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Add Projections.Conditional for CASE expressions with multiple conditions #2816

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101 changes: 101 additions & 0 deletions src/NHibernate.Test/Async/Criteria/ConditionalProjectionTest.cs
Original file line number Diff line number Diff line change
@@ -0,0 +1,101 @@
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by AsyncGenerator.
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------


using System;
using System.Linq;
using NHibernate.Criterion;
using NUnit.Framework;

namespace NHibernate.Test.Criteria
{
using System.Threading.Tasks;
[TestFixture]
public class ConditionalProjectionTestAsync : TestCase
{
protected override string MappingsAssembly => "NHibernate.Test";

protected override string[] Mappings => new [] {"Criteria.Enrolment.hbm.xml"};

protected override void OnSetUp()
{
using (var session = OpenSession())
using (var transaction = session.BeginTransaction())
{
session.Save(new Student {StudentNumber = 6L, Name = "testa"});
session.Save(new Student {StudentNumber = 5L, Name = "testz"});
session.Save(new Student {StudentNumber = 4L, Name = "test1"});
session.Save(new Student {StudentNumber = 3L, Name = "test2"});
session.Save(new Student {StudentNumber = 2L, Name = "test998"});
session.Save(new Student {StudentNumber = 1L, Name = "test999"});
transaction.Commit();
}
}

protected override void OnTearDown()
{
using (var session = Sfi.OpenSession())
using (var transaction = session.BeginTransaction())
{
session.CreateQuery("delete from System.Object").ExecuteUpdate();
transaction.Commit();
}
}

protected override bool AppliesTo(Dialect.Dialect dialect)
{
return !TestDialect.HasBrokenTypeInferenceOnSelectedParameters;
}

[Test]
public async Task UsingMultiConditionalsAsync()
{
using (var session = OpenSession())
using (session.BeginTransaction())
{
// when Name = "testa" then 1 ...
var orderOfNames = new Tuple<string, string>[]
{
System.Tuple.Create("test1", "1"),
System.Tuple.Create("testz", "2"),
System.Tuple.Create("test2", "3"),
System.Tuple.Create("testa", "4")
};

var criterionProjections =
orderOfNames
.Select(
x => new ConditionalProjectionCase(
Restrictions.Eq(nameof(Student.Name), x.Item1),
Projections.Constant(x.Item2)))
.ToArray();

// ... else 99
var elseProjection = Projections.Constant("99");

var conditionalsProjection = Projections.Conditional(criterionProjections, elseProjection);

var order = Order.Asc(conditionalsProjection);

var criteria = session.CreateCriteria(typeof(Student)).AddOrder(order);

var actuals = await (criteria.ListAsync<Student>());

Assert.That(actuals.Count, Is.GreaterThanOrEqualTo(orderOfNames.Length));
for (var i = 0; i < orderOfNames.Length; i++)
{
var expected = orderOfNames[i];
var actual = actuals[i];

Assert.That(actual.Name, Is.EqualTo(expected.Item1));
}
}
}
}
}
90 changes: 90 additions & 0 deletions src/NHibernate.Test/Criteria/ConditionalProjectionTest.cs
Original file line number Diff line number Diff line change
@@ -0,0 +1,90 @@
using System;
using System.Linq;
using NHibernate.Criterion;
using NUnit.Framework;

namespace NHibernate.Test.Criteria
{
[TestFixture]
public class ConditionalProjectionTest : TestCase
{
protected override string MappingsAssembly => "NHibernate.Test";

protected override string[] Mappings => new [] {"Criteria.Enrolment.hbm.xml"};

protected override void OnSetUp()
{
using (var session = OpenSession())
using (var transaction = session.BeginTransaction())
{
session.Save(new Student {StudentNumber = 6L, Name = "testa"});
session.Save(new Student {StudentNumber = 5L, Name = "testz"});
session.Save(new Student {StudentNumber = 4L, Name = "test1"});
session.Save(new Student {StudentNumber = 3L, Name = "test2"});
session.Save(new Student {StudentNumber = 2L, Name = "test998"});
session.Save(new Student {StudentNumber = 1L, Name = "test999"});
transaction.Commit();
}
}

protected override void OnTearDown()
{
using (var session = Sfi.OpenSession())
using (var transaction = session.BeginTransaction())
{
session.CreateQuery("delete from System.Object").ExecuteUpdate();
transaction.Commit();
}
}

protected override bool AppliesTo(Dialect.Dialect dialect)
{
return !TestDialect.HasBrokenTypeInferenceOnSelectedParameters;
}

[Test]
public void UsingMultiConditionals()
{
using (var session = OpenSession())
using (session.BeginTransaction())
{
// when Name = "testa" then 1 ...
var orderOfNames = new Tuple<string, string>[]
{
System.Tuple.Create("test1", "1"),
System.Tuple.Create("testz", "2"),
System.Tuple.Create("test2", "3"),
System.Tuple.Create("testa", "4")
};

var criterionProjections =
orderOfNames
.Select(
x => new ConditionalProjectionCase(
Restrictions.Eq(nameof(Student.Name), x.Item1),
Projections.Constant(x.Item2)))
.ToArray();

// ... else 99
var elseProjection = Projections.Constant("99");

var conditionalsProjection = Projections.Conditional(criterionProjections, elseProjection);

var order = Order.Asc(conditionalsProjection);

var criteria = session.CreateCriteria(typeof(Student)).AddOrder(order);

var actuals = criteria.List<Student>();

Assert.That(actuals.Count, Is.GreaterThanOrEqualTo(orderOfNames.Length));
for (var i = 0; i < orderOfNames.Length; i++)
{
var expected = orderOfNames[i];
var actual = actuals[i];

Assert.That(actual.Name, Is.EqualTo(expected.Item1));
}
}
}
}
}
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