Mapping with Annotations - Beginning Hibernate: From Novice to Professional - page 98

Table 6-1. Continued

Attribute Name Target Purpose

FieldResult Used as a parameter of the @SqlResultSetMapping

annotation, permits the fields of an entity to be
returned as columns in a conventional JDBC
ResultSet .

Pm

GeneratedValue M and F Allows generation strategies to be specified for the

marked entity's primary key value(s).

Id M and F Identifies the primary key of the entity. Placement

of the @Id attribute also determines whether the
default access mode for the entity class is field or
property access.

IdClass T Applied to indicate that an entity's primary key is

represented with columns corresponding to the
fields of another entity. The appropriate fields form-
ing the primary key will be marked with the @Id
attribute.

Inheritance

T Marks an entity as being the root of an entity inher-

itance hierarchy (i.e., the highest persistent class in
the class inheritance hierarchy).

JoinColumn / JoinColumns

T, M, and F Defines the column(s) being used as a foreign key

into another table.

JoinTable M and F Allows the details of the link table to be specified in

a one-to-many or many-to-many relationship.

Lob M and F Marks a field or property as being stored as a large

object data type—typically a binary large object
(BLOB). This can be used to remove the length limi-
tations on strings and binary data, but usually
implies reduced scope for querying the data so
marked.

ManyToMany

M and F Allows a many-to-many association to be defined

between entities.

ManyToOne M and F Allows a many-to-one association to be defined

between entities.

MapKey M and F Allows a key to be specified when making an associ-

ation with a Map object.

MappedSuperclass T Allows a non-persistence class to be used as the

basis of the mapping information for its derived
classes.

NamedNativeQuery /

Pk and T Allows a named SQL query to be stored in the

NamedNativeQueries

annotations.

NamedQuery / NamedQueries

Pk and T Allows a named EJB QL query to be stored in the

annotations.

OneToMany

M and F Allows a one-to-many association to be defined

between entities.

OneToOne

M and F Allows a one-to-one association to be defined

between entities.

OrderBy

MF Allows the ordering of a collection to be defined as

it is retrieved.