通过 HQL 在 Nhibernate 中选择

Question

我有一些映射：

<class entity-name="Person" table="table1">
<id column="Id" type="long" name="Id"/>
<set name="Address">
<key column="Person_id"/>
<one-to-many class="Address"/>
</set>
<property column="Id" name="Id" type="long"/>
<property column="Last_Name" name="LastName" type="string"/>
<property column="First_Name" name="FirstName" type="string"/>
<property column="Education" name="Education" type="string"/>   
</class>

<class entity-name="Address" table="table2">
<id column="Id" type="long" name="Id"/>
<property column="Id" name="Id" type="long"/>
<property column="City" name="City" type="long"/>
<property column="Street" name="Street" type="string"/>
<property column="number" name="number" type="string"/>
</class>

这是我的 HQL 查询 hbm="from person p join fetch p.Address WHERE p.id in (:ids)"

但现在我从两个表（地址和人）中选择 * 我需要重新定义姓氏、人名和包含 City 、 Street 的 Addresses 集合的 HQL

我如何在地址字段上添加条件？？

Answer 1

添加 Select p 以仅返回 Person。 为 Address 添加别名，以便您可以在 where 子句（条件）中使用它。

select p from person p join fetch p.Address ad WHERE p.id in (:ids) and a.City = :city

Answer 2

这个查询呢？

select p.FirstName, p.LastName, a.City, a.Street from Person p inner join p.Addresses a WHERE p.Id in (:id) and a.City=:city

则结果集合包含对象数组：

var resultList = query.List();
foreach (object[] result in resultList)
{
    Console.WriteLine("Person.FirstName = {0}", result[0]);
    Console.WriteLine("Person.LastName = {0}", result[1]);
    Console.WriteLine("Address.City = {0}", result[2]);
    Console.WriteLine("Address.Street = {0}", result[3]);
}