java-复合PK字段上的分离标准?
作者:互联网
我有一个包含3列作为主键的表.代码和映射如下:
复合键的类
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
}
表的类
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
}
休眠xml映射
<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>
所有这些都很好.现在,我需要编写DetachedCriteria查询以获取特定的ResultCurrentState对象/记录.我尝试了类似的方法,但是它不起作用(我不知道是否将此复合ID视为嵌套属性):
//...
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));
如果有人可以帮助我编写适当的标准,我将不胜感激.
谢谢.
解决方法:
至于使用复合主键的条件,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,由于已在类ResultCurrentState中使用该名称在POJO中声明了组合键,因此将ID用作前缀:
private CIDResultCurrentState ID;
至于查询执行,我认为是这样的(我的是不同的-不一定更好):
return (ResultCurrentState)DataAccessUtils.uniqueResult(getHibernateTemplate().findByCriteria(criteria));
使用我的看起来像这样:
List<ResultCurrentState> result = DataAccessUtils.find(criteria);
标签:hibernate,hibernate-criteria,detachedcriteria,java 来源: https://codeday.me/bug/20191208/2087872.html