public IBinaryExpressionBuilder Extern(IEntityRelation relation)
{
var expression = (IBinaryExpressionBuilder)relation.Expression.Clone();
if (!this.Extern(relation, expression))
{
throw new NotImplementedException();
}
return(expression);
}
/// <summary>
/// Generates a relation statement.
/// </summary>
/// <param name="entityRelation">
/// The entity relation to generate a statement for.
/// </param>
/// <returns>
/// The relation statement as a <see cref="string"/>.
/// </returns>
private string GenerateRelationStatement(IEntityRelation entityRelation)
{
var joinType = GetJoinClause(entityRelation.RelationType);
var useAliasSuffix = string.IsNullOrWhiteSpace(this.AliasSuffix) == false;
var sourceReference = this.definitionProvider.GetEntityReference(entityRelation.SourceExpression);
var sourceDefinition = this.definitionProvider.Resolve(sourceReference.EntityType);
var sourceAlias = entityRelation.SourceEntityAlias ?? sourceReference.EntityAlias;
sourceReference.EntityAlias = useAliasSuffix ? $"{sourceAlias ?? sourceDefinition.EntityName}{this.AliasSuffix}" : sourceAlias;
var sourceLocation = this.definitionProvider.GetEntityLocation(sourceReference);
var sourceAttribute =
this.definitionProvider.Resolve(sourceReference.EntityType)
.DirectAttributes.FirstOrDefault(x => x.PropertyName == entityRelation.SourceExpression.GetPropertyName());
var sourceName = this.nameQualifier.Qualify(sourceAttribute, sourceLocation);
var relationReference = this.definitionProvider.GetEntityReference(entityRelation.RelationExpression);
var relationDefinition = this.definitionProvider.Resolve(relationReference.EntityType);
var relationAlias = entityRelation.RelationEntityAlias ?? relationReference.EntityAlias;
relationReference.EntityAlias = useAliasSuffix ? $"{relationAlias ?? relationDefinition.EntityName}{this.AliasSuffix}" : relationAlias;
var relationLocation = this.definitionProvider.GetEntityLocation(relationReference);
var relationAttribute =
this.definitionProvider.Resolve(relationLocation.EntityType)
.DirectAttributes.FirstOrDefault(x => x.PropertyName == entityRelation.RelationExpression.GetPropertyName());
var relationEntity = this.nameQualifier.GetPhysicalName(relationAttribute.Entity);
var relationName = this.nameQualifier.Qualify(relationAttribute, relationLocation);
if (string.IsNullOrWhiteSpace(relationLocation.Alias) && useAliasSuffix == false)
{
// Use the entity names for the inner join if no alias has been requested.
return(string.Format(
CultureInfo.InvariantCulture,
RelationStatementFormat,
joinType,
relationEntity,
sourceName,
relationName));
}
// Use the entity names names for the inner join and alias the table.
return(string.Format(
CultureInfo.InvariantCulture,
AliasedRelationStatementFormat,
joinType,
relationEntity,
this.nameQualifier.Escape(relationLocation.Alias), // TODO: could be null, need to verify
sourceName,
relationName));
}
/// <summary>
/// Adds a relation to the selection.
/// </summary>
/// <param name="relation">
/// The relation to add.
/// </param>
/// <returns>
/// The current <see cref="EntityRelationSet{T}"/>.
/// </returns>
private EntityRelationSet <TEntity> AddRelation([NotNull] IEntityRelation relation)
{
if (relation == null)
{
throw new ArgumentNullException(nameof(relation));
}
////if (this.entityRelations.Contains(relation) == false)
////{
this.entityRelations.Add(relation);
////}
return(this);
}
public string PrepareRelatedFieldDataQueries(IEntityRelation relation, IDBEntity childEntity)
{
if (relation.Type == EntityRelationType.ManyToMany)
{
var relField = relation.ParentRefField.DBName;
return($@"select {childEntity.IDField} as id, {childEntity.TextField} as name, pId from {childEntity.DBName} as c1
join (
SELECT pField[s] as x, pId FROM (SELECT {relField} as pField, {_Entity.IDField} as pId, generate_subscripts({relField}, 1) AS s FROM {_Entity.DBName} where id = ANY(@ItemId) ) AS foo
) as z
on c1.{childEntity.IDField} = z.x;");
}
return("");
}
/// <summary>
/// Builds the relation collection for a fetch of all threads with statistics.
