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Object-Relational Mapping (ORM) with SAP Netweaver Gateway 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 SAP Netweaver Gateway 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 SAP Netweaver Gateway to generate an ORM of your SAP Netweaver Gateway repository with Hibernate.

Though Eclipse is the IDE of choice for this article, the CData JDBC Driver for SAP Netweaver Gateway works in any product that supports the Java Runtime Environment. In the Knowledge Base you will find tutorials to connect to SAP Netweaver Gateway 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/updates/stable/" 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.sapgateway.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 SAP Netweaver Gateway 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:

    • Database dialect: SQL Server
    • Driver class: cdata.jdbc.sapgateway.SAPGatewayDriver
    • Connection URL: A JDBC URL, starting with jdbc:sapgateway: and followed by a semicolon-separated list of connection properties.

      SAP Gateway はBasic 認証とOAuth 2.0 認証の両方を許可します。Basic 認証を使用して自分のアカウントに接続するか、OAuth を使用して他のユーザーが彼らのアカウントでサービスからデータを取得できるようにすることができます。基本となる認証情報に加え、SAP Gateway テーブルへのアクセスには以下の追加プロパティが必要です。

      • Url: 環境のURL、またはサービスの完全URL に設定。例えば、完全URL は次のようになります:https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/。この例では、環境URL は次のようになります:https://sapes5.sapdevcenter.com。
      • Namespace: 適切なService Namespace を設定。先ほどの例では、IWBEP が名前空間です。サービスへの完全URL が指定されている場合は任意です。
      • Service: データを取得するサービスに設定。先ほどの例では、サービスはGWSAMPLE_BASIC です。完全URL が指定されている場合は必須ではありません。

      Basic 認証での認証

      Basic 認証では、自分のログインクレデンシャルを使用して接続します。次のプロパティを設定します。

      • User: これはSAP Gateway へのログインに使用するユーザー名です。
      • Password: これはSAP Gateway へのログインに使用するパスワードです。

      OAuth 認証での認証

      ユーザー資格情報の接続プロパティを設定せずに接続できます。 接続すると、本製品はデフォルトブラウザでSAP Gateway OAuth エンドポイントを開きます。ログインして、本製品にアクセス許可を与えます。本製品が以下のOAuth プロセスを完了します。 他のOAuth 認証フローについては、ヘルプドキュメントの「OAuth 認証の使用」を参照してください。

      A typical JDBC URL is below:

      jdbc:sapgateway:User=user;Password=password;URL=https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/;

Connect Hibernate to SAP Netweaver Gateway 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. Click the Browse button and select the project.
  4. 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).
  5. Expand the Database node of the newly created Hibernate configurations file.

Reverse Engineer SAP Netweaver Gateway 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 SAP Netweaver Gateway 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:

cdata.sapgateway.SAPGatewayDriver jdbc:sapgateway:User=user;Password=password;URL=https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/; org.hibernate.dialect.SQLServerDialect

Execute CRUD Commands

Using the entity you created from the last step, you can now perform CRUD commands. For example:

import java.util.*; import org.hibernate.*; import org.hibernate.cfg.Configuration; public class App { public static void main(final String[] args) { Session session = new Configuration().configure().buildSessionFactory().openSession(); String SELECT = "FROM SalesOrderLineItems"; Query q = session.createQuery(SELECT); List resultList = (List) q.list(); for(SalesOrderLineItems s: resultList){ System.out.println(s.getProductID()); System.out.println(s.getQuantity()); } } }
 
 
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