Mysql数据库的基本操作

1.创建数据库

mysql> create database zoo;

Query OK, 1 row affected (0.00 sec)

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| foo                |

| mysql              |

| test               |

| zoo                |

+--------------------+

5 rows in set (0.00 sec)

2.使用数据库

mysql> use zoo;

Database changed

mysql> drop database zoo;

Query OK, 0 rows affected (0.03 sec)

3.显示所有数据库

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| foo                |

| mysql              |

| test               |

+--------------------+

4 rows in set (0.00 sec)

4.查看默认的存储引擎（两种方法）

方法一：

mysql> show engines;

ERROR 2006 (HY000): MySQL server has gone away

No connection. Trying to reconnect...

Connection id:    4

Current database: *** NONE ***

+------------+---------+------------------------------------------------------------+--------------+------+------------+

| Engine     | Support | Comment                                                    | Transactions | XA   | Savepoints |

+------------+---------+------------------------------------------------------------+--------------+------+------------+

| MRG_MYISAM | YES     | Collection of identical MyISAM tables                      | NO           | NO   | NO         |

| CSV        | YES     | CSV storage engine                                         | NO           | NO   | NO         |

| MyISAM     | DEFAULT | Default engine as of MySQL 3.23 with great performance     | NO           | NO   | NO         |

| InnoDB     | YES     | Supports transactions, row-level locking, and foreign keys | YES          | YES  | YES        |

| MEMORY     | YES     | Hash based, stored in memory, useful for temporary tables  | NO           | NO   | NO         |

+------------+---------+------------------------------------------------------------+--------------+------+------------+

5 rows in set (0.02 sec)

方法二：

mysql> show variables like 'storage_engine';

+----------------+--------+

| Variable_name  | Value  |

+----------------+--------+

| storage_engine | MyISAM |

+----------------+--------+

1 row in set (0.00 sec)