6

この SQL ステートメントを NHibernate Criteria に変換する方法はありますか?

(select b1.FieldA as Name, b1.FieldA as FullName from Sale b1 where b1.FieldA like '%john%' or b1.FieldA like '%john%' order by b1.Id desc)
union 
(select b2.FieldC as Name, b2.FieldD as FullName from Sale b2 where b2.FieldC like '%john%' or b2.FieldD like '%john%' order by b2.Id desc)
union 
(select c.FieldE as Name, c.FieldF as FullName from Client c where c.FieldE like '%john%' or c.FieldF like '%john%' order by c.Id desc)

NHibernate がユニオンをサポートしていないことがわかりました。

4

2 に答える 2

2

だから、私は2つの解決策を見つけました。結果を連結するのではなく、各クエリを個別に実行します。Union に似ていますが、DB では実行されず、メモリで実行されます。

var b1 = Session.Query<Sale>()
            .Where(x => x.FiledA.Contains(filter) || x.FiledB.Contains(filter))
            .OrderBy(x => x.Id)
            .GroupBy(x => new { x.FiledA, x.FiledB })
            .Select(x => new Foo { FullName = x.Key.FiledA, Name = x.Key.FiledB })
            .Take(30)
            .ToList();

var b2 = Session.Query<Sale>()
            .Where(x => x.FiledC.Contains(filter) || x.FiledD.Contains(filter))
            .OrderBy(x => x.Id)
            .GroupBy(x => new {x.FiledC, x.FiledD})
            .Select(x => new Foo {FullName = x.Key.FiledC, Name = x.Key.FiledD})
            .Take(30)
            .ToList();


var c = Session.Query<Client>()
            .Where(x => x.FiledE.Contains(filter) || x.FiledF.Contains(filter))
            .OrderBy(x => x.Id)
            .GroupBy(x => new { x.FiledE, x.FiledF })
            .Select(x => new Foo { FullName = x.Key.FiledE, Name = x.Key.FiledF })
            .Take(30)
            .ToList();

return b1.Concat(b2)
         .Concat(c)
         .ToList()
         .GroupBy(x => new { x.Name, x.FullName })
         .Select(x => x.First())
         .Take(30);

また

var b1 = Session.CreateCriteria<Sale>()
    .SetProjection(Projections.ProjectionList()
        .Add(Projections.Distinct(Projections.Property("FiledA")), "Name")
        .Add(Projections.Property("FiledB"), "FullName"))
    .Add(Restrictions.Or(Restrictions.InsensitiveLike("FiledA", filter),
        Restrictions.InsensitiveLike("FiledB", filter)))
    .AddOrder(Order.Desc("Id"))
    .SetMaxResults(30)
    .SetResultTransformer(Transformers.AliasToBean<Foo>())
    .List<Foo>();

var b2 = Session.CreateCriteria<Sale>()
    .SetProjection(Projections.ProjectionList()
        .Add(Projections.Distinct(Projections.Property("FiledC")), "Name")
        .Add(Projections.Property("FiledD"), "FullName"))
    .Add(Restrictions.Or(Restrictions.InsensitiveLike("FiledC", filter),
        Restrictions.InsensitiveLike("FiledD", filter)))
    .AddOrder(Order.Desc("Id"))
    .SetMaxResults(30)
    .SetResultTransformer(Transformers.AliasToBean<Foo>())
    .List<Foo>();

var c = Session.CreateCriteria<Client>()
    .SetProjection(Projections.ProjectionList()
        .Add(Projections.Distinct(Projections.Property("FiledE")), "Name")
        .Add(Projections.Property("FieldF"), "FullName"))
    .Add(Restrictions.Or(Restrictions.InsensitiveLike("FiledE", filter),
        Restrictions.InsensitiveLike("FieldF", filter)))
    .AddOrder(Order.Desc("Id"))
    .SetMaxResults(30)
    .SetResultTransformer(Transformers.AliasToBean<Foo>())
    .List<Foo>();

return b1.Concat(b2)
         .Concat(c)
         .ToList()
         .GroupBy(x => new {x.FullName, x.Name})
         .Select(x => x.First())
         .Take(30);
于 2013-09-05T13:38:03.843 に答える
1

ビューを使用してみてください。NHibernate で直接マップすることができ、特定のデータベース実装に依存しません。where 句を削除する必要があります。そうすれば、"Name" と "FullName" に対する NHibernate 基準を作成できます。

  (select b1.FieldA as Name, b1.FieldA as FullName from Sale b1 order by b1.Id desc)
  union 
  (select b2.FieldC as Name, b2.FieldD as FullName from Sale b2 order by b2.Id desc)
  union 
  (select c.FieldE as Name, c.FieldF as FullName from Client c order by c.Id desc)
于 2013-09-04T21:14:27.197 に答える