private static void closeEnv() {
System.out.println("Closing env and databases");
if (myDb != null) {
try {
myDb.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: myDb: " + e.toString());
e.printStackTrace();
}
}
if (myClassDb != null) {
try {
myClassDb.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: myClassDb: " + e.toString());
e.printStackTrace();
}
}
if (myEnv != null) {
try {
myEnv.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: " + e.toString());
e.printStackTrace();
}
}
}
public void testTruncate() throws DatabaseException {
SecondaryDatabase secDb = initDb();
Database priDb = secDb.getPrimaryDatabase();
Transaction txn = txnBegin();
for (int i = 0; i < NUM_RECS; i += 1) {
priDb.put(txn, entry(i), entry(i));
}
verifyRecords(txn, priDb, NUM_RECS, false);
verifyRecords(txn, secDb, NUM_RECS, true);
txnCommit(txn);
secDb.close();
priDb.close();
txn = txnBegin();
assertEquals(NUM_RECS, env.truncateDatabase(txn, "testDB", true));
assertEquals(NUM_RECS, env.truncateDatabase(txn, "testSecDB", true));
txnCommit(txn);
secDb = initDb();
priDb = secDb.getPrimaryDatabase();
txn = txnBegin();
verifyRecords(txn, priDb, 0, false);
verifyRecords(txn, secDb, 0, true);
txnCommit(txn);
secDb.close();
priDb.close();
}
/*
* Check that the notReplicate attribute is properly immutable and
* persistent.
*/
private void validate(DatabaseConfig config, boolean replicated) throws DatabaseException {
/* Create the database -- is its config what we expect? */
db = env.openDatabase(null, TEST_DB, config);
DatabaseConfig inUseConfig = db.getConfig();
assertEquals(replicated, DbInternal.getReplicated(inUseConfig));
/* Close, re-open. */
db.close();
db = null;
db = env.openDatabase(null, TEST_DB, inUseConfig);
assertEquals(replicated, DbInternal.getReplicated(db.getConfig()));
/*
* Close, re-open w/inappropriate value for the replicated bit. This is
* only checked for replicated environments.
*/
db.close();
db = null;
if (DbInternal.getEnvironmentImpl(env).isReplicated()) {
DbInternal.setReplicated(inUseConfig, !replicated);
try {
db = env.openDatabase(null, TEST_DB, inUseConfig);
fail("Should have caught config mismatch");
} catch (IllegalArgumentException expected) {
}
}
}
public void testReadOnly() throws DatabaseException {
SecondaryDatabase secDb = initDb();
Database priDb = secDb.getPrimaryDatabase();
OperationStatus status;
Transaction txn = txnBegin();
for (int i = 0; i < NUM_RECS; i += 1) {
status = priDb.put(txn, entry(i), entry(i));
assertSame(OperationStatus.SUCCESS, status);
}
/*
* Secondaries can be opened without a key creator if the primary is
* read only. openSecondary will specify a null key creator if the
* readOnly param is false.
*/
Database readOnlyPriDb = openDatabase(false, "testDB", true);
SecondaryDatabase readOnlySecDb = openSecondary(readOnlyPriDb, true, "testSecDB", false, true);
assertNull(readOnlySecDb.getSecondaryConfig().getKeyCreator());
verifyRecords(txn, readOnlySecDb, NUM_RECS, true);
txnCommit(txn);
readOnlySecDb.close();
readOnlyPriDb.close();
secDb.close();
priDb.close();
}
public void merge() throws Exception {
LOG.info("start merge");
Database crawldbDatabase = env.openDatabase(null, "crawldb", BerkeleyDBUtils.defaultDBConfig);
/*合并fetch库*/
LOG.info("merge fetch database");
Database fetchDatabase = env.openDatabase(null, "fetch", BerkeleyDBUtils.defaultDBConfig);
Cursor fetchCursor = fetchDatabase.openCursor(null, null);
DatabaseEntry key = new DatabaseEntry();
DatabaseEntry value = new DatabaseEntry();
while (fetchCursor.getNext(key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
