AccessType用来定义访问Entity的方式:
1. AccessType.PROPERTY的例子:
@Entity(access=AccessType.PROPERTY) @Table(name = "Person") public class Person implements Serializable {
private Long id;
// auto-generated PK @Column(name="Id") @Id(generator="PersonIdGenerator") @SequenceGenerator(name="PersonIdGenerator", sequenceName="PersonIdGenerator") public Long getId() { return id; } public void setId(Long personId) { this.id = personId; } ...... }
2. AccessType.FIELD的例子: @Entity(access=AccessType.FIELD) @Table(name = "Country") public class Country implements Serializable { @Id(generator="CountryIdGenerator") @SequenceGenerator(name="CountryIdGenerator", sequenceName="CountryIdGenerator") @Column(name="CountryId") public Long countryId;
@Column(name="Name", length=128, nullable=false) public String name;
...... }
AccessType.PROPERTY: The EJB persistence implementation will load state into your class via JavaBean "setter" methods, and retrieve state from your class using JavaBean "getter" methods. This is the default. --> 通过getter和setter方法访问Entity的变量,可以把变量定义为private; --> 需要在getter方法上定义字段的属性; AccessType.FIELD: State is loaded and retrieved directly from your class' fields. You do not have to write JavaBean "getters" and "setters". --> 直接访问Entity的变量,可以不定义getter和setter方法,但是需要将变量定义为public; --> 需要在变量上定义字段的属性;
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