我的代码是这样的:我想在两个表中选择数据
// ArrayList<DetailType> list = null;
SessionFactory sf = null;
Session ses = null;
try {
Configuration cfg = new Configuration().configure();
ServiceRegistry sr = new ServiceRegistryBuilder().applySettings(
cfg.getProperties()).buildServiceRegistry();
sf = cfg.buildSessionFactory(sr);
ses = sf.openSession();
// 执行查询语句
String hql = "select new DetailVoMain(d.d_id,d.d_name,m.m_name)"
+ "from MainType m, DetailType d "
+ "where d.d_main_id = m.m_id";
Query query = ses.createQuery(hql);
List<?> list = query.list();
for (int i = 0; i < list.size(); i++) {
DetailVoMain detailType = (DetailVoMain) list.get(i);
System.out.println("dId-------->" + detailType.getdId());
System.out.println("dNam-------->" + detailType.getdName());
System.out.println("mNam-------->" + detailType.getmName());
}
} catch (HibernateException e) {
System.out.println("hibernate exception");
e.printStackTrace();
} finally {
ses.close();
sf.close();
}
和 myeclipese 给我错误信息:
hibernate exception
org.hibernate.QueryException: 无法解析属性: d_id of: com.xunfang.em_mallServer.bean.DetailType [select new DetailVoMain(d.d_id,d.d_name,m.m_name)from com.xunfang.em_mallServer.bean.MainType m, com.xunfang.em_mallServer.bean.DetailType d where d.d_main_id = m.m_id] at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:83) at org.hibernate.persister.entity.AbstractPropertyMapping .toType(AbstractPropertyMapping.java:77) 在 org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1968) 在 org.hibernate.hql.internal.ast.tree.FromElementType.getPropertyType(FromElementType.java:313 ) 在 org.hibernate.hql.internal.ast.tree.DotNode 的 org.hibernate.hql.internal.ast.tree.FromElement.getPropertyType(FromElement.java:490)。getDataType(DotNode.java:616) at org.hibernate.hql.internal.ast.tree.DotNode.prepareLhs(DotNode.java:267) at org.hibernate.hql.internal.ast.tree.DotNode.resolve(DotNode. java:214) 在 org.hibernate.hql.internal.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:119) 在 org.hibernate.hql.internal.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:115)在 org.hibernate.hql.internal.ast.tree.DotNode.resolveSelectExpression(DotNode.java:678) 在 org.hibernate.hql.internal.ast.HqlSqlWalker.resolveSelectExpression(HqlSqlWalker.java:893) 在 org.hibernate.hql .internal.antlr.HqlSqlBaseWalker.selectExpr(HqlSqlBaseWalker.java:2208) 在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.constructor(HqlSqlBaseWalker.java:2502) 在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectExpr (HqlSqlBaseWalker.java:第2275章.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:571) 在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:299) 在 org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement (HqlSqlBaseWalker.java:247) 在 org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:249) 在 org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:184) 在org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:137) 在 org.hibernate.engine.query.spi.HQLQueryPlan.(HQLQueryPlan.java:105) 在 org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:168) 在 org.hibernate.internal 的 org.hibernate.engine.query.spi.HQLQueryPlan.(HQLQueryPlan.java:80)。 AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:221) at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:199) at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1778) at com.xunfang.em_mallServer .util.Test.main(Test.java:39)hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1778) 在 com.xunfang.em_mallServer.util.Test.main(Test.java:39)hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1778) 在 com.xunfang.em_mallServer.util.Test.main(Test.java:39)
请帮帮我,我通宵测试!
我的 MainType 实体是这样的:
public class MainType {
private String mId; // 编号
private String mName; // 类别名称
public String getmId() {
return mId;
}
public void setmId(String mId) {
this.mId = mId;
}
public String getmName() {
return mName;
}
和这样的映射:
<hibernate-mapping package="com.xunfang.em_mallServer.bean">
<class name="MainType" table="t_main_type"> <!-- 设置表名和字段对应数据 -->
<id name="mId" column="m_id" type="string">
</id>
<property name="mName" column="m_name" type="string"></property>
</class>
DetailType 实体如下:
public class DetailType {
/**
* 小类编号
*/
private String dId;
/**
* 小类名称
*/
private String dName;
/**
* 归属大类编号
*/
private String dMainId;
public String getdId() {
return dId;
}
public void setdId(String dId) {
this.dId = dId;
}
public String getdName() {
return dName;
}
public void setdName(String dName) {
this.dName = dName;
}
public String getdMainId() {
return dMainId;
}
public void setdMainId(String dMainId) {
this.dMainId = dMainId;
}
和映射:
<hibernate-mapping package="com.xunfang.em_mallServer.bean">
<class name="DetailType" table="t_detail_type"> <!-- 设置表名和字段对应数据 -->
<id name="dId" column="d_id" type="string">
</id>
<property name="dName" column="d_name" type="string"></property>
<property name="dMainId" column="d_main_id" type="string"></property>
</class>
谢谢你帮助我!