java—如何用数据库数据填充表视图

nfzehxib 于 2021-06-18 发布在 Mysql

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我一直在尝试加载一个表视图，其中包含从数据库查询的数据，但似乎无法使其工作。
这是我第一次尝试用数据库查询项来填充数据库，以防我的代码看起来很枯燥而且不太好。
fxml是通过javafxscenebuilder完成的。
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：

<?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>

Java sql javafx tableview

来源：https://stackoverflow.com/questions/53580922/javafx-dynamicly-filled-tableview-doesnt-show-data

3条答案

按热度按时间

wz8daaqr1#

如果数据库包含不同类型的数据，而不仅仅是字符串，那么列类型分配最好是动态的：

package sample;

import javafx.application.Application;
import javafx.beans.property.*;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Stage;
import java.sql.*;
import java.util.ArrayList;
import java.util.TimeZone;

//Author: Yerbol
//SQL database "sqlbase_schema" contains a Table "sqlbase_table" with 3 columns: "id" (Integer(INT(11))), "name" (String(VARCHAR(45))), "married" (Boolean(TINYINT(1)));

public class Main extends Application {
    private TableView<Person> tableView = new TableView<>();

    @Override
    public void start(Stage primaryStage) throws SQLException, ClassNotFoundException {
        //Show window
        buildData();
        Parent root = tableView;
        primaryStage.setScene(new Scene(root, 300, 275));
        primaryStage.show();
    }

    public void buildData() throws ClassNotFoundException, SQLException {

        Connection dbConnection;
        //SQL Database connection params
        String dbHost = "localhost";
        String dbPort = "3306";
        String dbUser = "root";
        String dbPassword = "12345";
        String dbName = "sqlbase_schema";
        String dbTableName = "sqlbase_table";
        String select = "SELECT * FROM " + dbTableName;
        String connectionString = "jdbc:mysql://" + dbHost + ":" + dbPort +"/" + dbName+"?useLegacyDatetimeCode=false&amp&serverTimezone=" + TimeZone.getDefault().getID();
        Class.forName("com.mysql.cj.jdbc.Driver");

        //Connecting to Database
        dbConnection = DriverManager.getConnection(connectionString, dbUser, dbPassword);

        //Extracting data from Databasee
        ResultSet resultSet = null;
        try {
            PreparedStatement preparedStatement = dbConnection.prepareStatement(select);
            resultSet = preparedStatement.executeQuery();

        } catch (SQLException e) {
            e.printStackTrace();
        }

        ObservableList dbData = FXCollections.observableArrayList(dataBaseArrayList(resultSet));

        //Giving readable names to columns
        for(int i=0 ; i<resultSet.getMetaData().getColumnCount(); i++) {
            TableColumn column = new TableColumn<>();
            switch (resultSet.getMetaData().getColumnName(i+1)) {
                case "id":
                    column.setText("ID #");
                    break;
                case "name":
                    column.setText("Person Name");
                    break;
                case "married":
                    column.setText("Marital Status");
                    break;
                default: column.setText(resultSet.getMetaData().getColumnName(i+1)); //if column name in SQL Database is not found, then TableView column receive SQL Database current column name (not readable)
                    break;
            }
            column.setCellValueFactory(new PropertyValueFactory<>(resultSet.getMetaData().getColumnName(i+1))); //Setting cell property value to correct variable from Person class.
            tableView.getColumns().add(column);
        }

        //Filling up tableView with data
        tableView.setItems(dbData);
    }

    public class Person {

        IntegerProperty id = new SimpleIntegerProperty(); //variable names should be exactly as column names in SQL Database Table. In case if you want to use <int> type instead of <IntegerProperty>, then you need to use getter/setter procedures instead of xxxProperty() below
        StringProperty name = new SimpleStringProperty();
        BooleanProperty married = new SimpleBooleanProperty();

        public IntegerProperty idProperty() { //name should be exactly like this [IntegerProperty variable name (id) + (Property) = idProperty] (case sensitive)
            return id;
        }

        public StringProperty nameProperty() {
            return name;
        }

        public BooleanProperty marriedProperty() {
            return married;
        }

        public Person(int idValue, String nameValue, boolean marriedValue) {
            id.set(idValue);
            name.set(nameValue);
            married.set(marriedValue);
        }

        Person(){}
    }

    //extracting data from ResulSet to ArrayList
    private ArrayList dataBaseArrayList(ResultSet resultSet) throws SQLException {
        ArrayList<Person> data =  new ArrayList<>();
        while (resultSet.next()) {
            Person person = new Person();
            person.id.set(resultSet.getInt("id"));
            person.name.set(resultSet.getString("name"));
            person.married.set(resultSet.getBoolean("married"));
            data.add(person);
        }
        return data;
    }

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

在这个示例中，sql数据库“sqlbase\u schema”包含一个表“sqlbase\u table”，其中有3列：“id”（integer（int（11））），“name”（string（varchar（45））），“married（boolean（tinyint（1））））；

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35g0bw712#

public TableView queryToTable(String sql) {
    TableView result = new TableView();
    ObservableList data = FXCollections.observableArrayList();

    jdbcTemplate.query(sql, (rs)->{
        for(int i=0 ; i<rs.getMetaData().getColumnCount(); i++){
            final int j = i;
            TableColumn col = new TableColumn(rs.getMetaData().getColumnName(i+1));
            col.setCellValueFactory(new Callback<TableColumn.CellDataFeatures<ObservableList,String>,ObservableValue<String>>(){
                public ObservableValue<String> call(TableColumn.CellDataFeatures<ObservableList, String> param) {
                    return new SimpleStringProperty(param.getValue().get(j).toString());
                }
            });
            result.getColumns().addAll(col);
        }

        while(rs.next()){
            ObservableList<String> row = FXCollections.observableArrayList();
            for(int i=1 ; i<=rs.getMetaData().getColumnCount(); i++)
                row.add(rs.getString(i));
            data.add(row);
        }
        return null;
    });
    return result;
}

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bbuxkriu3#

下面是将数据从数据库填充到tableview的最佳解决方案。

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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java—如何用数据库数据填充表视图

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