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Create a Data Access Object for Dropbox Data using JDBI


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

Create a DAO for the Dropbox Files 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 MyFilesDAO { //insert new data into Dropbox @SqlUpdate("INSERT INTO Files (Id, Name) values (:id, :name)") void insert(@Bind("id") String id, @Bind("name") String name); //request specific data from Dropbox (String type is used for simplicity) @SqlQuery("SELECT Name FROM Files WHERE Id = :id") String findNameById(@Bind("id") String id); /* * close with no args is used to close the connection */ void close(); }

Open a Connection to Dropbox

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

Dropbox uses the OAuth authentication standard. To authenticate using OAuth, you can use the embedded credentials or register an app with Dropbox.

See the Getting Started guide in the CData driver documentation for more information.

Built-in Connection String Designer

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

java -jar cdata.jdbc.dropbox.jar

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

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

jdbc:dropbox:InitiateOAuth=GETANDREFRESH

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:dropbox:InitiateOAuth=GETANDREFRESH"); MyFilesDAO dao = dbi.open(MyFilesDAO.class); //do stuff with the DAO dao.close();

Read Dropbox Data

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

//disply the result of our 'find' method String name = dao.findNameById("1"); System.out.println(name);

Write Dropbox Data

It is also simple to write data to Dropbox, using the previously defined method.

//add a new entry to the Files entity dao.insert(newId, newName);

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

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