# 示例insert into db1.t1(id,name) values(1,'egon1'),(2,'egon2'),(3,'egon3');insert into db1.t1 values(1,'egon1'),(2,'egon2'),(3,'egon3');

# 示例：
    UPDATE mysql.user SET password=password(‘123’) where user=’root’ and host=’localhost’;

# 示例：
    DELETE FROM mysql.user WHERE password=’’;

# 本地账号
# mysql -uegon1 -p123
create user 'egon1'@'localhost' identified by '123'; # 远程帐号
# mysql -uegon2 -p123 -h 服务端ip
create user 'egon2'@'192.168.31.10' identified by '123';   # 192.168.31.10 固定ip可以登录# mysql -uegon3 -p123 -h 服务端ip
create user 'egon3'@'192.168.31.%' identified by '123';     # 192.168.31网段# mysql -uegon3 -p123 -h 服务端ip
create user 'egon3'@'%' identified by '123';    # 任何网段

#授权：
    对文件夹，对文件，对文件某一字段的权限
# 查看帮助：
    help grant
# 常用权限有：
    select,update,alter,deleteall可以代表除了grant之外的所有权限#删除权限
revoke select on db1.* to 'alex'@'%';

flush privileges;   # 刷新

#针对所有库的授权:*.*
grant all on *.* to 'redhat'@'localhost';
#只在mysql.user表中可以查到egon1用户的select权限被设置为Y
select * from mysql.user\G;
revoke all on *.* from 'redhat'@'localhost';#针对某一数据库：db1.*
grant select on db1.* to 'redhat'@'localhost';
#只在mysql.db表中可以查到redhat用户的select权限被设置为Y
select * from mysql.db\G
revoke select on db1.* from 'redhat'@'localhost';#针对某一个表：db1.t1
grant select on db1.t1 to 'redhat'@'localhost';
#只在tables_priv表中可以查到redhat用户的select权限
select * from mysql.tables_priv where user='redhat'\G
revoke select on db1.t1 from 'redhat'@'localhost';#针对某一个字段：
grant select(id),update(name) on db1.t1 to 'redhat'@'localhost';
select * from mysql.columns_priv\G;
revoke select on db1.t1 from 'redhat'@'localhost';
revoke update on db1.t1 from 'redhat'@'localhost';