21.16. Generating schema with Ant

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If you would like to generate the database schema file with the Hibernate Tools Ant task, you simply need to use the
`org.hibernate.tool.ant.HibernateToolTask` to do so.  This task will generate the definitions of all entities, both of
which are audited by Envers and those which are not.

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For example:

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<pre class="prettyprint highlight">`&lt;target name="schemaexport" depends="build-demo" description="Exports a generated schema to DB and file"&gt;
  &lt;taskdef
    name="hibernatetool"
    classname="org.hibernate.tool.ant.HibernateToolTask"
    classpathref="build.demo.classpath"
  /&gt;
  &lt;hibernatetool destdir="."&gt;
    &lt;classpath&gt;
      &lt;fileset refid="lib.hibernate" /&gt;
      &lt;path location="${build.demo.dir}" /&gt;
      &lt;path location="${build.main.dir}" /&gt;
    &lt;/classpath&gt;
    &lt;jpaconfiguration persistenceunit="ConsolePU" /&gt;
    &lt;hbm2ddl
      drop="false"
      create="true"
      export="false"
      outputfilename="entities-ddl.sql"
      delimiter=";"
      format="true"
    /&gt;
  &lt;/hibernatetool&gt;
&lt;/target&gt;`</pre>
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Will generate the following schema:

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<pre class="prettyprint highlight">`create table Address (
    id integer generated by default as identity (start with 1),
    flatNumber integer,
    houseNumber integer,
    streetName varchar(255),
    primary key (id)
);

create table Address_AUD (
    id integer not null,
    REV integer not null,
    flatNumber integer,
    houseNumber integer,
    streetName varchar(255),
    REVTYPE tinyint,
    primary key (id, REV)
);

create table Person (
    id integer generated by default as identity (start with 1),
    name varchar(255),
    surname varchar(255),
    address_id integer,
    primary key (id)
);

create table Person_AUD (
    id integer not null,
    REV integer not null,
    name varchar(255),
    surname varchar(255),
    REVTYPE tinyint,
    address_id integer,
    primary key (id, REV)
);

create table REVINFO (
    REV integer generated by default as identity (start with 1),
    REVTSTMP bigint,
    primary key (REV)
);

alter table Person
    add constraint FK8E488775E4C3EA63
    foreign key (address_id)
    references Address;`</pre>
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