MySQLをコマンドから触ることが・・・たまにある。
WordPressのデータでちょっとデータベースの中をのぞきたい時に、データベース管理ツールのphpMyAdminにいかなくてもOKなので便利です。
データベースのCHARACTERや作成も少しはいってはいますが、それはそれで便利なのでメモ。
SSHでサーバーに接続する
ssh ユーザ名@server名 (-p port番号）
mysqlにアクセス
$ mysql -u root -p
Enter password:
パスワード入力
mysql>
データベースの確認
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| wordpress |
+--------------------+
3 rows in set (0.01 sec)
使用可能なCHARACTERを確認
mysql> 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 |
| latin2 | ISO 8859-2 Central European | latin2_general_ci | 1 |
| swe7 | 7bit Swedish | swe7_swedish_ci | 1 |
| ascii | US ASCII | ascii_general_ci | 1 |
| ujis | EUC-JP Japanese | ujis_japanese_ci | 3 |
| sjis | Shift-JIS Japanese | sjis_japanese_ci | 2 |
| hebrew | ISO 8859-8 Hebrew | hebrew_general_ci | 1 |
| tis620 | TIS620 Thai | tis620_thai_ci | 1 |
| euckr | EUC-KR Korean | euckr_korean_ci | 2 |
| koi8u | KOI8-U Ukrainian | koi8u_general_ci | 1 |
| gb2312 | GB2312 Simplified Chinese | gb2312_chinese_ci | 2 |
| greek | ISO 8859-7 Greek | greek_general_ci | 1 |
| cp1250 | Windows Central European | cp1250_general_ci | 1 |
| gbk | GBK Simplified Chinese | gbk_chinese_ci | 2 |
| latin5 | ISO 8859-9 Turkish | latin5_turkish_ci | 1 |
| armscii8 | ARMSCII-8 Armenian | armscii8_general_ci | 1 |
| utf8 | UTF-8 Unicode | utf8_general_ci | 3 |
| ucs2 | UCS-2 Unicode | ucs2_general_ci | 2 |
| cp866 | DOS Russian | cp866_general_ci | 1 |
| keybcs2 | DOS Kamenicky Czech-Slovak | keybcs2_general_ci | 1 |
| macce | Mac Central European | macce_general_ci | 1 |
| macroman | Mac West European | macroman_general_ci | 1 |
| cp852 | DOS Central European | cp852_general_ci | 1 |
| latin7 | ISO 8859-13 Baltic | latin7_general_ci | 1 |
| cp1251 | Windows Cyrillic | cp1251_general_ci | 1 |
| cp1256 | Windows Arabic | cp1256_general_ci | 1 |
| cp1257 | Windows Baltic | cp1257_general_ci | 1 |
| binary | Binary pseudo charset | binary | 1 |
| geostd8 | GEOSTD8 Georgian | geostd8_general_ci | 1 |
| cp932 | SJIS for Windows Japanese | cp932_japanese_ci | 2 |
| eucjpms | UJIS for Windows Japanese | eucjpms_japanese_ci | 3 |
+----------+-----------------------------+---------------------+--------+
characterをセットしてデータベースを作成
mysql> CREATE DATABASE test_db CHARACTER SET utf8;
Query OK, 1 row affected (0.03 sec)
データベースの文字コード確認
mysql> SHOW CREATE DATABASE test_db;
+----------+------------------------------------------------------------------+
| Database | Create Database |
+----------+------------------------------------------------------------------+
| test_db | CREATE DATABASE `test_db` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+----------+------------------------------------------------------------------+
1 row in set (0.00 sec)
データベースのテーブルを確認
mysql> SHOW TABLES FROM wordpress;
+------------------------+
| Tables_in_wordpress |
+------------------------+
| wp_commentmeta |
| wp_comments |
| wp_links |
| wp_options |
| wp_postmeta |
| wp_posts |
| wp_term_relationships |
| wp_term_taxonomy |
| wp_termmeta |
| wp_terms |
| wp_usermeta |
| wp_users |
+------------------------+
12 rows in set (0.02 sec)
テーブル構造を確認（データベース名とテーブル名を「.」どっとで連結
mysql> DESCRIBE wordpress.wp_options;
+--------------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+---------------------+------+-----+---------+----------------+
| option_id | bigint(20) unsigned | NO | PRI | NULL | auto_increment |
| option_name | varchar(191) | YES | UNI | NULL | |
| option_value | longtext | NO | | NULL | |
| autoload | varchar(20) | NO | | yes | |
+--------------+---------------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)
サイトのアドレスを表示
mysql> SELECT * FROM wordpress.wp_options WHERE option_name='home';
+-----------+-------------+------------------+----------+
| option_id | option_name | option_value | autoload |
+-----------+-------------+------------------+----------+
| 2 | home | http://xxxxx.com | yes |
+-----------+-------------+------------------+----------+
1 row in set (0.00 sec)
ふー。サイトのアドレス取得ができました。