C# BerkeleyDB.HashDatabaseConfig类代码示例

 public void ConfigCase1(HashDatabaseConfig dbConfig)
 {
     dbConfig.Creation = CreatePolicy.IF_NEEDED;
     dbConfig.Duplicates = DuplicatesPolicy.UNSORTED;
     dbConfig.FillFactor = 10;
     dbConfig.TableSize = 20;
     dbConfig.PageSize = 4096;
 }

        public void GetHashDBAndCursor(string home, string name, 
		    out HashDatabase db, out HashCursor cursor)
        {
            string dbFileName = home + "/" + name + ".db";
            HashDatabaseConfig dbConfig = new HashDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            db = HashDatabase.Open(dbFileName, dbConfig);
            cursor = db.Cursor();
        }

 public override void TestConfigWithoutEnv()
 {
     testName = "TestConfigWithoutEnv";
     SetUpTest(false);
     XmlElement xmlElem = Configuration.TestSetUp(
         testFixtureName, testName);
     HashDatabaseConfig hashConfig = new HashDatabaseConfig();
     Config(xmlElem, ref hashConfig, true);
     Confirm(xmlElem, hashConfig, true);
 }

        public static void Confirm(XmlElement xmlElement,
		    HashDatabaseConfig hashDBConfig, bool compulsory)
        {
            DatabaseConfig dbConfig = hashDBConfig;
            Confirm(xmlElement, dbConfig, compulsory);

            // Confirm Hash database specific configuration.
            Configuration.ConfirmCreatePolicy(xmlElement,
                "Creation", hashDBConfig.Creation, compulsory);
            Configuration.ConfirmDuplicatesPolicy(xmlElement,
                "Duplicates", hashDBConfig.Duplicates, compulsory);
            Configuration.ConfirmUint(xmlElement, "FillFactor",
                hashDBConfig.FillFactor, compulsory);
            Configuration.ConfirmUint(xmlElement, "NumElements",
                hashDBConfig.TableSize, compulsory);
        }

        static void Main( string[] args )
        {
            try {
                var cfg = new HashDatabaseConfig();
                cfg.Duplicates = DuplicatesPolicy.UNSORTED;
                cfg.Creation = CreatePolicy.IF_NEEDED;
                cfg.CacheSize = new CacheInfo( 0, 64 * 1024, 1 );
                cfg.PageSize = 8 * 1024;

                Database db = HashDatabase.Open( "d:\\test.db", "hat_db", cfg );

                Console.WriteLine("db opened");

                var key = new DatabaseEntry();
                var data = new DatabaseEntry();

                key.Data = System.Text.Encoding.ASCII.GetBytes("key1");
                data.Data = System.Text.Encoding.ASCII.GetBytes("val1");

                try {
                    db.Put( key, data );
                    db.Put( key, data );
                }
                catch ( Exception ex ) {
                    Console.WriteLine( ex.Message );
                }

                using ( var dbc = db.Cursor() ) {

                    System.Text.ASCIIEncoding decode = new ASCIIEncoding();

                    /* Walk through the database and print out key/data pairs. */
                    Console.WriteLine( "All key : data pairs:" );
                    foreach ( KeyValuePair<DatabaseEntry, DatabaseEntry> p in dbc )
                        Console.WriteLine( "{0}::{1}",
                            decode.GetString( p.Key.Data ), decode.GetString( p.Value.Data ) );
                }

                db.Close();
                Console.WriteLine( "db closed" );
            }
            catch ( Exception ex ) {
                Console.WriteLine( ex.Message );
            }

