MDB_INTEGERKEY usage about lmdbjava HOT 5 CLOSED

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.file.Files;
import org.lmdbjava.Cursor;
import org.lmdbjava.Dbi;
import org.lmdbjava.DbiFlags;
import org.lmdbjava.Env;
import org.lmdbjava.Txn;

/**
 * Created by devin on 4/18/17.
 */
public class LMDBIntKey {
    private final ByteBuffer KEY = ByteBuffer.allocateDirect(4);
    private final ByteBuffer VALUE = ByteBuffer.allocateDirect(2);

    private final Env<ByteBuffer> env;
    private final Dbi<ByteBuffer> db;

    public LMDBIntKey() throws IOException {
        final File dir = Files.createTempDirectory(LMDBIntKey.class.getSimpleName()).toFile();
        env = Env.create().open(dir);
        db = env.openDbi(
            LMDBIntKey.class.getSimpleName(),
            DbiFlags.MDB_CREATE,
            DbiFlags.MDB_INTEGERKEY);

        //KEY.order(ByteOrder.BIG_ENDIAN);
        //KEY.order(ByteOrder.LITTLE_ENDIAN);
        KEY.order(ByteOrder.nativeOrder());    /// <---- *** CHANGED ***
    }

    public void execute() {
        KEY.clear();
        KEY.putInt(0x000000FF); // 255
        KEY.flip();
        VALUE.clear();
        VALUE.putChar('a');
        VALUE.flip();
        db.put(KEY, VALUE);

        KEY.clear();
        KEY.putInt(0x00000100); // 256
        KEY.flip();
        VALUE.clear();
        VALUE.putChar('b');
        VALUE.flip();
        db.put(KEY, VALUE);

        try (final Txn<ByteBuffer> txn = env.txnRead()) {
            try (final Cursor<ByteBuffer> cursor = db.openCursor(txn)) {
                if (!cursor.first()) {
                    throw new IllegalStateException("Expected first()");
                }
                cursor.key().order(ByteOrder.nativeOrder());    /// <---- *** CHANGED ***
                System.out.println(String.format("%d %08X %c",
                    cursor.key().getInt(0),
                    cursor.key().getInt(0),
                    cursor.val().getChar(0)));
                if (!cursor.next()) {
                    throw new IllegalStateException("Expected next()");
                }
                System.out.println(String.format("%d %08X %c",
                    cursor.key().getInt(0),
                    cursor.key().getInt(0),
                    cursor.val().getChar(0)));
            }
        }
    }

    public static void main(String[] args) throws IOException {
        final LMDBIntKey wal = new LMDBIntKey();
        wal.execute();
    }
}