JUnit testing SQL querries.

So I'm working on a project and we are required to create some test cases. I have sql database and parsing data there with querries like :

public Contractor create(String name, String address, String email, String phone, String city, int cvr) throws SQLException{
    Contractor contractor = new Contractor(name, address, email, phone, city, cvr);
    String sql = String.format("INSERT INTO person (name, address, email, phone, city, category) VALUES ('%s', '%s', '%s', '%s', '%s', 2)", name, address, email, phone, city);
    try{
        Connection conn = DBConnection.getInstance().getDBcon();
        conn.createStatement().executeUpdate(sql);

        String sql2 = "SELECT TOP 1 id FROM Person ORDER BY id DESC";
        ResultSet rs = conn.createStatement().executeQuery(sql2);

        if(rs.next()) {
            String sql3 = "INSERT INTO contractor (cvr, person_id) VALUES (2666,"+rs.getInt("id")+")";
            conn.createStatement().executeUpdate(sql3);
        }else{
            throw new SQLException();
        }

    } catch (SQLException e){
        e.printStackTrace();
    } finally {
        DBConnection.closeConnection();
    }
    return contractor;
}    

how would the test with JUnits look like?