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Get the Report →Object-Relational Mapping (ORM) with BigQuery Data Entities in Java
Object-relational mapping (ORM) techniques make it easier to work with relational data sources and can bridge your logical business model with your physical storage model. Follow this tutorial to integrate connectivity to BigQuery data into a Java-based ORM framework, Hibernate.
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 BigQuery to generate an ORM of your BigQuery repository with Hibernate.
Though Eclipse is the IDE of choice for this article, the CData JDBC Driver for BigQuery works in any product that supports the Java Runtime Environment. In the Knowledge Base you will find tutorials to connect to BigQuery data from IntelliJ IDEA and NetBeans.
About BigQuery Data Integration
CData simplifies access and integration of live Google BigQuery data. Our customers leverage CData connectivity to:
- Simplify access to BigQuery with broad out-of-the-box support for authentication schemes, including OAuth, OAuth JWT, and GCP Instance.
- Enhance data workflows with Bi-directional data access between BigQuery and other applications.
- Perform key BigQuery actions like starting, retrieving, and canceling jobs; deleting tables; or insert job loads through SQL stored procedures.
Most CData customers are using Google BigQuery as their data warehouse and so use CData solutions to migrate business data from separate sources into BigQuery for comprehensive analytics. Other customers use our connectivity to analyze and report on their Google BigQuery data, with many customers using both solutions.
For more details on how CData enhances your Google BigQuery experience, check out our blog post: https://www.cdata.com/blog/what-is-bigquery
Getting Started
Install Hibernate
Follow the steps below to install the Hibernate plug-in in Eclipse.
- In Eclipse, navigate to Help -> Install New Software.
- Enter "http://download.jboss.org/jbosstools/neon/stable/updates/" in the Work With box.
- Enter "Hibernate" into the filter box.
- Select Hibernate Tools.
Start A New Project
Follow the steps below to add the driver JARs in a new project.
- Create a new project. Select Java Project as your project type and click Next. Enter a project name and click Finish.
- Right-click the project and click Properties. Click Java Build Path and then open the Libraries tab.
- Click Add External JARs to add the cdata.jdbc.googlebigquery.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 BigQuery data.
- Right-click on the new project and select New -> Hibernate -> Hibernate Configuration File (cfg.xml).
- Select src as the parent folder and click Next.
Input the following values:
- Hibernate version:: 5.2
- Database dialect: Derby
- Driver class: cdata.jdbc.googlebigquery.GoogleBigQueryDriver
Connection URL: A JDBC URL, starting with jdbc:googlebigquery: and followed by a semicolon-separated list of connection properties.
Google uses the OAuth authentication standard. To access Google APIs on behalf of individual users, you can use the embedded credentials or you can register your own OAuth app.
OAuth also enables you to use a service account to connect on behalf of users in a Google Apps domain. To authenticate with a service account, you will need to register an application to obtain the OAuth JWT values.
In addition to the OAuth values, you will need to specify the DatasetId and ProjectId. See the "Getting Started" chapter of the help documentation for a guide to using OAuth.
Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the BigQuery JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.googlebigquery.jar
Fill in the connection properties and copy the connection string to the clipboard.
A typical JDBC URL is below:
jdbc:googlebigquery:DataSetId=MyDataSetId;ProjectId=MyProjectId;InitiateOAuth=GETANDREFRESH
Connect Hibernate to BigQuery Data
Follow the steps below to select the configuration you created in the previous step.
- Switch to the Hibernate Configurations perspective: Window -> Open Perspective -> Hibernate.
- Right-click on the Hibernate Configurations panel and click Add Configuration.
- Set the Hibernate version to 5.2.
- Click the Browse button and select the project.
- 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).
- 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.
- Expand the Database node of the newly created Hibernate configurations file.
Reverse Engineer BigQuery Data
Follow the steps below to generate the reveng.xml configuration file. You will specify the tables you want to access as objects.
- Switch back to the Package Explorer.
- Right-click your project, select New -> Hibernate -> Hibernate Reverse Engineering File (reveng.xml). Click Next.
- Select src as the parent folder and click Next.
- In the Console configuration drop-down menu, select the Hibernate configuration file you created above and click Refresh.
- 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 BigQuery tables.
- From the menu bar, click Run -> Hibernate Code Generation -> Hibernate Code Generation Configurations.
- 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.
- 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).
- In the Exporters tab, check Domain code (.java) and Hibernate XML Mappings (hbm.xml).
- 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:
cdata.googlebigquery.GoogleBigQueryDriver
jdbc:googlebigquery:DataSetId=MyDataSetId;ProjectId=MyProjectId;InitiateOAuth=GETANDREFRESH
org.hibernate.dialect.SQLServerDialect
Execute SQL
Using the entity you created from the last step, you can now search and modify BigQuery 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 Orders O WHERE ShipCity = :ShipCity";
Query q = session.createQuery(SELECT, Orders.class);
q.setParameter("ShipCity","New York");
List<Orders> resultList = (List<Orders>) q.list();
for(Orders s: resultList){
System.out.println(s.getOrderName());
System.out.println(s.getFreight());
}
}
}