RelationCollection Class

Class which is used to stack relation objects between several entities to build a complete join path

Inheritance Hierarchy

SystemObject
SD.LLBLGen.Pro.ORMSupportClassesRelationCollection

Namespace: SD.LLBLGen.Pro.ORMSupportClasses
Assembly: SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.8.0.0 (5.8.21.0111)

Syntax

Copy

[SerializableAttribute]
public class RelationCollection : IList, 
	ICollection, IEnumerable, IRelationCollection, IXmlSerializable, IDeserializationCallback

<SerializableAttribute>
Public Class RelationCollection
	Implements IList, ICollection, IEnumerable, IRelationCollection, 
	IXmlSerializable, IDeserializationCallback

The RelationCollection type exposes the following members.

Constructors

	Name	Description
	RelationCollection	CTor
	RelationCollection(IDynamicRelation)	Initializes a new instance of the RelationCollection class.
	RelationCollection(IEntityRelation)	Initializes a new instance of the RelationCollection class.
	RelationCollection(IEntityRelation, JoinHint)	Initializes a new instance of the RelationCollection class.
	RelationCollection(IEntityRelation, String, JoinHint)	Initializes a new instance of the RelationCollection class.

Top

Properties

	Name	Description
	Capacity	Returns the capacity of the collection
	Count	returns the number of relations in this collection
	CustomFilterParameters	Gets Custom Filter Parameters, created in ToQueryText and which are used in custom filters.
	DatabaseSpecificCreator	Object which will be used to create valid parameter objects, field names, including prefix/postfix characters, and conversion routines, and field names, including prefix/postfix characters. Uses the strategy pattern so the generic code can work with more than one target database.
	FromClauseDirectives	Gets from clause directives which are to be set on FROM clause elements in the resulting SQL query.
	Item	Indexer in the collection.
	ObeyWeakRelations	Gets / sets ObeyWeakRelations, which is the flag to signal the collection what kind of join statements to generate in the ToQueryText statement, which is called by the DQE. Weak relationships are relationships which are optional, for example a customer with no orders is possible, because the relationship between customer and order is based on a field in order. When this property is set to true (default: false), weak relationships will result in LEFT JOIN statements. When set to false (which is the default), INNER JOIN statements are used.
	SelectListAlias	Optional alias for select list fields. Used in entity fetches where the entity type to fetch has to be aliased because the source of the data is a derived table or requires aliasing because the relations used require that. If specified, all predicates referring to the entity type to fetch have to use the same alias.
	WillPotentiallyCauseDuplicateRows	Gets a value indicating whether the contents of this relation collection will result in joins which result in duplicate data. This is the case if there's at least one 1:n or m:n relation.

Top

Methods

	Name	Description
	Add(IDynamicRelation)	Adds the passed in IDynamicRelation instance to the list
	Add(IEntityRelation)	Adds the passed in IEntityRelation instance to the list.
	Add(IRelation)	Adds the passed in relation to this collection
	Add(IEntityRelation, JoinHint)	Adds the passed in IEntityRelation instance to the list.
	Add(IEntityRelation, String)	Adds the passed in IEntityRelation instance to the list, under the alias specified for the end entity. The start entity gets no alias. The weakness of the relation is considered based on the ObeyWeakRelations setting.
	Add(IEntityRelation, String, JoinHint)	Adds the passed in IEntityRelation instance to the list, under the alias specified for the end entity and will consider the relation's weakness based on the hint value. The start entity gets no alias.
	Add(IEntityRelation, String, String, JoinHint)	Adds the passed in IEntityRelation instance to the list, under the aliases specified and will consider the relation's weakness based on the hint value. The start entity gets no alias.
	AddRange	Adds the range of IRelation objects stored in c to this collection.
	Clear	Removes all items from the IList.
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetAllDerivedTables	Gets all derived tables in the relations inside this relation collection.
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetUsedEntityTypeNamesAndAliases	Gets per alias specified in a relation all entity names covered by that alias. This means that if an entity in a relation is based on multiple entities (through inheritance) it will return all entity names the entity is based on, from the actual entity to the root of the hierarchy path and every entity name in between.
	Insert	Adds the passed in IRelation instance to the list at position index.
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	PreprocessRelations	Preprocesses the relations in this relationcollection The start/end entity can have an inheritance info object with them, causing these relations to be inserted at that spot, where the additional relations for the start entity are added BEFORE the actual relation and the relations for the end entity AFTER the actual relation.
	Remove	Removes the passed in IRelation instance. Only the first instance will be removed.
	ToQueryText	Converts the set of relations to a set of nested JOIN query elements using ANSI join syntaxis. Oracle 8i doesn't support ANSI join syntaxis and therefore the OracleDQE has its own join code. It uses a database specific creator object for database specific syntaxis, like the format of the tables / views and fields.
	ToQueryTextNonAnsi	Converts the set of relations to a set of nested JOIN query elements using ANSI join syntaxis. Oracle 8i doesn't support ANSI join syntaxis and therefore the OracleDQE has its own join code. It uses a database specific creator object for database specific syntaxis, like the format of the tables / views and fields.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

