100分！hibernate关系映射！
one-to-one:由映射文件自动生成数据库，添加数据的时候，不能两个一起添加，相关文件如下：

Idcard.hbm.xml:

<!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.xyy.domain.Idcard">
<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="foreign">
<param name="property">person</param>
</generator>
</id>
<property name="validate" type="java.util.Date">
<column name="validate"/>
</property>
<!-- 配置one-to-one
constrained:不配置，则不会自动生成外键列，配置了，则会生成外键列
 -->
<one-to-one name="person" constrained="true"/>
</class>
</hibernate-mapping>

Person.hbm.xml:

<!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.xyy.domain.Person">
<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="assigned"/>
</id>
<property name="name" type="java.lang.String">
<column name="name"/>
</property>
<!-- 配置one-to-one -->
<one-to-one name="idcard" />
</class>
</hibernate-mapping>

TestMain.java:

Person p1=new Person();
p1.setId(2);
p1.setName("scott1");

Idcard idcard=new Idcard();
idcard.setValidate(new Date());
idcard.setPerson(p1);

session.save(p1);
session.save(idcard);

报错：
org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
Caused by: java.sql.BatchUpdateException: ORA-00928: 缺失 SELECT 关键字
[最优解释]

引用:

用级联呀..
Java code?123456789Person p1=new Person(); p1.setId(2); p1.setName("scott1"); Idcard idcard=new Idcard(); idcard.setValid……

+1
[其他解释]

session.save (p1);
Idcard idcard=new Idcard();
idcard.setValidate(new Date());
idcard.setPerson(p1);
试试这样呢！
p1是临时状态，要先持久化吧！


[其他解释]

引用:

session.save (p1);

Idcard idcard=new Idcard();
idcard.setValidate(new Date());
idcard.setPerson(p1);
试试这样呢！
p1是临时状态，要先持久化吧！

错误还是一样
[其他解释]
用级联呀..

Person p1=new Person();
            p1.setId(2);
            p1.setName("scott1");
             
            Idcard idcard=new Idcard();
            idcard.setValidate(new Date());
            idcard.setPerson(p1);         
            session.save(idcard);

<!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.xyy.domain.Idcard">
        <id name="id" type="java.lang.Integer">
            <column name="ID" />
            <generator class="foreign">
                <param name="property">person</param>
            </generator>
        </id>
        <property name="validate" type="java.util.Date">
            <column name="validate"/>
        </property>
        <!-- 配置one-to-one
        constrained:不配置，则不会自动生成外键列，配置了，则会生成外键列
         -->
        <one-to-one name="person" constrained="true" cascade="save-update"/>
    </class>
</hibernate-mapping>

[其他解释]

引用:

用级联呀..
Java code?123456789Person p1=new Person(); p1.setId(2); p1.setName("scott1"); Idcard idcard=new Idcard(); idcard.setValid……

没有用啊，这种问题一般从哪下手去解决？
[其他解释]
加上级联操作就行了
cascade=save-update