crawldbDatabase.put(null, key, value);
}
fetchCursor.close();
fetchDatabase.close();
/*合并link库*/
LOG.info("merge link database");
Database linkDatabase = env.openDatabase(null, "link", BerkeleyDBUtils.defaultDBConfig);
Cursor linkCursor = linkDatabase.openCursor(null, null);
while (linkCursor.getNext(key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
if (!(crawldbDatabase.get(null, key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS)) {
crawldbDatabase.put(null, key, value);
}
}
linkCursor.close();
linkDatabase.close();
LOG.info("end merge");
crawldbDatabase.sync();
crawldbDatabase.close();
env.removeDatabase(null, "fetch");
LOG.debug("remove fetch database");
env.removeDatabase(null, "link");
LOG.debug("remove link database");
}
public void testOpenAndClose() throws DatabaseException {
Database priDb = openDatabase(false, "testDB", false);
/* Open two secondaries as regular databases and as secondaries. */
Database secDbDetached = openDatabase(true, "testSecDB", false);
SecondaryDatabase secDb = openSecondary(priDb, true, "testSecDB", false, false);
Database secDb2Detached = openDatabase(true, "testSecDB2", false);
SecondaryDatabase secDb2 = openSecondary(priDb, true, "testSecDB2", false, false);
assertEquals(
priDb.getSecondaryDatabases(), Arrays.asList(new SecondaryDatabase[] {secDb, secDb2}));
Transaction txn = txnBegin();
/* Check that primary writes to both secondaries. */
checkSecondaryUpdate(txn, priDb, 1, secDbDetached, true, secDb2Detached, true);
/* New txn before closing database. */
txnCommit(txn);
txn = txnBegin();
/* Close 2nd secondary. */
secDb2.close();
assertEquals(priDb.getSecondaryDatabases(), Arrays.asList(new SecondaryDatabase[] {secDb}));
/* Check that primary writes to 1st secondary only. */
checkSecondaryUpdate(txn, priDb, 2, secDbDetached, true, secDb2Detached, false);
/* New txn before closing database. */
txnCommit(txn);
txn = txnBegin();
/* Close 1st secondary. */
secDb.close();
assertEquals(0, priDb.getSecondaryDatabases().size());
/* Check that primary writes to no secondaries. */
checkSecondaryUpdate(txn, priDb, 3, secDbDetached, false, secDb2Detached, false);
/* Open the two secondaries again. */
secDb = openSecondary(priDb, true, "testSecDB", false, false);
secDb2 = openSecondary(priDb, true, "testSecDB2", false, false);
assertEquals(
priDb.getSecondaryDatabases(), Arrays.asList(new SecondaryDatabase[] {secDb, secDb2}));
/* Check that primary writes to both secondaries. */
checkSecondaryUpdate(txn, priDb, 4, secDbDetached, true, secDb2Detached, true);
/* Close the primary first to disassociate secondaries. */
txnCommit(txn);
priDb.close();
assertNull(secDb.getPrimaryDatabase());
assertNull(secDb2.getPrimaryDatabase());
secDb2.close();
secDb.close();
secDb2Detached.close();
secDbDetached.close();
}
@Override
public synchronized void close() {
try {
db.close();
classCatalogDb.close();
env.close();
} catch (DatabaseException dbe) {
logger.error("Error closing db environment!", dbe);
}
}
@Override
public void shutdown() {
// ------ closing down everything
// sync according to literature needed if no transaction used
RelationBDB.close();
NodeBDB.close();
environment.sync();
environment.close();
}
private void doReplicaHasGapNetworkRestore(boolean multiGaps) throws Throwable {
Durability noAck =
new Durability(SyncPolicy.NO_SYNC, SyncPolicy.NO_SYNC, ReplicaAckPolicy.NONE);
db = null;
try {
Environment master = setupLogWithCleanedGaps(multiGaps);
int masterIdx = findMasterIndex(master);
/*
* Write a record, so that we are sure that there will be a
* network restore, because we have to cross a checkpoint.
