private void createSecDB(SecondaryConfig secConfig) {
TupleBinding<DataRow> tBinder = new GenericTupleBinder(tMap);
SecondaryKeyCreator secKeyCreator = new GenericSecKeyCreator(tBinder, secIndexPos, tMap);
// Get a secondary object and set the key creator on it.
secConfig.setKeyCreator(secKeyCreator);
String secDbName = tableName + "-secDB";
secDB = myDbEnvironment.openSecondaryDatabase(null, secDbName, myDB, secConfig);
}
public static void main(String[] args) {
Environment myEnv;
Database myDatabase;
try {
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setAllowCreate(true);
myEnv = new Environment(new File("/Users/broso/testDB"), envConfig);
// Environment open omitted for clarity
DatabaseConfig myDbConfig = new DatabaseConfig();
SecondaryConfig mySecConfig = new SecondaryConfig();
myDbConfig.setAllowCreate(true);
mySecConfig.setAllowCreate(true);
// Duplicates are frequently required for secondary databases.
mySecConfig.setSortedDuplicates(true);
// Open the primary
String dbName = "myPrimaryDatabase";
Database myDb = myEnv.openDatabase(null, dbName, myDbConfig);
// Open the secondary.
// Key creators are described in the next section.
// AKeyCreator akc = new AKeyCreator();
// Get a secondary object and set the key creator on it.
// mySecConfig.setKeyCreator(keyCreator);
// Perform the actual open
String secDbName = "mySecondaryDatabase";
SecondaryDatabase mySecDb = myEnv.openSecondaryDatabase(null, secDbName, myDb, mySecConfig);
} catch (DatabaseException de) {
// Exception handling goes here
}
}
public SecondaryDatabase create2ndDB(Database db, String dbName) {
return env.openSecondaryDatabase(null, dbName, db, set2ndDbConfig());
}
/** Insert or retrieve data. */
public void run() throws DatabaseException {
/* Create a new, transactional database environment. */
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setTransactional(true);
envConfig.setAllowCreate(true);
Environment exampleEnv = new Environment(envDir, envConfig);
/*
* 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);
/*
* In our example, the database record is composed of an integer key
* and and instance of the MyData class as data.
*
* A class catalog database is needed for storing class descriptions
* for the serial binding used below. This avoids storing class
* descriptions redundantly in each record.
*/
DatabaseConfig catalogConfig = new DatabaseConfig();
catalogConfig.setTransactional(true);
catalogConfig.setAllowCreate(true);
Database catalogDb = exampleEnv.openDatabase(txn, "catalogDb", catalogConfig);
StoredClassCatalog catalog = new StoredClassCatalog(catalogDb);
/*
* Create a serial binding for MyData data objects. Serial
* bindings can be used to store any Serializable object.
*/
EntryBinding<MyData> dataBinding = new SerialBinding<MyData>(catalog, MyData.class);
/*
* Further below we'll use a tuple binding (IntegerBinding
* specifically) for integer keys. Tuples, unlike serialized
* Java objects, have a well defined sort order.
*/
/*
* Define a String tuple binding for a secondary key. The
* secondary key is the msg field of the MyData object.
*/
EntryBinding<String> secKeyBinding = TupleBinding.getPrimitiveBinding(String.class);
/*
* Open a secondary database to allow accessing the primary
* database by the secondary key value.
