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Object-Relational Mapping (ORM) with SQL Analysis Services 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 SQL Analysis Services 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 SQL Analysis Services to generate an ORM of your SQL Analysis Services repository with Hibernate.

Though Eclipse is the IDE of choice for this article, the CData JDBC Driver for SQL Analysis Services works in any product that supports the Java Runtime Environment. In the Knowledge Base you will find tutorials to connect to SQL Analysis Services 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.ssas.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 SQL Analysis Services 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.ssas.SSASDriver
    • Connection URL: A JDBC URL, starting with jdbc:ssas: and followed by a semicolon-separated list of connection properties.

      接続するには、Url プロパティを有効なSQL Server Analysis Services エンドポイントに設定して認証を提供します。XMLA アクセスを使用して、HTTP 経由でホストされているSQL Server Analysis Services インスタンスに接続できます。 Microsoft ドキュメント configure HTTP access を参照してSQL Server Analysis Services に接続してください。

      SQL をSQL Server Analysis Services に実行するには、ヘルプドキュメントの「Analysis Services データの取得」を参照してください。接続ごとにメタデータを取得する代わりに、CacheLocation を設定できます。

      • HTTP 認証

        AuthScheme を"Basic" または"Digest" に設定してUser とPassword を設定します。CustomHeaders に他の認証値を指定します。

      • Windows (NTLM)

        Windows のUser とPassword を設定して、AuthScheme をNTLM に設定します。

      • Kerberos およびKerberos Delegation

        Kerberos を認証するには、AuthScheme をNEGOTIATE に設定します。Kerberos 委任を使うには、AuthScheme をKERBEROSDELEGATION に設定します。必要があれば、User、Password およびKerberosSPN を設定します。デフォルトでは、本製品は指定されたUrl でSPN と通信しようと試みます。

      • SSL/TLS:

        デフォルトでは、本製品はサーバーの証明書をシステムの信頼できる証明書ストアと照合してSSL/TLS のネゴシエーションを試みます。別の証明書を指定するには、利用可能なフォーマットについてヘルプドキュメントの「SSLServerCert」プロパティを参照してください。

      You can then access any cube as a relational table: When you connect the data provider retrieves SSAS metadata and dynamically updates the table schemas. Instead of retrieving metadata every connection, you can set the CacheLocation property to automatically cache to a simple file-based store.

      See the Getting Started section of the CData documentation, under Retrieving Analysis Services Data, to execute SQL-92 queries to the cubes.

      A typical JDBC URL is below:

      jdbc:ssas:User=myuseraccount;Password=mypassword;URL=http://localhost/OLAP/msmdpump.dll;

Connect Hibernate to SQL Analysis Services 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 SQL Analysis Services 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 SQL Analysis Services 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.ssas.SSASDriver jdbc:ssas:User=myuseraccount;Password=mypassword;URL=http://localhost/OLAP/msmdpump.dll; 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 Adventure_Works"; Query q = session.createQuery(SELECT); List resultList = (List) q.list(); for(Adventure_Works s: resultList){ System.out.println(s.getFiscal_Year()); System.out.println(s.getSales_Amount()); } } }
 
 
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