[1]表结构
  CREATE TABLE "POI_BEIJING"."XML_TEST"
   ( 
    "ITEM_ID" NUMBER(10,0) NOT NULL ENABLE,
    "ITEM_NAME" VARCHAR2(255 BYTE),
    "ITEM_VALUE" "SYS"."XMLTYPE" ,
    }
[2]自定义类型（参考网上资料）
参考了此老兄的思路http://blog.csdn.net/wmbb/archive/2006/08/10/1045742.aspx
package com.csc.poimanager.dao.type;
import java.io.Serializable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import oracle.jdbc.driver.OracleResultSet;
import oracle.sql.OPAQUE;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;
public class PoiAdditionalXmlType implements UserType, Serializable {
    private static final Class returnedClass = String.class;
    private static final int[] SQL_TYPES = new int[] { oracle.xdb.XMLType._SQL_TYPECODE };
    public int[] sqlTypes() {
        return SQL_TYPES;
    }
    public Class returnedClass() {
        return returnedClass;
    }
    public boolean equals(Object arg0, Object arg1) throws HibernateException {
        if (arg0 == null || arg1 == null) {
            throw new HibernateException("None of the arguments can be null.");
        }
        if (arg0 instanceof oracle.xdb.XMLType
                && arg1 instanceof oracle.xdb.XMLType) {
            return arg0.equals(arg1);
        }
        return false;
    }
    public int hashCode(Object arg0) throws HibernateException {
        return 0;
    }
    public Object nullSafeGet(ResultSet rs, String[] names, Object arg2)
            throws HibernateException, SQLException {
        OracleResultSet ors = (OracleResultSet) rs;
        OPAQUE op = ors.getOPAQUE(names[0]);
        oracle.xdb.XMLType xt = oracle.xdb.XMLType.createXML(op);
        return xt.getStringVal();
    }
    public void nullSafeSet(PreparedStatement st, Object value, int index)
            throws HibernateException, SQLException {
        Connection conn = st.getConnection();
        OPAQUE aClob = oracle.xdb.XMLType.createXML(conn, (String) value);
        st.setObject(index, aClob);
    }
    public Object deepCopy(Object value) throws HibernateException {
        return value;
    }
    public boolean isMutable() {
        return false;
    }
    public Serializable disassemble(Object arg0) throws HibernateException {
        return null;
    }
    public Object assemble(Serializable arg0, Object arg1)
            throws HibernateException {
        return null;
    }
    public Object replace(Object arg0, Object arg1, Object arg2)
            throws HibernateException {
        return null;
    }
}

[3]POJO
package com.csc.poimanager.dao;
import com.csc.poimanager.dao.type.PoiAdditionalXmlType;
public class XmlTest implements java.io.Serializable {
    private Long itemId;
    private Long poiId;
    private String itemName;
    private String itemValue;
    public XmlTest() {
    }
    public XmlTest(String itemName) {
        this.itemName = itemName;
    }
    public Long getItemId() {
        return this.itemId;
    }
    public void setItemId(Long itemId) {
        this.itemId = itemId;
    }
    public Long getPoiId() {
        return this.poiId;
    }
    public void setPoiId(Long poiId) {
        this.poiId = poiId;
    }
    public String getItemName() {
        return this.itemName;
    }
    public void setItemName(String itemName) {
        this.itemName = itemName;
    }
    public String getItemValue() {
        return this.itemValue;
    }
    public void setItemValue(String itemValue) {
        this.itemValue = itemValue;
    }
}

[4]映射文件
<?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 Persistence Tools
-->
<hibernate-mapping>
    <class name="com.csc.poimanager.dao.XmlTest" table="XML_TEST">

        <id name="itemId" type="java.lang.Long">
            <column name="ITEM_ID" precision="10" scale="0" />
            <generator class="increment" />
        </id>

        <property name="poiId" type="java.lang.Long">
            <column name="POI_ID" precision="10" scale="0" />
        </property>

        <property name="itemName" type="java.lang.String">
            <column name="ITEM_NAME" />
        </property>         

        <property name="itemValue" type="com.csc.poimanager.dao.type.PoiAdditionalXmlType" >
            <column name="ITEM_VALUE" />
        </property>

    </class>
</hibernate-mapping>

[5]查询操作
        XmlTestDAO xtdao = new XmlTestDAO();
        Session sess = xtdao.getSession();
        Transaction tx = sess.beginTransaction();
       
        XmlTest xt =xtdao.findById((long)1);
       
//        xtdao.save(xt);
       
        System.out.println("xt item_value : " + xt.getItemName());
        System.out.println("xt item_value : " + xt.getItemValue());
       
       
        tx.commit();
        sess.close();
       
        System.out.println("getting xmltest ok ");
   执行结果
        xt item_value : WIFI
        xt item_value : <?xml version="1.0"?>
                                <wifi>Yes</wifi>
        getting xmltest ok


[6]插入操作
           XmlTestDAO xtdao = new XmlTestDAO();
        Session sess = xtdao.getSession();
        Transaction tx = sess.beginTransaction();
      
        XmlTest xt =xtdao.findById((long)1);
        System.out.println("xt item_value : " + xt.getItemName());
        System.out.println("xt item_value : " + xt.getItemValue());
        tx.commit();
        sess.close();
        System.out.println("getting xmltest ok ");
    执行结果：
    saving xmltest ok    

[8]注意
   (1)oracle的XmlType不是字符串，是oracle的一种数据类型，就像varchar一样
   (2)POJO中的itemValue类型是由你的自定义类解析后的对象类型
      比如上面的实现，是把XmlType对象解析成xml的串，是字符串类型。所以在POJO中的定义是String类型，而不是PoiAdditionalXmlTyp类型
   (3)此处仅实现了把oracle中XmlType的值解析成string串，同时，可以把xml的string串保存到XmlType类型的字段里面


  


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