Can Hibernate Schema generation be used to generate DDL without database connection

Question

I'd like to use Hibernate' schema generation to generate DDL for a database that I cannot access directly from my PC, just using hibernate config files. I'd like to skip, if possible, the installation of a local oracle database. Can hibernate generate DDL for a "theoretical" database of the appropriate dialect, version, etc., or is this a pipe dream?

Are there other tools that can do this?

Answer 1

1. You can either use an In-memory database during testing phase ;

   hibernate.hbm2ddl.auto="update"

2. Or you can generate your DDL using the hibernatetool from Maven :

    <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-antrun-plugin</artifactId> <executions> <execution> <id>generate-test-sql-scripts</id> <phase>generate-test-resources</phase> <goals> <goal>run</goal> </goals> <configuration> <tasks> <property name="maven_test_classpath" refid="maven.test.classpath"/> <path id="hibernate_tools_path"> <pathelement path="${maven_test_classpath}"/> </path> <property name="hibernate_tools_classpath" refid="hibernate_tools_path"/> <taskdef name="hibernatetool" classname="org.hibernate.tool.ant.HibernateToolTask"/> <mkdir dir="${project.build.directory}/test-classes/hsqldb"/> <hibernatetool destdir="${project.build.directory}/test-classes/hsqldb"> <classpath refid="hibernate_tools_path"/> <jpaconfiguration persistenceunit="testPersistenceUnit" propertyfile="src/test/resources/META-INF/spring/jdbc.properties"/> <hbm2ddl drop="false" create="true" export="false" outputfilename="create_db.sql" delimiter=";" format="true"/> <hbm2ddl drop="true" create="false" export="false" outputfilename="drop_db.sql" delimiter=";" format="true"/> </hibernatetool> </tasks> </configuration> </execution> </executions> </plugin> 

   This Maven plugin will generate the following DDL files:

   • create_db.sql (containing all DDL statements for creating the DB)
   • drop_db.sql (containing all DDL statements for dropping the DB)

Answer 2

As of hibernate-tools 5.3 you can also use the integrated hibernate-tools-maven-plugin . There you should also find documentation on how to use it.

Unfortunatelly the maven-site with detailed description of the parameters/goals for it is not yet published but a little bit older version of it is available here .

There would be a PR ( #842 ) that would allow for the site to be generated... unfortunatelly it hasn't found its way in yet.