Data.DB.TParam

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[–] Properties Type: class Visibility: public Source:

Data.DB.pas

Data.DB.hpp

Unit: Data.DB Parent: Data.DB

Delphi

TParam = class(TCollectionItem)

C++

class PASCALIMPLEMENTATION TParam : public System::Classes::TCollectionItem

Description

TParam represents a field parameter for a query or stored procedure.

Use the properties of a TParam to set the value of a parameter that represents the value of a field. Datasets that represent queries and stored procedures create TParam objects to represent the parameters of their query or stored procedures. Client datasets use TParam objects to pass parameter values to a source dataset.

Note: ADO-based datasets do not use TParam objects to represent parameter values. They use the TParameter class instead.

TParam shares many properties with TField, as both describe the value of a field in a dataset. However, a TField object has several properties to describe the field binding, and how the field is displayed, edited, or calculated that are not needed in a TParam object. Conversely, TParam includes properties that indicate how the field value is passed as a parameter.

See Also

• TField

• TParams

• TCustomClientDataSet

• TCustomSQLDataSet

• Using Parameters in Queries