eclipse连接mysql数据库语句

import java.sql.*;

public class MySQLConnector {
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try {
            // 注册 JDBC 驱动
            Class.forName("com.mysql.jdbc.Driver");

            // 打开链接
            System.out.println("连接数据库...");
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 执行查询
            System.out.println("实例化Statement对象...");
            stmt = conn.createStatement();
            String sql = "SELECT id, name, age FROM users";
            ResultSet rs = stmt.executeQuery(sql);

            // 处理结果集
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                int age = rs.getInt("age");

                System.out.println("ID: " + id);
                System.out.println("Name: " + name);
                System.out.println("Age: " + age);
            }

            // 清理环境
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException se) {
            // 处理 JDBC 错误
            se.printStackTrace();
        } catch (Exception e) {
            // 处理 Class.forName 错误
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (stmt != null)
                    stmt.close();
            } catch (SQLException se2) {
            } // 什么都不做
            try {
                if (conn != null)
                    conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            }
        }
        System.out.println("Goodbye!");
    }
}