1. 性别枚举类型类：Gender.java
/**
*/
package com.qiujy.common.myusertype;
import java.io.Serializable;
/**
* 性别枚举类型
*/
public enum Gender implements Serializable {
Male("男", 0), Female("女", 1), Other("保密", 2);
private String name;
private int value;
public String getName() {
return name;
}
public int getValue() {
return value;
}
private Gender(String name, int value) {
this.name = name;
this.value = value;
}
public static Gender getGender(int value) {
if (0 == value){
return Male;
}else if (1 == value){
return Female;
}else{
return Other;
}
}
@Override
public String toString(){
return this.name;
}
}
2.自定义枚举映射类型类：GenderType.java
/**
* Filename: ExportDBScript.java
* Author: examda
* Createtime:Nov 25, 2008
* Copyrights 2008 qjyong All rights reserved.
*/
package com.qiujy.common.myusertype;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;
/**
* 自定义hibernate的性别枚举映射类型
*/
public class GenderType implements UserType {
/** 告诉Hibernate要使用什么SQL列类型生成DDL */
public int[] sqlTypes() {
return new int[]{Hibernate.SHORT.sqlType()};
}
/** 告诉Hibernate这个UserType用来映射的数据类型。这里是Gender类 */
@SuppressWarnings("unchecked")
public Class returnedClass() {
return Gender.class;
}
/** 告诉hibernate这个类型是不可变的。有微小的性能优化 */
public boolean isMutable() {
return false;
}
/**这是用于Hibernate缓存生成的快照，由于Gender是不可变的，直接返回就好了。*/
public Object deepCopy(Object arg0) throws HibernateException {
return arg0;
}
/** hibernate把这个数据放入二级缓存时要调用的方法 */
public Serializable disassemble(Object arg0) throws HibernateException {
return (Serializable)arg0;
}
/** 从二级缓存中取这个对象数据时要调用的方法 */
public Object assemble(Serializable arg0, Object arg1)
throws HibernateException {
return arg0;
}
/** 处理脱管对象状态的合并。*/
public Object replace(Object original, Object target, Object owner)
throws HibernateException {
return original;
}
public boolean equals(Object x, Object y) throws HibernateException {
return x == y;
}
public int hashCode(Object o) throws HibernateException {
return o.hashCode();
}
/** 从JDBC的ResultSet读取属性值。这个方法是在从数据库查询数据时用到。 */
public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
throws HibernateException, SQLException {
int value = rs.getInt(names[0]);
return Gender.getGender(value);
}
/** 将属性的值设置到PreparedStatement。 */
public void nullSafeSet(PreparedStatement ps, Object value, int index)
throws HibernateException, SQLException {
if (value == null) {
ps.setInt(index, Hibernate.SHORT.sqlType());
} else {
ps.setInt(index, ((Gender) value).getValue());
}
}
}
3.在映射文件中使用：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.qiujy.domain.Account" table="account">
<id name="id" column="id">
<generator class="native"/>
</id>
<property name="loginname" column="login_name"/>
<property name="pwd"/>
<property name="gender" type="com.qiujy.common.myusertype.GenderType"/>
<property name="registedTime" type="timestamp" column="registed_time"/>
</class>
</hibernate-mapping>
责任编辑：小草
