Question

我想将eclipse中的数据输入到Mysql的表（项目）中，该表存储项目代码，项目名称，项目描述，项目价格，项目成本和项目数量的值。我发现以下代码，这些是否有效，如果是，我应该在哪里放置这些代码？

Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/inventory","root", "1234");    // connect to database server based on localhost
PreparedStatement smt = con.prepareStatement("insert into item ( ItemCode = ?, ItemName = ?,ItemDescription = ?, ItemQuantity = ?, ItemPrice = ?, ItemCost = ? ");
smt.setString(1, code);
smt.setString(2, name);
smt.setString(3, description);
smt.setString(4, quantity);
smt.setString(5, price);
smt.setString(6, cost);
ResultSet rs = smt.executeQuery();

这是我的功能：

package test;

import java.awt.BorderLayout;
import java.awt.GridLayout;

import javax.swing.*;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;

public class Create_Item extends JPanel implements ActionListener {
    JTextField ItemCode, ItemName, ItemDescription, ItemQuantity, ItemPrice, ItemCost;
    JButton jbtSubmit;

    public Create_Item() {

        // java.awt.Container container = getContentPane();
        setLayout(new BorderLayout(5, 5));
        JPanel panel1 = new JPanel();
        panel1.setLayout(new GridLayout(6, 2, 5, 5));

        JLabel label1 = new JLabel("Item Code:");
        panel1.add(label1);
        ItemCode = new JTextField();
        panel1.add(ItemCode);

        JLabel label2 = new JLabel("Item Name:");
        panel1.add(label2);
        ItemName = new JTextField();
        panel1.add(ItemName);

        JLabel label3 = new JLabel("Item Description:");
        panel1.add(label3);
        ItemDescription = new JTextField();
        panel1.add(ItemDescription);

        JLabel label4 = new JLabel("Item Quantity:");
        panel1.add(label4);
        ItemQuantity = new JTextField();
        panel1.add(ItemQuantity);

        JLabel label5 = new JLabel("Item Price:");
        panel1.add(label5);
        ItemPrice = new JTextField();
        panel1.add(ItemPrice);

        JLabel label6 = new JLabel("Item Cost:");
        panel1.add(label6);
        ItemCost = new JTextField();
        panel1.add(ItemCost);

        add(panel1, BorderLayout.CENTER);
        JPanel panel2 = new JPanel();
        jbtSubmit = new JButton("Create Item");
        panel2.add(jbtSubmit);
        add(panel2, BorderLayout.SOUTH);
        jbtSubmit.addActionListener(this);


    }

    public void actionPerformed(ActionEvent e) {
        {
        String code = ItemCode.getText();
        String name = ItemName.getText();
        String description = ItemDescription.getText();
        String quantity = ItemQuantity.getText();
        String price = ItemPrice.getText();
        String cost = ItemCost.getText();

        if (code.equals("")) {
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JOptionPane.showMessageDialog(frame, "Item Code is missing!");
            ItemCode.requestFocusInWindow();
        }

        else if (name.equals("")) {
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JOptionPane.showMessageDialog(frame, "Item Name is missing!");
            ItemName.requestFocusInWindow();
        }

        else if (description.equals("")) {
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JOptionPane.showMessageDialog(frame, "Item Description is missing!");
            ItemQuantity.requestFocusInWindow();
        }

        else if (quantity.equals("")) {
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JOptionPane.showMessageDialog(frame, "Item Quantity is missing!");
            ItemPrice.requestFocusInWindow();
        }

        else if (price.equals("")) {
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JOptionPane.showMessageDialog(frame, "Item Price is missing!");
            ItemCost.requestFocusInWindow();
        }

        else if (cost.equals("")) {
            JFrame frame = new JFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JOptionPane.showMessageDialog(frame, "Item Cost is missing!");
            ItemCost.requestFocusInWindow();
        }
        }
    }
}

Answer 1

您的插入查询应该像

PreparedStatement smt = con.prepareStatement("insert into item ( ItemCode , ItemName ,
ItemDescription , ItemQuantity, ItemPrice , ItemCost) values(?,?,?,?,?,?) ");

将TextField中的数据插入Mysql数据库

1 个答案: