persistence

Dirty flags on Realm objects

由 梦想的初衷 提交于 2020-03-03 11:42:07
问题 Can anyone suggest a good pattern for implementing a dirty flag on Realm objects? Specifically, I would like every subclass of Realm Object to expose an isDirty flag that gets set whenever an instance of the class is modified and is cleared whenever the instance is written to the cloud (not the Realm). I'm working in Objective-C. Possible solutions I can think of include the following: Write a custom setter for every property of every objects. Set isDirty within each of those setters. Not

Dirty flags on Realm objects

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-03-03 11:41:54
问题 Can anyone suggest a good pattern for implementing a dirty flag on Realm objects? Specifically, I would like every subclass of Realm Object to expose an isDirty flag that gets set whenever an instance of the class is modified and is cleared whenever the instance is written to the cloud (not the Realm). I'm working in Objective-C. Possible solutions I can think of include the following: Write a custom setter for every property of every objects. Set isDirty within each of those setters. Not

深入理解HTTPS及在iOS系统中适配HTTPS类型网络请求(下)

由 时光怂恿深爱的人放手 提交于 2020-03-02 10:00:31
深入理解HTTPS及在iOS系统中适配HTTPS类型网络请求(下) 一、引言 上一篇博客详细讨论了HTTPS协议的原理，搭建HTTPS测试环境以及证书的相关基础。本篇博客将继续探讨更多在iOS开发中适配HTTPS类型请求的内容。上篇博客的地址如下： https://my.oschina.net/u/2340880/blog/807358 。 二、关于NSURLAuthenticationChallenge相关类 我们在实现URLSession的认证协议方法时，会接收到一个NSURLAuthenticationChallenge类型的参数。简单理解，这个参数就是服务端发起的一个验证挑战，客户端需要根据挑战的类型提供相应的挑战凭证。当然，挑战凭证不一定都是进行HTTPS证书的信任，也可能是需要客户端提供用户密码或者提供双向验证时的客户端证书。当这个挑战凭证被验证通过时，请求便可以继续顺利进行。NSURLAuthenticationChallenge类对象中有一个sender代理实例，开发者通过这个实例来可控采用怎样的验证方式。解析如下： //使用凭证进行验证 - (void)useCredential:(NSURLCredential *)credential forAuthenticationChallenge:(NSURLAuthenticationChallenge *

Syncing localStorage

由 六月ゝ 毕业季﹏ 提交于 2020-03-01 04:17:46
问题 I'm looking for a solution that allows a browser's localStorage to be less local, so that people can access their data on multiple devices. The traditional way is to run a database on a server and have people log in; but I'm trying to avoid doing that. I'd like the server side to be lightweight - perhaps even completely static if possible - and to not have the job of safely storing passwords, worrying about data protection etc. Many browsers have a login of some sort -- Google Account,

Syncing localStorage

由 一世执手 提交于 2020-03-01 04:14:23
问题 I'm looking for a solution that allows a browser's localStorage to be less local, so that people can access their data on multiple devices. The traditional way is to run a database on a server and have people log in; but I'm trying to avoid doing that. I'd like the server side to be lightweight - perhaps even completely static if possible - and to not have the job of safely storing passwords, worrying about data protection etc. Many browsers have a login of some sort -- Google Account,

Hibernate saveOrUpdate vs update vs save/persist

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-02-26 09:53:05
问题 I am struggling to apprehend the slight differences between the hibernate methods saveOrUpdate - update - save/persist . I know there are some similar questions on the site: What are the differences between the different saving methods in Hibernate? Difference between save and saveOrUpdate method hibernate but having read them, I did not notice an answer covering all the issues coming from using those methods in any case. I would to mention the example I have created to test: I have a table

Howto compare two entities in JPA onPreUpdate

由 。_饼干妹妹 提交于 2020-02-24 11:45:07
问题 I am working with OpenJPA 2.2.1 and would like to do the following: 1) Load an entity 2) Change the entity 3) Check the changes done before saving the entity What I've done: 1) Load the entity via EntityManager.find(MyObject.class, id); 2) Ok, pretty clear, I think, something like MyObject obj = EntityManager.find(MyObject.class, id); obj.setName("New name"); 3) Tried to evict the object from the PersistenceContext and loading it again from the database via: EntityManager.evict(MyObject.class

Flutter: best practices for persisting same widget while navigating to different screens/routes

由 核能气质少年 提交于 2020-02-23 07:37:00
问题 For the app we are making, it is required that a widget should remain active and visible while the user navigates to different screens; specifically, we need a music player widget that keeps playing music (while showing its live controls) while the user navigates to different routes, as shown in the diagram below (in the link). Flutter widget persisting during navigation Searching around, we found some hints on how to tackle this very basic use case (some suggest using the Material App's

Where to save application data in .NET application

由 坚强是说给别人听的谎言 提交于 2020-02-21 11:13:23
问题 My application is something similar to a Contact Manager. Let's say a user can enter contacts with their addresses. I have the code and technology to save my contacts to a file. But where do I save that file? Considering this is a .NET application running on Windows. Should my file end up in the AppData of the users folder? Should I use the Isolated Storage (as mentioned here)? Something else? What's the recommended practice? 回答1: I ended up using the solution Patrick suggested: Environment

MappingException: No persister for - NHibernate - Persisting an Adapter [duplicate]

由 我与影子孤独终老i 提交于 2020-02-15 19:59:59
问题 This question already has answers here : NHibernate.MappingException: No persister for: XYZ (15 answers) Closed 5 years ago . Well, I googled a lot, and found the same advices all there (set hbm as Embedded Resource, add hbm at hibernate.cfg, etc..), and despite of them, I still not get it. Let me explain: I wrote a Communication Dll for a ticket gate device, and there I have a configuration model class, that I use to configure that device through TCP/IP. But now, I have to persist this
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