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MySQL基本操作
一、登录数据库
# mysql -u root -p -P 3306 -h localhost -S /data/3306/mysql.sock
选项: -u root #指定登录用户
-p 123456 #用密码登录,不建议在命令行打密码,如果非要这样用,记得#history –c 清除历史记录
-P 端口号 #在指定端口号登录
-h 主机名 #登录的主机
-S 套接字文件位置 #指定登录的套接字文件位置
下面操作的数据库为MySQL多实例
二、创建数据库用户
1、mysql> create user ‘wdd‘@‘192.168.131.%‘ identified by ‘123456‘;
2、 mysql> show grants; #查看当前用户的授权
3、mysql> show grants for ‘wdd‘@‘192.168.131.%‘;#查看指定用户的授权
三、修改用户密码
1、# mysqladmin -uwdd -p123456 -S /data/3306/mysql.sock password ‘123‘;
2、进入MySQL登录界面
# mysql -uwdd -p123 -S /data/3306/mysql.sock
mysql> set password=password(‘123456‘); #修改自己的密码
mysql> set password for ‘wdd‘@‘192.168.131.%‘ =password(‘123456‘);
#修改指定用户的登录密码
3、修改user表,必须得具有root权限
mysql> use mysql;
mysql> select user,host,password from user; #查看用户相关信息
mysql> update user set password=password(‘123‘) where host=‘localhost‘ and user=‘wdd‘;
四、查看数据库和数据表
1、mysql> show databases;
2、mysql> use mysql;
mysql> show tables ;
五、创建数据库
mysql> create database wdd;
六、创建数据表
create table 表名 (字段1 值,字段2 值 ……);
1、创建表books,设置序号、书名、作者、价格、发布日期、说明,第几集
mysql> use wdd;
mysql> create table books(
-> id int(10) unsigned not null auto_increment,
-> author char(20),
-> bookname char(50) not null,
-> price int(20) not null,
-> time year,
-> description char(100),
-> pagenum int(10),
-> primary key(id));
mysql> describe books;
2、不指定字段名称,插入第一集的书籍。
mysql> insert into books values (1,"wdd","python",50,2015,"this is a good book",20);
3、同时插入多条数据(不指定集数,自动分配) auto_increment
mysql> insert into books (author,bookname,price,time,description,pagenum) values (‘name1‘,‘php‘,50,2015,‘good book‘,40)
mysql> insert into books (author,bookname,price,time,description,pagenum) values (‘name2‘,‘ui‘,50,2015,‘good book‘,30);
mysql> insert into books (author,bookname,price,time,description,pagenum) values (‘name3‘,‘java‘,50,2015,‘good book‘,30);
mysql> insert into books (author,bookname,price,time,description,pagenum) values (‘name4‘,‘linux‘,50,2015,‘good book‘,30);
mysql> insert into books (author,bookname,price,time,description,pagenum) values (‘name5‘,‘mysql‘,50,2015,‘good book‘,40);
mysql> select * from books;
4、修改第2集到第5集的作者
mysql> update books set author=‘zhangsan‘ where id=2;
mysql> update books set author=‘lisi‘ where id=3;
mysql> update books set author=‘wangwu‘ where id=4;
mysql> update books set author=‘zhaoliu‘ where id=5;
mysql> select * from books;
5、将第三集的价格改为0
mysql> update books set price=0 where id=3;
mysql> select * from books;
6、删除价格为0的书籍
mysql> delete from books where price=0;
mysql> select * from books;
七、删除数据表
mysql> drop table books;
八、删除数据库
drop table 表名;
mysql> drop database wdd;
mysql> show databases;
九、插入数据
insert into 表名 (字段1,字段2……) values (数据1,数据2……);
CREATE TABLE person(
id INT UNSIGNED NOT NULL AUTO_INCREMENT,
name CHAR(40) NOT NULL DEFAULT ‘‘,
age INT NOT NULL DEFAULT 0,
info CHAR(50) NULL,
PRIMARY KEY (id));
mysql> desc person;
mysql> insert into person (id,name,age) values (3,‘Green‘,21);
mysql> insert into person (id,name,age,info) values (4,‘Suse‘,22,‘dancer‘);
mysql> insert into person (name,age) values (‘Mary‘,24);
mysql> insert into person (name,age,info) values (‘Willam‘,20,‘sports man‘);
mysql> insert into person (name,age) values (‘laura‘,25);????
mysql> insert into person values (8,‘zhangsan‘,23,‘handsome boy‘), (9,‘lisi‘,23,‘student‘);
mysql> insert into person values (10,‘jack‘,27,‘teacher‘),(11,‘lusi‘,20,‘boss‘),(12,‘zhaoliu‘,29,‘super man‘);
mysql> select * from person;
十、查看数据
select 字段 from 表名;
mysql> select name,age,info from person;
十一、修改数据
update 表名 set 字段1 where 字段2
mysql> update person set name=‘LiMing‘and age=15 where id=10;
mysql> update person set info=‘student‘ where id=10 or id=11 or id=12;
mysql> select * from person;
十二、删除数据
delete from 表名 where 字段
mysql> delete from person where id=10;
mysql> delete from person where id=11 or id=12;
mysql> select * from person;
十三、修改字段
CREATE TABLE person(
id INT UNSIGNED NOT NULL AUTO_INCREMENT,
name CHAR(40) NOT NULL DEFAULT ‘‘,
age INT NOT NULL DEFAULT 0,
info CHAR(50) NULL,
PRIMARY KEY (id));
mysql> alter table person rename ps;
mysql> alter table ps modify name CHAR(50) NOT NULL DEFAULT ‘‘;
mysql> alter table ps change info infomation CHAR(50) NULL;
mysql> alter table ps change infomation info CHAR(60) NULL;
mysql> alter table ps add time year;
mysql> alter table ps add nian year;
mysql> alter table ps add sex char(10) after name;
mysql> alter table ps drop nian;
mysql> alter table ps modify age int(11) not null default 0 after sex;
注:如果希望插入的字段位于行首,可以用first,比如:
mysql> alter table ps modify age int(11) not null default 0 first;
十四、授权
grant 权限 on 数据库.数据表 to ‘用户‘@‘地址‘;
1使用GRANT语句创建一个新的用户zhangsan,密码为‘grantpwd‘。用户zhangsan对所有的数据有查询、插入权限。并授于GRANT权限
mysql> grant select,insert on *.* to ‘zhangsan‘@‘192.168.131.%‘ identified by ‘grantpwd‘;
mysql> show grants for ‘zhangsan‘@‘192.168.131.%‘;
十五、取消权限
revoke 权限1,权限2 on 数据库.数据表 from ‘用户‘@‘地址‘;
1.取消zhangsan的create、drop、delete权限。
mysql> revoke create,drop,delete on *.* from ‘zhangsan‘@‘192.168.131.%‘;
十六、查看权限
mysql> SHOW GRANTS FOR ‘zhangsan‘@‘192.168.131.%‘;
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原文地址:http://www.cnblogs.com/fengyutech/p/4937409.html