LiteDB | NET NoSQL Document Store in a single data file | SQL Database library
kandi X-RAY | LiteDB Summary
kandi X-RAY | LiteDB Summary
LiteDB is a small, fast and lightweight .NET NoSQL embedded database.
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Trending Discussions on LiteDB
QUESTION
I am trying to produce a method which feeds in two database (.db) files, loads them into an object which contains various string properties and a unique ID.
The db files were created from a LiteDB instance, with a unique ID assigned under the LiteDB library method, like so:
...ANSWER
Answered 2022-Mar-28 at 22:53Except has an overload that accepts an IEqualityComparer. You can implement this interface in a class in a way that ignores the ID and then pass an instance of that class to the method. See this example if you need a reference on how to implement IEqualityComparer.
QUESTION
I have a winform app with two forms, in the 1st form I query a liteDB and it manipulates an IEnumerable instance inside a using block with retrieved data.
ANSWER
Answered 2022-Mar-25 at 18:15I'm not familliar with LiteDb, but I would assume it returns a proxy object for the database. So when the database is disposed, the proxy-object is no longer usable.
The simple method to avoid the problem is to add .ToList() after the .Find(...). This will convert the proxy-list to an actual List in memory, and it can be used after the database is disposed. It is possible that the student objects inside the list are also proxies, and if that is the case this will fail.
If that is the case you either need to find some way to make the database return real, non-proxy objects, or extend the lifetime of the database to be longer than that of your form, for example
QUESTION
Given the following Person Class document and its BookBag[] subdocument Array:
...ANSWER
Answered 2022-Feb-02 at 17:08Oh I just figured out my own dilemma. The correct statement is:
col.Find("$.Bags[*].Content[*] ANY LIKE '%Apple%'");
Please correct me if there is a better way to do this.
QUESTION
This has stumped me for a few hours. I'm rewriting a Winforms desktop app to support an ASP.NET Core website. The app stores some tables locally in a LiteDB cache, and calls a "using" DBContext to get data.
The desktop app uses a TaxAccount abstract class, which is inherited by Household and Business.
On client search, the app calls GetAccount() to display a single user account. Since the DB can be slow, the cache is updated in the background. Here's the method.
...ANSWER
Answered 2022-Jan-11 at 07:14Begins tracking the given entity and entries reachable from the given entity using >the Modified state by default, but see below for cases when a different state will >be used.
Generally, no database interaction will be performed until SaveChanges() is called.
My guess is, that the Account is tracked until the changes are saved.
QUESTION
The limit size of all database and not only collections, and how claim unused space of delete data?
Update: The question is about LITEDB and no SQLITE, some people don't even ready what is about.
...ANSWER
Answered 2021-Nov-24 at 19:39Read the fine manual - it says theoretically UInt.Max * page size (4096) = 16TB.
QUESTION
I need Tendermint in one of my projects but have never used it before so I am trying to implement a very simple example from here first: https://docs.tendermint.com/master/tutorials/java.html but in C# (.NET 5.0).
(Download: Minimal Example)
I have created a simple GRPC Service trying to follow the guide as closely as possible:
Startup.cs:
ANSWER
Answered 2021-Sep-14 at 12:32[@artur's] comment got me thinking and I have finally figured it out. Actually, even before I posted this question, my first thought was that this should indeed be http, despite the documentation saying otherwise, but no, http://127.0.0.1:5020 wouldn't work. So I tried to put it in .toml file instead, I have even tried with https, but also without luck. Trying with http didn't throw any errors, unlike in the case when address was preceeded with tcp, it was just hanging on Waiting for Echo message (similarly to when pointing to the wrong address, which was weird). I've been always, eventually reverting to the tcp version. The solution was simple, remove protocol altogether...
The documentation doesn't give any clues, so for completion, at least when working with C# (.NET 5), there are 3 things that you HAVE TO DO to make it work, all of them are trivial but you have to figure them out by yourself first:
- Remove protocol from your configuration when pointing to the proxy app:
tcp://127.0.0.1:should be127.0.0.1:and YES, it will throw regardless if you have protocol specified in the.tomlfile or as a flag in the console. - The flag is
--proxy_appNOT--proxy-app. - Additionally to following the tutorial, you also have to EXPLICITLY override and implement
Info(),Echo()andInitChain(), otherwise it will throw anUnimplemented Exception.
Since my understanding of Tendermint is still scarce, the initial approach had some design issues. Here is the code for anybody facing similar problems:
QUESTION
I am using SQLite embedded in a .Net Desktop application developed with WPF.
SQLite provides a callback for any write operation performed to the database (within the same connection) ref
In this callback, it provides the following which leads to the records being affected
- Event (Insert /Update/Delete)
- Table Name
- Row Id
I am looking for a NoSQL alternative that also provides such callback and could be embedded in a desktop application targeting .Net Framework 4.8
I like the lightweight LiteDB but couldn't find data changes callback support
ANSWER
Answered 2021-Sep-11 at 16:54I ended up using the Realm Database.
Realm lets register a notification handler on a specific collection. The handler receives a description of changes since the last notification. Specifically, this description consists of three lists of indices:
- The indices of the objects that were deleted.
- The indices of the objects that were inserted.
- The indices of the objects that were modified.
Another plus point of Realm over SQLite is that these change notifications are NOT limited to changes from the same connection.
QUESTION
I have a LiteDb database on which I would like the user to be able to run arbitrary queries (given as a string; assume that we demand their query also always returns a string). Unfortunately I seem to be locked into always receiving the type given in the collection. For example the query
...ANSWER
Answered 2021-Jul-06 at 08:55You can use the Execute() method in your LiteDatabase instance. It basically returns you a collection of BsonValues:
QUESTION
public class TaskModel
{
[BsonId]
public ObjectId Id { get; set; }
public string Name { get; set; }
}
public class TaskViewModel
{
public string Id { get; set; }
public string Name { get; set; }
}
public class AutoMapperProfile : Profile
{
public AutoMapperProfile()
{
CreateMap()
.ForMember(dest=>dest.Id,opt=>opt.MapFrom(src=>src.Id));
CreateMap()
.ForMember(dest=>dest.Id,opt=>opt.MapFrom(src=>src.Id));
}
}
[Route("api/[controller]/[action]")]
[ApiController]
public class TaskController : ControllerBase
{
// POST: api/Task/Post
[HttpPost]
public IActionResult Post([FromForm] TaskViewModel taskViewModel)
{
taskModel.Id = taskViewModel.Id; //ERROR: Connot implicitly convert 'string' to 'LiteDB.ObjectId'
taskModel.Name = taskViewModel.name
}
}
ANSWER
Answered 2021-Feb-19 at 20:09Try this
convert string to ObjectId
QUESTION
I want to create a custom FileTarget for NLog (targeting LiteDB). I can't use the existing one since it's missing some features I need and afaik it's not compatible with the latest version of LiteDB. In my custom target I would like to use the TempDir Layout Renderer. Since NLog already has this with the FilePathLayout class, I thought I can reuse it but sadly this is declared as internal. Am I missing something? Is there any other way to use this?
My setup:
- NLog: 4.7.2
- NLog.Web.AspNetCore: 4.9.2
- ASP.NET Core 3.1
ANSWER
Answered 2020-Nov-12 at 06:27If you are writing a custom NLog target, then you can do this:
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