How to get database metadata from entity manager

Question

I have an app which is using hibernate and jpa. I need to find out which db it is connected to so that some native sql query i execute based on db say for eg. oracle and postgre

Answer 1

Based on Emmanuel answer how to do it with Spring and hibernate:

 @Repository
 public class UserRepository {

    @PersistenceContext
    private EntityManager em;

    public void getMeta() {
        org.hibernate.engine.spi.SessionImplementor sessionImp = (org.hibernate.engine.spi.SessionImplementor) em.getDelegate();
        DatabaseMetaData metadata = null;
        try {
            metadata = sessionImp.connection().getMetaData();
            ResultSet res = metadata.getColumns(null, null, "USERS", "USERNAME");
            System.out.println("List of columns: ");
            while (res.next()) {
                System.out.println(
                        "  " + res.getString("TABLE_SCHEM")
                                + ", " + res.getString("TABLE_NAME")
                                + ", " + res.getString("COLUMN_NAME")
                                + ", " + res.getString("TYPE_NAME")
                                + ", " + res.getInt("COLUMN_SIZE")
                                + ", " + res.getInt("NULLABLE"));
            }
            res.close();
            System.out.println();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}