public boolean insertExperience(String personnelID, Experience exp) {
    boolean check = true;
    PreparedStatement ps;
    if (dbc.connect()) {
      try {
        String sqlQuery = "INSERT INTO " + EXPERIENCE_INFO + " VALUES(?,?,?,?,?,?,?,?,?,?,?)";
        ps = dbc.getConnection().prepareStatement(sqlQuery);
        ps.setString(1, personnelID);
        ps.setNString(2, exp.getCompName());
        ps.setNString(3, exp.getPos());
        ps.setNString(4, exp.getJob());
        if (exp.getStartDate() == null) {
          ps.setNull(5, java.sql.Types.DATE);
        } else {
          ps.setDate(5, exp.getStartDate());
        }
        if (exp.getEndDate() == null) {
          ps.setNull(6, java.sql.Types.DATE);
        } else {
          ps.setDate(6, exp.getEndDate());
        }
        ps.setNString(7, exp.getReason());
        ps.setNString(8, exp.getReferName());
        ps.setString(9, exp.getReferPhone());
        ps.setString(10, exp.getReferEmail());
        ps.setNString(11, exp.getReferPos());

        if (ps.executeUpdate() < 1) {
          check = false;
        }
      } catch (SQLException ex) {
        Logger.getLogger(PersonnelDAO.class.getName()).log(Level.SEVERE, null, ex);
      }
    }
    return check;
  }
  public ArrayList<Experience> getExperience(String personnelID) {
    ArrayList<Experience> exList = new ArrayList<>();
    PreparedStatement ps;
    ResultSet rs;
    if (dbc.connect()) {
      try {
        String sqlQuery =
            "select "
                + EXPERIENCE_COLUMN
                + " from "
                + EXPERIENCE_INFO
                + " where MaNV = '"
                + personnelID
                + "'";
        ps = dbc.getConnection().prepareStatement(sqlQuery);
        rs = ps.executeQuery();

        while (rs.next()) {
          Experience ex = new Experience();

          ex.setCompName(rs.getString(1));
          ex.setPos(rs.getString(2));
          ex.setJob(rs.getString(3));
          ex.setStartDate(rs.getDate(4));
          ex.setEndDate(rs.getDate(5));

          ex.setReferName(rs.getString(6));
          ex.setReferPhone(rs.getString(7));
          ex.setReferEmail(rs.getString(8));
          ex.setReferPos(rs.getString(9));
          ex.setID_IDENTITY(rs.getShort(10));

          exList.add(ex);
        }
      } catch (SQLException ex) {
        Logger.getLogger(PersonnelDAO.class.getName()).log(Level.SEVERE, null, ex);
      }
    }
    return exList;
  }