Configure the CData JDBC Driver for Clarifai in a Connection Pool in Tomcat

The CData JDBC Drivers support standard JDBC interfaces to integrate with Web applications running on the JVM. This article details how to connect to Clarifai data from a connection pool in Tomcat.

Connect to Clarifai Data through a Connection Pool in Tomcat

1. Copy the CData JAR and CData .lic file to $CATALINA_HOME/lib. The CData JAR is located in the lib subfolder of the installation directory.
2. Add a definition of the resource to the context. Specify the JDBC URL here.

   Start by setting the Profile connection property to the location of the Clarifai Profile on disk (e.g. C:\profiles\Clarifai.apip). Next, set the ProfileSettings connection property to the connection string for Clarifai (see below).

   Clarifai API Profile Settings

   Clarifai uses Personal Access Tokens (PATs) for authentication. To obtain a PAT:

   1. Log in to your Clarifai account at https://clarifai.com.
   2. Navigate to your profile settings and select Security.
   3. Click Create Personal Access Token.
   4. Select the required scopes and click Create Token.
   5. Copy the generated token (it will only be shown once).

   After obtaining your Personal Access Token, set the following connection properties:

   • AuthScheme: Set this to APIKey.

   Set the following in the ProfileSettings connection property:

   • APIKey: Set this to your Clarifai Personal Access Token (PAT).

   Built-in Connection String Designer

   For assistance in constructing the JDBC URL, use the connection string designer built into the Clarifai JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

   
   java -jar cdata.jdbc.api.jar
   

   Fill in the connection properties and copy the connection string to the clipboard.

   

   You can see the JDBC URL specified in the resource definition below.

   
   
   <Resource name="jdbc/api"   auth="Container" type="javax.sql.DataSource" driverClassName="cdata.jdbc.api.APIDriver" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" url="jdbc:api:Profile=C:\profiles\Clarifai.apip;AuthScheme=APIKey;ProfileSettings='APIKey=your_personal_access_token';" maxActive="20" maxIdle="10" maxWait="-1" />
   

   To allow a single application to access Clarifai data, add the code above to the context.xml in the application's META-INF directory.

   For a shared resource configuration, add the code above to the context.xml located in $CATALINA_BASE/conf. A shared resource configuration provides connectivity to Clarifai for all applications.

3. Add a reference to the resource to the web.xml for the application.

   
   
     Clarifai data JSP
     jdbc/API
     javax.sql.DataSource
     Container
   
   

4. Initialize connections from the connection pool:

   
   Context initContext = new InitialContext();
   Context envContext  = (Context)initContext.lookup("java:/comp/env");
   DataSource ds = (DataSource)envContext.lookup("jdbc/API");
   Connection conn = ds.getConnection();
     

More Tomcat Integration

The steps above show how to connect to Clarifai data in a simple connection pooling scenario. For more use cases and information, see the JNDI Datasource How-To in the Tomcat documentation.