You can transaction-protect your cursor operations by specifying a transaction handle at the time that you create your cursor. Beyond that, you do not ever provide a transaction handle directly to a cursor method.
Note that if you transaction-protect a cursor, then you must make sure that the cursor is closed before you either commit or abort the transaction. For example:
package je.txn;
import com.sleepycat.je.Cursor;
import com.sleepycat.je.Database;
import com.sleepycat.je.DatabaseConfig;
import com.sleepycat.je.DatabaseEntry;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.Environment;
import com.sleepycat.je.EnvironmentConfig;
import com.sleepycat.je.LockMode;
import com.sleepycat.je.OperationStatus;
import com.sleepycat.je.Transaction;
import java.io.File;
...
Database myDatabase = null;
Environment myEnv = null;
try {
// Database and environment opens omitted
String replacementData = "new data";
Transaction txn = myEnv.beginTransaction(null, null);
Cursor cursor = null;
try {
// Use the transaction handle here
cursor = db.openCursor(txn, null);
DatabaseEntry key, data;
DatabaseEntry key, data;
while(cursor.getNext(key, data, LockMode.DEFAULT) ==
OperationStatus.SUCCESS) {
data.setData(replacementData.getBytes("UTF-8"));
// No transaction handle is used on the cursor read or write
// methods.
cursor.putCurrent(data);
}
cursor.close();
cursor = null;
txn.commit();
} catch (Exception e) {
if (cursor != null) {
cursor.close();
}
if (txn != null) {
txn.abort();
txn = null;
}
}
} catch (DatabaseException de) {
// Exception handling goes here
}