Suggestions for native testing the following piece of code

bool Methods::InsertNewPatientDetails(CString m_FirstName, CString m_LastName, CString m_DateOfBirth, CString m_ContactNo)  //method to insert new patient details in db
{
    try
    {
        if (DBConnection()) //check if DB is connected
        {
            m_SqlStr.Format(_T("insert into PatientDetails(firstname,lastname,date_of_birth,contact_no,is_deleted) values ('%s','%s','%s','%s','0')"), (m_FirstName),(m_LastName), (m_DateOfBirth), (m_ContactNo)); //query to insert data to DB
            m_CDatabase.ExecuteSQL(m_SqlStr);   //executes DB query
            m_CDatabase.Close();    //close db connection
            return true;
        }
        else
        {
            return false;
        }
    }
    catch (CDBException *e)
    {
        return false;
        AfxMessageBox(L"Database Error: " + e->m_strError);
    }
}