jdbc 查询数据 230222

import java.sql.*;

public class Test {
    public static void main(String[] args) throws SQLException, ClassNotFoundException {
        // 加载驱动类
        Class.forName("com.mysql.jdbc.Driver");

        // 获取信息
        // 连接字符串 连接失败会报错
        String url = "jdbc:mysql://localhost:3306/heighschool";
        // 用户名
        String user = "root";
        // 密码
        String password = "root123";
        // 连接对象获取
        Connection connection = DriverManager.getConnection(url, user, password);

        // 获取执行者
        Statement statement = connection.createStatement();

        // 查询语句
        String sql = "select * from student";

        // 查询，得结果集
        ResultSet resultSet = statement.executeQuery(sql);

        // 遍历结果集
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            int age = resultSet.getInt("age");
            String msg = String.format("编号：%s,姓名:%s，年龄%s", id, name, age);
            System.out.println(msg);
        }

    }
}