persistence

Which is best data access options available for Play framework with Scala and PostgreSQL?

不问归期 提交于 2019-12-03 03:05:08
We have earlier experiences and lots of reusable code/components mostly done using Spring MVC, Hibernate, PostgreSQL database. But recently we are planning to start a new project. We decided to use Play framework with Scala. We are new in Play framework with Scala. Thus we couldn't decided what ORM (Object-relational mapping) framework to use. Because of many reusable code, we wish to select Hibernate. We found scary words regarding Hibernate as "JPA using Hibernate in Scala with play it is probably not the best way, and it should be considered as legacy and deprecated". We are really confused

What does persistence object means in Hibernate architecture?

自作多情 提交于 2019-12-03 02:54:15
问题 Hibernate is a persistence framework which is used to persist data from Java environment to database. I am so confused, if we persist and object to a database, then why does Hibernate architecture indicate the persistent object in the middle of Application and Hibernate in picture? (source: viralpatel.net) 回答1: I will make it more clearer. Persistent objects are instances of POJO classes that you create that represent rows in the table in the database. According to hibernate-doc an instance

ehcache persist to disk issues

时光怂恿深爱的人放手 提交于 2019-12-03 02:42:33
问题 I want to do something with ehcache in Java that I think should be extremely simple, but I've spent enough time frustrating myself with the docs... Write a value to a disk persistent cache. Shut down. Start up again and read that value. Here is my Java function: private static void testCacheWrite() { // create the cache manager from our configuration URL url = TestBed.class.getClass().getResource("/resource/ehcache.xml"); CacheManager manager = CacheManager.create(url); // check to see if our

Best practice to join nhibernate and ASP.NET membership/role/profile services

你说的曾经没有我的故事 提交于 2019-12-03 02:28:07
I've got a generic ASP.NET (MVC) application, that uses NHibernate as the model persistence layer, and ASP.NET Membership/role/profile services as the user management layer. The question is what can be considered as the best practice to create linkings between the domain data and the users. (For example is I want to create a forum system I want to link each topics/posts to a specific user, and want to display the user at each request). These are the posiibilites I've been thinking of: Store the user ID in NHibernate (like having a Guid column in all your domain classes (Posts, Topics etc.)

How is HDF5 different from a folder with files?

China☆狼群 提交于 2019-12-03 00:35:47
问题 I'm working on an open source project dealing with adding metadata to folders. The provided (Python) API lets you browse and access metadata like it was just another folder. Because it is just another folder. \folder\.meta\folder\somedata.json Then I came across HDF5 and its derivation Alembic. Reading up on HDF5 in the book Python and HDF5 I was looking for benefits to using it compared to using files in folders, but most of what I came across spoke about the benefits of a hierarchical file

Persisting graph data (Java)

心已入冬 提交于 2019-12-03 00:27:29
I have an application which utilizes graph (tree-like) custom structures. The structures are not real trees, but pretty much everything is connected together. The quantity of the data is also big (millions of nodes can exist). Tree-nodes can vary in type to make it more interesting (inheritance). I don't want to alter the data-structures to accommodate the persistence storage. I want to persist this data without too much extra work. I've goggled some options to solve this problem, but couldn't find anything that fits exactly for my needs. Possible options: serialization, databases with ORM

Elisp: How to save data in a file?

一笑奈何 提交于 2019-12-02 23:07:27
I want to save data to a file in my elisp program. I have a multi-dimensional list that I want to save to a file, so I can restore it the next time my program runs. What's the easiest / best way to do this? I realise, of course, that I can simply write my data to a buffer in a custom format and then save the buffer, but then I'd have to write a function to parse that data format when I want to restore it. I'd rather not have to do that. In Python, there's the Pickle module that lets you "dump" objects to disk and restore them, very easily. Is there something similar for elisp? This ' dump-vars

How to do proper database testing (TDD) on Rails 3 using MongoDB and Mongoid

拟墨画扇 提交于 2019-12-02 22:28:58
How would go about writing proper unit testing (and integration testing for that matter) using MongoDB through Mongoid on Rails ? I am asking, because to the opposite of using let's say SQLite3, even when running tests, everything I do does persists. So for the moment I am writing the creation test and then I manually delete everything I do. But it's getting annoying and even complicated to do for integration testing. Sample of what I do: before(:each) do @user = User.create!(@attr) end after(:each) do # MongoDB is not a transactional DB, so added objects (create) during tests can't be

Create C# classes based of MySQL table

你说的曾经没有我的故事 提交于 2019-12-02 21:02:46
Is there anything built into .Net or visual studio that will allow my to create classes based off of a MySql table. I guess I am talking about persistence. I just want the class to be a 1 to 1 mapping of the table. Does anything free exist? maybe you need something like this: select 'my_table' into @table; #table name select 'my_database' into @schema; #database name select concat('public class ',@table,'{') union select concat('public ',tps.dest,' ',column_name,'{get;set;}') from information_schema.columns c join( #datatypes mapping select 'char' as orign ,'string' as dest union all select

Update an existing JobDataMap

南笙酒味 提交于 2019-12-02 20:51:07
I have a Quartz job that has already been scheduled. I want to update the JobDataMap associated with it. If I get a JobDataMap with JobDataMap jobDataMap = scheduler.getJobDetail(....).getJobDataMap() , is that map "live"? ie. if I change it, will it be persisted in the scheduler? If not, how do I persist it? See http://www.quartz-scheduler.org/docs/tutorial/TutorialLesson03.html : A Job instance can be defined as "stateful" or "non-stateful". Non-stateful jobs only have their JobDataMap stored at the time they are added to the scheduler. This means that any changes made to the contents of the