FireDAC.Phys.MongoDBWrapper.TMongoPipeline.Lookup

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Delphi

function Lookup(const AFrom, ALocalField, AForeignField, AAs: String): TMongoPipeline;

C++

TMongoPipeline* __fastcall Lookup(const System::UnicodeString AFrom, const System::UnicodeString ALocalField, const System::UnicodeString AForeignField, const System::UnicodeString AAs);

Properties

Type Visibility Source Unit Parent
function public
FireDAC.Phys.MongoDBWrapper.pas
FireDAC.Phys.MongoDBWrapper.hpp
FireDAC.Phys.MongoDBWrapper TMongoPipeline

Description

Defines the $lookup stage that performs a left outer join to an unsharded collection in the same database to filter in documents from the “joined” collection for processing.

For more information, see $lookup (aggregation) in MongoDB documentation.

See Also