对于我正在处理的项目,我需要查询 Nhibernate 中映射字典的值。就像是
SELECT * FROM EntityWithDictionary WHERE EntityWithDictionary
in (select EntityFromDictionaryId FROM Dictionary where value = 'testvalue')
我已经尝试了几件事,但我无法弄清楚我该怎么做。这就是我所拥有的。
实体
public class EntityWithDictionary
{
public virtual Guid Id { get; set; }
public virtual string Description { get; set; }
private IDictionary<string, string> _dictionary = new Dictionary<string, string>();
public virtual IDictionary<string, string> Dictionary
{
get { return _dictionary; }
}
}
它在 EntityWithDictionary.Dictionary 中,我想调查这些值。
映射:
public EntityWithDictionaryMap()
{
Id(s => s.Id);
Map(s => s.Description);
HasMany(m => m.Dictionary)
.Table("`Dictionary`")
.KeyColumn("EntityWithDictionaryId")
.AsMap<string>("`Key`")
.Element("`Value`")
.LazyLoad()
.Access.CamelCaseField(Prefix.Underscore)
.Cascade.All();
}
这是我迄今为止尝试过的:
查询查询:
EntityWithDictionary entityWithDictionary = null;
var result = session.QueryOver<EntityWithDictionary>(() =>entityWithDictionary)
.JoinQueryOver(dictionary =>dictionary.Dictionary)
.UnderlyingCriteria.Add(Restrictions.Eq("elements", "test")).List();
这导致以下 sql 语句 =>
SELECT this_.Id as Id0_0_, this_.Description as Descript2_0_0_ FROM
[EntityWithDictionary] this_ inner join [Dictionary] dictionary3_ on
this_.Id=dictionary3_.EntityWithDictionaryId WHERE dictionary1_.[Value] = @p0 ]
在这个查询中,NHibernate 选择使用 2 个别名(dictionary1_,dictionary3_),其中只创建了 1 个(dictionary3_)。
标准
ICriteria criteria = session.CreateCriteria<EntityWithDictionary>();
criteria("Dictionary").Add(Restrictions.Eq("elements", "testValue"));
var result = criteria.List();
这会生成与 queryover 相同的 sql 查询,但问题与结果相同。
我知道这在 hql 中是可能的,但是我如何使用 ICriteria 的 QueryOver 来做到这一点?
from EntityWithDictionaryId e where 'aDictionaryValue' in elements(m.Dictionary).