java我们可以在Hibernate上持久化内部枚举吗?
我在类“User”中创建了一个内部枚举“UserType”,用于确定用户的实例是基本用户、部门用户、独占用户还是超级用户。下面是一段代码:
public class User {
private String id, lastName, firstName, middleName, password;
private UserType userType;
public void setId(String id) {
this.id = id;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public void setMiddleName(String middleName) {
this.middleName = middleName;
}
public void setPassword(String password) {
this.password = Encryption.encrypt(password);
}
public void setUserType(UserType userType) {
this.userType = userType;
}
public String getId() {
return id;
}
public String getLastName() {
return lastName;
}
public String getFirstName() {
return firstName;
}
public String getMiddleName() {
return middleName;
}
public String getPassword() {
return password;
}
public UserType getUserType() {
return userType;
}
public enum UserType {
BASIC, DEPARTMENT_HEAD, SUPERUSER;
}
}
现在,我想使用ORM将实例化的对象保存到我的MySQL数据库中。我正在使用Hibernate。下面是我在类标记中的Hibernate映射文件片段:
<id name="id" type="string" column="id"/>
<property name="lastName" column="lastName" type="string" not-null="true"/>
<property name="firstName" column="firstName" type="string"/>
<property name="middleName" column="middleName" type="string"/>
<property name="password" column="password" type="string" not-null="true"/>
<property name="userType" column="userType" not-null="true">
<type name="org.hibernate.type.EnumType">
<param name="enumClass">com.fileManagement.dataDesign.User.UserType</param>
<param name="type">12</param>
<param name="useNamed">true</param>
</type>
</property>
我运行了一些测试,抛出了一个异常,告知找不到枚举。以下是测试代码:
SessionFactory f = HibernateUtil.getSessionFactory();
Session s = f.openSession();
Transaction t = s.beginTransaction();
User user = new User();
user.setId("0090713");
user.setLastName("Nocos");
user.setFirstName("Warren");
user.setMiddleName("Manlangit");
user.setPassword("wang1234");
user.setUserType(UserType.DEPARTMENT_HEAD);
s.save(user);
t.commit();
s.close();
f.close();
下面是异常堆栈跟踪的片段:
Caused by: org.hibernate.HibernateException: Enum class not found
at org.hibernate.type.EnumType.setParameterValues(EnumType.java:244)
at org.hibernate.type.TypeFactory.injectParameters(TypeFactory.java:131)
at org.hibernate.type.TypeFactory.custom(TypeFactory.java:214)
... 12 more
Caused by: java.lang.ClassNotFoundException: com.fileManagement.dataDesign.User.UserType
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:340)
at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:171)
at org.hibernate.type.EnumType.setParameterValues(EnumType.java:241)
... 14 more
我尝试将枚举作为一个外部枚举,它工作得很好,但由于设计的选择,我真的想将它作为一个内部枚举放在“User”类中,因为它只在该类上可用。有可能这样做吗?如果是,如何进行
# 1 楼答案
声明我的类中提到的映射为:
com.fileManagement.dataDesign.User$UserType
通常,如果我们想访问Hibernate中的任何内部类,那么我们需要使用
$
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