目录 刷题记录:[FBCTF2019]Products Manager 一.知识点 1.基于约束的SQL注入攻击 刷题记录:[FBCTF2019]Products Manager 题目复现链接:https://buuoj.cn/challenges 参考链接:基于约束的SQL攻击 一.知识点 1.基于约束的SQL注入攻击 知道有这个东西就做出来了…

基于约束的SQL攻击 一.知识点: 1.数据库字符串比较: 在数据库对字符串进行比较时,如果两个字符串的长度不一样,则会将较短的字符串末尾填充空格,使两个字符串的长度一致,比如,字符串A:[String]和字符串B:[String2]进行比较时,由于String2比String多了一个字符串,这时MySQL会将字符串A填充为[String ],即在原来字符串后面加了一个空格,使两个字符串长度一致. 如下两条查询语句: select * from users where username='Dum…

A. Straight «A» time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…

Summer holidays! Someone is going on trips, someone is visiting grandparents, but someone is trying to get a part-time job. This summer Noora decided that she wants to earn some money, and took a job in a shop as an assistant. Shop, where Noora is wo…

A. Straight «A» 题面 Noora is a student of one famous high school. It's her final year in school - she is going to study in university next year. However, she has to get an «A» graduation certificate in order to apply to a prestigious one. In school, w…

A. Straight «A» time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…

B. Summer sell-off time limit per test   1 second memory limit per test   256 megabytes   Summer holidays! Someone is going on trips, someone is visiting grandparents, but someone is trying to get a part-time job. This summer Noora decided that she w…

B. Summer sell-off   time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Summer holidays! Someone is going on trips, someone is visiting grandparents, but someone is trying to get a part-time j…

Ajax技术的核心是XMLHttpRequest对象(简称XHR),可以通过使用XHR对象获取到服务器的数据,然后再通过DOM将数据插入到页面中呈现.虽然名字中包含XML,但Ajax通讯与数据格式无关,所以我们的数据格式可以是XML或JSON等格式. XMLHttpRequest对象用于在后台与服务器交换数据,具体作用如下: 在不重新加载页面的情况下更新网页 在页面已加载后从服务器请求数据 在页面已加载后从服务器接收数据 在后台向服务器发送数据 本文目录: XMLHttpRequest的用法 A…

A. Straight «A» time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…