@Lob

By default, a JPA persistence provider assumes that all persistent data can be represented as typical database data types.

Use the @Lob annotation with the @Basic mapping to specify that a persistent property or field should be persisted as a large object to a database-supported large object type.

A Lob may be either a binary or character type. The persistence provider infers the Lob type from the type of the persistent field or property.

For string and character-based types, the default is Clob. In all other cases, the default is Blob.

You can also use the @Column attribute columnDefinition to further refine the Lob type.

This annotation has no attributes. For more details, see the API.

Example 1-46 shows how to use this annotation to specify that persistent field pic should be persisted as a Blob.

Example 1-46 @Lob
@Entity public class Employee implements Serializable { ... @Lob @Basic(fetch=LAZY) @Column(name="EMP_PIC", columnDefinition="BLOB NOT NULL") protected byte[] pic; ... }

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