Hibernate对自定义类型UserType的用法
2015-03-13 19:45
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Hibernate允许我们自定义映射属性的类型,比如一个学生有联系地址,而联系地址又分为家庭地址和工作地址,我们可以把两个地址信息抽象成一个新的Address类,作为Student的成员变量
数据库结构:
create table typestu (id varchar(32) primary key,name varchar(32),homeaddr varchar(32),workaddr varchar(32));
Hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
<property name="connection.username">root</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312&useUnicode=true
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="myeclipse.connection.profile">mysql</property>
<property name="connection.password">1234</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.show_sql">true</property>
<property name="current_session_context_class">thread</property>
<mapping resource="Search/UserType/Student.hbm.xml" />
</session-factory>
</hibernate-configuration>
Pojo
package Search.UserType;
public class Student {
private String id; //标识id
private String name; //学生姓名
private AddressType address;//地址
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public AddressType getAddress() {
return address;
}
public void setAddress(AddressType address) {
this.address = address;
}
}
自定义类型
package Search.UserType;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;
public class AddressType implements UserType, Serializable {
private String homeAddr;
private String workAddr;
/* 有几个字段就有几个值,这里容易出错,要多注意 */
private static final int[] SQL_TYPES = { Types.VARCHAR, Types.VARCHAR };
/* 这个方法告诉Hibernate在成生DDL时对列采用什么样的SQL语法 */
public int[] sqlTypes() {
return SQL_TYPES;
}
/*
* Hibernate返回什么样的映射类型,与 <property name="address" type="model.AddressType">
* 指定的类一致。事实上也可以把AddressType拆分为两个类,一个类是只携带信息的JavaBean,它里面
* 没有逻辑操作也没有实现UserType(比如AddressBean);而另一个类实现了UserType,它所面对的就不是现在这个
* AddressType类的homeAddr和homeAddr属性,它面对的是AddressBean。在本例中为了简洁方便,只用了一个类。
*/
public Class returnedClass() {
return AddressType.class;
}
/*
* 表明这个类的实例在创建以后就不可以改变属性。Hibernate能为不可改变的类作一些性能优化。
*/
public boolean isMutable() {
return false;
}
/*
* 由于AddressType是不可变的,所以深拷贝可以直接返回对象引用。拷贝的对象由应用程序使用, 而原版对象由Hibernate维护以做脏数据检查
*/
public Object deepCopy(Object value) {
return value; // Address is immutable
}
/* 两个对象是否相等,使用了apache的common工具包来进行属性比对 */
public boolean equals(Object x, Object y) {
if (x == y)
return true;
if (x == null || y == null)
return false;
AddressType add1 = (AddressType) x;
AddressType add2 = (AddressType) y;
return new EqualsBuilder() //使用EqualsBuilder类来方便地进行比对
.append(add1.getHomeAddr(), add2.getHomeAddr()).append(
add2.getWorkAddr(), add2.getWorkAddr()).isEquals();
}
/* 得到hash码 */
public int hashCode(Object x) throws HibernateException {
AddressType address = (AddressType) x;
return new HashCodeBuilder()//使用HashCodeBuilder类来方便地进行比对
.append(address.getHomeAddr()).append(address.getWorkAddr())
.toHashCode();
}
/* 读取数据并组装成一个AddressType对象。names[]中的参数顺序依照映射文件中定义的顺序 */
public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
throws HibernateException, SQLException {
if (rs.wasNull())
return null;
String homeAddr = rs.getString(names[0]);
String schoolAddr = rs.getString(names[1]);
AddressType address = new AddressType(homeAddr, schoolAddr);
return address;
}
/* 保存数据,index的顺序按照映射文件定义的顺序,从0开始。 */
public void nullSafeSet(PreparedStatement st, Object value, int index)
throws HibernateException, SQLException {
AddressType address = (AddressType) value;
if (value == null) {
st.setNull(index, Types.VARCHAR);
st.setNull(index+1, Types.VARCHAR);
} else {
st.setString(index, address.getHomeAddr());
st.setString(index + 1, address.getWorkAddr());
}
System.out.println("Data has been saved! ");
}
/* 当把AddressType类型数据写入二级缓存时,此方法被调用 */
public Serializable disassemble(Object value) throws HibernateException {
return null;
}
/* 当从二级缓存中读取AddressType类型数据时,此方法被调用 */
public Object assemble(Serializable cached, Object owner)
throws HibernateException {
// TODO 自动生成方法存根
return null;
}
public Object replace(Object original, Object target, Object owner)
throws HibernateException {
// TODO 自动生成方法存根
return null;
}
public AddressType() {
super();
}
public AddressType(String homeAddr, String workAddr) {
super();
this.homeAddr = homeAddr;
this.workAddr = workAddr;
}
/**
* @return 返回 sQL_TYPES。
*/
public static int[] getSQL_TYPES() {
return SQL_TYPES;
}
/**
* @return 返回 homeAddr。
*/
public String getHomeAddr() {
return homeAddr;
}
/**
* @param homeAddr
* 要设置的 homeAddr。
*/
private void setHomeAddr(String homeAddr) {
this.homeAddr = homeAddr;
}
private String getWorkAddr() {
return workAddr;
}
private void setWorkAddr(String workAddr) {
this.workAddr = workAddr;
}
}
Student.hbm.xml
<?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">
<!--
Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
<class name="Search.UserType.Student" table="typestu" lazy="false">
<id name="id" unsaved-value="null" type="string" column="id">
<generator class="uuid.hex" />
</id>
<property name="name" type="string" />
<property name="address" type="Search.UserType.AddressType">
<column name="homeaddr"/>
<column name="workaddr"/>
</property>
</class>
</hibernate-mapping>
测试代码:
package Search.UserType;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Blob;
import java.sql.Clob;
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class Test {
public static void main(String[] args) {
String filePath=System.getProperty("user.dir")+File.separator+"src/Search/UserType"+File.separator+"hibernate.cfg.xml";
File file=new File(filePath);
SessionFactory sessionFactory=new Configuration().configure(file).buildSessionFactory();
Session session=sessionFactory.openSession();
Transaction tx=session.beginTransaction();
AddressType address=new AddressType("home","work");
Student stu=new Student();
stu.setName("tome1");
stu.setAddress(address);
session.save(stu);
tx.commit();
}
}
数据库结构:
create table typestu (id varchar(32) primary key,name varchar(32),homeaddr varchar(32),workaddr varchar(32));
Hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
<property name="connection.username">root</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312&useUnicode=true
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="myeclipse.connection.profile">mysql</property>
<property name="connection.password">1234</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.show_sql">true</property>
<property name="current_session_context_class">thread</property>
<mapping resource="Search/UserType/Student.hbm.xml" />
</session-factory>
</hibernate-configuration>
Pojo
package Search.UserType;
public class Student {
private String id; //标识id
private String name; //学生姓名
private AddressType address;//地址
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public AddressType getAddress() {
return address;
}
public void setAddress(AddressType address) {
this.address = address;
}
}
自定义类型
package Search.UserType;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;
public class AddressType implements UserType, Serializable {
private String homeAddr;
private String workAddr;
/* 有几个字段就有几个值,这里容易出错,要多注意 */
private static final int[] SQL_TYPES = { Types.VARCHAR, Types.VARCHAR };
/* 这个方法告诉Hibernate在成生DDL时对列采用什么样的SQL语法 */
public int[] sqlTypes() {
return SQL_TYPES;
}
/*
* Hibernate返回什么样的映射类型,与 <property name="address" type="model.AddressType">
* 指定的类一致。事实上也可以把AddressType拆分为两个类,一个类是只携带信息的JavaBean,它里面
* 没有逻辑操作也没有实现UserType(比如AddressBean);而另一个类实现了UserType,它所面对的就不是现在这个
* AddressType类的homeAddr和homeAddr属性,它面对的是AddressBean。在本例中为了简洁方便,只用了一个类。
*/
public Class returnedClass() {
return AddressType.class;
}
/*
* 表明这个类的实例在创建以后就不可以改变属性。Hibernate能为不可改变的类作一些性能优化。
*/
public boolean isMutable() {
return false;
}
/*
