从JDK5.0开始，Sun引进了一个全新的关键字 enum 来定义一个枚举类型，于是 JPA 中也有相应的注解来对枚举类型进行映射。
假设顾客表如下：
CREATE TABLE `customer` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(100) DEFAULT NULL,
`state` varchar(10) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `ak_key_2` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
相应的实体类如下：
@Entity
@Table(name = “CUSTOMER”, uniqueConstraints = @UniqueConstraint(columnNames = “name”))
public class Customer extends AuditableEntity {
private String name;//顾客名称
private StateEnum state;//状态
@Column(name = “name”, unique = true, length = 100)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@Column(name = “state”, length = 10)
@Enumerated(EnumType.STRING)
public StateEnum getState() {
return state;
}
public void setState(StateEnum state) {
this.state = state;
}
public static enum StateEnum {
NORMAL, DELETE;
public String getLabel() {
switch (this) {
case NORMAL:
return “正常”;
case DELETE:
return “删除”;
}
return super.toString();
}
}
}
说明：
EnumType有两个值，ORDINAL表示持久化的为枚举类型的值，STRING表示持久化的为枚举类型的名称。
@Enumerated注解的API文档说明：
http://docs.oracle.com/javaee/5/api/javax/persistence/Enumerated.html
EnumType注解的API文档说明：
http://docs.oracle.com/javaee/5/api/javax/persistence/EnumType.html
参考文档：
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