15-09-2021

docs/MySQL/bases.md

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+# Bases
+
+
+
+### Voir toutes les bases:
+
+`mysql> SHOW DATABASES;`
+
+```mysql
+MariaDB [(none)]> SHOW DATABASES;
++--------------------+
+| Database           |
++--------------------+
+| information_schema |
+| mysql              |
+| performance_schema |
+| sys                |
+| wordpress          |
++--------------------+
+```
+
+
+
+### Utiliser une base existante:
+
+`mysql> USE database;`
+
+```mysql
+MariaDB [(none)]> USE wordpress;
+Reading table information for completion of table and column names
+You can turn off this feature to get a quicker startup with -A
+
+Database changed
+MariaDB [wordpress]>
+```
+
+
+
+### Créer une base de donnée:
+
+`mysql> CREATE DATABASE database;`
+
+```mysql
+MariaDB [(none)]> CREATE DATABASE bdd;
+Query OK, 1 row affected (0.001 sec)
+```
+
+et donner les privilèges à un utilisateur (existant) sur cette base:
+
+```mysql
+MariaDB [(none)]> GRANT ALL ON bdd.* TO 'theuser'@'localhost';
+Query OK, 0 rows affected (0.021 sec)
+
+MariaDB [(none)]> FLUSH PRIVILEGES
+```
+
+ou à un utilisateur qui n'existe pas encore:
+
+```mysql
+MariaDB [(none)]> GRANT ALL ON bdd.* TO 'matrix'@'localhost' IDENTIFIED BY 'password';
+Query OK, 0 rows affected (0.030 sec)
+
+MariaDB [(none)]> FLUSH PRIVILEGES
+```
+
+L'utilisateur 'matrix' sera crée.
+
+
+
+`mysql> CREATE DATABASE IF NOT EXISTS database;`
+
+Avec `IF NOT EXISTS`, la base est créée uniquement si il n'y a pas de conflit de nom. Sans, MySQL envoie une erreur.
+
+```mysql
+MariaDB [(none)]> CREATE DATABASE IF NOT EXISTS bdd;
+Query OK, 1 row affected (0.003 sec)
+```
+
+
+
+`CHARACTER SET`  `COLLATE`
+
+```mariadb
+MariaDB [(none)]> CREATE DATABASE mydatabase CHARACTER SET utf8 COLLATE utf8_general_ci;
+Query OK, 1 row affected (0.005 sec)
+```
+
+
+
+### Supprimer une base:
+
+`mysql> DROP DATABASE database;`
+
+```mysql
+MariaDB [(none)]> DROP DATABASE bdd;
+Query OK, 0 rows affected (0.074 sec)
+```
+
+Ajouter `IF EXISTS` évite le message d'erreur si la base n'existe pas:
+
+```mariadb
+MariaDB [(none)]> DROP DATABASE IF EXISTS zenphoto;
+Query OK, 0 rows affected, 1 warning (0.000 sec)
+```
+
+```mariadb
+MariaDB [(none)]> DROP DATABASE zenphoto;
+ERROR 1008 (HY000): Can't drop database 'zenphoto'; database doesn't exist
+```
+
+
+
+#### Bases dans macOS:
+
+Les bases se trouvent dans: `$(brew --prefix)/var/mysql`
+
+**mac intel:**
+
+```bash
+bruno@SilverBook: /usr/local/var/mysql $ l
+total 245920
+-rw-rw----   1 bruno  admin      6519 15 oct 17:48 SilverBook.local.err
+-rw-rw----   1 bruno  admin         5 15 oct 17:48 SilverBook.local.pid
+-rw-rw----   1 bruno  admin     24576 15 oct 17:46 aria_log.00000001
+-rw-rw----   1 bruno  admin        52 15 oct 17:46 aria_log_control
+-rw-r-----   1 bruno  admin       976 15 oct 17:46 ib_buffer_pool
+-rw-rw----   1 bruno  admin  50331648 15 oct 17:48 ib_logfile0
+-rw-rw----   1 bruno  admin  50331648  6 aoû 20:18 ib_logfile1
+-rw-rw----   1 bruno  admin  12582912 15 oct 17:46 ibdata1
+-rw-rw----   1 bruno  admin  12582912 15 oct 17:48 ibtmp1
+-rw-rw----   1 bruno  admin         0  6 aoû 20:18 multi-master.info
+drwx------  90 bruno  admin      2880  6 aoû 20:18 mysql
+drwx------   3 bruno  admin        96  6 aoû 20:18 performance_schema
+-rw-rw----   1 bruno  admin      3047 11 aoû 22:49 silverbook-1.home.err
+-rw-rw----   1 bruno  admin     30926 15 oct 17:46 silverbook.home.err
+```
+
+**mac M1:**
+
+```bash
+❯ cd /opt/homebrew/var/mysql
+total 123324
+-rw-rw----   1 bruno admin      7308 sep  2 16:19 AirBook.err
+-rw-rw----   1 bruno admin         5 aoû 11 23:09 airbook.pid
+-rw-rw----   1 bruno admin    417792 sep  3 18:18 aria_log.00000001
+-rw-rw----   1 bruno admin        52 aoû 11 22:49 aria_log_control
+-rw-rw----   1 bruno admin     16384 sep  3 18:18 ddl_recovery.log
+-rw-r-----   1 bruno admin       946 aoû 11 22:49 ib_buffer_pool
+-rw-rw----   1 bruno admin 100663296 sep  3 18:18 ib_logfile0
+-rw-rw----   1 bruno admin  12582912 aoû 11 22:49 ibdata1
+-rw-rw----   1 bruno admin  12582912 aoû 11 23:09 ibtmp1
+-rw-rw----   1 bruno admin         0 jul 29 09:44 multi-master.info
+drwx------  90 bruno admin      2880 sep  3 18:18 mysql
+drwx------   3 bruno admin        96 jul 29 09:43 performance_schema
+drwx------ 109 bruno admin      3488 sep  3 18:18 sys
+drwx------  27 bruno admin       864 sep  3 18:18 wordpress
+```
+