BookStores | Blazor Server app using ASP.NET Core | SQL Database library
kandi X-RAY | BookStores Summary
kandi X-RAY | BookStores Summary
BookStores is a Blazor Server app using ASP.NET Core as back-end service and MSSQL for database. It has code samples for Authentication, Authorization, DataGrid, Database operations....and much. Please follow the intrsuctions to set it up on your machine.
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QUESTION
I'm interested in the conceptual topic of creating rights managements systems on the the Ethereum block chain with digital assets represented by an NFT.
I am just reading up on how to write programs that run on Etherium but I have some very basic questions just to get to started.
I read that NFT are created on the Ethereum blockchain. I don't really understand if that is the same block chain on which the currency Ether is maintained? Seems like the ledger will become impossibly large huge if both the every currency transaction and every digital asset and copy thereof that migrates to Ethereum is stored in one single giant ledger and that each miner on the chain has to download the entire ledger to one single machine in order to validate transactions? Have I got big misunderstanding there? I know there is talk about "sharding" in the future, but it seems like that isn't coming very soon.
Cost of running a smart contract on the blockchain? Assuming that the we are talking about the same block chain, from what I can see the price of "Gas" is quite high. I'm reading that the price of ETH transfer from one party to another is 21,000 Gwei, about $0.03 today. Just trying to understand the basics, how much does it cost to create a NFT? And roughly how much does it cosst to execute a simple function on the blockchain (without loops). Let say the equivalent of 5 statement function which takes a few simple params, reads a few blocks, doesn't write to the block chain but just performs some simple math and a few if statements and returns a string? Does that also cost, like, more than penny? Is the conversion to ETH2 switch from proof of work to proof of stake going to bring those costs down by orders of magnitude?
- Any good resources or reference on how to write programs which create and manipulate NFTS on Etherium? Most of what I have seen in the bookstores seem to cover financial transactions with Ether.
ANSWER
Answered 2021-Mar-12 at 23:09Yes, it's the same blockchain.
You can see in the stats that full node (stores current state) currently takes about 400 GB and archive node (stores current and historical states as well) takes about 6.6 TB.
My observation is that most web apps using blockchain data don't verify and trust a third-party service running a node (such as Infura). And I believe that most end users or businesses who want/need to verify, usually have the capacity to store 400+ GB and are able to scale.
But if this amount of data is okay or "impossibly large huge", I'll leave that to your decision. :)
Deployment of a token smart contract usually costs between 500k to 3M gas. My estimate is that most token contracts with basic features that were compiled with an optimizer, cost around 1M gas to deploy. With current prices of ~200 Gwei/gas and $1800/ETH, that's about $350. But I remember just few months ago the average gas prices were ~20 and ETH cost $500, so that would be around $10. So yea, the cost of deploying a contract is very volatile.
Simple function that performs validations and transformations in memory is going to cost the base 21k + few hundred gas. (Working with memory data is cheap gas-wise, accessing the storage is much more expensive.) So in current prices around $7, few months ago it could have been $0.25.
As for the question, whether ETH2.0 is going to bring lower gas price: My opinion is that L2 (which should be released earlier than PoS) is going to have some effect on the price since it allows for sidechain transactions (similar to Lightning network on Bitcoin). But this is a development forum, so I'm not not going to dive deeper into price speculations.
I recommend OpenZeppelin docs where they cover their opensource implementations of ERC standards (including ERC-721 NFTs) or googling the topic you're interested in and read articles that catch your eye (at least that's my current approach).
And if you're new to Solidity in general, I recommend at least few chapters from CryptoZombies tutorial. In my opinion, the first few chapters are great and you'll learn a lot, but then the quality slowly fades.
QUESTION
How to make and get props in all components with the funcional component and hooks?
at example iam making a js file with class with functions inside like getBooks(), getNotes(), then i making a context file and importing this in index.js and use a class for provider value, like below.
...ANSWER
Answered 2020-Dec-26 at 04:36See useContext.
Just do
QUESTION
Suppose I only have this API that the database have provided to do queries to find which records/entities in the database are within a specific java.time.LocalTime
range
ANSWER
Answered 2020-Nov-04 at 17:57Here's how to implement the compareTo
to be abe to compare with MIN-MAX using two LocalTimeRage
:
QUESTION
I have a DB with the following schema:
...ANSWER
Answered 2020-Oct-21 at 15:33You can use aggregation:
QUESTION
I'm trying to make a simple "book signing" app on Rails (books, authors, bookstores, etc.) using single table inheritance (class Bookstore < Company
).
I have the following in config/application.rb:
config.autoload_paths += %W(#{config.root}.app/models/company)
Both company.rb and bookstore.rb are in the app/models/company directory.
Bookstore.create(name: "Barnes and Noble")
is in seeds.rb
When I run rails db:seed
I get an error uninitialized constant Bookstore
Also if I'm in the rails console and I do Bookstore.new(...)
