Hibernate对自定义类型CompositeUserType的用法
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使用CompositeUserType和使用UserType一样,但CompositeUserType多了HQL的查询支持,并相对比较复杂,一般使用UserType就足够了
使用UserType参考http://blog.csdn.net/daryl715/archive/2007/12/10/1927502.aspx
下面给出UserType不同的AddressType和测试代码:
package Search.CompositeUserType;
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.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.type.Type;
import org.hibernate.usertype.CompositeUserType;
import org.hibernate.usertype.UserType;
public class AddressType implements CompositeUserType, Serializable ...{
private String homeAddr;
private String workAddr;
/**//*获得属性名数组,属性名可用于进行HQL查询 */
public String[] getPropertyNames() ...{
return new String[] ...{ "homeAddr", "schoolAddr" };
}
/**//*获得对应的属性类型,必须和属性名数组元素的顺序相对应 */
public Type[] getPropertyTypes() ...{
return new Type[] ...{ Hibernate.STRING, Hibernate.STRING };
}
/**//*通过index取得对象的属性值,index从0开始,顺序和配置文件中定义属性的顺序一致 */
public Object getPropertyValue(Object component, int property)
throws HibernateException ...{
AddressType address = (AddressType) component;
if (property == 0)
return address.getHomeAddr();
else
return address.getWorkAddr();
}
/**//*根据index设置对象属性 */
public void setPropertyValue(Object component, int property, Object value)
throws HibernateException ...{
AddressType address = (AddressType) component;
String add_value = (String)value;
if (property == 0)
address.setHomeAddr(add_value);
else
address.setWorkAddr(add_value);
}
/**//*返回对应的映射类*/
public Class returnedClass() ...{
return AddressType.class;
}
/**//* 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) throws HibernateException ...{
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,
SessionImplementor session, 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,
SessionImplementor session) 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! ");
}
/**//*完整拷贝一个对象,而不是直接返回它的引用 */
public Object deepCopy(Object value) throws HibernateException ...{
if (value == null)
return null;
AddressType address = (AddressType) value;
return new AddressType(address.getHomeAddr(), address.getWorkAddr());
}
/**//*设置类可变,可以通过属性的set方法改变属性值*/
public boolean isMutable() ...{
return true;
}
/**//* 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, SessionImplementor session)
throws HibernateException ...{
return (Serializable) deepCopy(value);
}
/**//* 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, SessionImplementor session,
Object owner) throws HibernateException ...{
return deepCopy(cached);
}
public Object replace(Object original, Object target,
SessionImplementor session, Object owner) throws HibernateException ...{
// TODO 自动生成方法存根
return null;
}
/** *//**------------------------构造函数和get、set方法-----------------*/
public AddressType(String homeAddr, String workAddr) ...{
super();
this.homeAddr = homeAddr;
this.workAddr = workAddr;
}
public AddressType() ...{
super();
}
public String getHomeAddr() ...{
return homeAddr;
}
public String getWorkAddr() ...{
return workAddr;
}
public void setWorkAddr(String workAddr) ...{
this.workAddr = workAddr;
}
public void setHomeAddr(String homeAddr) ...{
this.homeAddr = homeAddr;
}
}
测试代码:
package Search.CompositeUserType;
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/CompositeUserType"+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);
//测试CompositeUserType对HQL的支持
Student student=(Student)session.createQuery("from Student s where s.address.homeAddr='home'").uniqueResult();
System.out.println(stu.getAddress().getHomeAddr()+"-"+student.getAddress().getWorkAddr());
tx.commit();
}
}
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/CompositeUserType"+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);
//测试CompositeUserType对HQL的支持
Student student=(Student)session.createQuery("from Student s where s.address.homeAddr='home'").uniqueResult();
System.out.println(stu.getAddress().getHomeAddr()+"-"+student.getAddress().getWorkAddr());
tx.commit();
}
}
运行结果:红色部分为HQL的支持效果
Hibernate: insert into typestu (name, homeaddr, workaddr, id) values (?, ?, ?, ?)
Data has been saved!
Hibernate: select student0_.id as id0_, student0_.name as name0_, student0_.homeaddr as homeaddr0_, student0_.workaddr as workaddr0_ from typestu student0_ where student0_.homeaddr='home'
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