public virtual IStorageProviderCommand <IEnumerable <ObjectLookupResult <object> >, IRdbmsProviderCommandExecutionContext> CreateForMultiTimestampLookup(
IEnumerable <ObjectID> objectIDs)
{
ArgumentUtility.CheckNotNull("objectIDs", objectIDs);
var dbCommandBuildersAndReaders =
from id in objectIDs
let tableDefinition = _tableDefinitionFinder.GetTableDefinition(id)
group id by tableDefinition
into idsByTable
let selectedColumns = idsByTable.Key.ObjectIDProperty.GetColumns().Concat(idsByTable.Key.TimestampProperty.GetColumns()).ToArray()
let timestampReader = _objectReaderFactory.CreateTimestampReader(idsByTable.Key, selectedColumns)
let dbCommandBuilder = CreateIDLookupDbCommandBuilder(idsByTable.Key, selectedColumns, idsByTable)
select Tuple.Create(dbCommandBuilder, timestampReader);
var loadCommand = new MultiObjectLoadCommand <Tuple <ObjectID, object> > (dbCommandBuildersAndReaders);
return(DelegateBasedCommand.Create(
loadCommand,
lookupResults => lookupResults.Select(
result =>
{
Assertion.IsNotNull(
result.Item1,
"Because we included IDColumn into the projection and used it for the lookup, every row in the result set certainly has an ID.");
return new ObjectLookupResult <object> (result.Item1, result.Item2);
})));
}
protected virtual IStorageProviderCommand <IEnumerable <DataContainer>, IRdbmsProviderCommandExecutionContext> CreateForIndirectRelationLookup(
UnionViewDefinition unionViewDefinition,
RelationEndPointDefinition foreignKeyEndPoint,
ObjectID foreignKeyValue,
SortExpressionDefinition sortExpression)
{
var selectedColumns = unionViewDefinition.ObjectIDProperty.GetColumns();
var dbCommandBuilder = _dbCommandBuilderFactory.CreateForSelect(
unionViewDefinition,
selectedColumns,
GetComparedColumns(foreignKeyEndPoint, foreignKeyValue),
GetOrderedColumns(sortExpression));
var objectIDReader = _objectReaderFactory.CreateObjectIDReader(unionViewDefinition, selectedColumns);
var objectIDLoadCommand = new MultiObjectIDLoadCommand(new[] { dbCommandBuilder }, objectIDReader);
var indirectDataContainerLoadCommand = new IndirectDataContainerLoadCommand(objectIDLoadCommand, _storageProviderCommandFactory);
return(DelegateBasedCommand.Create(
indirectDataContainerLoadCommand,
lookupResults => lookupResults.Select(
result =>
{
Assertion.IsNotNull(
result.LocatedObject,
"Because ID lookup and DataContainer lookup are executed within the same database transaction, the DataContainer can never be null.");
return result.LocatedObject;
})));
}
public void Create()
{
var innerCommandStub = MockRepository.GenerateStub <IStorageProviderCommand <string, object> >();
Func <string, int> operation = s => s.Length;
var instance = DelegateBasedCommand.Create(innerCommandStub, operation);
Assert.That(instance, Is.TypeOf(typeof(DelegateBasedCommand <string, int, object>)));
Assert.That(instance.Command, Is.SameAs(innerCommandStub));
Assert.That(instance.Operation, Is.SameAs(operation));
}