IBM Informix Developer's Handbook - IBM Redbooks

Note: You can find a patch that adds Informix SQL optimizations to the original
Hibernate dialect for Informix databases at:
http://www.iiug.org/opensource/files/hibernate-3.3.2_informix.tar.gz
The XML configuration file allows the inclusion of XML mapping files. Use the
mapping resource property to specify the XML file that contains the mapping
between the SQL table and the Java object.
Example 6-3 on page 196 includes the State.hbm.xml mapping file as part of the
hibernate configuration, as shown in the following line:
Properties, such as hibernate.show_sql or hbm2ddl.auto, control the behavior
of the Hibernate service. Use the hibernate.show_sql property to dump all the
SQL statements to the console, which might be useful for debugging purposes.
Set the hbm2ddl.auto property to update to specify that the schema for the SQL
table is updated automatically if it differs from the definition in the XML definition.
For more information regarding all the supported properties for the Hibernate
configuration files, refer to:
http://docs.jboss.org/hibernate/core/3.3/reference/en/html/session-configuration
.html
XML mapping file
You can use the XML mapping file to specify the relations between a Java object
and an SQL database object. These mapping definitions are used to provide
Hibernate with the information that is needed to persist the Java objects into the
relational database. They also provide support features, such as creating the
database schema and relationship between the objects.
XML mapping files are not required when using Java annotations. The mapping
information is added using annotations in the Java source code.
Example 6-4 shows a basic XML file used to map the States table to the State
Java object.
Example 6-4 The State.hbm.xml file