Persist | Extensible typesafe storage utilising property wrappers | Wrapper library
kandi X-RAY | Persist Summary
kandi X-RAY | Persist Summary
Persist is a framework that aids with persisting and retrieving values, with support for transformations such as storing as JSON data.
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Persist Key Features
Persist Examples and Code Snippets
Lines of Code : 57License : Permissive (MIT)
Copystruct Foo {
@Persisted(key: "bar", userDefaults: .standard)
var bar = "default"
}
var foo = Foo()
foo.bar // "default"
func makeUUID() -> UUID {
print("Making UUID")
return UUID()
}
struct Foo {
@Persisted(key: "bar", userD struct Bar: Codable {
var baz: String
}
class Foo {
@Persisted(key: "bar", userDefaults: .standard, transformer: JSONTransformer())
var bar: Bar?
}
let foo = Foo()
let subscription = foo.$bar.addUpdateListener() { result in
switch r class Foo {
@Persisted(key: "foo-bar", userDefaults: .standard)
var bar: String?
}
let foo = Foo()
let subscription = foo.$bar.updatesPublisher.sink { result in
switch result {
case .success(let update):
print("New value:", u Community Discussions
Trending Discussions on Persist
QUESTION
I'm using React and Next.js with Firestore. On one page I get data from Firebase with useEffect only once the page is rendered. But since the get is kind of costly (lots of read), I want to persist the data fetched even when the user navigates to other pages and back to this page, so that I don't need to fetch again. How can I do that? Thanks!
...ANSWER
Answered 2021-Jun-15 at 19:03There are multiple ways but one good way would be to use Context, create a data store context which would store your data and then you can read from it as a single source of truth.
QUESTION
I have a WPF app, linked to a SQL-server. I am using the MVVM-light package (I do actually have Prism.Core installed, but I'm not sure if I'm using it or not.... new to MVVM).
There's a DataGrid, bound to an ObservableCollection.
I have been trying to implement the PropertyChangedEventHandler, but I can't seem to get it to work.
I have a Delete button bound, and I am able to remove rows, but when I re-open the form, the changes does not carry over.
I tried to change the binding-mode for the DataGrid from OneWay to TwoWay. With OneWay, the changes does not carry over when I re-open the form. With TwoWay, I get this error message when opening the child form (which contains the DataGrid):
System.InvalidOperationException: 'A TwoWay or OneWayToSource binding cannot work on the read->only property 'licenseHolders' of type 'Ridel.Hub.ViewModel.LicenseHoldersViewModel'.'
So, If I then add a set; to my public ObservableCollection licenseHolders { get; },
the program runs, but the previous problem persists, like it did when there was a OneWay mode configuration on the DataGrid.
What do I need to do to get this to work without communicating directly with the Sql-server, which would defy the whole point of using this methodology in the first place?
ANSWER
Answered 2021-Jun-15 at 13:26You are confusing topics. The VM needs InotifyPropertyChanged events, which you have but are not using, to notify the Xaml in the front-end that a VMs property has changed and to bind to the new data reference.
This is needed for Lists or ObservableCollections. Once that is done, the ObservableCollection will then send notifications on changes to the list as items are added or removed.
Because you miss the first step:
QUESTION
I've created a simple VBA interface to connect Excel to a MySQL DB. The VBA part acts as a preview of data for the user to choose what item he wants to import to the Excel sheet.
Until now I've work with a very complete set of data, but I got to a Table which (because of the nature of the items) some fields are NULL.
Now every time I try to check the values in the VBA I get the Run-time error 13 Type mismatch in the listview component. At first I though it was a field with DECIMAL typing, but after changing it to a DOUBLE (for testing) the problem persisted, and it was until I notice that if only checks columns with no NULL value, the problem disappears. Off course I can't omit this values.
I tried some .Tostring functions but with no success. And I failed to implement a IF to check for NULL in the obj.
