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public int getInt1() { //int return int1; } public int getInt2() { return int2; } public long getLong1() { return long1; }
public String getStr1() { //String return str1; }
public String getStr2() { //String return str2; }
public String getStr3() { return str3; }
public boolean getWroteFlag() { //返回写入标志 return WroteFlag; } } 这个类的使用保证了我们在使用流时,内容的写入和输出。当然,就如同数据库表的设计一样,我们可以任意对每一条记录增加或减少字段,在上面的类中我只使用了int1,int2,long1,str1,str2,str3和WroteFlag一共7个字段。
二、RecordStore的操作。类RMS如下: package com.cuilichen.usual;
import javax.microedition.rms.RecordEnumeration; import javax.microedition.rms.RecordStore;
public class RMS { public static final int Int1 = 0;//各个字段的默认数值 public static final int Int2 = 0; public static final long Long1 = 0; public static final String Str1 = ""; public static final String Str2 = ""; public static final String Str3 = "";
public static boolean addRecord(String name, int int1, int int2,//添加记录 long long1, String str1, String str2, String str3, boolean b) { boolean success = false;
try { RecordStore rs = RecordStore.openRecordStore(name, true); Appointment app = new Appointment(int1, int2, long1, str1, str2,str3, b); //既然str1作为保留字段,我们在这里就要如此操作:例如int1为我们设定的关键字,那么str1 = Integer.toString(int1); byte[] data = app.toBytes(); rs.addRecord(data, 0, data.length); rs.closeRecordStore(); success = true; } catch (Exception e) { e.printStackTrace(); } return success; } public static int getNumOfRecords(String name) {//得到RMS中记录的条数 try { RecordStore rs = RecordStore.openRecordStore(name, true);
return rs.getNumRecords(); } catch (Exception e) { return 0; } }
public static Appointment[] getRecords(String name) {//取得RMS中的所有记录 Appointment[] result = { };
try { RecordStore rs = RecordStore.openRecordStore(name, false); RecordEnumeration re = rs.enumerateRecords(null, null, false); result = new Appointment[rs.getNumRecords()];
for (int i = 0; i < result.length; i++) { int j = re.previousRecordId(); Appointment app = new Appointment(rs.getRecord(j)); result = app;
//System.out.println("app["+i+"] "+app.getStr2()); }
rs.closeRecordStore(); } catch (Exception e) { }
return result; }
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