jdbc 操作步骤

简介

RT

步骤

1. 加载驱动
2. 链接数据库 DriverManager
3. 获取执行sql的对象
4. 获得返回的结果集
5. 释放连接

code

package com.kuang.lesson01;

import java.sql.*;

/**
 * Created by lee on 2021/4/22.
 */
public class JdbcFirstDemo {
    public static void main(String[] args) throws SQLException, ClassNotFoundException {
        // 加载驱动
        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/jdbcstudy?useUnicode=true&characterEncoding=utf8&useSSL=true";
        String username = "root";
        String password = "123456";

        Connection connection = DriverManager.getConnection(url, username, password);
        // 执行sql对象
        Statement statement = connection.createStatement();
        String sql = "SELECT * FROM users";

        ResultSet resultSet = statement.executeQuery(sql);
        while(resultSet.next()) {
            System.out.println("id=" + resultSet.getObject("id"));
            System.out.println("name=" + resultSet.getObject("NAME"));
            System.out.println("PASSWORD=" + resultSet.getObject("PASSWORD"));
            System.out.println("email=" + resultSet.getObject("email"));
            System.out.println("birth=" + resultSet.getObject("birthday"));
        }

        resultSet.close();
        statement.close();
        connection.close();
    }
}