如何用数据库数据填充 TableView [英] How to fill up a TableView with database data

问题描述

我一直在尝试使用从数据库查询的数据加载 TableView，但似乎无法让它工作.

I've been trying to load a TableView with data queried from a database, but can't seem to get it to work.

这是我第一次尝试用数据库查询项填充 TableView - 以防我的代码看起来杂乱无章且远不理想.

This is my first attempt at trying to populate a TableView with database query items – in case my code seems mungled and far from good.

FXML 是通过 JavaFX SceneBuilder 完成的.

The FXML was done via JavaFX SceneBuilder.

这是数据库查询类:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.scene.control.TableView;

public class StudentInfo {
    static String JDBC_DRIVER = "org.h2.Driver";
    static String DB_URL = "jdbc:h2:file:C:/WAKILI/WAKILIdb";
    //  Database credentials
    static final String USER = "sa";
    static final String PASS = "";
    
    public static Connection conn = null;
    @FXML
    private TableView<StudentInfo> lovelyStudents;
    
    private ObservableList data;

    // Public static ObservableList<COA> getAllCOA(){
    public void getAllstudentInfo() {
        Statement st = null;
        ResultSet rs;
        String driver = "org.h2.Driver";

        try {
            Class.forName(driver);
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            st = conn.createStatement();
            String recordQuery = ("SELECT id, KIWI FROM KIWI");
            
            rs = st.executeQuery(recordQuery);
            while (rs.next()) {
                ObservableList row = FXCollections.observableArrayList();
                
                for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) {
                    row.add(rs.getString(i));
                    System.out.println(row);
                }
                
                data.add(row);
                
            }
            lovelyStudents.setItems(data);
            
        } catch (ClassNotFoundException | SQLException ex) {
            // CATCH SOMETHING
        }
    }
}

这是通过 JavaFX 场景生成器生成的 FXML 脚本:

This is the FXML script generated via JavaFX scene builder:

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="700.0" xmlns:fx="http://javafx.com/fxml" fx:controller="wakiliproject.SampleController">
  <children>
    <TableView prefHeight="400.0" prefWidth="700.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
      <columns>
        <TableColumn prefWidth="75.0" text="Column X" />
      </columns>
    </TableView>
  </children>
</AnchorPane>

推荐答案

这里是从数据库中填充数据到tableView的最佳方案.

Here is the best solution for the filling data to the tableView From the database.

import java.sql.Connection;
import java.sql.ResultSet;
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableColumn.CellDataFeatures;
import javafx.scene.control.TableView;
import javafx.stage.Stage;
import javafx.util.Callback;

/**
 * 
 * @author Narayan
 */

public class DynamicTable extends Application{

    //TABLE VIEW AND DATA
    private ObservableList<ObservableList> data;
    private TableView tableview;

    //MAIN EXECUTOR
    public static void main(String[] args) {
        launch(args);
    }

    //CONNECTION DATABASE
    public void buildData(){
          Connection c ;
          data = FXCollections.observableArrayList();
          try{
            c = DBConnect.connect();
            //SQL FOR SELECTING ALL OF CUSTOMER
            String SQL = "SELECT * from CUSTOMer";
            //ResultSet
            ResultSet rs = c.createStatement().executeQuery(SQL);

            /**********************************
             * TABLE COLUMN ADDED DYNAMICALLY *
             **********************************/
            for(int i=0 ; i<rs.getMetaData().getColumnCount(); i++){
                //We are using non property style for making dynamic table
                final int j = i;                
                TableColumn col = new TableColumn(rs.getMetaData().getColumnName(i+1));
                col.setCellValueFactory(new Callback<CellDataFeatures<ObservableList,String>,ObservableValue<String>>(){                    
                    public ObservableValue<String> call(CellDataFeatures<ObservableList, String> param) {                                                                                              
                        return new SimpleStringProperty(param.getValue().get(j).toString());                        
                    }                    
                });

                tableview.getColumns().addAll(col); 
                System.out.println("Column ["+i+"] ");
            }

            /********************************
             * Data added to ObservableList *
             ********************************/
            while(rs.next()){
                //Iterate Row
                ObservableList<String> row = FXCollections.observableArrayList();
                for(int i=1 ; i<=rs.getMetaData().getColumnCount(); i++){
                    //Iterate Column
                    row.add(rs.getString(i));
                }
                System.out.println("Row [1] added "+row );
                data.add(row);

            }

            //FINALLY ADDED TO TableView
            tableview.setItems(data);
          }catch(Exception e){
              e.printStackTrace();
              System.out.println("Error on Building Data");             
          }
      }


      @Override
      public void start(Stage stage) throws Exception {
        //TableView
        tableview = new TableView();
        buildData();

        //Main Scene
        Scene scene = new Scene(tableview);        

        stage.setScene(scene);
        stage.show();
      }
}

这是参考资料

谢谢..

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