/// </summary>
/// <returns>A ready to use relationcollection</returns>
/// <returns>Doesn't add the thread-forum relation.</returns>
internal static RelationCollection BuildRelationsForAllThreadsWithStats()
{
RelationCollection relations = new RelationCollection();
relations.Add(ThreadEntity.Relations.UserEntityUsingStartedByUserID, "ThreadStarterUser", JoinHint.Left);
IEntityRelation threadMessage = ThreadEntity.Relations.MessageEntityUsingThreadID;
// the custom filter of the relation is a subquery which compares the messageID of the last message in the thread with the messageid of the set to join
threadMessage.CustomFilter = new PredicateExpression(
new FieldCompareSetPredicate(MessageFields.MessageID.SetObjectAlias("LastMessage"),
MessageFields.MessageID, SetOperator.Equal,
(MessageFields.ThreadID == MessageFields.ThreadID.SetObjectAlias("LastMessage")), null, string.Empty, 1,
new SortExpression(MessageFields.PostingDate | SortOperator.Descending)));
// now add the relation to the relationcollection, we'll alias the message entity in the relation so we can refer to it in our custom filter.
relations.Add(threadMessage, "LastMessage");
relations.Add(MessageEntity.Relations.UserEntityUsingPostedByUserID, "LastMessage", "LastPostingUser", JoinHint.Left);
return(relations);
}
protected virtual bool Extern(IEntityRelation relation, IBinaryExpressionBuilder expression)
{
//Nothing to do.
return(true);
}
/// <summary>
/// Discovers the entity navigators.
/// </summary>
/// <param name="entitySchemaData">The entity schema data.</param>
private void DiscoverEntityNavigators(EntityTypeSchemaData entitySchemaData)
{
var entityType = entitySchemaData.EntityType;
if (entitySchemaData.Factory == null)
{
throw new InvalidOperationException(string.Format("Factory is null in entitySchemaData for entity '{0}'", entitySchemaData.EntityType.FullName));
}
var dummyInstance = entitySchemaData.Factory.Create();
var relationsWithMappedFields = dummyInstance.GetAllRelations().Where(r => !string.IsNullOrEmpty(r.MappedFieldName) && !r.IsHierarchyRelation);
var relationPerMappedFieldName = relationsWithMappedFields.ToDictionary(r => r.MappedFieldName);
var properties = TypeDescriptor.GetProperties(entityType).Cast <PropertyDescriptor>();
var inheritedProperties = new HashSet <PropertyDescriptor>(DetermineInheritedProperties(entitySchemaData.EntityType, properties));
var childrenCollection = entitySchemaData.RelatedExplorerItem.Children;
foreach (PropertyDescriptor property in properties)
{
if (!(typeof(IEntityCore).IsAssignableFrom(property.PropertyType) || typeof(IEntityCollectionCore).IsAssignableFrom(property.PropertyType)))
{
// not an entity navigator,
continue;
}
string suffix = string.Empty;
bool inherited = false;
if (inheritedProperties.Contains(property))
{
suffix = string.Format(" (Inherited from '{0}')", property.ComponentType.Name.Replace("Entity", ""));
inherited = true;
}
// relationMapped can be null, in the case of a m:n navigator.
IEntityRelation relationMapped = null;
relationPerMappedFieldName.TryGetValue(property.Name, out relationMapped);
if (typeof(IEntityCore).IsAssignableFrom(property.PropertyType))
{
var relatedEntitySchemaData = GetEntitySchemaDataForType(property.PropertyType);
// single entity navigator, or property added manually.
if (relationMapped == null)
{
// property added manually, ignore.
continue;
}
var icon = relationMapped.TypeOfRelation == RelationType.ManyToOne ? ExplorerIcon.ManyToOne : ExplorerIcon.OneToOne;
if (inherited)
{
icon = ExplorerIcon.Inherited;
}
childrenCollection.Add(new ExplorerItem(property.Name + suffix, ExplorerItemKind.ReferenceLink, icon)
{
DragText = property.Name,
HyperlinkTarget = relatedEntitySchemaData == null ? null : relatedEntitySchemaData.RelatedExplorerItem
});
continue;
}
if (typeof(IEntityCollectionCore).IsAssignableFrom(property.PropertyType))
{
// collection navigator. We have to determine which entity type is returned from the collection.
// First, check if there's a TypeContainedAttribute on the property. If so, use the type in the attribute. If not,
// try to determine the type using the linq utils method.
Type containedType = null;
var typeContainedAttribute = property.Attributes[typeof(TypeContainedAttribute)] as TypeContainedAttribute;
if ((typeContainedAttribute != null) && typeContainedAttribute.TypeContainedInCollection != null)
{
containedType = typeContainedAttribute.TypeContainedInCollection;
}
else
{
containedType = LinqUtils.DetermineEntityTypeFromEntityCollectionType(property.PropertyType);
}
var relatedEntitySchemaData = GetEntitySchemaDataForType(containedType);
var icon = relationMapped == null ? ExplorerIcon.ManyToMany : ExplorerIcon.OneToMany;
if (inherited)
{
icon = ExplorerIcon.Inherited;
}
childrenCollection.Add(new ExplorerItem(property.Name + suffix, ExplorerItemKind.CollectionLink, icon)
{
DragText = property.Name,
HyperlinkTarget = relatedEntitySchemaData == null ? null : relatedEntitySchemaData.RelatedExplorerItem
});
}
}
}
