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Chapter 5. Using Teiid with Hibernate

5.1. Limitations
5.2. Configuration

5.1. Limitations

Many Hibernate use cases assume a data source has the ability (with proper user permissions) to process Data Definition Language (DDL) statements like CREATE TABLE and DROP TABLE as well as Data Manipulation Language (DML) statements like SELECT, UPDATE, INSERT and DELETE. Teiid can handle a broad range of DML, but does not support DDL.

5.2. Configuration

For the most part, interacting with Teiid VDBs (Virtual Databases) from Hibernate is no different from working with any other type of data source.  First you must place Teiid JDBC API client JAR file and Teiid's hibernate dialect JAR in Hibernate’s classpath.  These files can be found in <jboss-install>/server/<profile>/lib directory.

These JAR files have the org.teiid.dialect.TeiidDialect and org.teiid.jdbc.TeiidDriver and org.teiid.jdbc.TeiidDataSource classes.

You then configure Hibernate (via hibernate.cfg.xml) as follows:

  1. Specify the Teiid driver class in the "connection.driver_class" property: 

    <property name="connection.driver_class">
     org.teiid.jdbc.TeiidDriver
</property>

  2. Specify the URL for the VDB in the "connection.url" property (replacing terms in angle brackets with the appropriate values): 

    <property name="connection.url">
	jdbc:metamatrix:<vdb-name>@mm://<host>:<port>;user=<user-name>;password=<password>
</property>

  3. Specify the Teiid dialect class in the “dialect” property: 

    <property name="dialect">
	org.teiid.dialect.TeiidDialect
</property>

    Alternatively, if you put your connection properties in hibernate.properties instead of hibernate.cfg.xml, they would look like this: 

    hibernate.connection.driver_class=org.teiid.jdbc.TeiidDriver
hibernate.connection.url=jdbc:teiid:<vdb-name>@mm://<host>:<port>
hibernate.connection.username=<user-name>
hibernate.connection.password=<password>
hibernate.dialect=org.teiid.dialect.TeiidDialect

Note also that since your VDBs will likely contain multiple source and view models with identical table names, you will need to fully qualify table names specified in Hibernate mapping files:

<class name="<Class name>" table="<Source/view model name>.[<schema name>.]<Table name>">
	...
</class>

Example 5.1. Example Mapping

<class name="org.teiid.example.Publisher" table="BOOKS.BOOKS.PUBLISHERS">
	...
</class>