连接远程MySQL
mysql -h 110.110.110.110 -u root -p
链接本地MySQL
mysql -u root -p
查看数据库
show databases;
结果
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| php |
| sys |
+--------------------+
5 rows in set (0.00 sec)
选择数据库
use mysql;
查看数据表
show tables;
创建数据库
create database school_info;
删除数据库
drop database school_info;
创建表
CREATE TABLE `school_info`.`school` (
`id` bigint(11) UNSIGNED NOT NULL AUTO_INCREMENT,
`name` varchar(200) NULL COMMENT ‘学校名称‘,
`create_at` bigint(11) NULL,
`update_at` bigint(11) NULL,
`status` tinyint(4) NULL DEFAULT 0 COMMENT ‘状态‘,
PRIMARY KEY (`id`)
) ENGINE = InnoDB COMMENT = ‘学校信息表‘;
查看数据表的结构
desc school;
结果
+-----------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+---------------------+------+-----+---------+----------------+
| id | bigint(11) unsigned | NO | PRI | NULL | auto_increment |
| name | varchar(200) | YES | | NULL | |
| create_at | bigint(11) | YES | | NULL | |
| update_at | bigint(11) | YES | | NULL | |
| status | tinyint(4) | YES | | 0 | |
+-----------+---------------------+------+-----+---------+----------------+
5 rows in set (0.00 sec)
添加表数据 - 插入记录
insert into school values(2,"学校3",1625568499,1625568499,1);
或
insert into school(name,create_at,update_at,status) values("学校4",1625568499,1625568499,1);
查看数据表的内容
select * from school;
结果
+----+---------+------------+------------+--------+
| id | name | create_at | update_at | status |
+----+---------+------------+------------+--------+
| 1 | 学校1 | 1625568499 | 1625568499 | 1 |
| 2 | 学校2 | 1625568499 | 1625568499 | 1 |
| 3 | 学校3 | 1625568499 | 1625568499 | 1 |
| 4 | 学校4 | 1625568499 | 1625568499 | 1 |
+----+---------+------------+------------+--------+
4 rows in set (0.00 sec)
添加表字段
alter table school add `adress` varchar(200) NULL COMMENT ‘地址‘ after `name`;
删除列
alter table school drop `adress`;
修改表记录
update school set `name`=‘学校名称1‘ where `id`=1;
删除表记录
delete from school where `id`=4;
清空表记录
truncate table school;
删除数据表
drop table if exists school;