Accessing an external database
Because Anvil apps have a full Python instance in the back-end, you can use a database driver to access an external database from your Server Modules.
MySQL
You can use a MySQL driver such as Pymysql to control your MySQL database server, as you would in any Python environment.
Here’s an example of querying a MySQL database from an Anvil server function:
import pymysql
def connect():
connection = pymysql.connect(host='db.example.com',
port=3306,
user='root',
password=anvil.secrets.get_secret('db_password'),
cursorclass=pymysql.cursors.DictCursor)
return connection
@anvil.server.callable
def get_people():
conn = connect()
with conn.cursor() as cur:
cur.execute("SELECT name,date_of_birth,score FROM users")
return cur.fetchall()And here’s how you’d use it in your Forms to display data with a Data Grid:
class Form1(Form1Template):
def __init__(self, **properties):
# Set Form properties and Data Bindings.
self.init_components(**properties)
# Any code you write here will run before the form opens.
self.repeating_panel_1.items = anvil.server.call('get_people')(Note 1: This example uses the App Secrets service to store your database password encrypted, rather than leaving it “in the clear” in your source code.)
(Note 2: This example uses DictCursor to return SELECT results as lists of dictionaries. This data format is easy to use with Anvil’s Data Grids.)
PostgreSQL
You can use a Postgres driver such as Psycopg2 from a Server Module to control your Postgres database, as you would in any Python environment.
Here’s example code to query a Postgres database from an Anvil server function:
import psycopg2
import psycopg2.extras
def connect():
connection = psycopg2.connect(dbname='mydatabase',
host='db.example.com',
user='postgres',
password=anvil.secrets.get_secret('db_password'))
return connection
@anvil.server.callable
def get_people():
conn = connect()
with conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor) as cur:
cur.execute("SELECT name,date_of_birth,score FROM users")
return cur.fetchall()And here’s how you’d use it in your Forms to display data with a Data Grid:
class Form1(Form1Template):
def __init__(self, **properties):
# Set Form properties and Data Bindings.
self.init_components(**properties)
# Any code you write here will run before the form opens.
self.repeating_panel_1.items = anvil.server.call('get_people')(Note 1: This example uses the App Secrets service to store your database password encrypted, rather than leaving it “in the clear” in your source code.)
(Note 2: This example uses RealDictCursor to return SELECT results as lists of dictionaries. This data format is easy to use with Anvil’s Data Grids.)
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