else return false; return true;
szRecords = db.GetRecordByNumber(0) + db.GetRecordByNumber(1) + db.GetRecordByNumber(2);
db.close();
MessageBox mbox; mbox = new MessageBox(szRecords, this, "Database records", true);
mbox.show();
}
else if(obj.equals("Content")) { MessageBox mbox; mbox = new MessageBox( "Item Content selected", this, "Dialog from Frame", true);
mbox.show();
}
else if(obj.equals("About")) { MessageBox mbox; mbox = new MessageBox( "Item About selected", this, "Dialog from Frame", true);
mbox.show();
} else return false; return true; } return false; } }
class MessageBox extends Dialog { Label lbMsg; Button btnOK;
public MessageBox(String sMsg, Frame parent, String sTitle, boolean modal) { super(parent, sTitle, modal);
resize(300, 100);
setLayout(new GridLayout(2, 1));
lbMsg = new Label(sMsg, Label.CENTER);
add(lbMsg);
btnOK = new Button("OK");
add(btnOK);
}
public boolean handleEvent(Event evt) { if(evt.id == Event.WINDOW_DESTROY) { dispose();
return true; } else return super.handleEvent(evt);
}
public boolean action(Event evt, Object obj) { Button btn; if(evt.target instanceof Button) { btn = (Button)evt.target;
if(evt.target.equals(btnOK)) { dispose();
} else return false; return true; } return false; } }
class SimpleDBMS { RandomAccessFile idx; RandomAccessFile dat;
long idxFilePointer = 0;
public SimpleDBMS(String IndexFile, String DataFile) { try { idx = new RandomAccessFile( IndexFile, "rw");
dat = new RandomAccessFile( DataFile, "rw");
} catch(Exception ioe) { System.out.println(ioe.toString());
} }
public void close() { try { idx.close();
dat.close();
} catch(Exception ioe) { System.out.println(ioe.toString());
} }
public void AddRecord(String name, int account) { try { idx.seek(idx.length());
dat.seek(dat.length());
idxFilePointer = dat.getFilePointer();
idx.writeLong(idxFilePointer);
dat.writeBytes(name+ "\r\n");
dat.writeInt(account);
} catch(Exception ioe) { System.out.println(ioe.toString());
} }
public String GetRecordByNumber(long nRec) { String sRecord = "<empty>
";
try { Integer account; String str = null;
idx.seek(nRec * 8);
idxFilePointer = idx.readLong();
dat.seek(idxFilePointer);
str = dat.readLine();
account = new Integer(dat.readInt());
sRecord = new String(">
" + account + ", " + str);
} catch(Exception ioe) { System.out.println(ioe.toString());
} return sRecord; } }
