android - ORMLite 获取单个数据库列

Question

我正在尝试将此 SQL 命令与 Ormlite 一起使用:

select address from receive

使用这段代码:

List<Receivers> receiver_address = receiverDao.queryBuilder().selectColumns("address").query();

但是返回的对象是:

1 = {Receivers@830028192208} 
 address = {String@830028192264} "my new address"
 city = null
 email = null
 telephone = null
 mobile = null
 name_family = null
 national_code = null
 postal_code = null
 receiver_name = null
 id = 2

我只需要此查询中的 address 字段而无需 iterator 例如:

List<String> list = new ArrayList<String>();
for( Receivers lst:receiver_address)
    list.add(lst.getAddress());

如何做这个 Action ？

Answer 1

你可以在这里使用 RawRowMapper:

List<String> addresses = receiverDao.queryRaw("select address from receive", new RawRowMapper<String>() {
       @Override
       public String mapRow(String[] columnNames, String[] resultColumns) throws SQLException {
            return resultColumns[0];
       }
}).getResults();