            Console.ReadLine();
        }

        private void Config(HashDatabaseConfig cfg) {
            base.Config(cfg);
            /* 
             * Database.Config calls set_flags, but that does not get the Hash
             * specific flags.  No harm in calling it again.
             */
            db.set_flags(cfg.flags);

            if (cfg.BlobDir != null && cfg.Env == null)
                db.set_blob_dir(cfg.BlobDir);

            if (cfg.blobThresholdIsSet)
                db.set_blob_threshold(cfg.BlobThreshold, 0);
            
            if (cfg.HashFunction != null)
                HashFunction = cfg.HashFunction;
            // The duplicate comparison function cannot change.
            if (cfg.DuplicateCompare != null)
                DupCompare = cfg.DuplicateCompare;
            if (cfg.fillFactorIsSet)
                db.set_h_ffactor(cfg.FillFactor);
            if (cfg.nelemIsSet)
                db.set_h_nelem(cfg.TableSize);
            if (cfg.HashComparison != null)
                Compare = cfg.HashComparison;

            if (cfg.partitionIsSet) {
                nparts = cfg.NParts;
                Partition = cfg.Partition;
                if (Partition == null)
                    doPartitionRef = null;
                else
                    doPartitionRef = new BDB_PartitionDelegate(doPartition);
                partitionKeys = cfg.PartitionKeys;
                IntPtr[] ptrs = null;
                if (partitionKeys != null) {
                    int size = (int)nparts - 1;
                    ptrs = new IntPtr[size];
                    for (int i = 0; i < size; i++) {
                        ptrs[i] = DBT.getCPtr(
                            DatabaseEntry.getDBT(partitionKeys[i])).Handle;
                    }
                }
                db.set_partition(nparts, ptrs, doPartitionRef);
            }
        }

        private void Config(HashDatabaseConfig cfg) {
            base.Config(cfg);
            /* 
             * Database.Config calls set_flags, but that doesn't get the Hash
             * specific flags.  No harm in calling it again.
             */
            db.set_flags(cfg.flags);
            
            if (cfg.HashFunction != null)
                HashFunction = cfg.HashFunction;
            // The duplicate comparison function cannot change.
            if (cfg.DuplicateCompare != null)
                DupCompare = cfg.DuplicateCompare;
            if (cfg.fillFactorIsSet)
                db.set_h_ffactor(cfg.FillFactor);
            if (cfg.nelemIsSet)
                db.set_h_nelem(cfg.TableSize);
            if (cfg.HashComparison != null)
                Compare = cfg.HashComparison;

        }

        public static void Config(XmlElement xmlElement,
		    ref HashDatabaseConfig hashDBConfig, bool compulsory)
        {
            uint fillFactor = new uint();
            uint numElements = new uint();
            DatabaseConfig dbConfig = hashDBConfig;
            Config(xmlElement, ref dbConfig, compulsory);

            // Configure specific fields/properties of Hash db
            Configuration.ConfigCreatePolicy(xmlElement,
                "Creation", ref hashDBConfig.Creation,
                compulsory);
            Configuration.ConfigDuplicatesPolicy(xmlElement,
                "Duplicates", ref hashDBConfig.Duplicates,
                compulsory);
            if (Configuration.ConfigUint(xmlElement, "FillFactor",
                ref fillFactor, compulsory))
                hashDBConfig.FillFactor = fillFactor;
            if (Configuration.ConfigUint(xmlElement, "NumElements",
                ref numElements, compulsory))
                hashDBConfig.TableSize = numElements;
        }

