How to retrieve the datasource used by a persistence unit programmatically

Question

...without actually reading and parsing the persistence.xml

I can retrieve the name of the persistence unit of an EntityManager using the p

Answer 1

in SpringBoot environment you can use the following:

@PersistenceContext
EntityManager entityManager;

private HikariDataSource getDataSourceFromHibernateEntityManager() {
    EntityManagerFactoryInfo info = (EntityManagerFactoryInfo) entityManager.getEntityManagerFactory();
    return (HikariDataSource) info.getDataSource();
}

public String getDataSourceProperties() {
    HikariDataSource dataSource = getDataSourceFromHibernateEntityManager();
    return "DataSource properties:" +
            "URL: " + dataSource.getJdbcUrl() + "\n" +
            "Default Schema: " + dataSource.getPoolName() + "\n" +
            "Driver Class Name: " + dataSource.getDriverClassName() + "\n" +
            "Username: " + dataSource.getUsername() + "\n";
}