/**
  * 读取省份信息
  *
  * @return
  */
 public List<Province> loadProvinces() {
   List<Province> list = new ArrayList<>();
   Cursor cursor = db.query("Province", null, null, null, null, null, null);
   if (cursor != null) {
     while (cursor.moveToNext()) {
       Province province = new Province();
       province.setId(cursor.getInt(cursor.getColumnIndex("_id")));
       province.setProvinceName(cursor.getString(cursor.getColumnIndex("province_name")));
       province.setProvinceCode(cursor.getString(cursor.getColumnIndex("province_code")));
       list.add(province);
     }
   }
   cursor.close();
   return list;
 }
 /**
  * 保存省份信息
  *
  * @param province
  */
 public void saveProvince(Province province) {
   ContentValues values = new ContentValues();
   values.put("province_name", province.getProvinceName());
   values.put("province_code", province.getProvinceCode());
   db.insert("Province", null, values);
 }