db4o

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Using LINQ to query nested classes in db4o?

Run into a tricky problem with db4o and a simple nested structures. Problem: when I use LINQ to pull data out of db4o, its pulling out too much data (i.e. the \"where\" clause doesn\'t seem to be wor[详细]

2023-02-13 04:02 分类：问答
unsupported class hierarchy change in Db4o

I have: static class Db4o... and: class Db4oBase... // which uses Db4o class where I can: class Customer : Db4oBase[详细]

2023-02-04 20:55 分类：问答
android db4o deactivate object properly

the way i\'m using db4o is really just read-only.I will package a db with the application and do some background updating to it开发者_开发百科 every now and again which i can handle differently.But fo[详细]

2023-02-04 20:01 分类：问答
How do you exclude a property in a persistent object in db4o using C#?

Since \"[Transient]\" does not开发者_运维百科 really work on properties. What do I do now?db4o doesn\'t care about properties. It cares about fields.[详细]

2023-01-30 13:30 分类：问答
Do I have to re-apply db4o configuration settings (and indexes) on each application run, or only on database creation?

I\'m in the process of evaluating db4o and I have a pretty simple question. Does the db4o configuration settings (e.g. Transparent Activation) and indexes need to be setup each time the application ru[详细]

2023-01-28 22:49 分类：问答
db4o SODA compare field values

class SomeClass { private DateTime fieldA; private DateTime fieldB; } Using SODA, what is the proper way to select all objects whose fieldA is greater than fieldB?[详细]

2023-01-24 23:31 分类：问答
Storing TimeSpan in db4o

I know that TimeSpan\'s are immutable. I have a object which contains a TimeSpan field. This field is updated frequently. Every time I update the object in the db, db4o updates the TimeSpan field. So[详细]

2023-01-22 20:24 分类：问答
How do you change the schema in an OO database such as DB4O?

Just getting started with DB4O object oriented database. I\'m very familiar with SQL, if I upgrade the app and add a new field I just go into a SQL manager, change the 开发者_高级运维schema, and init[详细]

2023-01-22 07:27 分类：问答
JDO not retrieving/persisting a collection

I have the following data model class defined: @PersistenceCapable public class TestSerializableModelObj {[详细]

2023-01-22 05:04 分类：问答
Scala Set implementation to use within business model?

Let\'s say we want to build a big social network (because social networks are all the rage at the moment). We\'ll start with a simple premise that anyone who wants to use our social network should be[详细]

2023-01-21 21:32 分类：问答