 /// <summary>
 /// Instantiate a new HashDatabase object and open the database
 /// represented by <paramref name="Filename"/>.
 /// </summary>
 /// <remarks>
 /// <para>
 /// If <paramref name="Filename"/> is null, the database is strictly
 /// temporary and cannot be opened by any other thread of control, thus
 /// the database can only be accessed by sharing the single database
 /// object that created it, in circumstances where doing so is safe.
 /// </para>
 /// <para>
 /// If <paramref name="txn"/> is null, but
 /// <see cref="DatabaseConfig.AutoCommit"/> is set, the operation will
 /// be implicitly transaction protected. Note that transactionally
 /// protected operations on a datbase object requires the object itself
 /// be transactionally protected during its open. Also note that the
 /// transaction must be committed before the object is closed.
 /// </para>
 /// </remarks>
 /// <param name="Filename">
 /// The name of an underlying file that will be used to back the
 /// database. In-memory databases never intended to be preserved on disk
 /// may be created by setting this parameter to null.
 /// </param>
 /// <param name="cfg">The database's configuration</param>
 /// <param name="txn">
 /// If the operation is part of an application-specified transaction,
 /// <paramref name="txn"/> is a Transaction object returned from
 /// <see cref="DatabaseEnvironment.BeginTransaction"/>; if
 /// the operation is part of a Berkeley DB Concurrent Data Store group,
 /// <paramref name="txn"/> is a handle returned from
 /// <see cref="DatabaseEnvironment.BeginCDSGroup"/>; otherwise null.
 /// </param>
 /// <returns>A new, open database object</returns>
 public static HashDatabase Open(
     string Filename, HashDatabaseConfig cfg, Transaction txn)
 {
     return Open(Filename, null, cfg, txn);
 }

        public void TestHashFunction()
        {
            testName = "TestHashFunction";
            SetUpTest(true);
            string dbFileName = testHome + "/" + testName + ".db";
            string dbSecFileName = testHome + "/" +
                testName + "_sec.db";

            // Open a primary hash database.
            HashDatabaseConfig dbConfig =
                new HashDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            HashDatabase hashDB = HashDatabase.Open(
                dbFileName, dbConfig);

            /*
             * Define hash function and open a secondary
             * hash database.
             */
            SecondaryHashDatabaseConfig secDBConfig =
                new SecondaryHashDatabaseConfig(hashDB, null);
            secDBConfig.HashFunction =
                new HashFunctionDelegate(HashFunction);
            secDBConfig.Creation = CreatePolicy.IF_NEEDED;
            SecondaryHashDatabase secDB =
               SecondaryHashDatabase.Open(dbSecFileName,
               secDBConfig);

            /*
             * Confirm the hash function defined in the configuration.
             * Call the hash function and the one from secondary
             * database. If they return the same value, then the hash
             * function is configured successfully.
             */
            uint data = secDB.HashFunction(BitConverter.GetBytes(1));
            Assert.AreEqual(0, data);

            // Close all.
            secDB.Close();
            hashDB.Close();
        }

        public void TestInsertToLoc()
        {
            HashDatabase db;
            HashDatabaseConfig dbConfig;
            HashCursor cursor;
            DatabaseEntry data;
            KeyValuePair<DatabaseEntry, DatabaseEntry> pair;
            string dbFileName;

            testName = "TestInsertToLoc";
            SetUpTest(true);
            dbFileName = testHome + "/" + testName + ".db";

            // Open database and cursor.
            dbConfig = new HashDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;

            /*
             * The database should be set to be unsorted to
             * insert before/after a certain record.
             */
            dbConfig.Duplicates = DuplicatesPolicy.UNSORTED;
            db = HashDatabase.Open(dbFileName, dbConfig);
            cursor = db.Cursor();

            // Add record("key", "data") into database.
            AddOneByCursor(cursor);

            /*
             * Insert the new record("key","data1") after the
             * record("key", "data").
             */
            data = new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("data1"));
            cursor.Insert(data, Cursor.InsertLocation.AFTER);

            /*
             * Move the cursor to the record("key", "data") and
             * confirm that the next record is the one just inserted.
             */
            pair = new KeyValuePair<DatabaseEntry, DatabaseEntry>(
                new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("key")),
                new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("data")));
            Assert.IsTrue(cursor.Move(pair, true));
            Assert.IsTrue(cursor.MoveNext());
            Assert.AreEqual(ASCIIEncoding.ASCII.GetBytes("key"),
                cursor.Current.Key.Data);
            Assert.AreEqual(ASCIIEncoding.ASCII.GetBytes("data1"),
                cursor.Current.Value.Data);

            try {
                try {
                    cursor.Insert(data,
                        Cursor.InsertLocation.FIRST);
                    throw new TestException();
                } catch (ArgumentException) { }
                try
                {
                    cursor.Insert(data,
                        Cursor.InsertLocation.LAST);
                    throw new TestException();
                } catch (ArgumentException) { }
            } finally {
                cursor.Close();
                db.Close();
            }
        }

        public void TestHashComparison()
        {
            testName = "TestHashComparison";
            testHome = testFixtureHome + "/" + testName;
            string dbFileName = testHome + "/" + testName + ".db";
            Configuration.ClearDir(testHome);

