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

Create a DAO for the Google Calendar VacationCalendar 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 MyVacationCalendarDAO {
 //insert new data into Google Calendar
 @SqlUpdate("INSERT INTO VacationCalendar (SearchTerms, StartDateTime) values (:searchTerms, :startDateTime)")
 void insert(@Bind("searchTerms") String searchTerms, @Bind("startDateTime") String startDateTime);

 //request specific data from Google Calendar (String type is used for simplicity)
 @SqlQuery("SELECT StartDateTime FROM VacationCalendar WHERE SearchTerms = :searchTerms")
 String findStartDateTimeBySearchTerms(@Bind("searchTerms") String searchTerms);

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

Open a Connection to Google Calendar

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

You can connect to Google APIs on behalf of individual users or on behalf of a domain. Google uses the OAuth authentication standard. See the "Getting Started" section of the help documentation for a guide.

Built-in Connection String Designer

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

java -jar cdata.jdbc.googlecalendar.jar

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

A connection string for Google Calendar will typically look like the following:

jdbc:googlecalendar:

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:googlecalendar:");
MyVacationCalendarDAO dao = dbi.open(MyVacationCalendarDAO.class);

//do stuff with the DAO

dao.close();

Read Google Calendar Data

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

//disply the result of our 'find' method
String startDateTime = dao.findStartDateTimeBySearchTerms("beach trip");
System.out.println(startDateTime);

Write Google Calendar Data

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

//add a new entry to the VacationCalendar entity
dao.insert(newSearchTerms, newStartDateTime);

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