Create a Data Access Object for Google Translate 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 Google Translate integrates connectivity to live Google Translate data in Java applications. By pairing these technologies, you gain simple, programmatic access to Google Translate data. This article explains how to build a basic Data Access Object (DAO) and the accompanying code to read Google Translate data.

Create a DAO for the Google Translate SupportedLanguages 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 MySupportedLanguagesDAO {
  //request specific data from Google Translate (String type is used for simplicity)
  @SqlQuery("SELECT DisplayName FROM SupportedLanguages WHERE ProjectId = :projectId")
  String findDisplayNameByProjectId(@Bind("projectId") String projectId);

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

Open a Connection to Google Translate

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

Authentication

Google Cloud Translation API requires OAuth 2.0 authentication to ensure secure access to translation services, datasets, glossaries, and adaptive MT resources. This authentication method allows you to securely connect to your Google Cloud project and manage translation resources with proper authorization.

OAuth 2.0 Setup and Configuration

Step 1: Create Google Cloud Project and Enable API

To set up OAuth authentication:

1. Visit the Google Cloud Console
2. Create a new project or select an existing project
3. Note down your Project ID (required for all API calls)
4. Navigate to "APIs & Services" > "Library"
5. Search for and enable the "Cloud Translation API"
6. Go to "APIs & Services" > "Credentials"
7. Click "Create Credentials" and select "OAuth Client ID"
8. Configure the OAuth consent screen if prompted
9. Select "Desktop application" or "Web application" as appropriate
10. Set the authorized redirect URI (CallbackURL)
11. Copy the Client ID and Client Secret for use in your connection

Required Connection Properties

• AuthScheme: Set this to OAuth (required)
• OAuthClientId: Client ID from Google Cloud Console (required)
• OAuthClientSecret: Client secret from Google Cloud Console (required)
• CallbackURL: Redirect URI specified in your OAuth application (required)
• InitiateOAuth: Set to GETANDREFRESH for automatic token management (recommended)
• ProjectId: Your Google Cloud project ID or project number (required for queries)

Required OAuth Scopes

The Google Cloud Translation API Profile requires the following OAuth scope:

• https://www.googleapis.com/auth/cloud-translation - Full access to Cloud Translation API resources including translation, datasets, glossaries, and adaptive MT

Built-in Connection String Designer

For assistance in constructing the JDBC URL, use the connection string designer built into the Google Translate 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 Google Translate will typically look like the following:

jdbc:api:Profile=C:\profiles\GoogleTranslate.apip;AuthScheme=OAuth;InitiateOAuth=GETANDREFRESH;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\GoogleTranslate.apip;AuthScheme=OAuth;InitiateOAuth=GETANDREFRESH;OAuthClientId=your_client_id;OAuthClientSecret=your_client_secret;CallbackUrl=your_callback_url;");
MySupportedLanguagesDAO dao = dbi.open(MySupportedLanguagesDAO.class);

//do stuff with the DAO

dao.close();

Read Google Translate Data

With the connection open to Google Translate, simply call the previously defined method to retrieve data from the SupportedLanguages entity in Google Translate.

//disply the result of our 'find' method
String displayName = dao.findDisplayNameByProjectId("my-project-12345");
System.out.println(displayName);

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