[英]Nhibernate QueryOver how can I make this query use async?
For this new website I want to use async methods in NHibernate. 对于这个新网站,我想在NHibernate中使用异步方法。 I have this simple query using QueryOver API but I can't get this one to work with async.
我有一个使用QueryOver API的简单查询,但是我无法使用异步查询。
It is a simple query with some where clauses that list all businesses. 这是一个简单的查询,其中包含列出所有业务的where子句。 I want 20 of them each time I execute this.
每次执行此操作时,我要20个。
Query: 查询:
BusinessListItem bli = null;
BusinessCategory bc = null;
Category c = null;
BusinessImage bi = null;
Image i = null;
var q = Session.QueryOver<Business>()
.JoinAlias(x => x.Categories, () => bc)
.JoinAlias(() => bc.Category, () => c)
.JoinAlias(x => x.Images, () => bi, JoinType.LeftOuterJoin)
.JoinAlias(() => bi.Image, () => i, JoinType.LeftOuterJoin)
.Where(() => bc.IsMain);
if (!string.IsNullOrEmpty(_name))
q.WhereRestrictionOn(x => x.Name).IsLike($"%{_name}%");
if (!string.IsNullOrEmpty(_streetName))
q.WhereRestrictionOn(x => x.StreetName).IsLike($"%{_streetName}%");
if (_categoryId != null)
q.Where(() => c.Id == _categoryId.Value);
if (_subCategoryIds != null)
q.WhereRestrictionOn(() => c.Id).IsIn(_subCategoryIds);
return q.Select(
Projections.Property<Business>(x => x.Id).WithAlias(() => bli.Id),
Projections.Property<Business>(x => x.Name).WithAlias(() => bli.Name),
Projections.Property("c.Name").WithAlias(() => bli.CategoryName),
Projections.Property("bi.Image").WithAlias(() => bli.Image)
)
.TransformUsing(Transformers.AliasToBean<BusinessListItem>())
.List<BusinessListItem>()
.OrderBy(x => x.Name)
.Skip(_skipCount)
.Take(20)
.ToList();
I know the method .ListAsync() exists but I cannot get it working together with the Skip, Take and OrderBy method. 我知道方法.ListAsync()存在,但无法使其与Skip,Take和OrderBy方法一起使用。
Any help is much appreciated! 任何帮助深表感谢!
The solution to this question is : 这个问题的解决方案是:
var result = await q.Select(
Projections.Distinct(
Projections.Property<Business>(x => x.Id).WithAlias(() => bli.Id)
)
.TransformUsing(Transformers.AliasToBean<BusinessListItem>())
.OrderBy(x => x.Name).Asc
.Skip(_skipCount)
.Take(_takeCount)
.ListAsync<BusinessListItem>();
return result.ToList();
Thx to @DavidOsborne 感谢@DavidOsborne
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