How Environment works in docker

Hi, I am new to docker in general and I have a question regarding environment in docker-compose.

I have a mariadb image and a java image that has my application.

when setting the environment for mariadb I use


and when setting the database connection for my spring app

   spring.datasource.url: "jdbc:mariadb://bar:3306"

My question is why for mariadb I use ’ - ’ and ’ = ', and for spring I do not use ’ - ’ and ’ = '.

I tried setting the spring environment the same way I did in mariadb and it did not work

I closed this topic, as you already created an identical topic:

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