| r2;
}
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。
J2ME中RMS的使用解析(2)
时间:2011-01-13
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[i] = app;
//System.out.println("app["+i+"] "+app.getStr2());
}
rs.closeRecordStore();
} catch (Exception e) {
}
return result;
}
public static Appointment getRecord(String name, int j) {//根据记录编号（参数 int j）取得一条记录
Appointment result = new Appointment();
try {
RecordStore rs = RecordStore.openRecordStore(name, false);
RecordEnumeration re = rs.enumerateRecords(null, null, false);
result = new Appointment(rs.getRecord(j));
rs.closeRecordStore();
} catch (Exception e) {
}
re
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