javax.persistence.Basic - JPA annotation
javax.persistence
Annotation Basic
- Target:
- Fields (including property get methods)
The simplest type of mapping to a database column. The
Basic annotation can be applied to a persistent property or instance variable of any of the following types: Java primitive types, wrappers of the primitive types, String, java.math.BigInteger, java.math.BigDecimal, java.util.Date, java.util.Calendar, java.sql.Date, java.sql.Time, java.sql.Timestamp, byte[], Byte[], char[], Character[], enums, and any other type that implements java.io.Serializable.
The use of the Basic annotation is optional for persistent fields and properties of these types. If the Basic annotation is not specified for such a field or property, the default values of the Basic annotation will apply.
Example 1:
@Basic protected String name;
Example 2:
@Basic(fetch=LAZY) protected String getName() { return name; }
- Since:
- JPA 1.0
(Optional) Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched. The
EAGER strategy is a requirement on the persistence provider runtime that the value must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime. If not specified, defaults to EAGER.
- Default value:
- javax.persistence.FetchType.EAGER
- Since:
- JPA 1.0
boolean optional
(Optional) Defines whether the value of the field or property may be null. This is a hint and is disregarded for primitive types; it may be used in schema generation. If not specified, defaults to
true.
- Default value:
- true
- Since:
- JPA 1.0
