哪个网站微博做的最好,怎么将网站做成小程序,中国城乡建设部网站首页,宁波seo博客系统#xff1a;ubuntu17.04数据库主要分文档型和服务型两类#xff1a;文档型#xff1a;如sqlite3 (17.04自带/usr/bin/sqlite3)就是一个文件#xff0c;应用在移动端如手机#xff0c;pad#xff0c;家电等服务型#xff1a;如mysql有服务端(存储数据)和客户端mysql数…系统ubuntu17.04数据库主要分文档型和服务型两类文档型如sqlite3 (17.04自带/usr/bin/sqlite3)就是一个文件应用在移动端如手机pad家电等服务型如mysql有服务端(存储数据)和客户端mysql数据库是关系型数据库采用E-R模型即实体-联系(或关系)模型安装sudo apt install mysql-server需要设置密码xxxsudo apt install mysql-clientsudo apt install libmysqlclient-devlyblyb:~$ sudo netstat -tap |grep mysqltcp0 0 localhost:mysql *:* LISTEN 5167/mysqld成功安装登录ll:~$ mysql -uroot -pxxxmysql: [Warning] Using a password on the command lineinterfacecan be insecure.Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection idis 5Server version:5.7.20-0ubuntu0.16.04.1(Ubuntu)Copyright (c)2000, 2017, Oracle and/or its affiliates. All rights reserved.Oracleis a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Typehelp; or \h for help. Type \cto clear the current input statement.mysqlshow databases;　　#初始有四个数据库--------------------| Database |--------------------| information_schema || mysql || performance_schema || sys |--------------------4 rows in set (0.16sec)创建用户并授权mysql create user l% identified by 123;Query OK,0 rows affected (0.09sec)mysql select user,host fromuser;--------------------------| user | host |--------------------------| l | % || mysql.session | localhost || mysql.sys | localhost || root | localhost |--------------------------4 rows in set (0.00sec)mysql grant select on study.* to l%;desc  user　　#显示其中user表的结构如下----------------------------------------------------------------------------------------------------| Field | Type | Null | Key | Default | Extra |----------------------------------------------------------------------------------------------------| Host | char(60) | NO | PRI | | || User | char(32) | NO | PRI | | || Select_priv | enum(N,Y) | NO | | N | || Insert_priv | enum(N,Y) | NO | | N | || Update_priv | enum(N,Y) | NO | | N | || Delete_priv | enum(N,Y) | NO | | N | || Create_priv | enum(N,Y) | NO | | N | || Drop_priv | enum(N,Y) | NO | | N | || Reload_priv | enum(N,Y) | NO | | N | || Shutdown_priv | enum(N,Y) | NO | | N | || max_user_connections | int(11) unsigned | NO | | 0 | || plugin | char(64) | NO | | mysql_native_password | || authentication_string | text | YES | | NULL | || password_expired | enum(N,Y) | NO | | N | || password_last_changed | timestamp | YES | | NULL | || password_lifetime | smallint(5) unsigned | YES | | NULL | || account_locked | enum(N,Y) | NO | | N | |----------------------------------------------------------------------------------------------------注字段创建要有数据类型长度Null是否为空NO表示不能为空PRI表示主键一般是一个本表前两个是联合主键select  字段  from  表exit　　#从mysql数据库退出ps -ef |grep mysql　　#在命令行从所有进程筛选mysql