*/
generateData(master, 1, noAck, false);
CheckpointConfig cc = new CheckpointConfig();
master.checkpoint(cc);
EnvironmentStats stats = master.getStats(clearConfig);
assertEquals(0, stats.getCleanerBacklog());
if (multiGaps) {
logger.info("Multigap: deletion backlog = " + stats.getFileDeletionBacklog());
} else {
assertEquals(0, stats.getFileDeletionBacklog());
}
db.close();
db = null;
repEnvInfo[masterIdx].closeEnv();
/* Start up the two replicas */
openReplicas(masterIdx);
/* Start the node that had been the master */
try {
repEnvInfo[masterIdx].openEnv();
fail("Should be a network restore");
} catch (InsufficientLogException ile) {
repEnvInfo[masterIdx].closeEnv();
NetworkRestore restore = new NetworkRestore();
NetworkRestoreConfig config = new NetworkRestoreConfig();
config.setRetainLogFiles(true);
restore.execute(ile, config);
repEnvInfo[masterIdx].openEnv();
}
/* Check its last VLSN and size. */
} catch (Throwable t) {
t.printStackTrace();
throw t;
} finally {
if (db != null) {
db.close();
}
RepTestUtils.shutdownRepEnvs(repEnvInfo);
}
}
public void close() {
try {
urlsDB.close();
} catch (DatabaseException e) {
e.printStackTrace();
}
}
private void verifyDb(Hashtable dataMap, int dumpIndex) throws DatabaseException {
DatabaseConfig config = new DatabaseConfig();
config.setReadOnly(true);
DbInternal.setUseExistingConfig(config, true);
Database myDb = env.openDatabase(null, dbName + dumpIndex, config);
Cursor cursor = myDb.openCursor(null, null);
StringDbt foundKey = new StringDbt();
StringDbt foundData = new StringDbt();
OperationStatus status = cursor.getFirst(foundKey, foundData, LockMode.DEFAULT);
while (status == OperationStatus.SUCCESS) {
String foundKeyString = foundKey.getString();
String foundDataString = foundData.getString();
if (dataMap.get(foundKeyString) != null) {
assertTrue(((String) dataMap.get(foundKeyString)).equals(foundDataString));
dataMap.remove(foundKeyString);
} else {
fail("didn't find key in either map (" + foundKeyString + ")");
}
status = cursor.getNext(foundKey, foundData, LockMode.DEFAULT);
}
assertTrue(dataMap.size() == 0);
cursor.close();
myDb.close();
}
/* Insert 100 records begins with the beginKey. */
private void doWork(Environment master, String dbName, int beginKey) throws Exception {
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setAllowCreate(true);
dbConfig.setTransactional(true);
/* Insert/Update the records of the database. */
Database db = master.openDatabase(null, dbName, dbConfig);
DatabaseEntry key = new DatabaseEntry();
DatabaseEntry data = new DatabaseEntry();
for (int i = 0; i < 100; i++) {
IntegerBinding.intToEntry(beginKey + i, key);
StringBinding.stringToEntry("herococo", data);
db.put(null, key, data);
}
db.close();
/*
* Do a sync at the end of the stage to make sure master and
* replica have the same data set.
*/
VLSN commitVLSN = RepTestUtils.syncGroupToLastCommit(repEnvInfo, repEnvInfo.length);
RepTestUtils.checkNodeEquality(commitVLSN, false, repEnvInfo);
}
/**
* Close the database.
*
* @param cleanLog if true then wait for the BerkeleyDB clean thread to finish.
*/
@Override
public void close(boolean cleanLog) {
log.info("Closing db & env for: " + dir.getAbsolutePath());
if (openIterators.size() > 0) {
log.warn("closing " + openIterators.size() + " iterators on close");
for (Object e : openIterators.toArray(new Object[openIterators.size()])) {
((ClosableIterator<Map.Entry<byte[], byte[]>>) e).close();
}
}
log.info("pages:gets=" + gets + " puts=" + puts + " in=" + bytesIn + " out=" + bytesOut);
bdb.close();
if (cleanLog) {
bdb_env.getConfig().setConfigParam(EnvironmentConfig.ENV_RUN_CLEANER, "false");
int totalLogFiles = 0;
int logFiles;
do {
logFiles = bdb_env.cleanLog();
totalLogFiles += logFiles;
} while (logFiles > 0);
log.info("Total of " + totalLogFiles + " log files cleaned.");
if (totalLogFiles > 0) {
CheckpointConfig force = new CheckpointConfig();
force.setForce(true);
bdb_env.checkpoint(force);
}
}
bdb_env.close();
}
public BDBCreator(String tableName, ArrayList<Integer> keyPositions, int secondaryIndex) {
/* Creates and loads a BDB table with a secondary index on the column defined by*/
this.tableName = tableName.toLowerCase();
this.keyPositions = keyPositions;
this.secIndexPos = secondaryIndex;
this.tMap = Main.indexTypeMaps.get(this.tableName);
setEnvironment();
dbConfig = new DatabaseConfig();
dbConfig.setAllowCreate(true);
myDB = myDbEnvironment.openDatabase(null, this.tableName, dbConfig);
SecondaryConfig secConfig = new SecondaryConfig();
secConfig.setAllowCreate(true);
secConfig.setSortedDuplicates(true);
createSecDB(secConfig);
setConfig(dbConfig, secConfig);
loadData();
if (secDB != null) {
secDB.close();
}
if (myDB != null) {
myDB.close();
}
closeEnvironment();
}
public void run(File envHomeDirectory) throws DatabaseException, IOException {
/* Create the environment object. */
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setAllowCreate(true);
Environment env = new Environment(envHomeDirectory, envConfig);
/* Create the database object. */
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setAllowCreate(true);
Database db = env.openDatabase(null, DB_NAME, dbConfig);
/* Create the sequence oject. */
SequenceConfig config = new SequenceConfig();
config.setAllowCreate(true);
DatabaseEntry key = new DatabaseEntry(KEY_NAME.getBytes("UTF-8"));
Sequence seq = db.openSequence(null, key, config);
/* Allocate a few sequence numbers. */
for (int i = 0; i < 10; i++) {
long seqnum = seq.get(null, 1);
System.out.println("Got sequence number: " + seqnum);
}
/* Close all. */
seq.close();
db.close();
env.close();
}
/**
* Copies entries from an existing environment db to a new one. If historyMap is not provided,
* only logs the entries that would have been copied.