Top

Extension Methods

	Name	Description
	CloneWithoutFirst	Clones the relationcollection without the first relation. (Defined by ORMClassExtensions.)
	IsEmpty	Determines whether the specified relation collection is empty. A null passed in is also considered empty. (Defined by ORMClassExtensions.)
	Last	Gets the last relation in the passed in relations collection or null if it's empty (Defined by ORMClassExtensions.)
	RemoveLast	Removes the last relation from the passed in relationcollection. Assumes last entry is an entity relation (Defined by ORMClassExtensions.)

Top

Explicit Interface Implementations

	Name	Description
	IListAdd	Adds an item to the IList.
	IListContains	Determines whether the IList contains a specific value.
	ICollectionCopyTo	Copies the elements of the ICollection to an Array, starting at a particular Array index.
	IEnumerableGetEnumerator	Returns an enumerator that iterates through a collection.
	IXmlSerializableGetSchema	This method is reserved and should not be used. When implementing the IXmlSerializable interface, you should return null (Nothing in Visual Basic) from this method, and instead, if specifying a custom schema is required, apply the XmlSchemaProviderAttribute to the class.
	IListIndexOf	Determines the index of a specific item in the IList.
	IListInsert	Inserts an item to the IList at the specified index.
	IListIsFixedSize	Gets a value indicating whether the IList has a fixed size.
	IListIsReadOnly	Gets a value indicating whether the IList is read-only.
	ICollectionIsSynchronized	Gets a value indicating whether access to the ICollection is synchronized (thread safe).
	IListItem	Gets or sets the element at the specified index.
	IDeserializationCallbackOnDeserialization	Runs when the entire object graph has been deserialized.
	IXmlSerializableReadXml	Generates an object from its XML representation.
	IListRemove	Removes the first occurrence of a specific object from the IList.
	IListRemoveAt	Removes the IList item at the specified index.
	ICollectionSyncRoot	Gets an object that can be used to synchronize access to the ICollection.
	IXmlSerializableWriteXml	Converts an object into its XML representation.
	IRelationCollectionAddFromClauseDirectives	Adds the from clause directives specified to this collection
	IRelationCollectionReadXml	Deserializes the object data on the xml reader into this instance
	IRelationCollectionToggleArtificialAliasingForTargetPerEntityRelations	Enables / disables the artificial aliasing for target per entity relations. This method is used to enable the artificial aliasing of entities which are in a hierarchy of TargetPerEntity and which are in the relations of this collection. This is switched on for dyn/typedlist fetches to be sure dyn/typedlists with fields from multiple entities in the same inheritance hierarchy will be retrievable properly, as they need aliasing under the hood but if the developer didn't alias the entities, the query will fail because the supertype(s) aren't joined multiple types.
	IRelationCollectionWriteXml	Serializes the object as xml to the writer specified.

Top

Reference

SD.LLBLGen.Pro.ORMSupportClasses Namespace