What does Hibernate map a boolean datatype to when using an Oracle database by default?

Question

By default if I create a field in an entity like:

@NotNull boolean myBoolean; 

And I let Hibernate auto-create my tables. What Oracle data type will this map to?

Answer 1

As @Arthur said it maps to Number(1) which would be the standard sql bit where 0 == false and 1 == true. As an alternative you can map char(1) to 'T' or 'F' like this

@org.hibernate.annotations.Type(type="true_false") @NotNull boolean myBoolean; 

or map it to 'Y' or 'N'

@org.hibernate.annotations.Type(type="yes_no") @NotNull boolean myBoolean; 

Answer 2

Simply Number(1)

If you want, use SchemaExport to generate a script to your target database. Something like

AnnotationConfiguration configuration = new AnnotationConfiguration();  configuration     .addAnnotatedClass(<TYPE_YOUR_CLASS>.class)     .setProperty(Environment.USER, <TYPE_YOUR_USER>)     .setProperty(Environment.PASS, <TYPE_YOUR_PASSWORD>)     .setProperty(Environment.URL, <TYPE_YOUR_URL>)     .setProperty(Environment.DIALECT, <TYPE_YOUR_DIALECT>)     .setProperty(Environment.DRIVER, <TYPE_YOUR_DRIVER>);  SchemaExport schema = new SchemaExport(configuration); schema.setOutputFile("schema.sql");  schema.create(<DO_YOU_WANT_TO_PRINT_TO_THE_CONSOLE>, <DO_YOU_WANT_TO_EXPORT_THE_SCRIPT_TO_THE_DATABASE>);