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URL: https://www.cdata.com/kb/tech/alloydb-cloud-mendix.rst

⇱ Build AlloyDB-Connected Apps in Mendix

Build AlloyDB-Connected Apps in Mendix

👁 Dibyendu Datta
Dibyendu Datta
Lead Technology Evangelist
Use CData Connect AI to create an OData feed for AlloyDB Data and create custom apps in Mendix.

Mendix is a high-productivity app platform that allows you to build and maintain both mobile and web applications at-scale. When paired with CData Connect AI, Mendix provides instant, cloud-to-cloud access to AlloyDB data for applications. This article demonstrates how to connect to a CData Connect AI data source from within Mendix.

CData Connect AI provides a pure cloud-to-cloud interface for AlloyDB, allowing you to import data from live AlloyDB data in Mendix — without replicating the data to a natively supported database. As you build web and mobile applications from within Mendix, CData Connect AI pushes all supported SQL operations (filters, JOINs, etc.) directly to AlloyDB, leveraging server-side processing to return the requested AlloyDB data quickly.

Configure AlloyDB Connectivity for Mendix

To work with AlloyDB data from Mendix, we need to connect to AlloyDB from Connect AI, provide user access to the connection, and create a Workspace for the AlloyDB data.

Connect to AlloyDB from Connect AI

CData Connect AI uses a straightforward, point-and-click interface to connect to data sources.

  1. Log into Connect AI, click Sources, and then click Add Connection
    2. 👁 Adding a Connection
  2. Select "AlloyDB" from the Add Connection panel
    3. 👁 Selecting a data source
  3. Enter the necessary authentication properties to connect to AlloyDB.

    The following connection properties are usually required in order to connect to AlloyDB.

    • Server: The host name or IP of the server hosting the AlloyDB database.
    • User: The user which will be used to authenticate with the AlloyDB server.
    • Password: The password which will be used to authenticate with the AlloyDB server.

    You can also optionally set the following:

    • Database: The database to connect to when connecting to the AlloyDB Server. If this is not set, the user's default database will be used.
    • Port: The port of the server hosting the AlloyDB database. This property is set to 5432 by default.

    Authenticating with Standard Authentication

    Standard authentication (using the user/password combination supplied earlier) is the default form of authentication.

    No further action is required to leverage Standard Authentication to connect.

    Authenticating with pg_hba.conf Auth Schemes

    There are additional methods of authentication available which must be enabled in the pg_hba.conf file on the AlloyDB server.

    Find instructions about authentication setup on the AlloyDB Server here.

    Authenticating with MD5 Authentication

    This authentication method must be enabled by setting the auth-method in the pg_hba.conf file to md5.

    Authenticating with SASL Authentication

    This authentication method must be enabled by setting the auth-method in the pg_hba.conf file to scram-sha-256.

    Authenticating with Kerberos

    The authentication with Kerberos is initiated by AlloyDB Server when the ∏ is trying to connect to it. You should set up Kerberos on the AlloyDB Server to activate this authentication method. Once you have Kerberos authentication set up on the AlloyDB Server, see the Kerberos section of the help documentation for details on how to authenticate with Kerberos. 👁 Configuring a connection (Salesforce is shown)

  4. Click Save & Test
  5. Navigate to the Permissions tab in the Add AlloyDB Connection page and update the User-based permissions. 👁 Updating permissions

Add a Personal Access Token

When connecting to Connect AI through the REST API, the OData API, or the Virtual SQL Server, a Personal Access Token (PAT) is used to authenticate the connection to Connect AI. It is best practice to create a separate PAT for each service to maintain granularity of access.

  1. Click on the Gear icon () at the top right of the Connect AI app to open the settings page.
  2. On the Settings page, go to the Access Tokens section and click Create PAT.
  3. Give the PAT a name and click Create. 👁 Creating a new PAT
  4. The personal access token is only visible at creation, so be sure to copy it and store it securely for future use.

Configure AlloyDB Endpoints for Mendix

After connecting to AlloyDB, create a workspace for your desired table(s).

  1. Navigate to the Workspaces page and click Add to create a new Workspace (or select an existing workspace). 👁 The Workspaces page.
    👁 Adding a new Workspace.
  2. Click Add to add new assets to the Workspace.
  3. Select the AlloyDB connection (e.g. AlloyDB1) and click Next. 👁 Selecting an Asset (Salesforce is shown).
  4. Select the table(s) you wish to work with and click Confirm. 👁 Selecting Tables (Salesforce is shown).
  5. Make note of the OData Service URL for your workspace, e.g. https://cloud.cdata.com/api/odata/{workspace_name}

With the connection, PAT, and Workspace configured, you are ready to connect to AlloyDB data from Mendix.

Build a AlloyDB-Connected App

Downloading the OData Metadata File

When creating a connection in Mendix, the connection flow requires a Data Source Contract File. Follow these steps to download the OData metadata file for CData Connect AI using curl, a command line tool:

  1. Open a command-line window for your operating system. On Windows, open the start menu, type cmd, and press the Enter key to open a command prompt. On macOS and Linux, open a Terminal window.
  2. To check if curl is installed on your system, type curl -help and press the enter key. If it is not installed, install it from the curl website.
  3. Issue the following curl command, replacing USER with your CData Connect AI username and PAT with the PAT you generated above: 
    curl -u USER:PAT https://cloud.cdata.com/api/odata/{workspace_name}/$metadata -o metadata.xml
  4. Locate the metadata.xml file that the curl command created and move it to an accessible location.

Connecting to CData Connect AI in Mendix

Follow these steps to establish a connection from Mendix to CData Connect AI:

  1. Login to Mendix and open the Data Hub page.
    2. 👁 Mendix landing page
  2. In the Register a Data Source section, select OData.
    3. 👁 Registering an OData data source
  3. Upload the metadata.xml file from the steps above and click Next.
    4. 👁 Uploading metadata file
  4. Enter your desired values for Data Source Name and Data Source Version. In the Data Source Relative Path field, enter /api/odata/{workspace_name} and click Next.
    5. 👁 Creating the data source
  5. On the Application information page, click Register a new application.
    6. 👁 Register new app
  6. Enter a name in Application Name and select a technical owner (by default, this is the user who is currently logged in).
    7. 👁 Filling in fields for the app
  7. Click Next. In the Environment Name field, enter a desired name (for example, CData Connect AI). In the Environment Location field, enter https://cloud.cdata.com and select the appropriate Environment Type (e.g. Production), depending on what is needed.
    8. 👁 Creating the environment
  8. Click Done! to create your connection.
    9. 👁 Finalizing the connection

You can now use your connection in Mendix Studio Pro to easily create applications with access to live AlloyDB data.

Get CData Connect AI

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