连接mysql的语句怎么写

import mysql.connector

try:
    connection = mysql.connector.connect(
        host='localhost',
        user='your_username',
        password='your_password',
        database='your_database'
    )
    print("Connection successful")
except mysql.connector.Error as err:
    print(f"Error: '{err}'")
finally:
    if connection.is_connected():
        connection.close()

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

public class MySQLConnectionExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/your_database";
        String user = "your_username";
        String password = "your_password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            System.out.println("Connection successful");
        } catch (SQLException e) {
            System.out.println("Error: " + e.getMessage());
        }
    }
}

const mysql = require('mysql');

const connection = mysql.createConnection({
    host: 'localhost',
    user: 'your_username',
    password: 'your_password',
    database: 'your_database'
});

connection.connect((err) => {
    if (err) throw err;
    console.log('Connection successful');
});

connection.end();

using MySql.Data.MySqlClient;
using System;

class Program
{
    static void Main()
    {
        string connectionString = "Server=localhost;Database=your_database;Uid=your_username;Pwd=your_password;";
        try
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                connection.Open();
                Console.WriteLine("Connection successful");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error: " + ex.Message);
        }
    }
}