DevExpress.DataAccess.DataFederation Namespace

Contains classes that support federated queries and the Federation data source.

Assembly: DevExpress.DataAccess.v19.2.dll

Classes

Name	Description
FederationDataSource	A federated data source that integrates different data sources and provides uniform data access with a federated query.
FederationDataSourceBase	A base class for the classes that implement federated data sources.
FederationMasterDetailInfo	Identifies the master-detail relationship defined by federated queries.
FederationMasterDetailInfo.EqualityComparer	Provides methods to support the comparison of objects for equality.
FederationRelationColumnInfo	Describes the relation and contains key column names and a relation condition operator.
JoinElement	Defines the JOIN clause.
JoinElement.EqualityComparer	Provides methods to support the comparison of objects for equality.
JoinElementCollection	Contains JoinElement objects.
MasterDetailInfoCollection
QueryBuildingExtensions static	Provides extension methods to build a federated query with Fluent API.
QueryNode	Base class for SQL query that retrieves data from one or more sources.
QueryNodeCollection	A collection of federated queries.
SelectColumnExpression	Defines a column in the SELECT statement by the name, alias and source.
SelectColumnExpression.SelectColumnTypeConverter	A type converter for the column data type.
SelectExpressionCollection	A collection of objects that define columns in the SELECT statement.
SelectNode	A node that provides data with a SELECT query.
SelectNode.EqualityComparer	Provides methods to support the comparison of objects for equality.
SelectNodeBuilder	Provides a Fluent interface method used to build a federated query.
Source	A data source that is part of the federated data source.
Source.EqualityComparer
SourceNode
SourceNode.EqualityComparer	Provides methods to support the comparison of objects for equality.
UnionNode	A node that provides data with a Union query.
UnionNode.EqualityComparer
UnionNodeBuilder	Provides a Fluent interface method to build a union query.

Interfaces

Name	Description
IAliasedNode	Defines a node that has a name and an alias.
IJoinNode	Defines a node that can take part in JOIN statements.
ISelectExpression	Defines a node that can contain a SELECT expression.

Structs

Name	Description
SelectStatement	Defines the column and its alias in the SELECT expression.

Enums

Name	Description
FederationConditionType	Specifies the relation’s condition.
JoinType	Lists JOIN types.
UnionType	Lists values that specify the result set of the query that combines result sets of two or more queries.