如果if-statement为true，如何关闭mysql连接？

import mysql.connector

# 创建连接
cnx = mysql.connector.connect(user='username', password='password', host='localhost', database='database_name')

# 执行if-statement
if if_statement:
    # 关闭连接
    cnx.close()

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

// 创建连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/database_name", "username", "password");

// 执行if-statement
if (if_statement) {
    // 关闭连接
    conn.close();
}

const mysql = require('mysql');

// 创建连接
const connection = mysql.createConnection({
  host: 'localhost',
  user: 'username',
  password: 'password',
  database: 'database_name'
});

// 执行if-statement
if (if_statement) {
    // 关闭连接
    connection.end();
}