This is my code:
...ANSWER
Answered 2021-Apr-13 at 10:28If you don't want to add a IsNull-function in you SQL (as Nathan_Sav suggested as a comment): There is a IsNull-function in VBA. With that, you can create a simple function that returns for example an empty string (or a 0 or whatever you prefer):
QUESTION
message = ""
Validation failed for classes [com.PointsSystem.entity.Membership] during persist time for groups [javax.validation.groups.Default, ]\nList of constraint violations:[\n\tConstraintViolationImpl{interpolatedMessage='请输入正确的手机号(11位)', propertyPath=cellPhone, rootBeanClass=class com.PointsSystem.entity.Membership, messageTemplate='请输入正确的手机号(11位)'}\n\tConstraintViolationImpl{interpolatedMessage='lastName 不能为空', propertyPath=lastName, rootBeanClass=class com.PointsSystem.entity.Membership, messageTemplate='lastName 不能为空'}\n]
""
I do not want to print this message on my web app, I need to get the key word "interpolatedMessage" which contains Chinese characters. How can I do that? This message was get when i use e.getMessage, e ment a Exception
...ANSWER
Answered 2021-Jun-15 at 07:05You have to catch or write a handler for ConstraintViolationException.
QUESTION
According to the OpenCV Docs, we can use cv::FileStorage to read/write custom data structure from/to config files (XML, YAML, JSON):
ANSWER
Answered 2021-Jun-15 at 15:05The issue is due to the intruduction of namespace, indeed you can get a similar issue with this code:
QUESTION
I'm trying to make a relation between my Book entity and a list of languages that I retrieve through a service. In my database, each book has a: ID, TITLE, CATEGORY_ID (FK), LANG_ID
Book.java:
...ANSWER
Answered 2021-Jun-15 at 12:54First of all, did you consider to store language in your database? I mean language are mostly the same, doesn't change too often, you can also store in a properties file and read them at runtime to use them later.
Anyway, I think you should:
- first get from external system languages
- store in variable / in memory cache ( like a Map where you can store id and name )
- read your data from database
- for each row you do
- read book language id, read the cache, get out data you need
- for each row you do
If you can't change model, just use a dto with your entity and the language and you're fine
QUESTION
I'm running the below sqlpackage command against my sqlserver:
ANSWER
Answered 2021-Jun-15 at 12:05I would recommend using /action:Script (see here) to see which actions it will perform, most likely this will give you some clue as to which flags should be set/cleared.
-- Edit
According to this old answer you can disable deploying the database properties when designing the .dacpac.
If you want to override this behaviour when publishing the .dacpac, you should probably use the ScriptDatabaseOptions property - see the whole list of switches here.
QUESTION
I've an model:
User(id, firstName, lastName);
I get the user from POST request in Java Spring boot framework using @ModelAttribute Annotation in the prototype.
ANSWER
Answered 2021-Jun-15 at 11:36When you use the Spring Framework, there is a serialization/deserialization happening "behind the scenes" which involves your POJOs.
For example, into this endpoint:
QUESTION
I have the below powershell script:
ANSWER
Answered 2021-Jun-15 at 09:18I would start with running sp_who2 on the database server to see if sqlpackage has made a connection to it, and if it's blocking on the server somewhere.
If so, you can further investigate with the SQL Server Profiler (can be found in the Tools menu of SQL Server Management Studio)
QUESTION
I have been stuck on a module not found error of python3. I have a VM on Microsoft Azure, a Centos 7. Then I installed python3 and pip3, and some packages I needed. But there’s one package that I just couldn’t find after I installed it
sudo pip3 install --user stockstats
But whenever i wanted to run a python script using this package, there’s
ModuleNotFoundError: No module named 'stockstats'
What I tried:
pip3 show stockstats
As I really want to see where it was installed. It shows nothing. What it is supposed to do is like this:
...ANSWER
Answered 2021-Jun-13 at 07:23- You can visit This website for Installing pip in centos 7 Pip Install In Centos 7
for maybe some errors in installing pip.
reinstall python.
check that the module name is correctly typed
install stockstats in pip like "pip install stockstats" (getten from pypi.com)
Thank You
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