MySQL创建数据库与表-编程知识

MySQL创建数据库与表

要求：

1.在本机安装数据库

2.创建一个数据库db_classes

3.创建一行表db_hero

4.将四大名著中的常见人物插入这个英雄表

要求：

过程：

结果：

命令总结：

过程：

1.安装数据库

http://t.csdnimg.cn/8TxVD

2.建数据库

mysql> create database db_classes-> default charset = utf8mb4;
Query OK, 1 row affected (0.03 sec)mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| db_classes         |
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

3.建表

mysql> use db_classes;
Database changed
mysql> show tables;
Empty set (0.01 sec)mysql> create table db_hero(-> id int not null,-> name varchar(100) not null,-> nickname varchar(100),-> age int,-> gender varchar(2),-> address varchar(100),-> weapon varchar(100),-> world varchar(100),-> types varchar(100)-> );
Query OK, 0 rows affected (0.03 sec)mysql> desc db_hero;
+----------+--------------+------+-----+---------+-------+
| Field    | Type         | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| id       | int          | NO   |     | NULL    |       |
| name     | varchar(100) | NO   |     | NULL    |       |
| nickname | varchar(100) | YES  |     | NULL    |       |
| age      | int          | YES  |     | NULL    |       |
| gender   | varchar(2)   | YES  |     | NULL    |       |
| address  | varchar(100) | YES  |     | NULL    |       |
| weapon   | varchar(100) | YES  |     | NULL    |       |
| world    | varchar(100) | YES  |     | NULL    |       |
| types    | varchar(100) | YES  |     | NULL    |       |
+----------+--------------+------+-----+---------+-------+
9 rows in set (0.00 sec)

4.插入数据

mysql> insert into db_hero values(1,"孙悟空","齐天大圣",800,"男","花果山","如意金箍棒","西游记","妖族");
Query OK, 1 row affected (0.01 sec)mysql> insert into db_hero values(2,"林黛玉","林妹妹",20,"女","贾府","倒拔垂杨柳","红楼梦","人类");
Query OK, 1 row affected (0.01 sec)mysql> insert into db_hero values(3,"李逵","黑旋风",30,"男","沂州","两柄板斧","水浒传","人类");
Query OK, 1 row affected (0.00 sec)mysql> insert into db_hero values(4,"赵云","常山赵子龙",27,"男","常山","涯角枪","三国演义","人类");
Query OK, 1 row affected (0.00 sec)mysql> insert into db_hero values(5,"白龙马","小玉龙",3,"雄","东土大唐","","西游记","动物");
Query OK, 1 row affected (0.00 sec)mysql> insert into db_hero values(6,"紫霞仙子","盘丝大仙",500,"女","盘丝洞","紫青宝剑","西游计","神仙");
Query OK, 1 row affected (0.00 sec)

结果：

mysql> show tables;
+----------------------+
| Tables_in_db_classes |
+----------------------+
| db_hero              |
+----------------------+
1 row in set (0.00 sec)mysql> select * from db_hero;
+----+--------------+-----------------+------+--------+--------------+-----------------+--------------+--------+
| id | name         | nickname        | age  | gender | address      | weapon          | world        | types  |
+----+--------------+-----------------+------+--------+--------------+-----------------+--------------+--------+
|  1 | 孙悟空       | 齐天大圣        |  800 | 男     | 花果山       | 如意金箍棒      | 西游记       | 妖族   |
|  2 | 林黛玉       | 林妹妹          |   20 | 女     | 贾府         | 倒拔垂杨柳      | 红楼梦       | 人类   |
|  3 | 李逵         | 黑旋风          |   30 | 男     | 沂州         | 两柄板斧        | 水浒传       | 人类   |
|  4 | 赵云         | 常山赵子龙      |   27 | 男     | 常山         | 涯角枪          | 三国演义     | 人类   |
|  5 | 白龙马       | 小玉龙          |    3 | 雄     | 东土大唐     |                 | 西游记       | 动物   |
|  6 | 紫霞仙子     | 盘丝大仙        |  500 | 女     | 盘丝洞       | 紫青宝剑        | 西游计       | 神仙   |
+----+--------------+-----------------+------+--------+--------------+-----------------+--------------+--------+
6 rows in set (0.00 sec)

命令总结：

查看数据库 show databases;

创建数据库

create database 数据库名称 [default charset = utf8mb4]；同时指定编码，否则参数默认

使用数据库 use 已存在的数据库名称；

删除数据库 drop database 数据库名称;

在某个数据库中执行表操作

查看所有表格 show tables;

创建表格 create table 表名称（
字段1名称类型 [约束条件,]
字段2名称类型 [约束条件,]
……
)；

查看表结构 describe 已存在的表;

插入数据

insert into 表名 values(xx, "xxx", xx, "xx");根据不同字段类型按顺序一一对应

查看表所有内容 select * from 表名；

删除表 drop table 表名；