mysql隨筆系列-1
MySQL數據庫管理
本人實驗所用的MySQL數據庫版本：5.5.56-MariaDB MariaDB Server 操作系統：centos7.5
1.創建數據庫
MariaDB [(none)]> create database test1;
2.查看所有數據庫
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
| test1 |
+--------------------+
5 rows in set (0.00 sec)
3.創建指定字符集數據庫
查看庫的字符集和校對規則：
MariaDB [(none)]> show character set;
+----------+-----------------------------+---------------------+--------+
| Charset | Description | Default collation | Maxlen |
+----------+-----------------------------+---------------------+--------+
| big5 | Big5 Traditional Chinese | big5_chinese_ci | 2 |
| dec8 | DEC West European | dec8_swedish_ci | 1 |
| cp850 | DOS West European | cp850_general_ci | 1 |
| hp8 | HP West European | hp8_english_ci | 1 |
| koi8r | KOI8-R Relcom Russian | koi8r_general_ci | 1 |
| latin1 | cp1252 West European | latin1_swedish_ci | 1 |
...................................................................略
實例：創建一個庫，指定字符集為utf8
MariaDB [(none)]> create database test2_utf8 character set utf8 collate utf8_general_ci;
Query OK, 1 row affected (0.00 sec)
MariaDB [(none)]> show create database test2_utf8;
+------------+---------------------------------------------------------------------+
| Database | Create Database |
+------------+---------------------------------------------------------------------+
| test2_utf8 | CREATE DATABASE `test2_utf8` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+------------+---------------------------------------------------------------------+
1 row in set (0.00 sec)
4.刪除數據庫
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
| test1 |
| test2_utf8 |
+--------------------+
6 rows in set (0.00 sec)
MariaDB [(none)]> drop database test1;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
| test2_utf8 |
+--------------------+
5 rows in set (0.01 sec)
上述所示：刪除數據庫test1成功！
5.進入數據庫中指定的庫
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
| test2_utf8 |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> use test2_utf8;
Database changed
MariaDB [test2_utf8]> select database();
+------------+
| database() |
+------------+
| test2_utf8 |
+------------+
1 row in set (0.00 sec)
6.查看進入當前數據庫的用戶
MariaDB [test2_utf8]> select user();
+----------------+
| user() |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)
7.刪除數據庫中的賬號
語法：drop user ‘user’@’主機域0 ’ <--註意引號，可以是單或雙引號，但是不能不加。
MariaDB [mysql]> select database();
+------------+
| database() |
+------------+
| mysql |
+------------+
1 row in set (0.00 sec)
MariaDB [mysql]> select user,host from mysql.user;
+------+-----------------------+
| user | host |
+------+-----------------------+
| root | 127.0.0.1 |
| root | ::1 |
| | localhost |
| root | localhost |
| | localhost.localdomain |
| root | localhost.localdomain |
+------+-----------------------+
6 rows in set (0.00 sec)
MariaDB [mysql]> drop user ‘root‘@‘::1‘;
Query OK, 0 rows affected (0.00 sec)
MariaDB [mysql]> select user,host from mysql.user;
+------+-----------------------+
| user | host |
+------+-----------------------+
| root | 127.0.0.1 |
| | localhost |
| root | localhost |
| | localhost.localdomain |
| root | localhost.localdomain |
+------+-----------------------+
5 rows in set (0.00 sec)
8.查看數據庫的用戶
MariaDB [mysql]> select user,host from mysql.user;
+------+-----------------------+
| user | host |
+------+-----------------------+
| root | 127.0.0.1 |
| | localhost |
| root | localhost |
| | localhost.localdomain |
| root | localhost.localdomain |
+------+-----------------------+
5 rows in set (0.00 sec)
mysql隨筆系列-1