Object-Relational Mapping (ORM) with Zuora Data Entities in Java

You can use Hibernate to map object-oriented domain models to a traditional relational database. The tutorial below shows how to use the CData JDBC Driver for Zuora to generate an ORM of your Zuora repository with Hibernate.

Though Eclipse is the IDE of choice for this article, the CData JDBC Driver for Zuora works in any product that supports the Java Runtime Environment. In the Knowledge Base you will find tutorials to connect to Zuora data from IntelliJ IDEA and NetBeans.

Install Hibernate

Follow the steps below to install the Hibernate plug-in in Eclipse.

1. In Eclipse, navigate to Help -> Install New Software.
2. Enter "http://download.jboss.org/jbosstools/neon/stable/updates/" in the Work With box.
3. Enter "Hibernate" into the filter box.
4. Select Hibernate Tools.

Start A New Project

Follow the steps below to add the driver JARs in a new project.

1. Create a new project. Select Java Project as your project type and click Next. Enter a project name and click Finish.
2. Right-click the project and click Properties. Click Java Build Path and then open the Libraries tab.
3. Click Add External JARs to add the cdata.jdbc.zuora.jar library, located in the lib subfolder of the installation directory.

Add a Hibernate Configuration File

Follow the steps below to configure connection properties to Zuora data.

1. Right-click on the new project and select New -> Hibernate -> Hibernate Configuration File (cfg.xml).
2. Select src as the parent folder and click Next.

3. Input the following values:

   • Hibernate version:: 5.2
   • Database dialect: Derby
   • Driver class: cdata.jdbc.zuora.ZuoraDriver

   • Connection URL: A JDBC URL, starting with jdbc:zuora: and followed by a semicolon-separated list of connection properties.

     Zuora uses the OAuth standard to authenticate users. See the online Help documentation for a full OAuth authentication guide.

     Configuring Tenant property

     In order to create a valid connection with the provider you need to choose one of the Tenant values (USProduction by default) which matches your account configuration. The following is a list with the available options:

     • USProduction: Requests sent to https://rest.zuora.com.
     • USAPISandbox: Requests sent to https://rest.apisandbox.zuora.com"
     • USPerformanceTest: Requests sent to https://rest.pt1.zuora.com"
     • EUProduction: Requests sent to https://rest.eu.zuora.com"
     • EUSandbox: Requests sent to https://rest.sandbox.eu.zuora.com"

     Selecting a Zuora Service

     Two Zuora services are available: Data Query and AQuA API. By default ZuoraService is set to AQuADataExport.

     DataQuery

     The Data Query feature enables you to export data from your Zuora tenant by performing asynchronous, read-only SQL queries. We recommend to use this service for quick lightweight SQL queries.

     Limitations
     • The maximum number of input records per table after filters have been applied: 1,000,000
     • The maximum number of output records: 100,000
     • The maximum number of simultaneous queries submitted for execution per tenant: 5
     • The maximum number of queued queries submitted for execution after reaching the limitation of simultaneous queries per tenant: 10
     • The maximum processing time for each query in hours: 1
     • The maximum size of memory allocated to each query in GB: 2
     • The maximum number of indices when using Index Join, in other words, the maximum number of records being returned by the left table based on the unique value used in the WHERE clause when using Index Join: 20,000

     AQuADataExport

     AQuA API export is designed to export all the records for all the objects ( tables ). AQuA query jobs have the following limitations:

     Limitations
     • If a query in an AQuA job is executed longer than 8 hours, this job will be killed automatically.
     • The killed AQuA job can be retried three times before returned as failed.

     Built-in Connection String Designer

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

     java -jar cdata.jdbc.zuora.jar

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

     A typical JDBC URL is below:

     jdbc:zuora:OAuthClientID=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;Tenant=USProduction;ZuoraService=DataQuery;InitiateOAuth=GETANDREFRESH

Connect Hibernate to Zuora Data

Follow the steps below to select the configuration you created in the previous step.

1. Switch to the Hibernate Configurations perspective: Window -> Open Perspective -> Hibernate.
2. Right-click on the Hibernate Configurations panel and click Add Configuration.
3. Set the Hibernate version to 5.2.
4. Click the Browse button and select the project.
5. For the Configuration file field, click Setup -> Use Existing and select the location of the hibernate.cfg.xml file (inside src folder in this demo).
6. In the Classpath tab, if there is nothing under User Entries, click Add External JARS and add the driver jar once more. Click OK once the configuration is done.
7. Expand the Database node of the newly created Hibernate configurations file.

Reverse Engineer Zuora Data

Follow the steps below to generate the reveng.xml configuration file. You will specify the tables you want to access as objects.

1. Switch back to the Package Explorer.
2. Right-click your project, select New -> Hibernate -> Hibernate Reverse Engineering File (reveng.xml). Click Next.
3. Select src as the parent folder and click Next.
4. In the Console configuration drop-down menu, select the Hibernate configuration file you created above and click Refresh.
5. Expand the node and choose the tables you want to reverse engineer. Click Finish when you are done.

Configure Hibernate to Run

Follow the steps below to generate plain old Java objects (POJO) for the Zuora tables.

1. From the menu bar, click Run -> Hibernate Code Generation -> Hibernate Code Generation Configurations.
2. In the Console configuration drop-down menu, select the Hibernate configuration file you created in the previous section. Click Browse by Output directory and select src.
3. Enable the Reverse Engineer from JDBC Connection checkbox. Click the Setup button, click Use Existing, and select the location of the hibernate.reveng.xml file (inside src folder in this demo).
4. In the Exporters tab, check Domain code (.java) and Hibernate XML Mappings (hbm.xml).
5. Click Run.

One or more POJOs are created based on the reverse-engineering setting in the previous step.

Insert Mapping Tags

For each mapping you have generated, you will need to create a mapping tag in hibernate.cfg.xml to point Hibernate to your mapping resource. Open hibernate.cfg.xml and insert the mapping tags as so:

Execute SQL

Using the entity you created from the last step, you can now search Zuora data: import java.util.*; import org.hibernate.Session; import org.hibernate.cfg.Configuration; import org.hibernate.query.Query; public class App { public static void main(final String[] args) { Session session = new Configuration().configure().buildSessionFactory().openSession(); String SELECT = "FROM Invoices I WHERE BillingState = :BillingState"; Query q = session.createQuery(SELECT, Invoices.class); q.setParameter("BillingState","CA"); List<Invoices> resultList = (List<Invoices>) q.list(); for(Invoices s: resultList){ System.out.println(s.getId()); System.out.println(s.getBillingCity()); } } }