, I get the same error, but if I do Company.new(...)
I get undefined method 'new' for Company:Module
which was surprising because I thought Company was a class:
company.rb has class Company < ApplicationRecord
How do I set up single table inheritance so that I can store classes in sub directories?
I'm using rails 5.2
Thanks!
...ANSWER
Answered 2020-Sep-03 at 12:31If you want to nest your models in a namespace you would do it like so:
QUESTION
I am using a stream builder to detect if user logged in or not.
...ANSWER
Answered 2020-Aug-10 at 11:35Your conditional Is not being tested in the sub page. You should call Provider.of in the sectionWrapper() page.
You’re saying:
- if user is logged in, build sectionWrapper widget
- if user is not logged in build Authentication widget.
That is it for that build method. Once that is built, you need to say what you want to do next.
Eg. On the next screen, above your widget tree, set provider.of like you did. Then, if the value changes, provider will force a rebuild for that screen’s build method.
QUESTION
I want to be able to return a list of strings from a deeply nested structure of data. In this scenario, I have a API that manages a chain of bookstores with many locations in different regions.
Currently, I have an API endpoint that takes a region's ID and returns a nested JSON structure of details about the region, the individual bookstores, and the books that can be found in each store.
...ANSWER
Answered 2020-Jul-08 at 12:41So you start from region you have to get the stores, so you can filter the books in the stores, here is a solution which will work.
Note:Avoid using .get()
in *APIView
because it will trigger an error if the request does not have the ID, you can use get_object_or_404()
, but then you cannot log your error in Sentry.
To get an element from an *APIView
, use filter()
.
QUESTION
I would like to have help in extracting a particular XML file block from an XML file and copy it to another file using Python 3.8. I tried all the answers of similar questions. Unfortunately, I could not make it. Any help will be greatly appreciated.
Sample XML File
...ANSWER
Answered 2020-Jan-07 at 08:39You can try:
QUESTION
I have various restaurant labels with me and i have some words that are unrelated to restaurants as well. like below:
vegan
vegetarian
pizza
burger
transportation
coffee
Bookstores
Oil and Lube
I have such mix of around 500 labels. I want to know is there a way pick the similar labels that are related to food choices and leave out words like oil and lube, transportation.
I tried using word2vec but, some of them have more than one word and could not figure out a right way.
Brute-force approach is to tag them manually. But, i want to know is there a way using NLP or Word2Vec to cluster all related labels together.
...ANSWER
Answered 2019-Aug-17 at 14:49Word2Vec could help with this, but key factors to consider are:
How are your word-vectors trained? Using off-the-shelf vectors (like say the popular
GoogleNews
vectors trained on a large corpus of news stories) are unlikely to closely match the senses of these words in your domain, or include multi-word tokens like 'oil_and_lube'. But, if you have a good training corpus from your own domain, with multi-word tokens from a controlled vocabulary (likeoil_and_lube
) that are used in context, you might get quite good vectors for exactly the tokens you need.The similarity of word-vectors isn't strictly 'synonymity' but often other forms of close-relation including oppositeness and other ways words can be interchangeable or be used in similar contexts. So whether or not the word-vector similarity-values provide a good threshold cutoff for your particular desired "related to food" test is something you'd have to try out & tinker around. (For example: whether words that are drop-in replacements for each other are closest to each other, or words that are common-in-the-same-topics are closest to each other, can be influenced by whether the
window
parameter is smaller or larger. So you could find tuning Word2Vec training parameters improve the resulting vectors for your specific needs.)
Making more recommendations for how to proceed would require more details on the training data you have available – where do these labels come from? what's the format they're in? how much do you have? – and your ultimate goals – why is it important to distinguish between restaurant- and non-restaurant- labels?
QUESTION
I was with the similiar topic some time ago. I'm looking at my app and I think it has a lot of unnecessary code. What I mean is I have service that is responsible for scraping data from different categories of books from two bookstores. Right now I have 5 categories so I have 5 methods, but what if I'm gonna add some new categories? I will have to add more methods... and I think it is not a good option. Right now it looks like this:
Controller
...ANSWER
Answered 2019-Aug-06 at 21:04Implement the Chain Of Responsibility pattern and allow services to fetch and put the results to the result Map
object. Also let the Spring to make some magic with autowiring Services by providing some common interface
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install BookStores
To create the data run SQL query from BookStores/Database/GenerateData.sql
Open project BookStores/BookStoresWebAPI/BookStoresWebAPI.sln
Run Project through Visual Studio/Terminal
Go to https://localhost:5001/swagger or https://localhost:44315/swagger
Open Project BookStores/BlazorServerApp/BlazorServerApp.sln
Run Project through Visual Studio/Terminal
Go to https://localhost:6001/ or https://localhost:44391/
Click on login. You should get logged in as philip.cramer@gmail.com
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