服务器连接数据库的语句

import java.sql.*;

public class Main {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "mypassword";

        try {
            Connection connection = DriverManager.getConnection(url, username, password);
            System.out.println("成功连接到MySQL数据库");
            // 其他数据库操作...
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

import sqlite3

conn = sqlite3.connect('mydatabase.db')
print("成功连接到SQLite数据库")

# 其他数据库操作...

conn.close()

<?php
$host = "localhost";
$port = "5432";
$dbname = "mydatabase";
$user = "myuser";
$password = "mypassword";

try {
    $dsn = "pgsql:host=$host;port=$port;dbname=$dbname;user=$user;password=$password";
    $connection = new PDO($dsn);
    echo "成功连接到PostgreSQL数据库";
    // 其他数据库操作...
    $connection = null;
} catch (PDOException $e) {
    echo "连接到数据库失败: " . $e->getMessage();
}
?>