Question

我试图将数据库表中的内容添加到TableView中，但是我得到了一个空表。
这是我尝试使用的Java代码。我在表中使用了ID为txtdate，txthcd，txtgross，txtnet的4列。我的TableView的ID是表格。

package sample.Controllers;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import sample.Entities.MemberScreenModel;
import sample.Entities.PreviousRecordModel;
import sample.Records;
import sample.SqliteConnection;

import java.net.URL;
import java.sql.*;
import java.util.ResourceBundle;

public class PreviousRecordController implements Initializable {

MemberScreenModel model = new MemberScreenModel();

Connection connection;
ResultSet rs=null;
PreparedStatement ps=null;

java.sql.Date date;
float hcd;
int gross;
float net;

private String memberid =(new MemberScreenModel()).getMemberid();

public PreviousRecordController()   {
    connection = SqliteConnection.Connector();
    if(connection == null)
        System.exit(1);
}


@FXML private TableView<Records> table;
@FXML private TableColumn<Records, java.sql.Date> txtdate;
@FXML private TableColumn<Records, Float> txthcd;
@FXML private TableColumn<Records, Integer> txtgross;
@FXML private TableColumn<Records, Float> txtnet;

@FXML private Label txtmemid, txtname;

//private ObservableList<Records> records = FXCollections.observableArrayList();

@Override
public void initialize(URL location, ResourceBundle resources){

    txtmemid.setText(model.getMemberid());
    txtname.setText(model.getName());

    txtdate.setCellValueFactory(new PropertyValueFactory<>("DATE"));
    txthcd.setCellValueFactory(cellData -> cellData.getValue().getHCD().asObject());
    txtgross.setCellValueFactory(cellData -> cellData.getValue().getGROSS().asObject());
    txtnet.setCellValueFactory(cellData -> cellData.getValue().getNET().asObject());

    try {
        ObservableList<Records> records = getRecord();
        table.setItems(records);
    }
    catch ( Exception e)    {
        System.out.println("Seting table: "+e);
    }

    //table.getColumns().addAll(txtdate, txthcd, txtgross, txtnet);
}


public  ObservableList<Records> getRecord() throws SQLException, ClassNotFoundException {

    table = new TableView<>();
    String query = "Select `Date`, `HcDifferential`, `Gross`, `Net` from `PlayingData` where `Memberid`= ?";

    try {
        ps = connection.prepareStatement(query);
        ps.setString(1, memberid);
        rs = ps.executeQuery();

        ObservableList<Records> records = getObjects(rs);

        ps.close();
        rs.close();
        connection.close();
        return records;
    }

    catch ( Exception e ) {
        System.out.println("Error while extracting Records: " + e);
        throw e;
    }

}

public ObservableList<Records> getObjects(ResultSet rs) throws SQLException {
    try {

        ObservableList<Records> records = FXCollections.observableArrayList();

        while (rs.next())   {

            Records rec = new Records();
            rec.setDate(rs.getDate("Date"));
            rec.setHcd(Math.round(rs.getFloat("HcDifferential") *10.0f)/10.0f);
            rec.setGross(rs.getInt("Gross"));
            rec.setNet(rs.getFloat("Net"));
            records.add(rec);
        }
        return records;
    }
    catch ( Exception e )   {
        System.out.println("Exception in getObjects in PreviousRecord: "+e);
        throw e;
    }
}

}

Records类的代码为：

package sample;

import javafx.beans.property.FloatProperty;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleFloatProperty;
import javafx.beans.property.SimpleIntegerProperty;

import java.sql.Date;

public class Records {

private Date date;
private FloatProperty hcd;
private IntegerProperty gross;
private FloatProperty net;

public Records() {
    //this.date = date;
    this.hcd = new SimpleFloatProperty();
    this.gross = new SimpleIntegerProperty();
    this.net = new SimpleFloatProperty();
}

public void setDate(Date date) {
    this.date = date;
}

public void setHcd(float hcd) {
    this.hcd.set(hcd);
}

public void setGross(int gross) {
    this.gross.set(gross);
}

public void setNet(float net) {
    this.net.set(net);
}


public FloatProperty getHCD()   {
    return hcd;
}
public IntegerProperty getGROSS()   {
    return gross;
}
public FloatProperty getNET()   {
    return net;
}

public Date getDate() {
    return date;
}

public Float getHcd() {
    return hcd.get();
}

public Integer getGross() {
    return gross.get();
}

public Float getNet() {
    return net.get();
}

}

我没有收到任何异常，数据库连接设置正确，并且ResultSet能够获取所有值。我只能将这些值添加到TableView中。

从数据库中获取数据并插入JavaFX中的tableview

0 个答案: