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AccessType用來定義訪問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.
--> 通過getter和setter方法訪問Entity的變量，可以把變量定義為private；
--> 需要在getter方法上定義字段的屬性； AccessType.FIELD: State is loaded and retrieved directly from your class' fields. You do not have to write JavaBean "getters" and "setters".
--> 直接訪問Entity的變量，可以不定義getter和setter方法，但是需要將變量定義為public；
--> 需要在變量上定義字段的屬性；
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