CHAPTER 5 Inheritance and custom types @Lob @Column(name (Web host music)
Monday, December 31st, 2007CHAPTER 5 Inheritance and custom types @Lob @Column(name = “ITEM_IMAGE”) private byte[] image; The same is true for any property that is of type byte[], Byte[], or java. sql.Blob. Note that for all cases, except properties that are of java.sql.Clob or java.sql.Blob type, the values are again loaded immediately by Hibernate, and not lazily on demand. Instrumenting bytecode with interception code is again an option to enable lazy loading of individual properties transparently. To create and set a java.sql.Blob or java.sql.Clob value, if you have these property types in your domain model, use the static Hibernate.createBlob() and Hibernate.createClob() methods and provide a byte array, an input stream, or a string. Finally, note that both Hibernate and JPA provide a serialization fallback for any property type that is Serializable. This mapping type converts the value of a property to a byte stream that is then stored in a VARBINARY (or equivalent) column. When the owner of the property is loaded, the property value is deserialized. Naturally, you should use this strategy with extreme caution (data lives longer than an application), and it may be useful only for temporary data (user preferences, login session data, and so on). JDK mapping types Table 5.4 lists Hibernate types for various other Java types of the JDK that may be represented as a VARCHAR in the database. You may have noticed that
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