stockdb.java

来自「手机游戏设计一书的源代码」· Java 代码 · 共 60 行

package rms;

import javax.microedition.rms.*;
import java.util.Enumeration;
import java.util.Vector;
import java.io.*;

public class StockDB {

  RecordStore recordStore = null;

  public StockDB() {}

  public StockDB(String fileName) {
     try {
       recordStore = RecordStore.openRecordStore(fileName, true);
     } catch(RecordStoreException rse) {
       rse.printStackTrace();
     }
  }

  public void close() throws RecordStoreNotOpenException,
                              RecordStoreException {
       if (recordStore.getNumRecords() == 0) {
           String fileName = recordStore.getName();
           recordStore.closeRecordStore();
           recordStore.deleteRecordStore(fileName);
       } else {
           recordStore.closeRecordStore();
       }
   }


  public synchronized void addNewStock(String record) {
       ByteArrayOutputStream baos = new ByteArrayOutputStream();
       DataOutputStream outputStream = new DataOutputStream(baos);
       try {
           outputStream.writeUTF(record);
       }
       catch (IOException ioe) {
           System.out.println(ioe);
           ioe.printStackTrace();
       }
       byte[] b = baos.toByteArray();
       try {
           recordStore.addRecord(b, 0, b.length);
       }
       catch (RecordStoreException rse) {
           System.out.println(rse);
           rse.printStackTrace();
       }
   }

 public synchronized RecordEnumeration enumerate() throws RecordStoreNotOpenException {
      return recordStore.enumerateRecords(null, null, false);
   }

}