*
* @param sourceDir existing environment database directory
* @param historyMap new environment db (or null for a dry run)
* @return number of records
* @throws DatabaseException
*/
private static int copyPersistEnv(File sourceDir, StoredSortedMap<String, Map> historyMap)
throws DatabaseException {
int count = 0;
// open the source env history DB, copying entries to target env
EnhancedEnvironment sourceEnv = setupCopyEnvironment(sourceDir, true);
StoredClassCatalog sourceClassCatalog = sourceEnv.getClassCatalog();
DatabaseConfig historyDbConfig = HISTORY_DB_CONFIG.toDatabaseConfig();
historyDbConfig.setReadOnly(true);
Database sourceHistoryDB = sourceEnv.openDatabase(null, URI_HISTORY_DBNAME, historyDbConfig);
StoredSortedMap<String, Map> sourceHistoryMap =
new StoredSortedMap<String, Map>(
sourceHistoryDB,
new StringBinding(),
new SerialBinding<Map>(sourceClassCatalog, Map.class),
true);
Iterator<Entry<String, Map>> iter = sourceHistoryMap.entrySet().iterator();
while (iter.hasNext()) {
Entry<String, Map> item = iter.next();
if (logger.isLoggable(Level.FINE)) {
logger.fine(item.getKey() + " " + new JSONObject(item.getValue()));
}
if (historyMap != null) {
historyMap.put(item.getKey(), item.getValue());
}
count++;
}
StoredIterator.close(iter);
sourceHistoryDB.close();
sourceEnv.close();
return count;
}
/** Test exclusive creation. */
@Test
public void testExclusive() throws Throwable {
try {
EnvironmentConfig envConfig = TestUtils.initEnvConfig();
/*
* Make sure that the database keeps its own copy of the
* configuration object.
*/
envConfig.setAllowCreate(true);
env = create(envHome, envConfig);
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setAllowCreate(true);
dbConfig.setExclusiveCreate(true);
/* Should succeed and create the database. */
Database dbA = env.openDatabase(null, "foo", dbConfig);
dbA.close();
/* Should not succeed, because the database exists. */
try {
env.openDatabase(null, "foo", dbConfig);
fail("Database already exists");
} catch (DatabaseException e) {
}
close(env);
} catch (Throwable t) {
t.printStackTrace();
throw t;
}
}
/**
* Close any databases opened during this operation when it fails. This method should be called
* if a non-transactional operation fails, since we cannot rely on the transaction abort to
* cleanup any databases that were opened.
