Java hibernate如何设置“条件”关联的提取模式？
要设置关联的提取模式，我们可以调用Criteria的setFetchMode()方法。我们可以使用FetchMode.SELECT或FetchMode.JOIN。
package org.nhooo.example.hibernate.criteria;
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.Restrictions;
import org.nhooo.example.hibernate.model.Record;
import java.util.List;
public class FetchModeDemo {
public static Session getSession() throws HibernateException {
String cfg = "hibernate.cfg.xml";
SessionFactory sessionFactory = new Configuration().configure(cfg)
.buildSessionFactory();
return sessionFactory.openSession();
}
@SuppressWarnings("unchecked")
public static void main(String[] args) {
try (Session session = getSession()) {
Criteria criteria = session.createCriteria(Record.class)
.setFetchMode("artist", FetchMode.SELECT)
.setFetchMode("label", FetchMode.SELECT)
.add(Restrictions.eq("title", "Please Please Me"));
List<Record> records = criteria.list();
for (Record record : records) {
System.out.println("Recording = "
+ record.getTitle());
System.out.println("Artist = "
+ record.getArtist().getName());
}
}
}
}
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