使用ResultSet返回上次生成的密钥

import java.sql.*;

public class Example {
    public static void main(String[] args) {
        try {
            // 连接数据库
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
            
            // 执行插入语句
            String sql = "INSERT INTO mytable (name, age) VALUES ('John Doe', 25)";
            PreparedStatement statement = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
            statement.executeUpdate();
            
            // 获取生成的密钥
            ResultSet generatedKeys = statement.getGeneratedKeys();
            if (generatedKeys.next()) {
                int key = generatedKeys.getInt(1);
                System.out.println("Generated key: " + key);
            }
            
            // 关闭连接
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}