2.数据库的基本操作<针对于库层面的操作>

1.查看已有数据库：

MySQL [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| db_test            |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.04 sec)

2.创建数据库：

MySQL [(none)]> create database database_name;
Query OK, 1 row affected (0.04 sec)

3.数据库创建完后可以使用show create database 申明查看数据库的定义：

MySQL [(none)]> show create database database_name\G;
+---------------+------------------------------------------------------------------------+
| Database      | Create Database                                                        |
+---------------+------------------------------------------------------------------------+
| database_name | CREATE DATABASE `database_name` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+---------------+------------------------------------------------------------------------+
1 row in set (0.04 sec)

　　

4.删除数据库：

MySQL [(none)]> drop database database_name;
Query OK, 0 rows affected (0.09 sec)

　

5.查看MySQL存储引擎：

MySQL [(none)]> show engines;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine             | Support | Comment                                                        | Transactions | XA   | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| InnoDB             | DEFAULT | Supports transactions, row-level locking, and foreign keys     | YES          | YES  | YES        |
| CSV                | YES     | CSV storage engine                                             | NO           | NO   | NO         |
| MRG_MYISAM         | YES     | Collection of identical MyISAM tables                          | NO           | NO   | NO         |
| BLACKHOLE          | YES     | /dev/null storage engine (anything you write to it disappears) | NO           | NO   | NO         |
| PERFORMANCE_SCHEMA | YES     | Performance Schema                                             | NO           | NO   | NO         |
| MyISAM             | YES     | MyISAM storage engine                                          | NO           | NO   | NO         |
| ARCHIVE            | YES     | Archive storage engine                                         | NO           | NO   | NO         |
| MEMORY             | YES     | Hash based, stored in memory, useful for temporary tables      | NO           | NO   | NO         |
| FEDERATED          | NO      | Federated MySQL storage engine                                 | NULL         | NULL | NULL       |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
9 rows in set (0.04 sec)

　　

6.MySQL库表授权：

MySQL 赋予用户权限命令的简单格式可概括为：　grant  [权限]  on  [数据库对象]  to  [用户]  <  exp: grant select, insert, update, delete  on  testdb.*  to  common_user@'%'  >
具体可参见文档：