private void insertEmployeeIntoTable(Employee employee) {
        Object[] fields = new Object[7];
        fields[0] = employee.getEmployeeNumber();
        fields[1] = employee.getFirstName();
        fields[2] = employee.getInsertion().isEmpty() ? "" : employee.getInsertion();
        fields[3] = employee.getFamilyName();
        fields[4] = employee.getContractType().toString();
        fields[5] = employee.getEmployeeType().toString();
        fields[6] = employee.getContractHours();
        model.addRow(fields);
        for (int i = 0; i < tblEmployee.getColumnCount(); i++) {
            tblEmployee.getColumnModel().getColumn(i).setCellRenderer(new WhiteRenderer());
        }
    }