在Java中插入SQL后访问自动增量标识字段

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

public class Main {
    public static void main(String[] args) {
        try {
            // 加载数据库驱动
            Class.forName("com.mysql.jdbc.Driver");

            // 建立数据库连接
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "password");

            // 创建插入语句
            String sql = "INSERT INTO users (name, age) VALUES (?, ?)";
            PreparedStatement pstmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);

            // 设置参数
            pstmt.setString(1, "John");
            pstmt.setInt(2, 25);

            // 执行插入语句
            int affectedRows = pstmt.executeUpdate();

            // 获取自动增量主键值
            ResultSet generatedKeys = pstmt.getGeneratedKeys();
            if (generatedKeys.next()) {
                int id = generatedKeys.getInt(1);
                System.out.println("自动增量主键值为：" + id);
            }

            // 关闭资源
            generatedKeys.close();
            pstmt.close();
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}