recordstoretest.java

十分简单的记录站操作

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.rms.*;

public class RecordStoreTest extends MIDlet {
	private RecordStore rs;
private Display display;
public RecordStoreTest() {
		super();
		display = Display.getDisplay(this);
	}

	protected void startApp() throws MIDletStateChangeException {
		String dbname = "testdb";
		Form f = new Form("RS Test");
		rs = openRSAnyway(dbname);
		if (rs == null) {
			//		启动失败，停止MIDlet
			f.append("Table open fail");
		} else {
			try {
				f.append("Last modified :" + rs.getLastModified());
				f.append("\nRS Name :" + rs.getName());
				f.append("\nNext ID :" + rs.getNextRecordID());
				f.append("\nRecord num :" + rs.getNumRecords());
				f.append("\nSize :" + rs.getSize());
				f.append("\nAvaliable Size :" + rs.getSizeAvailable());
				f.append("\nVersion :" + rs.getVersion());		
				rs.closeRecordStore();
				deleteRS(dbname) ;
				
			} catch (Exception e) {
			}
		}
		display.setCurrent(f);
	}
	protected void pauseApp() {
	}


	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
	}
public RecordStore openRSAnyway(String rsname) {
		RecordStore rs = null;
		//	名称长度要求小于32位
		if (rsname.length() > 32)
			return null;
		try {
			rs = RecordStore.openRecordStore(rsname, true);
			return rs;
		} catch (Exception e) {
			return null;
		}
	}
public boolean deleteRS(String rsname) {
		if (rsname.length() > 32)
			return false;
		try {
			RecordStore.deleteRecordStore(rsname);
		} catch (Exception e) {
			return false;
		}
		return true;
	}	
}