persistence

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Persistent parameter in Rails controller

is there any way to persist (preserve) parameters in Rails controller? It should be passed to every action, then to every view and every link.[详细]

2023-03-25 02:12 分类：问答
Retrieving records from MySQL DB returns Null <Beginner question>

Question 1. I am using Netbeans 6.9.1 glassfish 3.1 . I am trying to retrieve some values from 开发者_开发百科the MySQL DB and save it on a List. My code as follows;[详细]

2023-03-23 20:30 分类：问答
What are my storage options when writing Rack middleware for Rails applications?

Assuming my Rack middleware is designed specifically for Rails applications, what storage options d开发者_开发问答o I have? For instance, is there a way for me to read from / write to the Rails cache?[详细]

2023-03-23 20:23 分类：问答
Criteria API: query.from returns only null

I\'m pretty new to Criteria API, as a matter of fact I just pushed our latest project to JBoss 6 and JPA 2.0 just for the Criteria API.[详细]

2023-03-23 17:30 分类：问答
Merging an object with FetchType.EAGER relation leads to "FailedObject"

I have an entity VM with a relationship to another entity BP. The relationship is eagerly fetched. First I load a VM. After loading the VM is detached, serialized and changed at the client side. Now I[详细]

2023-03-23 11:54 分类：问答
Java applet static class

my problem is store some user inputs in applet to reduce user operations. I use static fields for that. But I noticed, that if user goes to several tabs in browser - thr new \"thread\" (or something l[详细]

2023-03-23 10:42 分类：问答
error updating parent-child relationship using Hibernate-JPA

My Hibernate-JPA domain model has these entities: AttributeType ------< AttributeValue The relevant Java classes look like this (getters and setters omitted):[详细]

2023-03-23 07:18 分类：问答
Application class can be used for store data? (persistent data)

I\'m trying to use Android Application class (MyApplication.java) for store data in some ArrayLists of strings and ints[详细]

2023-03-22 16:27 分类：问答
How to change parent of an object in JDO?

I am using JDO and google app engine. I have User class which has an arrayList of area objects. Every area object has an arrayList of Location objects which tells about coordinates. Now i want to move[详细]

2023-03-22 09:56 分类：问答
Android model for persisting / loading / deleting objects

I\'ve been making an app on my free time for Android. I was looking your advice on to how store some data objects I have.[详细]

2023-03-22 09:37 分类：问答