sample app

examples/streamlit/db-connection/README.md

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+# DB Connection 
+
+This is a sample app for demonstrating DB connections in Streamlit. To run this app ensure you set the environment variable:
+
+```sh 
+export DB_URI=<uri>
+```
+
+Note that this URI is a [SQLAlchemy URI](https://docs.sqlalchemy.org/en/20/core/engines.html#database-urls).
+
+## Deployment
+
+When deploying this app on Ploomber Cloud you need to set the DB_URI as a secret. Refer to the [documentation](https://docs.cloud.ploomber.io/en/latest/user-guide/secrets.html) to learn more.

examples/streamlit/db-connection/app.py

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+import streamlit as st
+from sqlalchemy.sql import text
+from os import environ
+
+# Create the SQL connection to pets_db as specified in your secrets file.
+conn = st.connection(name="sqlite", type='sql', url=environ["DB_URI"])
+
+# Insert some data with conn.session.
+with conn.session as s:
+    s.execute(text('CREATE TABLE IF NOT EXISTS numbers (x INT, y INT);'))
+    s.execute(text('DELETE FROM numbers;'))
+    num_pairs = {'1': '1', '2': '4', '3': '9'}
+    for k in num_pairs:
+        s.execute(
+            text('INSERT INTO numbers (x, y) VALUES (:numx, :numy);'),
+            params=dict(numx=k, numy=num_pairs[k])
+        )
+    s.commit()
+
+# Query and display the data you inserted
+numbers = conn.query('select * from numbers')
+st.dataframe(numbers)

examples/streamlit/db-connection/requirements.txt

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+streamlit
+SQLAlchemy