一, 创建用户:
命令:CREATE USER 'username'@'host' IDENTIFIED BY 'password';
说明:username - 你将创建的用户名, host - 指定该用户在哪个主机上可以登陆,如果是本地用户可用localhost, 如果想让该用户可以从任意远程主机登陆,可以使用通配符%. password - 该用户的登陆密码,密码可以为空,如果为空则该用户可以不需要密码登陆服务器.
例子: CREATE USER 'dog'@'localhost' IDENTIFIED BY '123456';
CREATE USER 'pig'@'192.168.1.101_' IDENDIFIED BY '123456';
CREATE USER 'pig'@'%' IDENTIFIED BY '123456';
CREATE USER 'pig'@'%' IDENTIFIED BY '';
CREATE USER 'pig'@'%';
二,授权:
命令:GRANT privileges ON databasename.tablename TO 'username'@'host'
说明: privileges - 用户的操作权限,如SELECT , INSERT , UPDATE 等.如果要授予所的权限则使用ALL.;databasename - 数据库名,tablename-表名,如果要授予该用户对所有数据库和表的相应操作权限则可用*表示, 如*.*.
例子: GRANT SELECT, INSERT ON test.user TO 'pig'@'%';
GRANT ALL ON *.* TO 'pig'@'%';
注意:用以上命令授权的用户不能给其它用户授权,如果想让该用户可以授权,用以下命令:
GRANT privileges ON databasename.tablename TO 'username'@'host' WITH GRANT OPTION;
三.设置与更改用户密码
命令:SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');如果是当前登陆用户用SET PASSWORD = PASSWORD("newpassword");
例子: SET PASSWORD FOR 'pig'@'%' = PASSWORD("123456");
四.撤销用户权限
命令: REVOKE privilege ON databasename.tablename FROM 'username'@'host';
说明: privilege, databasename, tablename - 同授权部分.
例子: REVOKE SELECT ON *.* FROM 'pig'@'%';
注意: 假如你在给用户'pig'@'%'授权的时候是这样的(或类似的):GRANT SELECT ON test.user TO 'pig'@'%', 则在使用REVOKE SELECT ON *.* FROM 'pig'@'%';命令并不能撤销该用户对test数据库中user表的SELECT 操作.相反,如果授权使用的是GRANT SELECT ON *.* TO 'pig'@'%';则REVOKE SELECT ON test.user FROM 'pig'@'%';命令也不能撤销该用户对test数据库中user表的Select 权限.
具体信息可以用命令SHOW GRANTS FOR 'pig'@'%'; 查看.
五.删除用户
命令: DROP USER 'username'@'host';
六.创建表
create
table
blog_article
(
article_Id
int
unsigned
not
null
auto_increment,
article_title
varchar
(20)
not
null
unique
,
article_content longtext
not
null
,
article_date datetime
not
null
,
article_readTime
int
unsigned
not
null
default
0,
user_Name
char
(15)
not
null
,
category_Name
char
(18)
not
null
,
primary
key
(article_Id),
foreign
key
(user_Name)
references
blog_user(user_Name)
on
delete
cascade
on
update
cascade
,
foreign
key
(category_Name)
references
blog_category(category_Name)
on
delete
cascade
on
update
cascade
)engine=innodb
default
charset=utf8 auto_increment=1;
create
table
blog_article
(
article_Id
int
unsigned
not
null
auto_increment,
article_title
varchar
(20)
not
null
unique
,
article_content longtext
not
null
,
article_date datetime
not
null
,
article_readTime
int
unsigned
not
null
default
0,
user_Name
char
(15)
not
null
,
category_Name
char
(18)
not
null
,
primary
key
(article_Id),
foreign
key
(user_Name)
references
blog_user(user_Name)
on
delete
cascade
on
update
cascade
,
foreign
key
(category_Name)
references
blog_category(category_Name)
on
delete
cascade
on
update
cascade
)engine=innodb
default
charset=utf8 auto_increment=1;