*/
void closeDatabases() {
for (Database db : databases.keySet()) {
try {
db.close();
} catch (Exception ignored) {
}
}
}
public void lock() throws Exception {
lockDatabase = env.openDatabase(null, "lock", BerkeleyDBUtils.defaultDBConfig);
DatabaseEntry key = new DatabaseEntry("lock".getBytes("utf-8"));
DatabaseEntry value = new DatabaseEntry("locked".getBytes("utf-8"));
lockDatabase.put(null, key, value);
lockDatabase.sync();
lockDatabase.close();
}
@Override
protected void finalTasks() {
try {
historyDb.sync();
historyDb.close();
} catch (DatabaseException e) {
// TODO Auto-generated catch block
throw new RuntimeException(e);
}
}
private void close() {
if (db != null) {
db.close();
db = null;
}
if (env != null) {
env.close();
env = null;
}
}
@Test
public void testCleanAfterDbTruncate() {
open(true /*runCleaner*/);
writeFiles(5 /*nActive*/, 0 /*nObsolete*/);
expectNothingToClean();
db.close();
db = null;
env.truncateDatabase(null, DB_NAME, false);
expectBackgroundCleaning();
close();
}
private DatabaseException closeDb(Database db, DatabaseException firstException) {
if (db != null) {
try {
db.close();
} catch (DatabaseException e) {
if (firstException == null) {
firstException = e;
}
}
}
return firstException;
}
public void testPopulate() throws DatabaseException {
Database priDb = openDatabase(false, "testDB", false);
Transaction txn = txnBegin();
/* Test population of newly created secondary database. */
for (int i = 0; i < NUM_RECS; i += 1) {
assertSame(OperationStatus.SUCCESS, priDb.put(txn, entry(i), entry(i)));
}
txnCommit(txn);
SecondaryDatabase secDb = openSecondary(priDb, true, "testSecDB", true, false);
txn = txnBegin();
verifyRecords(txn, secDb, NUM_RECS, true);
txnCommit(txn);
/*
* Clear secondary and perform populate again, to test the case where
* an existing database is opened, and therefore a write txn will only
* be created in order to populate it
*/
Database secDbDetached = openDatabase(true, "testSecDB", false);
secDb.close();
txn = txnBegin();
for (int i = 0; i < NUM_RECS; i += 1) {
assertSame(OperationStatus.SUCCESS, secDbDetached.delete(txn, entry(i + KEY_OFFSET)));
}
verifyRecords(txn, secDbDetached, 0, true);
txnCommit(txn);
secDb = openSecondary(priDb, true, "testSecDB", true, false);
txn = txnBegin();
verifyRecords(txn, secDb, NUM_RECS, true);
verifyRecords(txn, secDbDetached, NUM_RECS, true);
txnCommit(txn);
secDbDetached.close();
secDb.close();
priDb.close();
}
/* Do the real reading work. */
private void doRead(Environment env, DatabaseConfig dbConfig, ArrayList<TestObject> list)
throws Exception {
Database db = env.openDatabase(null, dbName, dbConfig);
Cursor cursor = db.openCursor(null, null);
DatabaseEntry key = new DatabaseEntry();
DatabaseEntry data = new DatabaseEntry();
while (OperationStatus.SUCCESS == cursor.getNext(key, data, null)) {
list.add(new TestObject(IntegerBinding.entryToInt(key), StringBinding.entryToString(data)));
}
cursor.close();
db.close();
}
public static void main(String[] args) {
Environment env = null;
Database db = null;
EnvironmentConfig envconfig = new EnvironmentConfig();
envconfig.setAllowCreate(true);
try {
env = new Environment(new File("D://bdb"), envconfig);
DatabaseConfig dbconfig = new DatabaseConfig();
dbconfig.setAllowCreate(true);
db = env.openDatabase(null, "dbac.db", dbconfig);
String key = "mykey";
DatabaseEntry thekey = new DatabaseEntry();
thekey.setData(key.getBytes("utf-8"));
Long value = new Long(123456);
DatabaseEntry thevalue = new DatabaseEntry();
EntryBinding myBinging = TupleBinding.getPrimitiveBinding(Long.class);
myBinging.objectToEntry(value, thevalue);
// LongBinding myLongBinging=(LongBinding)TupleBinding.getPrimitiveBinding(Long.class);
// myLongBinging.objectToEntry(value, thevalue);
db.put(null, thekey, thevalue);
DatabaseEntry valueEntry = new DatabaseEntry();
OperationStatus status = db.get(null, thekey, valueEntry, LockMode.DEFAULT);
if (status == OperationStatus.SUCCESS) {
// Long number=myLongBinging.entryToObject(valueEntry);
Long number = (Long) myBinging.entryToObject(valueEntry);
System.out.println(env.getDatabaseNames());
System.out.println(number);
}
} catch (EnvironmentLockedException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (db != null) {
