我在以下代码中收到错误突出显示：
ResultSet rs = stmt.executeQuery(sql);
'executeQuery' 在 netbeans 中获得“红色错误突出显示”
如何让它正常工作并让应用程序正常工作并使用数据库中的数据填充 JavaFx TableView。
这是代码的其余部分：
控制器类：
import java.beans.Statement;
import java.net.URL;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.LinkedList;
import java.util.List;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
public class TesterUIController implements Initializable {
static String JDBC_DRIVER = "org.h2.Driver";
static String DB_URL = "jdbc:h2:file:C:/MyBeautifulCherrishabledb";
static final String USER = "sa";
static final String PASS = "";
public static Connection conn = null;
@FXML
private TableView<dataClass> Table;
@FXML
private Button TestButton;
@FXML
private TableColumn<dataClass, Integer> colKey;
@FXML
private TableColumn<dataClass, String> colSalesNo;
public static void main(String[] args) {
System.out.println("Main has run");
}
@Override
public void initialize(URL fxmlFileLocation, ResourceBundle resources) {
TestButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
System.out.println("Button Pressed");
colKey.setCellValueFactory(new PropertyValueFactory<dataClass, Integer>("Key"));
colSalesNo.setCellValueFactory(new PropertyValueFactory<dataClass, String>("SalesNo"));
Table.getItems().setAll(gobbledyGook());
}
});
}
public class dataClass {
private IntegerProperty Key;
public void setKey(int value) {
KeyProperty().set(value);
}
public int getKey() {
return KeyProperty().get();
}
public IntegerProperty KeyProperty() {
if (Key == null) {
Key = new SimpleIntegerProperty(this, "Key");
}
return Key;
}
private StringProperty SalesNo;
public void setSalesNo(String value) {
SalesNoProperty().set(value);
}
public String getSalesNo() {
return SalesNoProperty().get();
}
public StringProperty SalesNoProperty() {
if (SalesNo == null) {
SalesNo = new SimpleStringProperty(this, "SalesNo");
}
return SalesNo;
}
}
private List<dataClass> gobbledyGook() {
Statement stmt = null;
List ll = new LinkedList();
try {
// STEP 2: Register JDBC driver
Class.forName(JDBC_DRIVER);
// STEP 3: Open a connection
System.out.println("Connecting to a selected database...");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
System.out.println("Connected database successfully...");
// STEP 4: Execute a query
System.out.println("Creating statement...");
stmt = (Statement) conn.createStatement();
String sql = "SELECT id, LovelyGuy FROM LOVELYPEOPLE";
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
int Key = rs.getInt(1);
double saleNo = rs.getDouble(2);
NumberFormat formatter = new DecimalFormat("###########");
String SalesNo = formatter.format(saleNo);
System.out.println(Key + ", " + SalesNo); //key + ", " + saleNo);
dataClass roww = new dataClass();
roww.setKey(Key);
roww.setSalesNo(SalesNo);
ll.add(roww);
}
} catch (ClassNotFoundException | SQLException ex) {
Logger.getLogger(TesterUIController.class.getName()).log(Level.SEVERE, null, ex);
}
return ll;
}
}
主类
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class TesterUI extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("TesterUI.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
FXML：
<?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="600.0" prefWidth="700.0" xmlns:fx="http://javafx.com/fxml" fx:controller="testerui.TesterUIController">
<children>
<Button fx:id="TestButton" layoutX="14.0" layoutY="14.0" mnemonicParsing="false" text="Button" />
<Pane layoutY="35.0" prefHeight="565.0" prefWidth="700.0">
<children>
<TableView fx:id="Table" layoutX="14.0" layoutY="14.0" prefHeight="226.0" prefWidth="672.0">
<columns>
<TableColumn prefWidth="75.0" text="Column X" fx:id="colKey" />
<TableColumn prefWidth="75.0" text="Column X" fx:id="colSalesNo" />
</columns>
</TableView>
</children>
</Pane>
</children>
</AnchorPane>
更新：
错误堆栈跟踪：
ResultSet rs = stmt.executeQuery(sql);
symbol: method executeQuery(String)
location: variable stmt of type Statement
Note: C:\Users\Revilo\Downloads\GitHub\Tables\Tablas-JavaFX--FXML--master\src\TesterUI\src\testerui\TesterUIController.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error