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プロジェクト型演習 #1 (raspberrypi DB操作)

Last updated at Posted at 2021-06-01

準備

phpインストール

pi@raspberry:~ $ sudo apt install php php php-cli php-curl
pi@raspberry:~ $ sudo a2enmod userdir
pi@raspberry:~ $ sudo systemctl restart apache2

phpファイル作成

pi@raspberry:~ $ cd /var/www/html
pi@raspberry:/var/www/html $ touch index.php
pi@raspberry:/var/www/html $ nano index.php
index.php
<?php
  phpinfo();
?>

phpの確認

pi@raspberry:/var/www/html $ cd ~

MariaDBインストール

pi@raspberry:~ $ sudo apt-get install mariadb-server-10.0

DBへログインしユーザの作成

pi@raspberry:~ $ sudo mysql -u root
Enter password: raspberry
MariaDB[(none)]> CREATE USER 'pi'@'localhost' IDENTIFIED BY 'raspberry';
MariaDB[(none)]> grant all privileges on sample_db.* to 'pi'@'localhost'
    -> with grant option;
MariaDB[(none)]> exit
Bye

ユーザでログイン

pi@raspberry:~ $ sudo mysql -upi -praspberry

DBを作成

MariaDB[(none)]> create database sample_db;

作成したDBへ入る

MariaDB[(none)]> use sample_db
Database changed

テーブルの作成

MariaDB [sample_db]> create table sample_tb(num int,name varchar(50));
Query OK, 0 rows affected (0.24 sec)

テーブルへデータの挿入

MariaDB [sample_db]> insert into sample_tb values(1,'太郎');
Query OK, 1 row affected (0.06 sec)
MariaDB [sample_db]> insert into sample_tb values(2,'花子');
Query OK, 1 row affected (0.07 sec)
MariaDB[sample_db]> exit
Bye

Pythonで操作する

インストール

pi@raspberry:~ $ pip install mysql-connector-python
pi@raspberry:~ $ pip install mysqlclient

操作するプログラム作成

pi@raspberry:~ $ touch db_connect.py
pi@raspberry:~ $ nano db_connect.py
db_connect.py
import mysql.connector as mydb
import sys

def mysqlConnector(_host, _port, _user, _passwd, _dbname):
  try:
    resconn = mydb.connect(
      host=_host,
      port=_port,
      user=_user,
      password=_passwd,
      database=_dbname
    )
  except Exception as e:
    print('[DB Connection Error]', e)
    sys.exit(1)

  # 接続が切れた場合に自動的に再接続する
  resconn.ping(reconnect=True)

  return resconn


user = 'pi'
password = 'raspberry'
host = 'localhost'
db = 'sample_db'

conn = mysqlConnector(host, 3306, user, password, db)
cur = conn.cursor()
sql = 'SELECT * FROM sample_tb;'
cur.execute(sql)

rows = cur.fetchall()

for row in rows:
 print(row)

cur.close
conn.close

実行

pi@raspberry:~ $ python db_connect.py
(1, '太郎')
(2, '花子')

PHPからDB操作

PDOインストール

pi@raspberry:~ $ sudo apt-get -y install php-mysql
pi@raspberry:~ $ sudo service apache2 restart

ファイルの編集

pi@raspberry:~ $ cd /var/www/html
pi@raspberry:/var/www/html $ nano index.php
index.php
<?php
$hostdbname = 'mysql:host=localhost;dbname=sample_db;charset=UTF8';
$username = "pi";
$password = "raspberry";
$pdo = new PDO($hostdbname, $username, $password);
$pdo -> setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);

$sql = "SELECT * FROM sample_tb";
$stmt = $pdo -> query($sql);
foreach($stmt as $row){
  echo $row["num"];
  echo $row["name"];
}
?>
pi@raspberry:/var/www/html $ cd ~

実行

phpの確認

  • php.iniの位置 /etc/php/7.3/cli/php.ini

今後

  1. cを動かしてemボードからの通信検知
  2. cからShellScriptを呼び出す
  3. shellからpythonを呼び出して実行

参考

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