将参数传递给mysql连接字符串

import mysql.connector

# 定义连接参数
config = {
  'host': 'localhost',
  'port': 3306,
  'user': 'username',
  'password': 'password',
  'database': 'database_name'
}

# 建立数据库连接
cnx = mysql.connector.connect(**config)

# 执行数据库操作...

# 关闭数据库连接
cnx.close()

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

public class Main {
    public static void main(String[] args) {
        // 定义连接参数
        String url = "jdbc:mysql://localhost:3306/database_name";
        String username = "username";
        String password = "password";

        // 建立数据库连接
        try (Connection conn = DriverManager.getConnection(url, username, password)) {
            // 执行数据库操作...

        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// 建立数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 执行数据库操作...

// 关闭数据库连接
$conn->close();
?>