Java Reference
In-Depth Information
Named queries are explained in detail in the next subsection.
In the next screen in the wizard, we can select how associated entities will be
fetched (eagerly or lazily). The default behavior is to fetch one-to-one and many-to-one
relationships eagerly, and one-to-many and many-to-many relationships lazily.
Additionally, we can select what collection type to use for the many side of a
one-to-many or many-to-many relationship. The default value is java.util.
Collection , and other valid values are java.util.List and java.util.Set .
Checking the Fully Qualified Database Table Names checkbox results in the catalog
and schema elements of the table being mapped to the @Table annotation for each
generated entity.
Checking the Attributes for Regenerating Tables checkbox results in the generated
@Column annotations having attributes such as length , which specifies the maximum
length allowed in the column; nullable , which specifies whether null values are
allowed in the column; and precision and scale , which specify the precision
and scale of decimal values, respectively. Checking this checkbox also adds the
uniqueConstraints attribute to the generated @Table annotation to specify any
unique constraints that apply to the table, if necessary.
Search WWH ::

Custom Search