-- 查看mysql的当前登陆用户
select user();

-- 列出数据库
show databases;

-- 使用数据库
use mysql;
describe mysql.user;
select host, user from user;
select host,user,password from mysql.user;
-- 创建一个数据库
CREATE DATABASE hive;
-- 列出表
show tables;
-- 显示MySQL所有用户:
select host,user,password from user;
-- 添加 MySQL 用户(user name:user1,password:sql):
grant all on . to ranger@'%' identified by 'zdh1234' with grant option;
-- 删除 MySQL 用户：
delete from user where user='user1';
select host,user,password from user where user = '';
delete from user where user = '';
flush privileges;

select * from user;
-- 删除mysql.user表中出现user为空的记录
delete from user where user is NULL;
update user set user='root' where host='localhost';

-- 修改密码，需要重启mysql
update user set password=password("zdh1234") where user="root" and host='localhost';

grant all on . to root@'localhost' identified by 'zdh1234' with grant option;
flush privilege;

insert into table(Host,User,Password,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv,Reload_priv,Shutdown_priv,Process_priv,File_priv,Grant_priv,References_priv,Index_priv,Alter_priv,Show_db_priv,Super_priv,Create_tmp_table_priv,Lock_tables_priv,Execute_priv,Repl_slave_priv,Repl_client_priv,Create_view_priv,Show_view_priv,Create_routine_priv,Alter_routine_priv,Create_user_priv,Event_priv,Trigger_priv,Create_tablespace_priv,ssl_type,ssl_cipher,x509_issuer,x509_subject,max_questions,max_updates,max_connections,max_user_connections,plugin,authentication_string) values ('%','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','',null,null,null,0,0,0,0,'',null);

SET GLOBAL log_bin_trust_function_creators = 1;
SELECT @@global.log_bin_trust_function_creators;

-- 查看服务器变量have_ssl，是否支持SSL
SHOW VARIABLES LIKE '%ssl%';
-- 如果为yes，表示服务端已经开启SSL
-- 查看服务ssl等状态
SHOW STATUS LIKE 'Ssl_cipher';
SHOW STATUS LIKE '%ssl%';