Create a Data Access Object for Coinbase Data using JDBI

JDBI is a SQL convenience library for Java that exposes two different style APIs, a fluent style and a SQL object style. The CData JDBC Driver for Coinbase integrates connectivity to live Coinbase data in Java applications. By pairing these technologies, you gain simple, programmatic access to Coinbase data. This article explains how to build a basic Data Access Object (DAO) and the accompanying code to read Coinbase data.

Create a DAO for the Coinbase Deposits Entity

The interface below declares the desired behavior for the SQL object to create a single method for each SQL statement to be implemented.

public interface MyDepositsDAO {
 //request specific data from Coinbase (String type is used for simplicity)
 @SqlQuery("SELECT Amount FROM Deposits WHERE Committed = :committed")
 String findAmountByCommitted(@Bind("committed") String committed);

 /*
 * close with no args is used to close the connection
 */
 void close();
}

Open a Connection to Coinbase

Collect the necessary connection properties and construct the appropriate JDBC URL for connecting to Coinbase.

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

Coinbase API Profile Settings

Coinbase uses OAuth-based authentication.

First you need to register an OAuth app with Coinbase. This is done from your account under 'Settings' > 'API Access' > 'New OAuth2 Application'.

After setting the following connection properties, you are ready to connect:

• AuthScheme: Set this to OAuth.
• InitiateOAuth: Set this to GETANDREFRESH. You can use InitiateOAuth to manage the process to obtain the OAuthAccessToken.
• OAuthClientId: Set this to the ClientID that is specified in you app settings.
• OAuthClientSecret: Set this to the ClientSecret that is specified in you app settings.
• CallbackURL: Set this to the Redirect URI you specified in your app settings.

Built-in Connection String Designer

For assistance in constructing the JDBC URL, use the connection string designer built into the Coinbase 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.

A connection string for Coinbase will typically look like the following:

jdbc:api:Profile=C:\profiles\Coinbase.apip;Authscheme=OAuth;OAuthClientId=your_client_id;OAuthClientSecret=your_client_secret;CallbackUrl=your_callback_url;

Use the configured JDBC URL to obtain an instance of the DAO interface. The particular method shown below will open a handle bound to the instance, so the instance needs to be closed explicitly to release the handle and the bound JDBC connection.

DBI dbi = new DBI("jdbc:api:Profile=C:\profiles\Coinbase.apip;Authscheme=OAuth;OAuthClientId=your_client_id;OAuthClientSecret=your_client_secret;CallbackUrl=your_callback_url;");
MyDepositsDAO dao = dbi.open(MyDepositsDAO.class);

//do stuff with the DAO

dao.close();

Read Coinbase Data

With the connection open to Coinbase, simply call the previously defined method to retrieve data from the Deposits entity in Coinbase.

//disply the result of our 'find' method
String amount = dao.findAmountByCommitted("true");
System.out.println(amount);

Since the JDBI library is able to work with JDBC connections, you can easily produce a SQL Object API for Coinbase by integrating with the CData JDBC Driver for Coinbase. Download a free trial and work with live Coinbase data in custom Java applications today.