*/
SecondaryConfig secConfig = new SecondaryConfig();
secConfig.setTransactional(true);
secConfig.setAllowCreate(true);
secConfig.setSortedDuplicates(true);
secConfig.setKeyCreator(new MyKeyCreator(secKeyBinding, dataBinding));
SecondaryDatabase exampleSecDb =
exampleEnv.openSecondaryDatabase(txn, "bindingsSecDb", exampleDb, secConfig);
txn.commit();
/* DatabaseEntry represents the key and data of each record. */
DatabaseEntry keyEntry = new DatabaseEntry();
DatabaseEntry dataEntry = new DatabaseEntry();
if (doInsert) {
/*
* Put some data in. Note that the primary database is always used
* 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());
IntegerBinding.intToEntry(i, keyEntry);
dataBinding.objectToEntry(data, dataEntry);
OperationStatus status = exampleDb.put(txn, keyEntry, dataEntry);
/*
* Note that put will throw a DatabaseException when error
* conditions are found such as deadlock. However, the status
* return conveys a variety of information. For example, the
* put might succeed, or it might not succeed if the record
* exists and duplicates were not
*/
if (status != OperationStatus.SUCCESS) {
throw new RuntimeException("Data insertion got status " + status);
}
txn.commit();
}
} else {
/*
* Retrieve the data by secondary key by opening a cursor on the
* secondary database. The key parameter for a secondary cursor is
* always the secondary key, but the data parameter is always the
* 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) {
String key = secKeyBinding.entryToObject(keyEntry);
MyData data = dataBinding.entryToObject(dataEntry);
System.out.println("key=" + key + " data=" + data);
}
cursor.close();
txn.commit();
}
/*
* Always close secondary databases before closing their associated
* primary database.
*/
catalogDb.close();
exampleSecDb.close();
exampleDb.close();
exampleEnv.close();
}
/**
* Opens a secondary index with a given transaction and adds it to the secIndexMap. We assume that
* the index is not already open.
*/
private <SK, PK, E1, E2 extends E1> SecondaryIndex<SK, PK, E2> openSecondaryIndex(
Transaction txn,
PrimaryIndex<PK, E1> primaryIndex,
Class<E2> entityClass,
EntityMetadata entityMeta,
Class<SK> keyClass,
String keyClassName,
SecondaryKeyMetadata secKeyMeta,
String secName,
boolean doNotCreate,
PrimaryOpenState priOpenState)
throws DatabaseException {
assert !secIndexMap.containsKey(secName);
String dbName = storePrefix + secName;
SecondaryConfig config = getSecondaryConfig(secName, entityMeta, keyClassName, secKeyMeta);
Database priDb = primaryIndex.getDatabase();
DatabaseConfig priConfig = priDb.getConfig();
String relatedClsName = secKeyMeta.getRelatedEntity();
if (relatedClsName != null) {
PrimaryIndex relatedIndex = getRelatedIndex(relatedClsName);
config.setForeignKeyDatabase(relatedIndex.getDatabase());
}
if (config.getTransactional() != priConfig.getTransactional()
|| DbCompat.getDeferredWrite(config) != DbCompat.getDeferredWrite(priConfig)
|| config.getReadOnly() != priConfig.getReadOnly()) {
throw new IllegalArgumentException(
"One of these properties was changed to be inconsistent"
+ " with the associated primary database: "
+ " Transactional, DeferredWrite, ReadOnly");
}
PersistKeyBinding keyBinding = getKeyBinding(keyClassName);
/*
* doNotCreate is true when StoreConfig.getSecondaryBulkLoad is true
* and we are opening a secondary as a side effect of opening a
* primary, i.e., getSecondaryIndex is not being called. If
* doNotCreate is true and the database does not exist, we silently
* ignore the DatabaseNotFoundException and return null. When
* getSecondaryIndex is subsequently called, the secondary database
* will be created and populated from the primary -- a bulk load.
*/
SecondaryDatabase db;
boolean saveAllowCreate = config.getAllowCreate();
try {
if (doNotCreate) {
config.setAllowCreate(false);
}
db = env.openSecondaryDatabase(txn, dbName, priDb, config);
} catch (DatabaseNotFoundException e) {
if (doNotCreate) {
return null;
} else {
throw e;
}
} finally {
if (doNotCreate) {
config.setAllowCreate(saveAllowCreate);
}
}
SecondaryIndex<SK, PK, E2> secIndex =
new SecondaryIndex(db, null, primaryIndex, keyClass, keyBinding);
/* Update index and database maps. */
secIndexMap.put(secName, secIndex);
if (DbCompat.getDeferredWrite(config)) {
deferredWriteDatabases.put(db, null);
}
if (priOpenState != null) {
priOpenState.addDatabase(db);
priOpenState.addSecondaryName(secName);
}
return secIndex;
}