            HashDatabaseConfig dbConfig = new HashDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;
            dbConfig.HashComparison = new EntryComparisonDelegate(EntryComparison);
            HashDatabase db = HashDatabase.Open(dbFileName,dbConfig);
            int ret;

            /*
             * Comparison gets the value that lowest byte of the
             * former dbt minus that of the latter one.
             */
            ret = db.Compare(new DatabaseEntry(BitConverter.GetBytes(2)),
                new DatabaseEntry(BitConverter.GetBytes(2)));
            Assert.AreEqual(0, ret);

            ret = db.Compare(new DatabaseEntry(BitConverter.GetBytes(256)),
                new DatabaseEntry(BitConverter.GetBytes(1)));
            Assert.Greater(0, ret);

            db.Close();
        }

        public void TestAddUnique()
        {
            HashDatabase db;
            HashCursor cursor;
            KeyValuePair<DatabaseEntry, DatabaseEntry> pair;

            testName = "TestAddUnique";
            SetUpTest(true);

            // Open a database and cursor.
            HashDatabaseConfig dbConfig = new HashDatabaseConfig();
            dbConfig.Creation = CreatePolicy.IF_NEEDED;

            /*
             * To put no duplicate data, the database should be
             * set to be sorted.
             */
            dbConfig.Duplicates = DuplicatesPolicy.SORTED;
            db = HashDatabase.Open(
                testHome + "/" + testName + ".db", dbConfig);
            cursor = db.Cursor();

            // Add record("key", "data") into database.
            AddOneByCursor(cursor);

            /*
             * Fail to add duplicate record("key","data").
             */
            pair = new KeyValuePair<DatabaseEntry, DatabaseEntry>(
                new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("key")),
                new DatabaseEntry(ASCIIEncoding.ASCII.GetBytes("data")));
            try
            {
                cursor.AddUnique(pair);
            }
            catch (KeyExistException)
            {
            }
            finally
            {
                cursor.Close();
                db.Close();
            }
        }

        public void TestConfig()
        {
            testName = "TestConfig";
            testHome = testFixtureHome + "/" + testName;
            string dbFileName = testHome + "/" + testName + ".db";

            Configuration.ClearDir(testHome);
            XmlElement xmlElem = Configuration.TestSetUp(
                testFixtureName, testName);
            // Open a primary btree database.
            HashDatabaseConfig hashDBConfig =
                new HashDatabaseConfig();
            hashDBConfig.Creation = CreatePolicy.IF_NEEDED;
            HashDatabase hashDB = HashDatabase.Open(
                dbFileName, hashDBConfig);

            SecondaryHashDatabaseConfig secDBConfig =
                new SecondaryHashDatabaseConfig(hashDB, null);

            Config(xmlElem, ref secDBConfig, true);
            Confirm(xmlElem, secDBConfig, true);

            // Close the primary btree database.
            hashDB.Close();
        }

        public void TestOpenNewHashDB()
        {
            testName = "TestOpenNewHashDB";
            testHome = testFixtureHome + "/" + testName;
            string dbFileName = testHome + "/" + testName + ".db";

            Configuration.ClearDir(testHome);

            XmlElement xmlElem = Configuration.TestSetUp(testFixtureName, testName);
            HashDatabaseConfig hashConfig = new HashDatabaseConfig();
            HashDatabaseConfigTest.Config(xmlElem, ref hashConfig, true);
            HashDatabase hashDB = HashDatabase.Open(dbFileName, hashConfig);
            Confirm(xmlElem, hashDB, true);
            hashDB.Close();
        }