Java: Pass By Value or Pass By Reference
Data is shared between functions by passing parameters. Now, there are 2 ways of passing parameters: Passing by value: this method copies the value of actual parameter. The called function […]
Author: mee
Return Distinct Values for an Array Field
The following example returns the distinct values for the field sizes from all documents in the Collection1 collection: This will be the expected result: Distinct, as for relational database, finds […]
Algorithm complexity and Big O notation
Every system transform data into output and that’s why is important to understand the efficiency of our algorithms and data structures according to each solution. Big O Notation measures the […]
SARS-CoV-2 e Disinfezione delle strade
TL;DR (se avete fretta, cosa che è assolutamente errata quando ci si deve informare, saltate subito alla parte finale con scritto MORALE). Torno sull’argomento. Fin da subito mi sono schierato […]
Spring 4+ with Ehcache 3.x
This post describes an example of using Ehcache with a Spring MVC application deployed on Tomcat (not using Spring boot). It is a legacy app that needs to be upgraded. […]
React.js: fill options of Autocomplete with API results
The autocomplete is a normal text input enhanced by a panel of suggested options. Autocomplete is a feature that helps in predicting the rest of the word typed by a […]
Mongo Replica set with docker-compose
A replica set in MongoDB is a group of mongod processes that maintain the same data set. Replica sets provide redundancy and high availability and are the basis for all production deployments. Replication provides redundancy and […]
Java: Sort a list of objects according to matching string/pattern
I need to sort a list of objects in which the matching items come up and others will go down so. For instance, a list of objects on which all […]
Global warming e inquinamento in genere
L’ecologia mi sta a cuore, il pericolo che corriamo è concreto. Sensibilizzare le masse su tale pericolo è fondamentale e lottare perché si trovi una soluzione è quantomeno doveroso. È giusto però […]
Import SQL file using pgAdmin
I have a docker Postgres image and I want to import the data from another Postgres db. The first thing I have done is to create a pg_dump on the […]