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The tasks that support the ZipFileset datatype are <zip>, <jar>, <war>, and <ear>. 3.11.2 Dirset The fileset datatype incorporates both files and directories, but some tasks prefer to only operate on directories. The <dirset> datatype is used in only the <javadoc> and <pathconvert> tasks. The path datatype also supports a nested <dirset>, which allows for easier construction of classpath elements for multiple directories. Filelist Recall that a fileset is an unordered collection of files and directories. When concatenating files or doing other operations that require a specific order, the filelist datatype comes in handy. The filelist datatype is supported in the <concat>, <dependset>, and <pathconvert> tasks, as well as a nested element within the <path> datatype.

Configuration cfg = new Configuration().configure(); SchemaUpdate schemaUpdate = new SchemaUpdate(cfg); schemaUpdate.execute(false);

The false setting at the end again disables printing of the SQL DDL to the console and only executes the statements directly on the database. If you export the DDL to the console or a text file, your DBA may be able to use it as a starting point to produce a quality schema-evolution script. Another hbm2ddl.auto setting useful in development is validate. It enables SchemaValidator to run at startup. This tool can compare your mapping against

ClassFileset The ClassFileset datatype can be used by reference wherever a fileset is used. It provides only the .class files that are explicitly referenced by a set of specified classes. This can be important when constructing a minimal archive, for example, and ship only the classes used. It is important to note, however, that classes referenced via reflection will not be considered dependencies, and therefore overlooked by ClassFileset.

the JDBC metadata and tell you if the schema and mappings match. You can also run SchemaValidator programmatically:

Perhaps the most important concept to fully understand in Ant is its notion of properties. Properties are loosely analogous to variables in that they are mappings between names and values and, not coincidentally, are very similar conceptually to java. util.Properties. Ant provides the built-in properties listed in table 3.7.

Configuration cfg = new Configuration().configure(); new SchemaValidator(cfg).validate();

Table 3.7 Name ant.file ant.home ant.java.version ant.project.name ant.version basedir Built-in properties Definition The absolute path of the build file. The path to executing version of Ant s root directory. The JVM version Ant detected; currently it can hold the values 1.1, 1.2, 1.3, and 1.4. The name of the project that is currently executing; it is set in the name attribute of <project>. The version of Ant. The absolute path of the project's basedir (as set with the basedir attribute of <project>).

An exception is thrown if a mismatch between the mappings and the database schema is detected. Because you re basing your build system on Ant, you ll ideally add a schemaexport target to your Ant build that generates and exports a fresh schema for your database whenever you need one (see listing 2.9).

Ant properties are typically, depending on the context of their use, denoted by ${property.name} within the build file. To examine the properties provided in table 3.7, we can use the <echo> task:

<taskdef name="hibernatetool" classname="org.hibernate.tool.ant.HibernateToolTask" classpathref="project.classpath"/> <target name="schemaexport" depends="compile, copymetafiles" description="Exports a generated schema to DB and file"> <hibernatetool destdir="${basedir}"> <classpath path="${build.dir}"/> <configuration configurationfile="${build.dir}/hibernate.cfg.xml"/> <hbm2ddl drop="true" create="true" export="true" outputfilename="helloworld-ddl.sql" delimiter=";" format="true"/> </hibernatetool> </target>

In this target, you first define a new Ant task that you d like to use, HibernateToolTask. This is a generic task that can do many things exporting an SQL DDL schema from Hibernate mapping metadata is only one of them. You ll use it throughout this chapter in all Ant builds. Make sure you include all Hibernate libraries, required third-party libraries, and your JDBC driver in the classpath of the task definition. You also need to add the hibernate-tools.jar file, which can be found in the Hibernate Tools download package.

<target name="echo"> <echo message="ant.file = ${ant.file}"/> <echo message="ant.home = ${ant.home}"/> <echo message="ant.java.version = ${ant.java.version}"/> <echo message="ant.version = ${ant.version}"/> <echo message="basedir = ${basedir}"/> </target>