elephant | Persistence library that provides common data structures | SQL Database library
kandi X-RAY | elephant Summary
kandi X-RAY | elephant Summary
Today's applications store data in different places like the own process memory, SQL databases, Redis, and other NoSQL databases. Usually, the developer uses distinct code patterns for each one of these storage engines. For memory storage, primitives and simple data structures are used, like lists and hashes. And for SQL databases, the most common pattern is the repository + unit of work. While this seems like the right thing to do (since you cannot perform advanced queries on a Redis database - for instance), sometimes the developer doesn't need the specific capabilities of that engine, and so there's no need to implement the storage engine specific pattern instead of using simple data structures. For instance, there's no semantic difference between a repository GetById method and a Dictionary (hash table) TryGetValue method. But even if the application only uses the first method, probably the developer will implement something like the repository pattern for SQL data access. But what happens if the persistence layer needs to be moved to Redis or Elasticsearch? Probably, the developer will implement the repository pattern for the target engine, leaving empty some methods that are not supported (like queries on Redis). Or maybe, they will need to refactor the code that uses the storage class... The idea behind this library is to expose a common layer that can be used with multiple storage engines, while isolating the specific capabilities of each one, allowing the developer to compose the application storage infrastructure accordingly to its needs. It starts from common data structures, expanding according to the capabilities of each target engine.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of elephant
elephant Key Features
elephant Examples and Code Snippets
Community Discussions
Trending Discussions on elephant
QUESTION
I'm trying to create a simple quiz with struct. But my program here is very repetitive. How can I modify it and make it more efficient? Especially to check if the answers are correct I do not want to declare a separate variable and store it as int correct
. Thank You.
ANSWER
Answered 2021-Jun-11 at 09:50The only thing you can do is define the correct
variable in the struct itself. You can use a loop for decreasing the repetitiveness but obviously the question and the answers will have to be stored, it cannot be simplified further.
QUESTION
I have a table in postgres with a value
column that contains string arrays. My objective is to find all arrays that contain any of the following strings: {'cat', 'dog'}
ANSWER
Answered 2021-Jun-08 at 17:51You can use &&
operator to find out whether two array has been overlapped or not. It will return true only if at least one element from each array match.
QUESTION
Start with an input character string like this:
goats <- c("he gets her goat. they get her dog. i get my elephant.")
My goal is to gsub a list of search and replacement terms from a separate dataframe applied to the original chr string object (goats). Here is a very simplified example of what such a dataframe will look like.
The problem with my regex syntax is that it stops after the first row of the target list is applied to the text object. I would like to continue to loop through the target list until all terms have been exhausted. I tried:
...ANSWER
Answered 2021-Jun-06 at 02:02There are some issues in the for
loop -
1:seq_along(targlist$target)
is incorrect.seq_along(targlist$target)
already gives you the index to iterate over.- You should subset
targlist$target
andtarglist$replacement
in the loop with the row index i.ei
. - In the loop
goats
is not changing at all, you should applygsub
onnewgoat
instead.
QUESTION
I am trying to get two different choice box to work at the same time However I am getting a nullpointer error in the initialize method. which is kind of weird cuz I am trying to initialize what is in the choice box but the IDE is giving me a nullpointer exception.
this is my code
...ANSWER
Answered 2021-Jun-06 at 08:01The issue is that you never say new ChoiceBox
, so when you reference them with inputPieceType.getItems().addAll(pieces);
or inputPieceAllience.getItems().addAll(allience);
on line 62 they are calling methods for an item that was never created.
You could do something like this to initialize the objects:
QUESTION
I am trying to access the values of questionText from questions. When I am trying to extract String values from a map, the following error is displayed on Flutter. (The code is written in Dart):
The argument type 'Object?' can't be assigned to the parameter type 'String'.dart(argument_type_not_assignable)
Error:
This is my main.dart file:
...ANSWER
Answered 2021-Jun-05 at 20:09You need to let dart know the type of questions[_questionIndex]['questionText']
Try this:
Change questions[_questionIndex]['questionText']
to questions[_questionIndex]['questionText'] as String
In the error line
QUESTION
I am working on a dataset
...ANSWER
Answered 2021-Jun-04 at 21:25Just fill the titles_count
with 1 first, since they denote 1 count per row.
QUESTION
I have a list of dictionaries with questions. Need to loop over the dictionaries one at a time, can be done randomly as well. Each question has 2 parts and need to go through them separately.
For example: question - 'Am I dog?'
if the user answers 'yes'
, they should get 'bark'
, if they answer 'no'
, they should get 'what am I?'
.
The code is as follows:
...ANSWER
Answered 2021-Jun-02 at 00:05This should work. i is a dictionary itself so I did a key look-up with i.
QUESTION
I'm writing a function called apply_to_list by using the existing function sort_words to take a list of string and print each of them out in an alphabetical order. Currently, the output I have is not in a list and each string is not inside quotation marks.
Expected: Turn ["banana apple", "cat elephant dog"] into ["apple banana", "cat dog elephant"]
My output:
...ANSWER
Answered 2021-May-30 at 17:23I'd say that when you try and join strings in sort_words
you are converting a list into a string and therefor your returned value won't be a list. So instead I say you create list of the returned values of sort_words
.
I've shown how this can be possible below
QUESTION
I am Trying to make a simple game like there are so many animals images are there. I want to play a song after clicking on images. I have done that. But problem is after clicking next images the first images song should be stop then next image song will be continued. Here is the sample cide
...ANSWER
Answered 2021-May-28 at 09:12Have you tried audio.pause()
before you reassign the audio
variable?
This command may return an error the first time it's done, since audio hasn't been declared yet, but you can fix that by doing if(audio) audio.pause()
.
QUESTION
Spring provides information about the environment at the env-endpoint. I would like to simplify the output, which looks something like this:
...ANSWER
Answered 2021-May-27 at 13:51You can simply add properties
objects, though in order go get that output in return you need to take value
fields out too.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install elephant
.NET Core 3.1
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page