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<property name="initialPrice" column="INITIAL_PRICE" not-null="true"/>
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JPA is based on a configuration by exception model, so you could rely on defaults.
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If a property of a persistent class isn t annotated, the following rules apply:
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Fine-grained models and mappings
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If the property is of a JDK type, it s automatically persistent. In other words, it s handled like <property name="propertyName"/> in a Hibernate XML mapping file. Otherwise, if the class of the property is annotated as @Embeddable, it s mapped as a component of the owning class. We ll discuss embedding of components later in this chapter. Otherwise, if the type of the property is Serializable, its value is stored in its serialized form. This usually isn t what you want, and you should always map Java classes instead of storing a heap of bytes in the database. Imagine maintaining a database with this binary information when the application is gone in a few years.
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If you don t want to rely on these defaults, apply the @Basic annotation on a particular property. The @Column annotation is the equivalent of the XML <column> element. Here is an example of how you declare a property s value as required:
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@Basic(optional = false) @Column(nullable = false) public BigDecimal getInitialPrice { return initialPrice; }
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The @Basic annotation marks the property as not optional on the Java object level. The second setting, nullable = false on the column mapping, is only responsible for the generation of a NOT NULL database constraint. The Hibernate JPA implementation treats both options the same way in any case, so you may as well use only one of the annotations for this purpose. In a JPA XML descriptor, this mapping looks the same:
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<entity class="auction.model.Item" access="PROPERTY"> <attributes> ... <basic name="initialPrice" optional="false"> <column nullable="false"/> </basic> </attributes> </entity>
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Quite a few options in Hibernate metadata are available to declare schema constraints, such as NOT NULL on a column. Except for simple nullability, however, they re only used to produce DDL when Hibernate exports a database schema from mapping metadata. We ll discuss customization of SQL, including DDL, in chapter 8, section 8.3, Improving schema DDL. On the other hand, the Hibernate Annotations package includes a more advanced and sophisticated data validation framework, which you can use not only to define database schema
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Mapping persistent classes
constraints in DDL, but also for data validation at runtime. We ll discuss it in chapter 17. Are annotations for properties always on the accessor methods Customizing property access Properties of a class are accessed by the persistence engine either directly (through fields) or indirectly (through getter and setter property accessor methods). In XML mapping files, you control the default access strategy for a class with the default-access="field|property|noop|custom.Class" attribute of the hibernate-mapping root element. An annotated entity inherits the default from the position of the mandatory @Id annotation. For example, if @Id has been declared on a field, not a getter method, all other property mapping annotations, like the name of the column for the item s description property, are also declared on fields:
@Column(name = "ITEM_DESCR") private String description; public String getDescription() { return description; }
This is the default behavior as defined by the JPA specification. However, Hibernate allows flexible customization of the access strategy with the @org.hibernate.annotations.AccessType(<strategy>) annotation:
If AccessType is set on the class/entity level, all attributes of the class are accessed according to the selected strategy. Attribute-level annotations are expected on either fields or getter methods, depending on the strategy. This setting overrides any defaults from the position of the standard @Id annotations. If an entity defaults or is explicitly set for field access, the AccessType("property") annotation on a field switches this particular attribute to runtime access through property getter/setter methods. The position of the AccessType annotation is still the field. If an entity defaults or is explicitly set for property access, the AccessType("field") annotation on a getter method switches this particular attribute to runtime access through a field of the same name. The position of the AccessType annotation is still the getter method. Any @Embedded class inherits the default or explicitly declared access strategy of the owning root entity class. Any @MappedSuperclass properties are accessed with the default or explicitly declared access strategy of the mapped entity class.
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