            DatabaseEnvironmentConfig envConfig;
            Thread readThread, updateThread;
            Transaction txn;

            updateTxn = null;
            readTxn = null;
            paramDB = null;
            paramEnv = null;
            testName = "TestSnapshotIsolation";
            testHome = testFixtureHome + "/" + testName;

            Configuration.ClearDir(testHome);

            /*
             * Open environment with DB_MULTIVERSION
             * which is required by DB_TXN_SNAPSHOT.
             */
            envConfig = new DatabaseEnvironmentConfig();
            envConfig.Create = true;
            envConfig.UseMVCC = true;
            envConfig.UseTxns = true;
            envConfig.UseMPool = true;
            envConfig.UseLocking = true;
            envConfig.TxnTimeout = 1000;
            paramEnv = DatabaseEnvironment.Open(
                testHome, envConfig);
            paramEnv.DetectDeadlocks(DeadlockPolicy.YOUNGEST);

            /*
             * Open a transactional database and put 1000 records
             * into it within transaction.
             */
            txn = paramEnv.BeginTransaction();
            dbConfig = new BTreeDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            dbConfig.UseMVCC = true;
            dbConfig.Env = paramEnv;
            paramDB = BTreeDatabase.Open(
                testName + ".db", dbConfig, txn);
            for (int i = 0; i < 256; i++)
            {
                key = new DatabaseEntry(
                    BitConverter.GetBytes(i));
                data = new DatabaseEntry(
                    BitConverter.GetBytes(i));
                paramDB.Put(key, data, txn);
            }
            txn.Commit();

            /*
             * Begin two threads, read and update thread.
             * The update thread runs a update transaction
             * using full read/write locking. The read thread
             * set DB_TXN_SNAPSHOT on read-only cursor.
             */
            readThread = new Thread(new ThreadStart(ReadTxn));
            updateThread = new Thread(new ThreadStart(UpdateTxn));
            updateThread.Start();
            Thread.Sleep(1000);
            readThread.Start();
            readThread.Join();
            updateThread.Join();

            // Commit transacion in both two threads.
            if (updateTxn != null)
                updateTxn.Commit();
            if (readTxn != null)
                readTxn.Commit();

            /*
             * Confirm that the overwrite operation works.
             */
            ConfirmOverwrite();

            paramDB.Close();
            paramEnv.Close();
        }

        public MyDbs(string databaseHome)
        {
            vDbName = "vendordb.db";
            iDbName = "inventorydb.db";
            itemSDbName = "itemname.sdb";

            if (databaseHome != null) {
                vDbName = databaseHome + "\\" + vDbName;
                iDbName = databaseHome + "\\" + iDbName;
                itemSDbName = databaseHome + "\\" + itemSDbName;
            }

            btreeConfig = new BTreeDatabaseConfig();
            btreeConfig.Creation = CreatePolicy.IF_NEEDED;
            btreeConfig.CacheSize = new CacheInfo(0, 64 * 1024, 1);
            btreeConfig.ErrorPrefix = "excs_getting_started";
            btreeConfig.PageSize = 8 * 1024;

            /* Optionally remove existing database files. */
            try {
                RemoveDbFile(vDbName);
                RemoveDbFile(iDbName);
                RemoveDbFile(itemSDbName);
            } catch (Exception e) {
                Console.WriteLine("Error deleting db.");
                Console.WriteLine(e.Message);
                throw e;
            }

            /* Create and open the Inventory and Vendor database files. */
            try {
                vbtreeDB = BTreeDatabase.Open(vDbName, btreeConfig);
            } catch (Exception e) {
                Console.WriteLine("Error opening {0}.", vDbName);
                Console.WriteLine(e.Message);
                throw e;
            }

            try {
                ibtreeDB = BTreeDatabase.Open(iDbName, btreeConfig);
            } catch (Exception e) {
                Console.WriteLine("Error opening {0}.", iDbName);
                Console.WriteLine(e.Message);
                throw e;
            }

            /*
             * Open a secondary btree database associated with the
             * Inventory database.
             */
            try {
                itemSecbtreeConfig = new SecondaryBTreeDatabaseConfig(
                    ibtreeDB, new SecondaryKeyGenDelegate(
                    CreateSecondaryKey));

                itemSecbtreeConfig.Creation = CreatePolicy.IF_NEEDED;
                itemSecbtreeConfig.Duplicates = DuplicatesPolicy.UNSORTED;
                itemSecbtreeDB = SecondaryBTreeDatabase.Open(
                    itemSDbName, itemSecbtreeConfig);
            } catch (Exception e) {
                Console.WriteLine("Error opening secondary {0}", itemSDbName);
                Console.WriteLine(e.Message);
                throw e;
            }
        }

        public void TestLockAndUnlockMutex()
        {
            testName = "TestLockAndUnlockMutex";
            SetUpTest(true);

            /*
             * Open an environment without locking and
             * deadlock detection.
             */
            DatabaseEnvironmentConfig envConfig =
                new DatabaseEnvironmentConfig();
            envConfig.FreeThreaded = true;
            envConfig.UseLogging = true;
            envConfig.Create = true;
            envConfig.UseMPool = true;
            DatabaseEnvironment env = DatabaseEnvironment.Open(
                testHome, envConfig);

            // Open a database.
            BTreeDatabaseConfig dbConfig =
                new BTreeDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            dbConfig.Env = env;
            TestDB = BTreeDatabase.Open(
                testName + ".db", dbConfig);

            // Get a mutex which will be used in two threads.
            TestMutex = env.GetMutex(true, false);

            // Begin two threads to write records into database.
            Thread mutexThread1 = new Thread(
                new ThreadStart(MutexThread1));
            Thread mutexThread2 = new Thread(
                new ThreadStart(MutexThread2));
            mutexThread1.Start();
            mutexThread2.Start();
            mutexThread1.Join();
            mutexThread2.Join();

            // Free the mutex.
            TestMutex.Dispose();

            // Close all.
            TestDB.Close();
            env.Close();
        }