コマンド初心者(自分)のための備忘的なMySQLのコード

Web制作

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。

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