* 由于AddressType是不可变的,所以深拷贝可以直接返回对象引用。拷贝的对象由应用程序使用, 而原版对象由Hibernate维护以做脏数据检查
*/
public Object deepCopy(Object value) {
return value; // Address is immutable
}
/* 两个对象是否相等,使用了apache的common工具包来进行属性比对 */
public boolean equals(Object x, Object y) {
if (x == y)
return true;
if (x == null || y == null)
return false;
AddressType add1 = (AddressType) x;
AddressType add2 = (AddressType) y;
return new EqualsBuilder() //使用EqualsBuilder类来方便地进行比对
.append(add1.getHomeAddr(), add2.getHomeAddr()).append(
add2.getWorkAddr(), add2.getWorkAddr()).isEquals();
}
/* 得到hash码 */
public int hashCode(Object x) throws HibernateException {
AddressType address = (AddressType) x;
return new HashCodeBuilder()//使用HashCodeBuilder类来方便地进行比对
.append(address.getHomeAddr()).append(address.getWorkAddr())
.toHashCode();
}
/* 读取数据并组装成一个AddressType对象。names[]中的参数顺序依照映射文件中定义的顺序 */
public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
throws HibernateException, SQLException {
if (rs.wasNull())
return null;
String homeAddr = rs.getString(names[0]);
String schoolAddr = rs.getString(names[1]);
AddressType address = new AddressType(homeAddr, schoolAddr);
return address;
}
/* 保存数据,index的顺序按照映射文件定义的顺序,从0开始。 */
public void nullSafeSet(PreparedStatement st, Object value, int index)
throws HibernateException, SQLException {
AddressType address = (AddressType) value;
if (value == null) {
st.setNull(index, Types.VARCHAR);
st.setNull(index+1, Types.VARCHAR);
} else {
st.setString(index, address.getHomeAddr());
st.setString(index + 1, address.getWorkAddr());
}
System.out.println("Data has been saved! ");
}
/* 当把AddressType类型数据写入二级缓存时,此方法被调用 */
public Serializable disassemble(Object value) throws HibernateException {
return null;
}
/* 当从二级缓存中读取AddressType类型数据时,此方法被调用 */
public Object assemble(Serializable cached, Object owner)
throws HibernateException {
// TODO 自动生成方法存根
return null;
}
public Object replace(Object original, Object target, Object owner)
throws HibernateException {
// TODO 自动生成方法存根
return null;
}
public AddressType() {
super();
}
public AddressType(String homeAddr, String workAddr) {
super();
this.homeAddr = homeAddr;
this.workAddr = workAddr;
}
/**
* @return 返回 sQL_TYPES。
*/
public static int[] getSQL_TYPES() {
return SQL_TYPES;
}
/**
* @return 返回 homeAddr。
*/
public String getHomeAddr() {
return homeAddr;
}
/**
* @param homeAddr
* 要设置的 homeAddr。
*/
private void setHomeAddr(String homeAddr) {
this.homeAddr = homeAddr;
}
private String getWorkAddr() {
return workAddr;
}
private void setWorkAddr(String workAddr) {
this.workAddr = workAddr;
}
}
Student.hbm.xml
<?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">
<!--
Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
<class name="Search.UserType.Student" table="typestu" lazy="false">
<id name="id" unsaved-value="null" type="string" column="id">
<generator class="uuid.hex" />
</id>
<property name="name" type="string" />
<property name="address" type="Search.UserType.AddressType">
<column name="homeaddr"/>
<column name="workaddr"/>
</property>
</class>
</hibernate-mapping>
测试代码:
package Search.UserType;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Blob;
import java.sql.Clob;
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class Test {
public static void main(String[] args) {
String filePath=System.getProperty("user.dir")+File.separator+"src/Search/UserType"+File.separator+"hibernate.cfg.xml";
File file=new File(filePath);
SessionFactory sessionFactory=new Configuration().configure(file).buildSessionFactory();
Session session=sessionFactory.openSession();
Transaction tx=session.beginTransaction();
AddressType address=new AddressType("home","work");
Student stu=new Student();
stu.setName("tome1");
stu.setAddress(address);
session.save(stu);
tx.commit();
}
}
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