EntityDAC

TCustomEntityContext.GetEntity Method

The method is designed for retrieving an existing entity instance by specified criteria.

Class

TCustomEntityContext

Syntax

function GetEntity(EntityClass: TMappedEntityClass; const KeyValues: array of Variant): TMappedEntity; overload;

Parameters
EntityClass
The class type of the entity to be retrieved.
KeyValues
The value of the entity primary key.

Remarks

The method returns an entity instance of the specified meta-type selected by the specified complex primary key values. The entity instance created by this method is initially attached to the data context and placed to the object cache (in contrast to the TCustomEntityContext.CreateEntity method), therefore you can already perform modification operations for the instance: TCustomEntityContext.Delete, TCustomEntityContext.Cancel) without pre-calling TCustomEntityContext.Attach. In addition, this entity instance will be automatically destroyed, and there will be no need to provide for its manual destruction.

Example

var
  EmpType: IMetaType;
  EmpEntity: TEmp;
begin
  EmpType := Context['Emp'];
  EmpEntity := Context.GetEntity(EmpType, [1, 1]) as TEmp;
  // ...
end; 
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