Embedded key-store store database wrapping-up

In my last post, I have mentioned about what a key-value store database and little about Sleepycat. While Sleepycat is great, it needs some configuration before actually using it. For this reason, I have written an wrapper which stores only unicode-based strings as key and value. The code is given in the following Gist. The usage example has been given in the comment.

	package models;
	import java.io.File;
	import java.io.UnsupportedEncodingException;
	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.Transaction;
	import com.sleepycat.je.txn.Txn;
	/*
	* KeyStore config = new KeyStore();
	* config.put("name", "Dagvadorj");
	* config.commit();
	* String name = config.get("name");
	* config.close();
	*/
	public class KeyStore {
	private static EnvironmentConfig environmentConfig;
	private static Environment environ;
	private static DatabaseConfig databaseConfig;
	private static Database db;
	private static Transaction txn;
	public KeyStore() {
	environmentConfig = new EnvironmentConfig();
	environmentConfig.setAllowCreate(true);
	environmentConfig.setTransactional(true);
	environ = new Environment(new File("configdb"), environmentConfig);
	databaseConfig = new DatabaseConfig();
	databaseConfig.setAllowCreate(true);
	databaseConfig.setTransactional(true);
	txn = environ.beginTransaction(null, null);
	db = environ.openDatabase(null, "Navigator",
	databaseConfig);
	}
	public static String get(String key) {
	DatabaseEntry keyEntry = new DatabaseEntry();
	DatabaseEntry dataEntry = new DatabaseEntry();
	try {
	keyEntry.setData(key.getBytes("utf-8"));
	} catch (UnsupportedEncodingException e) {
	return null;
	}
	db.get(null, keyEntry, dataEntry, LockMode.DEFAULT);
	try {
	byte [] data = dataEntry.getData();
	if (data == null) return null;
	return new String(dataEntry.getData(), "utf-8");
	} catch (UnsupportedEncodingException e) {
	return null;
	}
	}
	public static boolean put(String key, String value) {
	try {
	db.put(null, new DatabaseEntry(key.getBytes("utf-8")),
	new DatabaseEntry(value.getBytes("utf-8")));
	} catch (DatabaseException e) {
	return false;
	} catch (UnsupportedEncodingException e){
	return false;
	}
	return true;
	}
	public static void commit() {
	txn.commit();
	}
	public static void close() {
	db.close();
	environ.close();
	}
	}

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