将TextField值作为int类型 - JavaFx获取到数据库中

Question

我从界面获取值并在控制器中处理它们。 字符串值成功保存到数据库，但无法保存整数值。

@FXML
private TextField productId;
@FXML
private TextArea resultArea;
@FXML
private TextArea description;
@FXML
private TextField newUnitPrice;
@FXML
private TextField title;
@FXML
private TextField newQuantity;
@FXML
private TextField unitPrice;
@FXML
private ChoiceBox<String> type;
@FXML
private TextField quantity;

ObservableList<String> productType = FXCollections.observableArrayList("Food","Construction","Electric","Grocery");

int unitPriceInt;
int quantityInt;
int newUnitPriceInt;
int productIdInt;
int newQuantityInt;


public void initComponents() {
    this.unitPriceInt = Integer.parseInt(unitPrice.getText());
    this.quantityInt = Integer.parseInt(quantity.getText());
    this.newUnitPriceInt = Integer.parseInt(newUnitPrice.getText());
    this.newUnitPriceInt = Integer.parseInt(newQuantity.getText());
    this.productIdInt = Integer.parseInt(productId.getText());

}

//Insert a product to the DB
@FXML
private void insertProduct(ActionEvent actionEvent) throws SQLException, ClassNotFoundException {
    try {
        ProductDAO.insertProduct(title.getText(), type.getSelectionModel().getSelectedItem(), description.getText(), unitPriceInt, quantityInt);
        resultArea.setText("Product inserted! \n");
    } catch (SQLException e) {
        resultArea.setText("Problem occurred while inserting product item" + e);
        throw e;
    }
}

即使将字符串转换为Integer类型，值也不会绑定到变量。它们保存为0。