Categories
Cache Development

Want to have dedicated cache and want other processes to fetch data from this cache (Java)

I am developing Java based jobs having some business logic which would run in its own jvm and would want to have a separate cache containing frequently accessed data from database , also running in its own jvm. The jobs need to access this cache instead of hitting database. 1. Which cache can I use? […]

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Development

H2 shell not allowing to select from table

I run the shell tool of H2: java -cp h2-1.4.199.jar org.h2.tools.Shell I do: sql> show tables …> ; TABLE_NAME | TABLE_SCHEMA flyway_schema_history | PUBLIC (1 row, 19 ms) Then I want to select from that table: sql> select * from public.flyway_schema_history; Error: org.h2.jdbc.JdbcSQLSyntaxErrorException: Table “FLYWAY_SCHEMA_HISTORY” not found; SQL statement: select * from public.flyway_schema_history [42102-199] I […]

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Development

How to call Api multiple times with different parameters and then store the responses?

I’m using react with redux for a small application that shows weather forecasts and the user can save a city forecast to a favorites list. The city forecast that stored is the city’s id, so the favorites array looks like that : favoriteCities : [‘12211’, ‘43434’, ‘43435’] // each id represent a city unique id. […]

Categories
Algorithms Development

Why there are some random bytes from the openssh server while responding kex-neogitation?

I am writing a simple ssh-client in python following the specs specified here. While parsing the list of preferred kex_algorithms there are some random bytes at the start of the list, which should not be there? I am following the structure defined over here for parsing the server response. Here is the python code for […]

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Development

Why doesn’t a for-loop iterate without compound assignment operators

I am trying to replace every character of source string with “?”. If I remove += from my code, the for-loop iterates only once, and I can’t seem to follow the logic behind this. However, if I use +=, the for-loop iterates. Shouldn’t iterations have equalled the number of characters in stringExample? I mean my […]

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Development

How can assing generic (associated type require) protocol as delegate to any controller?

I have a protocol that have associatedtype named MessageType. protocol MessageProtocol: class { associatedtype MessageType func sendMessage(_ with: MessageType) } Then implemented it in the controller extension MainController: MessageProtocol{ typealias MessageType = String func sendMessage(_ with: MessageType) { // sending message } } My purpose is using the protocol as delegate in other controller like […]

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Development

Input Strings into Array and then Splitting the Strings into a Single Char Array

I am writing a program in java that allows a user to enter n and puts them strings into an array. Then, the program takes those strings and splits them up into single char characters and places those characters into a new char array. An example of what I’m trying to do is below: Input […]

Categories
Development MySQL

mysql query to display all the enum values created for a column named department?

I have a basic table named employees, with the following columns: user_id PK first_name last_name department enum(‘accounts’, ‘sales’, ‘marketing’, ‘customer support’,’billing’, ‘logistics’, ‘production’) NULL is default. project_history email password SHA1 registration_date So far ive created the database and it contains one table, ’employees’. As you can see from above its a very simple straight forward […]

Categories
CSV Development

Python3: Cannot import CSV Files into my Jupyter Notebook — See Specific Error & Screenshot Below

I have a train.csv file sitting on my Desktop that I want to import into my Jupyter notebook. The file is located at the following place: I tried the following Python code: import pandas as pd df_train = pd.read_csv(‘C:\home\pinzhi\Desktop\train.csv’) But I got the following error: FileNotFoundError: [Errno 2] File b’C:\home\pinzhi\Desktop\train.csv’ does not exist: b’C:\home\pinzhi\Desktop\train.csv’ What […]

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Development

How to split a number that split it into two digits and return with the highest value in Javascript? [on hold]

I want to create a function of a number that accepts 1 parameter in the form of numbers. The function will determine which two-digit pair of numbers is the greatest and return that number. For example, if the number is 183928, then the function will return 92, the largest two-digit pair of numbers among the […]