/** 将City实例存储到数据库。 */
public void saveCity(City city) {
if (city != null) {
ContentValues values = new ContentValues();
values.put("city_name", city.getCityName());
values.put("city_code", city.getCityCode());
values.put("province_id", city.getProvinceId());
db.insert("City", null, values);
}
}
/** 从数据库读取某省下所有的城市信息。 */
public List<City> loadCities(int provinceId) {
List<City> list = new ArrayList<City>();
Cursor cursor =
db.query(
"City",
null,
"province_id = ?",
new String[] {String.valueOf(provinceId)},
null,
null,
null);
if (cursor.moveToFirst()) {
do {
City city = new City();
city.setId(cursor.getInt(cursor.getColumnIndex("id")));
city.setCityName(cursor.getString(cursor.getColumnIndex("city_name")));
city.setCityCode(cursor.getString(cursor.getColumnIndex("city_code")));
city.setProvinceId(provinceId);
list.add(city);
} while (cursor.moveToNext());
}
return list;
}