将SQL Server与Java(javafx)连接
下面是SQL Server与Java的连接设置。我也在使用javafx。我对使用Java进行开发非常陌生。注意:我添加了sqljdbc驱动程序。我不想将main添加到DBConnection,因为我正在控制器中使用Connection方法。有没有办法解决这个问题,或者如何在不更改连接方法的情况下添加main方法?我收到错误消息: 错误消息将SQL Server与Java(javafx)连接,java,javafx,Java,Javafx,下面是SQL Server与Java的连接设置。我也在使用javafx。我对使用Java进行开发非常陌生。注意:我添加了sqljdbc驱动程序。我不想将main添加到DBConnection,因为我正在控制器中使用Connection方法。有没有办法解决这个问题,或者如何在不更改连接方法的情况下添加main方法?我收到错误消息: 错误消息 Error: Main method not found in class application.ConnectionDB, please define t
Error: Main method not found in class application.ConnectionDB, please define the main method as:
public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application
FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane fx:controller="application.MainController" prefHeight="407.0" prefWidth="578.0" xmlns="http://javafx.com/javafx/10.0.1" xmlns:fx="http://javafx.com/fxml/1">
<children>
<Label layoutX="123.0" layoutY="65.0" prefHeight="31.0" prefWidth="79.0" text="Date:" />
<Label layoutX="123.0" layoutY="138.0" prefHeight="25.0" prefWidth="127.0" text="Rim Current Value:" />
<Label layoutX="125.0" layoutY="210.0" text="Rim Sales Value for the Month:" />
<Label layoutX="123.0" layoutY="283.0" text="Rim Sold Cost Bought:" />
<TextField fx:id="txtdate" layoutX="123.0" layoutY="97.0" />
<TextField fx:id="txtcurvalue" layoutX="123.0" layoutY="163.0" />
<TextField fx:id="txtsalesvalue" layoutX="123.0" layoutY="234.0" />
<TextField fx:id="txtsoldcost" layoutX="123.0" layoutY="300.0" />
<Button layoutX="246.0" layoutY="340.0" mnemonicParsing="false" onAction="#Rmsubmit" prefHeight="25.0" prefWidth="103.0" text="Submit" />
</children>
</AnchorPane>
控制器
package application;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.TextField;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ResourceBundle;
import javax.print.DocFlavor.URL;
public class MainController {
@FXML
public TextField txtdate;
@FXML
public TextField txtcurvalue;
@FXML
public TextField txtsalesvalue;
@FXML
public TextField txtsoldcost;
public Connection conn =null;
public PreparedStatement pat = null;
@FXML
public void Rmsubmit(ActionEvent actionEvent) {
String sqla = "Insert into RimCalc(Date, Rim_Vale,Rim_Sales,Rim_Cost) Values (?,?,?,?)";
String date = txtdate.getText();
String rim_value = txtcurvalue.getText();
String Rim_Sales = txtsalesvalue.getText();
String rim_cost = txtsoldcost.getText();
try {
pat = conn.prepareStatement(sqla);
pat.setString(1, date);
pat.setString(2, rim_value);
pat.setString(3, Rim_Sales);
pat.setString(4, rim_cost);
int i = pat.executeUpdate();
if(i==1) {
System.out.println("Insert Successfully");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void initializer(URL url, ResourceBundle rb) {
conn = application.ConnectionDB.dbConn();
}
}
Java程序需要一个
main
方法作为入口点才能运行。main
方法的标准定义如下:
public static void main(String[] args) {
// First code of your program goes here
}
此main()
方法应包括启动应用程序并加载任何界面元素以显示的代码
JavaFX应用程序还需要有一个类来扩展应用程序
并重写其start()
方法
下面是一个此类课程的快速而肮脏的示例:
import javafx.application.Application;
import javafx.stage.Stage;
class Main extends Application {
public static void main(String[] args) {
launch(args); // Starts the JavaFX application and calls the start() method
}
@Override
public void start(Stage primaryStage) throws Exception {
// Here is where you'll initialize your views and such
}
}
我建议在尝试连接数据库等更复杂的任务之前,先学习一些Java和JavaFX教程,了解一些基本知识
import javafx.application.Application;
import javafx.stage.Stage;
class Main extends Application {
public static void main(String[] args) {
launch(args); // Starts the JavaFX application and calls the start() method
}
@Override
public void start(Stage primaryStage) throws Exception {
// Here is where you'll initialize your views and such
}
}