我有两个模型,Item和ShopSection.他们有多对多的关系.
@Entity(name = "item")
public class Item extends Model
{
@ManyToMany(cascade = CascadeType.PERSIST)
public Set<ShopSection> sections;
}
@Entity(name = "shop_section")
public class ShopSection extends Model
{
public List<Item> findActiveItems(int page,int length)
{
return Item.find("select distinct i from Item i join i.sections as s where s.id = ?",id).fetch(page,length);
}
}
findActiveItems是在一个部分中查找项目,但是我得到这个错误：
org.hibernate.hql.ast.QuerySyntaxException: Item is not mapped [select distinct i from Item i join i.sections as s where s.id = ?] at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:180) at org.hibernate.hql.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:111) at org.hibernate.hql.ast.tree.FromClause.addFromElement(FromClause.java:93) at org.hibernate.hql.ast.HqlsqlWalker.createFromElement(HqlsqlWalker.java:322) at org.hibernate.hql.antlr.HqlsqlBaseWalker.fromElement(HqlsqlBaseWalker.java:3441) at org.hibernate.hql.antlr.HqlsqlBaseWalker.fromElementList(HqlsqlBaseWalker.java:3325) at org.hibernate.hql.antlr.HqlsqlBaseWalker.fromClause(HqlsqlBaseWalker.java:733) at org.hibernate.hql.antlr.HqlsqlBaseWalker.query(HqlsqlBaseWalker.java:584) at org.hibernate.hql.antlr.HqlsqlBaseWalker.selectStatement(HqlsqlBaseWalker.java:301) at org.hibernate.hql.antlr.HqlsqlBaseWalker.statement(HqlsqlBaseWalker.java:244) at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:254) at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185) at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136) at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101) at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80) at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:124) at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156) at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135) at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1770) at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:272) ... 8 more
我究竟做错了什么？
解决方法
您需要添加如下的@Table注释：
@Entity
@Table(name = "item")
public class Item extends Model
{
@ManyToMany(cascade = CascadeType.PERSIST)
public Set<ShopSection> sections;
}
@Entity
@Table(name = "shop_section")
public class ShopSection extends Model
{
public List<Item> findActiveItems(int page,length);
}
}
