组合PK字段的分离标准?
我有一个3列作为主键的表。 代码和映射如下:
组合键的类
public class CIDResultCurrentState implements Serializable
{
private static final long serialVersionUID = -4346801004559840730L;
private String mID = "";
private String sNo = "";
private String date = "";
// getters, setters, equals(), hashCode() omitted for brevity
}
班级
public class ResultCurrentState implements IBaseModel, Serializable
{
private static final long serialVersionUID = 5707101766665188676L;
private CIDResultCurrentState ID;
private byte[] rData;
private byte[] pData;
// getters, setters, equals(), hashCode() omitted for brevity
}
hibernate的xml地图
<hibernate-mapping>
<class name="org.irvas.amrregina.backend.model.ResultCurrentState" table="RESULT_CURRENT_STATE">
<composite-id name="ID" class="org.irvas.amrregina.backend.model.CIDResultCurrentState">
<key-property name="mID" column="M_ID" type="java.lang.String"/>
<key-property name="sNo" column="S_NO" type="java.lang.String"/>
<key-property name="date" column="S_DATE" type="java.lang.String"/>
</composite-id>
<property name="rData" column="R_DATA" not-null="false" type="binary"/>
<property name="pData" column="P_DATA" not-null="false" type="binary"/>
</class>
</hibernate-mapping>
所有这些工作正常。 现在,我需要编写DetachedCriteria查询来获取特定的ResultCurrentState对象/记录。 我尝试了这样的东西,但它不起作用(我不知道是否将此复合ID作为嵌套属性处理):
//...
DetachedCriteria criteria = DetachedCriteria.forClass(ResultCurrentState.class);
DetachedCriteria criteriaID = criteria.createCriteria("ID");
criteriaID.add(Restrictions.eq("mID", arg.getType().getMID()));
criteriaID.add(Restrictions.eq("sNo", arg.getSN()));
criteriaID.add(Restrictions.eq("date", date));
return (ResultCurrentState)DataAccessUtils.uniqueResult(getHibernateTemplate().findByCriteria(criteriaID));
如果有人能帮我写出适当的标准,我真的很感激它。
谢谢。
Criteria criteria = session.forClass(ResultCurrentState.class);
DetachedCriteria criteriaID = DetachedCriteria.forClass(CIDResultCurrentState.class);
criteriaID.add(Restrictions.eq("mID", arg.getType().getMID()));
criteriaID.add(Restrictions.eq("sNo", arg.getSN()));
criteriaID.add(Restrictions.eq("date", date));
criteria.add(Subqueries.propertyIn("ID", criteriaID));
return criteria.list();
至于使用复合主键的标准,这应该足够了:
DetachedCriteria criteria = DetachedCriteria.forClass(ResultCurrentState.class);
criteria.add(Restrictions.eq("ID.mID", arg.getType().getMID()));
criteria.add(Restrictions.eq("ID.sNo", arg.getSN()));
criteria.add(Restrictions.eq("ID.date", date));
请注意,由于您已在类ResultCurrentState
使用该名称在POJO中声明组合键,因此将ID
用作前缀:
private CIDResultCurrentState ID;
至于查询执行,我认为它是这样的(我的不同 - 不一定更好):
return (ResultCurrentState)DataAccessUtils.uniqueResult(getHibernateTemplate().findByCriteria(criteria));
使用我的会看起来像这样:
List<ResultCurrentState> result = DataAccessUtils.find(criteria);
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