mysql学习笔记
2016-10-30 22:14
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/*
转载请注明出处,ID:珍惜少年时
*/
开启mysql服务:net start mysql
关闭mysql服务:net stop mysql
姑且如此,如有漏缺望告知弥补。后续也会增减等操作。mysql开启外链:GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root密码' WITH GRANT OPTION;
MYSQL注入当中常用函数
转载请注明出处,ID:珍惜少年时
*/
开启mysql服务:net start mysql
关闭mysql服务:net stop mysql
姑且如此,如有漏缺望告知弥补。后续也会增减等操作。mysql开启外链:GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root密码' WITH GRANT OPTION;
mysql -h127.0.0.1 -P 3306 -uroot -p123456 mysql>create datatabase test; #创建一个test数据库 mysql>use test; #使用test这个数据库 mysql>drop database test; #删除数据库 mysql>show databases; #显示所有的数据库 修改数据库的字符集 mysql>use mydb mysql>alter database mydb character set utf-8; 创建数据库指定数据库的字符集 mysql>create database mydb character set utf-8; 00x1[表创建实例]------------------------------------------------- mysql>create table admin( #创建一个admin表 mysql>id int, #创建字段id,数据类型为int型 mysql>name varchar(255), #创建字段name,数据类型是varchar mysql>password varchar(255) #创建字段password,数据类型为varchar mysql>); #更多数据类型可参考:http://www.cnblogs.com/xishaonian/p/6009605.html ----------------------------------------------------------------------- mysql>desc test; #查询表结构 mysql>drop table test; #删除test表常用
[表明重明名,rename] mysql>rename table auto to price; [指定删除数据,delect]---------------------------------------------------- mysql>delect from book where id="1"; [选定字段查询数据]-------------------------------------------------------- mysql>select auto,prince from book; [修改字段查询数据,alert]--------------------------------------------------- mysql>alert table admin change ust user varchar(255); alter table 表名 change 现有字段名称 修改后字段名称 数据类型 [查询结果排序,desc]---------------------------------------------------- mysql>select id,name,price from book order by id desc; #倒序排列,升序是asc [限定查询,limit]----------------------------------------------------- mysql>select id,name,price from limit 0,5; [别名,as]----------------------------------------------------- select bookname as '图书室' , suto as '作者' from book; [联合查询,union]------------------------------------------------------ mysql>select bookname from book union select bookprice from book;
[去重复、distinct]------------------------------------------------------
msyql>select distinct test from hello; #去除hello表下的test列重复的。
[between,音译为:之间]------------------------------------------------------ mysql>select * from admin where between a and b; #即a到b之间的数据,记得a和b须是数字。插入[insert]
mysql> select * from admin; +------+-----------+------------+ | id | username | password | +------+-----------+------------+ | 1 | admin | admin | | 3 | admin888 | 123456 | | 2 | admin123 | admdin123 | | 4 | admin123 | admdin123 | | 5 | admin1231 | a1dmdin123 | +------+-----------+------------+ 5 rows in set (0.00 sec) mysql> insert into admin(id,username,password) values(6,"guanli","qpiha"); Query OK, 1 row affected (0.06 sec)更新、update[update table set 列名=新值 where 条件]
mysql> select * from admin; +------+-----------+------------+ | id | username | password | +------+-----------+------------+ | 1 | admin | admin | | 2 | admin888 | 123456 | | 2 | admin123 | admdin123 | | 4 | admin123 | admdin123 | | 5 | admin1231 | a1dmdin123 | +------+-----------+------------+ 5 rows in set (0.00 sec) mysql> update admin set id=3 where username='admin888' and password='123456'; Query OK, 1 row affected (0.08 sec)模糊查询、link
mysql>select bookname,auto,username from book where bookname like "%php%";
MYSQL注入当中常用函数
@@version() @@datadir() load_file() current_user() #当前用户 if(test,t,f) #如果test为真就返回t否则返回f。 mid(str,start,length) 函数用于得到一个字符串的一部分
mysql> select username from admin;
+----------+
| username |
+----------+
| admin |
| liuneng |
+----------+
2 rows in set (0.00 sec)mysql> select mid(username,2,4) from admin;
+-------------------+
| mid(username,2,4) |
+-------------------+
| dmin |
| iune |
+-------------------+
ord()返回第一个字符的ascii值 ascii() 返回字符的ASCII码值 limit(a,b) 限制 order by 查询方式 substr(string,start,length) left(string,length) rand():取0到1之间的任意数
mysql> select rand(); +--------------------+ | rand() | +--------------------+ | 0.9518547215981918 | +--------------------+ 1 row in set (0.00 sec)
floor():取整函数 count():计算有多少个列,select count(*) from admin; 返回的会是一个数字。那个数字就是admin表下有几个列。
mysql> select count(*) from admin; +----------+ | count(*) | +----------+ | 10 | +----------+ 1 row in set (0.00 sec)
group by clause 分组函数待更新....
ifnull(a,b)如果a为null就执行b。否则执行a
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