Hibernate 5. Generate SQL DDL into file

Question

I tried using this class:

Hibernate/JPA: Check generated sql before updating DB Schema (like .NET EF migrations)

I have the following code:

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Answer 1

I wrote a class for generating sql script depends on packages with entites.

Used version of hibernate is '5.3.7.Final'

public final class HibernateExporter {

    private static final Logger LOG = LoggerFactory.getLogger(HibernateExporter.class);
    private static final String OUTPUT_FILE = "schema.sql";
    private static final String DIALECT = "org.hibernate.dialect.H2Dialect";

    private List entityPackages;

    private HibernateExporter(List entityPackages) {
        this.entityPackages = entityPackages;
    }

    public static void main(String[] args) {
        final List entityPackages = Collections.singletonList("pakage.with.entites");

        HibernateExporter exporter = new HibernateExporter(entityPackages);
        exporter.export();
    }

    private void export() {
        SchemaExport export = new SchemaExport();
        export.setOutputFile(OUTPUT_FILE);
        export.setFormat(true);
        export.setDelimiter(";");
        EnumSet types = EnumSet.of(TargetType.SCRIPT);
        Metadata metadata = createMetadataSources().buildMetadata();
        export.execute(types, Action.CREATE, metadata);
    }

    private MetadataSources createMetadataSources() {
        MetadataSources metadata = new MetadataSources(
                new StandardServiceRegistryBuilder()
                        .applySetting("hibernate.dialect", DIALECT)
                        .build());

        for (String entityPackage : entityPackages) {
            final Reflections reflections = new Reflections(entityPackage);
            for (Class cl : reflections.getTypesAnnotatedWith(MappedSuperclass.class)) {
                metadata.addAnnotatedClass(cl);
                LOG.info(String.format("Mapped = %s", cl.getName()));
            }
            for (Class cl : reflections.getTypesAnnotatedWith(Entity.class)) {
                metadata.addAnnotatedClass(cl);
                LOG.info(String.format("Mapped = %s", cl.getName()));
            }
        }
        return metadata;
    }
}