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Create a Data Access Object for Open Exchange Rates Data using JDBI

A brief overview of creating a SQL Object API for Open Exchange Rates data in 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 Open Exchange Rates integrates connectivity to live Open Exchange Rates data in Java applications. By pairing these technologies, you gain simple, programmatic access to Open Exchange Rates data. This article walks through building a basic Data Access Object (DAO) and the accompanying code to read Open Exchange Rates data.

Create a DAO for the Open Exchange Rates Projects 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 MyProjectsDAO { //request specific data from Open Exchange Rates (String type is used for simplicity) @SqlQuery("SELECT Statistics_ViewCount FROM Projects WHERE Id = :id") String findStatistics_ViewCountById(@Bind("id") String id); /* * close with no args is used to close the connection */ void close(); }

Open a Connection to Open Exchange Rates

Collect the necessary connection properties and construct the appropriate JDBC URL for connecting to Open Exchange Rates.

The Open Exchange Rates API supports basic authentication with an App Id. After you register, your App Id is displayed in your account dashboard. Set this to the AppId connection property.

Built-in Connection String Designer

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

java -jar cdata.jdbc.openexchangerates.jar

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

A connection string for Open Exchange Rates will typically look like the following:

jdbc:openexchangerates:AppId=abc1234;

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:openexchangerates:AppId=abc1234;"); MyProjectsDAO dao = dbi.open(MyProjectsDAO.class); //do stuff with the DAO dao.close();

Read Open Exchange Rates Data

With the connection open to Open Exchange Rates, simply call the previously defined method to retrieve data from the Projects entity in Open Exchange Rates.

//disply the result of our 'find' method String statistics_ViewCount = dao.findStatistics_ViewCountById("MyProjectId"); System.out.println(statistics_ViewCount);

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