try {
db.close();
} catch (DatabaseException e) {
e.printStackTrace();
}
}
if (env != null) {
try {
env.cleanLog();
env.close();
} catch (DatabaseException e) {
e.printStackTrace();
}
}
}
}
public void testDupInitialized() throws DatabaseException {
/* Open db. */
initEnv(false);
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setAllowCreate(true);
Database myDb = exampleEnv.openDatabase(null, "fooDb", dbConfig);
/* Open uninitialized cursor. */
Cursor c1 = myDb.openCursor(null, null);
try {
c1.getCurrent(new DatabaseEntry(), new DatabaseEntry(), null);
fail();
} catch (DatabaseException expected) {
}
/* Dup uninitialized cursor with samePosition=false. */
Cursor c2 = c1.dup(false);
try {
c2.getCurrent(new DatabaseEntry(), new DatabaseEntry(), null);
fail();
} catch (DatabaseException expected) {
}
/* Dup uninitialized cursor with samePosition=true. */
Cursor c3 = c1.dup(true);
try {
c3.getCurrent(new DatabaseEntry(), new DatabaseEntry(), null);
fail();
} catch (DatabaseException expected) {
}
/* Ensure dup'ed cursors are usable. */
assertEquals(
OperationStatus.SUCCESS,
c1.put(new DatabaseEntry(new byte[0]), new DatabaseEntry(new byte[0])));
assertEquals(
OperationStatus.SUCCESS, c2.getFirst(new DatabaseEntry(), new DatabaseEntry(), null));
assertEquals(
OperationStatus.NOTFOUND, c2.getNext(new DatabaseEntry(), new DatabaseEntry(), null));
assertEquals(
OperationStatus.SUCCESS, c3.getFirst(new DatabaseEntry(), new DatabaseEntry(), null));
assertEquals(
OperationStatus.NOTFOUND, c3.getNext(new DatabaseEntry(), new DatabaseEntry(), null));
/* Close db. */
c3.close();
c2.close();
c1.close();
myDb.close();
}
public static <EnvironmenConfig> void envconfig() {
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setTransactional(false);
envConfig.setAllowCreate(true);
File envDir = new File("d://");
try {
// 新建环境变量
Environment exampleEnv = new Environment(envDir, envConfig);
String databaseName = "ToDoTaskList.db";
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setAllowCreate(true);
dbConfig.setTransactional(false);
// 打开用来存储类信息的数据库
// 用来存储类信息的数据库数据库，不要求能共存储重复的关键字
dbConfig.setSortedDuplicates(false);
Database myClassDb = exampleEnv.openDatabase(null, databaseName, dbConfig);
// 初始化catalog类
StoredClassCatalog catalog = new StoredClassCatalog(myClassDb);
TupleBinding<String> keyBinding = TupleBinding.getPrimitiveBinding(String.class);
// 把value作为对象的序列化方式存储
SerialBinding<String> valueBinding = new SerialBinding<String>(catalog, String.class);
Database store = exampleEnv.openDatabase(null, databaseName, dbConfig);
// 建立数据存储映射
StoredSortedMap<String, String> map =
new StoredSortedMap<String, String>(store, keyBinding, valueBinding, true);
// 释放环境变量
// exampleEnv.syncReplication();
store.close();
myClassDb.close();
exampleEnv.close();
exampleEnv = null;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public boolean isLocked() throws Exception {
boolean isLocked = false;
lockDatabase = env.openDatabase(null, "lock", BerkeleyDBUtils.defaultDBConfig);
DatabaseEntry key = new DatabaseEntry("lock".getBytes("utf-8"));
DatabaseEntry value = new DatabaseEntry();
if (lockDatabase.get(null, key, value, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
String lockInfo = new String(value.getData(), "utf-8");
if (lockInfo.equals("locked")) {
isLocked = true;
}
}
lockDatabase.close();
return isLocked;
}
/*
* This method will:
* 1. apply the modified DatabaseConfig to the database.
* 2. close the database and do a sync to make sure the new configuration
* is written to the log.
* 3. open the database with a useExisting config and return the current
* DatabaseConfig.
*/
private DatabaseConfig setAndGetDbConfig(Environment env, DatabaseConfig dbConfig, String dbName)
throws Exception {
Database db = env.openDatabase(null, "foo", dbConfig);
db.close();
env.sync();
/*
* Open with the useExisting config to see what attributes have been
* persisted.
*/
DatabaseConfig newConfig = new DatabaseConfig();
newConfig.setReadOnly(true);
newConfig.setTransactional(true);
newConfig.setUseExistingConfig(true);
db = env.openDatabase(null, dbName, newConfig);
newConfig = db.getConfig();
db.close();
return newConfig;
}