javafx表视图未显示数据库中的任何数据

Question

我通过javafx创建了一个图书管理应用程序。通过这个应用程序，我们可以执行添加，搜索和删除操作。对于搜索，我使用表视图来获取用户搜索的书的所有详细信息。所以最后我得到的结果显示在控制台中，但不是在表格视图中显示

   package Managemnet;

   import java.sql.Connection;

   import java.sql.ResultSet;
   import java.sql.SQLException;


  import connection.*;
  import javafx.collections.FXCollections;
  import javafx.collections.ObservableList;
  import javafx.fxml.FXML;

  import javafx.scene.control.Button;

  import javafx.scene.control.TableColumn;
  import javafx.scene.control.TableView;
   import javafx.scene.control.TextField;
  import javafx.scene.control.cell.PropertyValueFactory;
  import javafx.scene.layout.AnchorPane;

   public class Searching {



Connection connect;
@FXML
TableView<Book> search_view ;
@FXML
ObservableList<Book> observeList;

@FXML
TableColumn<Book, Integer> Book_I;
@FXML
TableColumn<Book, String> Book_n;
@FXML
TableColumn<Book, String> publish;
@FXML
TableColumn<Book, Integer> ye;
@FXML
TextField sea_Book_name;
@FXML
TextField sea_pub;
@FXML
TextField sea_year;
@FXML
AnchorPane SearchPane;
@FXML
Button search;

public void search() throws ClassNotFoundException, SQLException{

    Sql_querry sql=new Sql_querry();
    sql.connect_sql();
    connect=sql.getConnect();
    observeList =FXCollections.<Book>observableArrayList();
    search_view=new TableView<Book>();

    Book_I=new TableColumn<Book ,Integer>();
    Book_I.setCellValueFactory(new PropertyValueFactory<Book ,Integer>
    ("Book_id"));

    Book_n=new TableColumn<Book ,String>();
    Book_n.setCellValueFactory(new PropertyValueFactory<Book ,String>
    ("Book_name"));

    publish=new TableColumn<Book ,String>();
    publish.setCellValueFactory(new PropertyValueFactory<Book ,String>
    ("Publisher"));

    ye=new TableColumn<Book ,Integer>();
    ye.setCellValueFactory(new PropertyValueFactory<Book ,Integer>("year"));



    String s1= sea_Book_name.getText();
    String s2= sea_pub.getText();
    String s= sea_year.getText();

    int s3;
    if(!s.isEmpty()){
        s3=Integer.parseInt(s);
    }
    else s3=0;

    ResultSet res;

    Answer_from_dataset obj= new Answer_from_dataset();
    res=obj.getAnswer(s1, s2, s3);

    while(res.next()){

    observeList.add(new Book(res.getInt(1), res.getString(2), 
    res.getString(3), res.getInt(4)));
    //System.out.println(observeList);
     }
    search_view.setItems(observeList);
    System.out.println(search_view);

        }

      package Managemnet;

      import javafx.beans.property.SimpleIntegerProperty;
     import javafx.beans.property.SimpleStringProperty;

 public class Book {

 SimpleStringProperty Book_name;
 SimpleStringProperty Publisher;
 SimpleIntegerProperty Book_id;
 SimpleIntegerProperty year;

public Book(int book_id, String book_name, String publisher, int year) {

    this.Book_name =new SimpleStringProperty(book_name);
    this.Publisher =new SimpleStringProperty(publisher);
    this.Book_id =new SimpleIntegerProperty (book_id);
    this.year = new SimpleIntegerProperty(year);

}

public String getBook_name() {
    return Book_name.get();
}

public String getPublisher() {
    return Publisher.get();
}

public Integer getBook_id() {
    return Book_id.get();
}

public Integer getYear() {
    return year.get();
}

public void setBook_name(String book_name) {
    Book_name.set(book_name);
}

public void setPublisher(String publisher) {
    Publisher.set(publisher);;
}

public void setBook_id(int book_id) {
    Book_id.set(book_id);;
}

public void setYear(int year) {
    this.year.set(year);;
}
@Override
public String toString() {
    return getBook_id() + " " + getBook_name() + " " + getPublisher() + " " 
+ getYear();
}






   }

Answer 1

因此，当我使用JavaFX进行第一个项目时，我就遇到了FXML的问题。

我尝试了很多使用FXML的解决方案，但是这花费了时间，并且没有任何效果。因此，我转而使用POJO。这可能不是您想要的理想选择，但在创建表时会给您带来很大的灵活性。

理想情况下，您要创建TableView的表本身

TableView<Book> table = new TableView();

然后为要创建TableColumn的每一列。现在，在这里您需要小心

TableColumn<Book, String> col1 = new TableColumn<>("Name");
col.setCellValueFactory(data -> new SimpleStringProperty(data.getValue().getName()));

尖括号中的值为