J2ME RecordStore更新问题，删除操作(Problem with J2ME RecordStore update, delete operation)

 我创建一个列表，显示来自RecordStore的数据。 我尝试更新记录并重新显示列表（重新打开相同的RecordStore），但更新的项目不会更改（仍包含旧数据）。 
 我还试图删除一个项目，删除的项目仍然显示在列表中。 
 我使用带有Java ME SDK 3.0的NetBeans 7.0中的模拟器运行程序 
 
 这是更新记录的代码 
 
public void updateClient(Client cl) throws Exception{
        RecordStore rs=RecordStore.openRecordStore(String.valueOf(clientsStoreKey), true);
        int recNum=rs.getNumRecords();
        if (recNum>0){
            RecordEnumeration renum=rs.enumerateRecords(null, null,false);
            while(renum.hasNextElement()){
                int id = renum.nextRecordId();
                byte[] buff=rs.getRecord(id);
                Client temp=Client.createFrom(buff);
                if(temp.clientId.compareTo(cl.clientId)==0){  
                    temp.firstName=cl.firstName;
                    temp.lastName=cl.lastName;
                    temp.city=cl.city;
                    temp.state=cl.state;
                    temp.company=cl.company;
                    temp.phone=cl.phone;
                    ByteArrayOutputStream bos=new ByteArrayOutputStream();
                    DataOutputStream dos=new DataOutputStream(bos);
                    temp.writeTo(dos);
                    byte[] sData=bos.toByteArray();                  
                    rs.setRecord(id, sData, 0, sData.length);
                    dos.close();
                    bos.close();  
                    break;
                }
            }
            renum.destroy();
        }
        rs.closeRecordStore();       

    }  
 
 这是获取记录的代码 
 
public Vector getClients()
    throws Exception{

        RecordStore rs=RecordStore.openRecordStore(String.valueOf(clientsStoreKey), true);
        int recNum=rs.getNumRecords();
        Vector cls=new Vector();

        if (recNum>0){
            RecordEnumeration renum=rs.enumerateRecords(null, null,false);
            while(renum.hasNextElement()){
                byte[] buff=renum.nextRecord();
                Client cl=Client.createFrom(buff);
                cls.addElement(cl);
            }
            renum.destroy();
        }
        rs.closeRecordStore();
        return cls;
    }

I create a List showing data from a RecordStore. I tried to update a record and the re-display the list (re-open the same RecordStore), but the updated item doesn't change (still contain the old data).
 I also tried to delete an item and the deleted item is still displayed in the list.
 I run the program using emulator from NetBeans 7.0 with Java ME SDK 3.0 
 
This is the code for updating the record 
 
public void updateClient(Client cl) throws Exception{
        RecordStore rs=RecordStore.openRecordStore(String.valueOf(clientsStoreKey), true);
        int recNum=rs.getNumRecords();
        if (recNum>0){
            RecordEnumeration renum=rs.enumerateRecords(null, null,false);
            while(renum.hasNextElement()){
                int id = renum.nextRecordId();
                byte[] buff=rs.getRecord(id);
                Client temp=Client.createFrom(buff);
                if(temp.clientId.compareTo(cl.clientId)==0){  
                    temp.firstName=cl.firstName;
                    temp.lastName=cl.lastName;
                    temp.city=cl.city;
                    temp.state=cl.state;
                    temp.company=cl.company;
                    temp.phone=cl.phone;
                    ByteArrayOutputStream bos=new ByteArrayOutputStream();
                    DataOutputStream dos=new DataOutputStream(bos);
                    temp.writeTo(dos);
                    byte[] sData=bos.toByteArray();                  
                    rs.setRecord(id, sData, 0, sData.length);
                    dos.close();
                    bos.close();  
                    break;
                }
            }
            renum.destroy();
        }
        rs.closeRecordStore();       

    }  
 
And this is the code to get the records 
 
public Vector getClients()
    throws Exception{

        RecordStore rs=RecordStore.openRecordStore(String.valueOf(clientsStoreKey), true);
        int recNum=rs.getNumRecords();
        Vector cls=new Vector();

        if (recNum>0){
            RecordEnumeration renum=rs.enumerateRecords(null, null,false);
            while(renum.hasNextElement()){
                byte[] buff=renum.nextRecord();
                Client cl=Client.createFrom(buff);
                cls.addElement(cl);
            }
            renum.destroy();
        }
        rs.closeRecordStore();
        return cls;
    }

原文：https://stackoverflow.com/questions/7050807