Android Realm数据库demo_无缓存

package com.duke.realm_test.model; import org.json.JSONArray; import java.util.List; import io.realm.Realm; import io.realm.RealmObject; import io.realm.RealmResults; /** * @DateTime: 2016-07-13 09:33 * @Author: duke * @Deacription: dao */ public class BaseDao { private Realm realm; public BaseDao(Realm realm) { this.realm = realm; } /** * 添加(性能优于下面的saveOrUpdate（）方法) * * @param object * @return 保存或者修改是否成功 */ public boolean insert(RealmObject object) { try { realm.beginTransaction(); realm.insert(object); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } /** * 添加(性能优于下面的saveOrUpdateBatch（）方法) * * @param list * @return 批量保存是否成功 */ public boolean insert(List<? extends RealmObject> list) { try { realm.beginTransaction(); realm.insert(list); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } /** * 添加或者修改(性能优于下面的saveOrUpdate（）方法) * * @param object * @return 保存或者修改是否成功 */ public boolean insertOrUpdate(RealmObject object) { try { realm.beginTransaction(); realm.insertOrUpdate(object); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } /** * 添加或者修改(性能优于下面的saveOrUpdateBatch（）方法) * * @param list * @return 保存或者修改是否成功 */ public boolean insertOrUpdateBatch(List<? extends RealmObject> list) { try { realm.beginTransaction(); realm.insertOrUpdate(list); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } /** * 添加或者修改 * * @param object * @return 已经保存的对象 */ public <E extends RealmObject> E saveOrUpdate(E object) { E savedE = null; try { realm.beginTransaction(); savedE = realm.copyToRealmOrUpdate(object); realm.commitTransaction(); return savedE; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return savedE; } } /** * 批量添加或者修改 * * @param list * @return 全部保存成功 或 全部失败 */ public boolean saveOrUpdateBatch(List<? extends RealmObject> list) { try { realm.beginTransaction(); realm.copyToRealmOrUpdate(list); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } /** * save or update RealmObject from json data * * @param jsonObject json数据 * @param clazz 具体类型 * @return 已经保存的对象 */ public RealmObject saveOrUpdateFromJSON(Class<? extends RealmObject> clazz, String jsonObject) { RealmObject RealmObject = null; try { realm.beginTransaction(); RealmObject = realm.createOrUpdateObjectFromJson(clazz, jsonObject); realm.commitTransaction(); return RealmObject; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return RealmObject; } } /** * batch save or update from json array * * @param json json数组 * @param clazz 类型 * @return 批量保存json对象是否成功 */ public boolean saveOrUpdateFromJSONBatch(Class<? extends RealmObject> clazz,JSONArray json) { try { realm.beginTransaction(); realm.createOrUpdateAllFromJson(clazz, json); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } /** * 删除当前表中所有数据 * * @param clazz * @return */ public boolean deleteAll(Class<? extends RealmObject> clazz) { try { realm.beginTransaction(); realm.delete(clazz); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } /** * 按照id删除制定的记录 * @param clazz 类型 * @param idFieldName id字段的名称 * @param id id字段值 * @return */ public boolean deleteById(Class<? extends RealmObject> clazz,String idFieldName,int id) { try { realm.beginTransaction(); realm.where(clazz).equalTo(idFieldName, id).findAll().deleteFirstFromRealm(); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } /** * 查询所有 * @return 返回结果集合 */ public RealmResults<? extends RealmObject> findAll(Class<? extends RealmObject> clazz) { return realm.where(clazz).findAll(); } /** * 清空数据库 * * @return */ public boolean clearDatabase() { try { realm.beginTransaction(); realm.deleteAll(); realm.commitTransaction(); return true; } catch (Exception e) { e.printStackTrace(); realm.cancelTransaction(); return false; } } }