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  • It generates a new POJO class for every table in the schema(s) specified
  • If a POJO class already exists for the table it edits the POJO file and updates it with the database definition:
    • New columns are added to the existing POJO
    • Removed columns are, well, removed
    • Metadata is updated where applicable
  • Existing code in POJO classes is mostly left alone, so it should be reasonably safe to re-run the generator on already existing code.
  • It has basic support for compound primary keys; it should properly generate XxxxId classes for class Xxxx if that table as a compound primary key
  • It adds all relations that are properly defined by foreign keys
    • It adds @ManyToOne parent references in the child class
    • It adds @OneToMany child list references as List<T> in the parent, with T the type of the child class
    • This however will not work for compound PK's.
  • It automatically recognizes and uses any @MappedSuperClass class as a base class for those tables that share colums with that base class.
  • It generates/updates [classname].properties files with the new properties in the class, so that these files can be used as resource bundles for the property names of that class.
  • It generates a class HibernateConfigurator which contains methods that add all classes to Hibernate's config.

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Warning

The directory and package are separate, so the final directory for the classes is formed by adding the source AND the package name.

The options supported are:

OptionShort
-dbDatabase connection string as username:password@hostname[:port]/databasename (required)
-dbtypeThe database type: postgres or oracle (required)
-sourceSpecifies the root of the source directory for both existing and generated sources
-pkgThe package name for the generated classes
-destroy-constructorsWhen set, this destroys all constructors in existing Java classes. It can be used to get rid of the silliness generated by the hibernate pojo tool
-ffrWhen set all field names are forcefully renamed to the name as decided by column name and prefix.
-frmWhen set all getter and setter methods in existing classes are renamed to whatever the property name is calculated to be
-nb, -no-bundlesDisable generation of .properties bundles
-no-baseclassDo not try to find base classes for new pojo's
-no-deserialPostgres 'serial' columns are actually just columns with a 'default' which retrieves a value from a generated sequence. By default the code will find this sequence and generate a SEQUENCE type of ID generator. Setting this option will cause the code to use the generated.IDENTITY method.
-no-onechar-booleanBy default, all columns found that are (var)char with a size of 1 and that contain <= 2 distinct values are generated as boolean with an appropriate @Type annotation. This option disables that.




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