1、每创建一个数据库，在mysql的data文件夹里会创建一个目录，数据库名就是目录名
mysql> create database phone_num; Query OK, 1 row affected (0.00 sec) mysql> show databases; -------------------- | Database | -------------------- | information_schema | | mysql | | performance_schema | | phone_num | | sys | -------------------- 5 rows in set (0.00 sec)
查看data文件，有phone_num这个文件夹
cd /usr/local/mysql/data
[[email protected] data]# ls
auto.cnf ib_buffer_pool ibdata1 ib_logfile0 ib_logfile1 ibtmp1 iz2zedr8770rctry7tq8t7z.pid mysql performance_schema phone_num sys
2、创建表
mysql> use phone_num Database changed mysql> create table phone_num_data -> (case_id INT(4) PRIMARY KEY, -> phone_num INT(11) ); Query OK, 0 rows affected (0.01 sec) mysql> show tables; --------------------- | Tables_in_phone_num | --------------------- | phone_num_data | --------------------- 1 row in set (0.00 sec)
3、查看表结构
mysql> desc phone_num_data ; ----------- --------- ------ ----- --------- ------- | Field | Type | Null | Key | Default | Extra | ----------- --------- ------ ----- --------- ------- | case_id | int(4) | NO | PRI | NULL | | | phone_num | int(11) | YES | | NULL | | ----------- --------- ------ ----- --------- ------- 2 rows in set (0.00 sec)
4、想更改数据库名，从1中可以知道，直接改文件名就可以啦
[[email protected] data]# ls
auto.cnf ib_buffer_pool ibdata1 ib_logfile0 ib_logfile1 ibtmp1 iz2zedr8770rctry7tq8t7z.pid mysql performance_schema phone_num sys
[[email protected] data]# mv phone_num test_cases
[[email protected] data]# ls
auto.cnf ib_buffer_pool ibdata1 ib_logfile0 ib_logfile1 ibtmp1 iz2zedr8770rctry7tq8t7z.pid mysql performance_schema sys test_cases
改完啦，查询看看吧
mysql> show databases; -------------------- | Database | -------------------- | information_schema | | mysql | | performance_schema | | sys | | test_cases | -------------------- 5 rows in set (0.00 sec)
不要改了，改完就报错
mysql> desc phone_num_data; ERROR 1146 (42S02): Table ‘test_cases.phone_num_data‘ doesn‘t exist
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