跨多个表的NHibernate查询 [英] NHibernate Query across multiple tables
问题描述
我正在使用NHibernate,并试图弄清楚如何编写查询,该查询搜索我实体的所有名称, 并列出结果.作为一个简单的例子,我有以下对象;
I am using NHibernate, and am trying to figure out how to write a query, that searchs all the names of my entities, and lists the results. As a simple example, I have the following objects;
public class Cat {
public string name {get; set;}
}
public class Dog {
public string name {get; set;}
}
public class Owner {
public string firstname {get; set;}
public string lastname {get; set;}
}
最终,我想创建一个查询,例如,该查询返回所有名称包含"ted"的宠物主人,或返回名称包含"ted"的宠物.
Eventaully I want to create a query , say for example, which and returns all the pet owners with an name containing "ted", OR pets with a name containing "ted".
这是我要执行的SQL的示例:
Here is an example of the SQL I want to execute:
SELECT TOP 10 d.*, c.*, o.* FROM owners AS o
INNER JOIN dogs AS d ON o.id = d.ownerId
INNER JOIN cats AS c ON o.id = c.ownerId
WHERE o.lastname like '%ted%'
OR o.firstname like '%ted%'
OR c.name like '%ted%'
OR d.name like '%ted%'
当我使用这样的条件进行操作时:
When I do it using Criteria like this:
var criteria = session.CreateCriteria<Owner>()
.Add(
Restrictions.Disjunction()
.Add(Restrictions.Like("FirstName", keyword, MatchMode.Anywhere))
.Add(Restrictions.Like("LastName", keyword, MatchMode.Anywhere))
)
.CreateCriteria("Dog").Add(Restrictions.Like("Name", keyword, MatchMode.Anywhere))
.CreateCriteria("Cat").Add(Restrictions.Like("Name", keyword, MatchMode.Anywhere));
return criteria.List<Owner>();
将生成以下查询:
SELECT TOP 10 d.*, c.*, o.* FROM owners AS o
INNER JOIN dogs AS d ON o.id = d.ownerId
INNER JOIN cats AS c ON o.id = c.ownerId
WHERE o.lastname like '%ted%'
OR o.firstname like '%ted%'
AND d.name like '%ted%'
AND c.name like '%ted%'
如何调整查询,以便.CreateCriteria("Dog")和.CreateCriteria("Cat")生成OR(而不是AND)?
How can I adjust my query so that the .CreateCriteria("Dog") and .CreateCriteria("Cat") generate an OR instead of the AND?
感谢您的帮助.
推荐答案
尝试一下,它可能会起作用.
Try this, it might work.
var criteria = session.CreateCriteria<Owner>()
.CreateAlias("Dog", "d")
.CreateAlias("Cat", "c")
.Add(
Restrictions.Disjunction()
.Add(Restrictions.Like("FirstName", keyword, MatchMode.Anywhere))
.Add(Restrictions.Like("LastName", keyword, MatchMode.Anywhere))
.Add(Restrictions.Like("c.Name", keyword, MatchMode.Anywhere))
.Add(Restrictions.Like("d.Name", keyword, MatchMode.Anywhere))
);
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