Question

当我尝试执行连接查询时，我收到以下错误

("could not resolve property: Countries of: com.fexco.helloworld.web.model.Customer [select cus from com.fexco.helloworld.web.model.Customer as cus join cus.Countries as cou where cus.id = cou.id]")

我正在尝试通过公共ID

加入Customer和Countries表

Customer.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.ccg.db.test">
<class name="Customer" table="Customer">
    <id name="id" column="id" type="bigiint">
        <generator class="native"/>
    </id>
    <property name="firstname" type="string" >
       <column name="firstname" /> 
    </property>
    <property name="surname" type="string" >
        <column name="surname" /> 
    </property>
    <property name="address1" type="string" >
        <column name="address1" /> 
    </property>
    <property name="address2" type="string" >
        <column name="address2" /> 
    </property>
    <many-to-one name="Countries" column="id" class="Countries" /> 
</class>
</hibernate-mapping>

Countries.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.ccg.db.test">
<!-- CLASS NAME MIGHT BE CUSTOMER -->
<class name="Countries" table="Countries">
    <id name="id" column="id">
        <generator class="native" />
    </id>
    <property name="country" column="country" />
</class>
</hibernate-mapping>

这是我试图打电话的查询

String sql_query = "select cus from Customer as cus join cus.Countries as cou where cus.id = cou.id";

我是HQL的新手，所以不确定它的所有内容，那么有人知道如何解决这个问题吗？

由于

Answer 1

这是cus.countries，而不是cus.Countries。属性名称区分大小写。

Answer 2

试

select cus from Customer cus  where cus.id = cus.countries.id

HQL JOIN QUERY：无法解析属性：

2 个答案: