Greendao数据库封装的工具类

public class GreendaoUtils {
    private static GreendaoUtils mInstance;
    private GreendaoUtils(){

    }

    /**
     * 双重检测锁
     */
    public static GreendaoUtils getInstance(){
        if (mInstance==null){
            synchronized(GreendaoUtils.class){
                if (mInstance==null){
                    mInstance=new GreendaoUtils();
                }
            }
        }
        return mInstance;
    }

    /**
     * 初始化GreenDao，直接在Application中进行初始化操作
     */
    public void initGreenDao(Context context){
        //创建daomaster
        DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(context, Constants.DB_NNAME);
        SQLiteDatabase db = helper.getWritableDatabase();//db读写数据库
        DaoMaster daoMaster = new DaoMaster(db);

        //创建daosession
        daoSession = daoMaster.newSession();
    }

    private DaoSession daoSession;
    public DaoSession getDaoSession(){
        return daoSession;
    }
}