Is MariaDB4j a Truly 'In-Memory' Solution for JUnit Tests?

In-Memory MySQL for JUnit Test Cases

The process of testing services that access MySQL databases often involves recreating database schemas and importing data specific to each test case. As an alternative to relying on SQLite, H2, or other databases, a more compatible option is to utilize MySQL in-memory.

Enter MariaDB4j

MariaDB4j is a renowned project that provides an in-memory database fully compatible with MySQL, ideal for JUnit test cases. Its simplicity and ease of integration make it a preferred choice.

To harness the power of MariaDB4j, simply add the necessary dependency to your Gradle or Maven project and execute a few lines of code to initiate the process:

DB database = DB.newEmbeddedDB(3306);
database.start();
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "");

Startup Scripts and More

For additional customization, a startup script can be integrated into the process using the following line:

database.source("path/to/resource.sql");

For comprehensive information and examples, refer to the MariaDB4j GitHub readme at https://github.com/vorburger/MariaDB4j.

Caveat: Not Truly In-Memory Only

While MariaDB4j provides an in-memory database solution, it does utilize temporary system files for operation. This means it's not a true in-memory-only method, and the tests may not fully adhere to the standards of unit testing, as they may depend on external resources.

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