java - 我在 getConnection() 方面遇到问题

Question

我正在制作一个注册表单，我做了所有的事情，但仍然无法连接。我希望这里有人可以提供帮助。

我的myConnection.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class myConnection {
    public static Connection getConnection() {
        Connection con = null;
        try {
            con = DriverManager.getConnection("jdbc:mysql://turtlenetwork.net/contact" + "user=IDKLMAO&password=OkIKnowYouTriedButNOLOL");
        } catch (SQLException ex) {
            // handle any errors
            System.out.println("SQLException: " + ex.getMessage());
            System.out.println("SQLState: " + ex.getSQLState());
            System.out.println("VendorError: " + ex.getErrorCode());
        }
        return con;
    }
}

注册

private void jLabelCreateMouseClicked(java.awt.event.MouseEvent evt) {                                          
        Connection con = myConnection.getConnection();
        PreparedStatement ps;
        try {
            ps = con.prepareStatement("INSERT INTO `user`(`username`, `pass`, `mail`) VALUES (?,?,?)");
            ps.setString(1, jTextField1.getText());
            ps.setString(2, String.valueOf(jPasswordField1.getPassword()));
            ps.setString(3, jTextField3.getText());
            if (ps.executeUpdate() != 0) {
                JOptionPane.showMessageDialog(null, "Account Created");
            } else {
                JOptionPane.showMessageDialog(null, "Failed");
            }
                    } catch (HeadlessException | SQLException ex) {
            Logger.getLogger(SignUp.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

这是我运行时单击“创建”按钮时收到的错误。

https://pastebin.com/ce44LYzW

它应该将所有内容写入数据库并创建该帐户。

Answer 1

Connect Java to a MySQL database

https://www.javatpoint.com/example-to-connect-to-the-mysql-database

每当你在java中建立连接时，你需要确保添加带有两个逗号的用户名和密码。

con = DriverManager.getConnection("jdbc:mysql://turtlenetwork.net/contact", "username", "password");

确保用逗号分隔用户和密码。

此外，请在此处查看 DriverManager 文档

https://docs.oracle.com/javase/8/docs/api/java/sql/DriverManager.html