java获取mysql主键id

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

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

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "INSERT INTO mytable (name, age) VALUES (?, ?)";
            try (PreparedStatement pstmt = conn.prepareStatement(sql, PreparedStatement.RETURN_GENERATED_KEYS)) {
                pstmt.setString(1, "John Doe");
                pstmt.setInt(2, 30);
                int affectedRows = pstmt.executeUpdate();

                if (affectedRows > 0) {
                    try (ResultSet rs = pstmt.getGeneratedKeys()) {
                        if (rs.next()) {
                            long id = rs.getLong(1);
                            System.out.println("Inserted record ID: " + id);
                        }
                    }
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}