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I have 2 suggestions for future db4o [.NET] versions.
1. I have one persistent class, which stores data in an array. It does so because I don't know what properties will be stored at compile-time. But at run-time I know that, for example, data[0] = 'first name', data[1] = 'last name', data[2] = 'address' and so on. Now, db4o doesn't (?) ...
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Hot of the presses! A new project just hit our main .net repository: Db4objects.Db4o.Linq. An optimizing linq provider for db4o.
Linq expressions are analyzed and optimized down to db4o's fast querying interface: SODA. Whenever a suitable translation cannot be found the query executes as a plain Linq for Objects query (a predicate that is tested ...
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Bytecode analysis and enhancement becomes increasingly important as we strive to improve on persistence transparency. The expressiveness of mainstream languages of the day just won't cut it.
Db4oTool.exe is the swiss army knife of the transparency inclined.
Native Queries
The first big step towards transparency was the language integrated ...
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We would like to use an Object Database, as part of a high frequency data .NET application, to store 50GB of data per day, 5 days a week. (We would be storing 512 bytes objects at rates of up to ~3MB of data per second, we expect to store 10 Terabytes a year)
We are worried regarding db4o maximum dbsize limit, 254GB, which would ...
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As my my first db4o project, I am trying to organize all my digital photographs.
I have Media class, with Photo class derived from it. In the Photo class I have a datetime field and a .NET List of Person class.
One of my eventual desires is to know a count of the people in photos as a total and for some time period.
Is ...
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So, here's the code:
public static IEnumerable<Alias> GetFromParent(HasAliases parent) {
Query query = _db.Query();
query.Constrain(typeof(Alias));
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Hi,
Sorry for late feedback - I have been busy with other development. Just wanted to summarize:
- On the original question about OR union and custom evaluators - I solved my problem by running several queries and then using collections and operating on them to make the OR or AND. Maybe not as quick and politically correct, but it gets the job ...
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