python:pymysql [Notes]

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====== PyMySQL ======

  * [[sql:|SQL]]
  * [[https://github.com/PyMySQL/PyMySQL]]


----------
==== Installation ====

<code bash>
pip install PyMySQL
</code>


-----------
==== Exemple minimaliste ====

<code python>
import pymysql.cursors

# Connect to the database
connection = pymysql.connect(host='localhost',
                             user='user',
                             password='passwd',
                             db='db',
                             charset='utf8mb4',
                             cursorclass=pymysql.cursors.DictCursor)

try:
    with connection.cursor() as cursor:
        # Create a new record
        sql = "INSERT INTO `users` (`email`, `password`) VALUES (%s, %s)"
        cursor.execute(sql, ('webmaster@python.org', 'very-secret'))

    # connection is not autocommit by default. So you must commit to save
    # your changes.
    connection.commit()

    with connection.cursor() as cursor:
        # Read a single record
        sql = "SELECT `id`, `password` FROM `users` WHERE `email`=%s"
        cursor.execute(sql, ('webmaster@python.org',))
        result = cursor.fetchone()
        print(result)
finally:
    connection.close()
</code>


=== Fetch all ===

<code python>
cursor.execute("SELECT * FROM bookmark WHERE box_id = " + str(box['id']))
bookmarks = cursor.fetchall()

for bookmark in bookmarks:
    print(bookmark)
</code>


------
==== Batch requêtes ====

<code python>
data = [
  ('Jane', date(2005, 2, 12)),
  ('Joe', date(2006, 5, 23)),
  ('John', date(2010, 10, 3)),
]
stmt = "INSERT INTO employees (first_name, hire_date) VALUES (%s, %s)"
cursor.executemany(stmt, data)
</code>


----------------
==== Forcer SSL ====

Ajouter ''ssl={'ca': None}'' comme paramètre de ''pymysql.connect()''.


Si une erreur du type //SSL: Unsupported protocol// apparaît, une solution consiste à placer ces valeurs dans le fichier ''/etc/ssl/openssl.cnf'' ([[https://github.com/SySS-Research/Seth/issues/31#issuecomment-468430821|source]]):
<code cnf>
[system_default_sect]
MinProtocol = None
CipherString = DEFAULT
</code>