Realm數據庫的基本操作

public class BaseRealmDao {

    private Realm realm;

    public BaseRealmDao(Realm realm) {
        this.realm = realm;
    }

    /**
     * 添加(性能優於下面的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(性能優於下面的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(性能優於下面的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(性能優於下面的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 已經保存的對象
     */
    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 全部失敗
     */
    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數據
     * @param clazz      具體類型
     * @return 已經保存的對象
     */
    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數組
     * @param clazz 類型
     * @return 批量保存json對象是否成功
     */
    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;
        }
    }

    /**
     * 刪除當前表中所有數據
     *
     * @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刪除制定的記錄
     *
     * @param clazz       類型
     * @param idFieldName id字段的名稱
     * @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;
        }
    }

    /**
     * 查詢所有
     *
     * @return 返回結果集合
     */
    public RealmResults<? extends RealmObject> findAll(Class<? extends RealmObject> clazz) {
        return realm.where(clazz).findAll();
    }

    /**
     * 清空數據庫
     *
     * @return
     */
    public boolean clearDatabase() {
        try {
            realm.beginTransaction();
            realm.deleteAll();
            realm.commitTransaction();
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            realm.cancelTransaction();
            return false;
        }
    }
}