JavaMe连载(7)-数据永久存储 (五)

2 关闭数据库

[html] public void closeDataBase() {
if (info!= null) {
try {
info.closeRecordStore();
info=null;
} catch (RecordStoreException ex) {}
}
}
public void closeDataBase() {
if (info!= null) {
try {
info.closeRecordStore();
info=null;
} catch (RecordStoreException ex) {}
}
}

3 增加记录(增)

[html] public int db_addRecord(UserDataItem item) {

try {
this.openDataBase();
byte[] data=item.getBytes();
int id=info.getNextRecordID();
info.addRecord(data,0,data.length);
this.closeDataBase();
return id;
} catch (RecordStoreException ex) { }

return -1;
}
public int db_addRecord(UserDataItem item) {

try {
this.openDataBase();
byte[] data=item.getBytes();
int id=info.getNextRecordID();
info.addRecord(data,0,data.length);
this.closeDataBase();
return id;
} catch (RecordStoreException ex) { }

return -1;
}

4 更新记录(改)

[html] //更新记录
public void db_updateRecord(UserDataItem item){

try {
this.openDataBase();
byte[] data=item.getBytes();
info.setRecord(item.getId(),data,0,data.length);
this.closeDataBase();
} catch (RecordStoreException ex) { }
}
//更新记录
public void db_updateRecord(UserDataItem item){

try {
this.openDataBase();
byte[] data=item.getBytes();
info.setRecord(item.getId(),data,0,data.length);
this.closeDataBase();
} catch (RecordStoreException ex) { }
}

5 查看记录(查)

[html] //访问一条记录
public UserDataItem db_getRecord(int id){
UserDataItem item=null;

try {
this.openDataBase();
item = new UserDataItem(id,info.getRecord(id));
this.closeDataBase();
} catch (RecordStoreException ex) { }

return item;
}
//访问一条记录
public UserDataItem db_getRecord(int id){
UserDataItem item=null;

try {
this.openDataBase();
item = new UserDataItem(id,info.getRecord(id));
this.closeDataBase();
} catch (RecordStoreException ex) { }

return item;
}

6 删除记录

[html] public void db_deleteRecord(int id){
try {
this.openDataBase();
info.deleteRecord(id);
this.closeDataBase();
} catch (RecordStoreException ex) {}
}
public void db_deleteRecord(int id){