Question

我正在创建一个“注册”表单，我已完成所有操作，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);
        }
    }

这是我运行时遇到的错误，单击“创建”按钮。

https://pastebin.com/ce44LYzW

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

每当在Java中建立连接时，都需要确保在用户名和密码中添加两个逗号。

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

确保用逗号分隔用户名和密码。

另外，请在此处查看DriverManager文档

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

Answer 2

我设法自己解决了这个问题。这是新的myConnection.java

$value=["wccpf_carton_weight_1"]

然后还有我也更改过的SignUp。

package ContactList;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Properties;

public class myConnection {
    // Init Database Constants
    private static final String DATABASE_DRIVER = "com.mysql.jdbc.Driver";
    private static final String DATABASE_URL = "jdbc:mysql://localhost:3306/contact";
    private static final String USERNAME = "NOPE";
    private static final String PASSWORD = "NOPE";
    private static final String MAX_POOL = "250";

    // Init Connection Object
    private Connection connection;
    // Init Properties Object
    private Properties properties;

    // Create Properties
    private Properties getProperties() {
        if (properties == null) {
            properties = new Properties();
            properties.setProperty("user", USERNAME);
            properties.setProperty("password", PASSWORD);
            properties.setProperty("MaxPooledStatements", MAX_POOL);
        }
        return properties;
    }

    // Connect Database
    public Connection connect() {
        if (connection == null) {
            try {
                Class.forName(DATABASE_DRIVER);
                connection = DriverManager.getConnection(DATABASE_URL, getProperties());
            } catch (ClassNotFoundException | SQLException e) {
                e.printStackTrace();
            }
        }
        return connection;
    }

    // Disconnect Database
    public void disconnect() {
        if (connection != null) {
            try {
                connection.close();
                connection = null;
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    PreparedStatement prepareStatement(String insert_into_userusername_pass_mail_VALUES) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

}

感谢所有尝试提供帮助的人。

我在使用getConnection（）时遇到问题

2 个答案: