使用in子句NHibernate多个子查询

Question

我有一个以下工作SQL查询：

SELECT * FROM truck t
WHERE t.currentlocationdbid IN (SELECT dbid FROM location WHERE name = 'Los Angeles')
OR t.nextdestinationdbid IN (SELECT dbid FROM location WHERE name = 'Chicago' OR name = 'New York');

我想在NHibernate中写这个。当然，当它为每个实体多次访问数据库时，但我想让它成为一次旅行。看看像this，this或this这样的分离查询的示例，但没有一个对我有效。试图用别名和标准来做。

几十次尝试之一：

var subQuery1 = QueryOver.Of<LocationEntity>().Where(l => l.Name == LocationNameEnum.LA);
var subQuery2 = QueryOver.Of<LocationEntity>().Where(l => l.Name == LocationNameEnum.CHG || l.Name == LocationNameEnum.NY);

var poc = session.QueryOver<TruckEntity>()
                 .WithSubquery.WhereProperty(t => t.CurrentLocation).In(subQuery1)
                 .WithSubquery.WhereProperty(t => t.NextDestination).In(subQuery2)
                 .List<TruckEntity>();

提前感谢任何建议。

Answer 1

你得到它几乎是正确的，你只缺少SQL中的.Where(Restrictions.Disjunction()...)的or。

基于您的代码（假设您在Id中拥有属性LocationEntity）：

// get IDs to look for in CurrentLocation
var subQuery1 = QueryOver.Of<LocationEntity>()
    .Where(l => l.Name == LocationNameEnum.LA)
    .Select(x => x.Id);

// get IDs to look for in NextDestination
var subQuery2 = QueryOver.Of<LocationEntity>()
    .Where(l => l.Name == LocationNameEnum.CHG || l.Name == LocationNameEnum.NY)
    .Select(x => x.Id);

var poc = session.QueryOver<TruckEntity>()
    .Where(Restrictions.Disjunction() // this takes care of the OR
        .Add(Subqueries.WhereProperty<TruckEntity>(x => x.CurrentLocation.Id).In(subQuery1))
        .Add(Subqueries.WhereProperty<TruckEntity>(x => x.NextDestination.Id).In(subQuery2))
    )
    .List<TruckEntity>();