Use Dash to Build to Web Apps on Sybase IQ Data

The rich ecosystem of Python modules lets you get to work quickly and integrate your systems more effectively. With the CData Python Connector for Sybase IQ, the pandas module, and the Dash framework, you can build Sybase IQ-connected web applications for Sybase IQ data. This article shows how to connect to Sybase IQ with the CData Connector and use pandas and Dash to build a simple web app for visualizing Sybase IQ data.

With built-in, optimized data processing, the CData Python Connector offers unmatched performance for interacting with live Sybase IQ data in Python. When you issue complex SQL queries from Sybase IQ, the driver pushes supported SQL operations, like filters and aggregations, directly to Sybase IQ and utilizes the embedded SQL engine to process unsupported operations client-side (often SQL functions and JOIN operations).

Connecting to Sybase IQ Data

Connecting to Sybase IQ data looks just like connecting to any relational data source. Create a connection string using the required connection properties. For this article, you will pass the connection string as a parameter to the create_engine function.

To connect to SybaseIQ, set User, Password, Server and Database properties. To secure connections with TLS/SSL, set UseSSL to TRUE.

After installing the CData Sybase IQ Connector, follow the procedure below to install the other required modules and start accessing Sybase IQ through Python objects.

Install Required Modules

Use the pip utility to install the required modules and frameworks:

pip install pandas
pip install dash
pip install dash-daq

Visualize Sybase IQ Data in Python

Once the required modules and frameworks are installed, we are ready to build our web app. Code snippets follow, but the full source code is available at the end of the article.

First, be sure to import the modules (including the CData Connector) with the following:

import os
import dash
import dash_core_components as dcc
import dash_html_components as html
import pandas as pd
import cdata.sybaseiq as mod
import plotly.graph_objs as go

You can now connect with a connection string. Use the connect function for the CData Sybase IQ Connector to create a connection for working with Sybase IQ data.

cnxn = mod.connect("User=myuser;Password=mypassword;Server=localhost;Database=Northwind")

Execute SQL to Sybase IQ

Use the read_sql function from pandas to execute any SQL statement and store the result set in a DataFrame.

df = pd.read_sql("SELECT ProductName, Price FROM Products WHERE ProductName = 'Konbu'", cnxn)

Configure the Web App

With the query results stored in a DataFrame, we can begin configuring the web app, assigning a name, stylesheet, and title.

app_name = 'dash-sybaseiqedataplot'

external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']

app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
app.title = 'CData + Dash'

Configure the Layout

The next step is to create a bar graph based on our Sybase IQ data and configure the app layout.

trace = go.Bar(x=df.ProductName, y=df.Price, name='ProductName')

app.layout = html.Div(children=[html.H1("CData Extension + Dash", style={'textAlign': 'center'}),
	dcc.Graph(
		id='example-graph',
		figure={
			'data': [trace],
			'layout':
			go.Layout(title='Sybase IQ Products Data', barmode='stack')
		})
], className="container")

Set the App to Run

With the connection, app, and layout configured, we are ready to run the app. The last lines of Python code follow.

if __name__ == '__main__':
    app.run_server(debug=True)

Now, use Python to run the web app and a browser to view the Sybase IQ data.

python sybaseiq-dash.py

Free Trial & More Information

Download a free, 30-day trial of the CData Python Connector for Sybase IQ to start building Python apps with connectivity to Sybase IQ data. Reach out to our Support Team if you have any questions.

Full Source Code

import os
import dash
import dash_core_components as dcc
import dash_html_components as html
import pandas as pd
import cdata.sybaseiq as mod
import plotly.graph_objs as go

cnxn = mod.connect("User=myuser;Password=mypassword;Server=localhost;Database=Northwind")

df = pd.read_sql("SELECT ProductName, Price FROM Products WHERE ProductName = 'Konbu'", cnxn)
app_name = 'dash-sybaseiqdataplot'

external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']

app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
app.title = 'CData + Dash'
trace = go.Bar(x=df.ProductName, y=df.Price, name='ProductName')

app.layout = html.Div(children=[html.H1("CData Extension + Dash", style={'textAlign': 'center'}),
	dcc.Graph(
		id='example-graph',
		figure={
			'data': [trace],
			'layout':
			go.Layout(title='Sybase IQ Products Data', barmode='stack')
		})
], className="container")

if __name__ == '__main__':
    app.run_server(debug=True)