TCheckConstraint¶

Record-level constraint definition.

Declaration¶

Source position: db.pas line 1295

type

  TCheckConstraint = class(TCollectionItem)
  public
    procedure Assign;
  published
    property CustomConstraint: string; {rw}
    property ErrorMessage: string; {rw}
    property FromDictionary: Boolean; {rw}
    property ImportedConstraint: string; {rw}
  end;

Inheritance¶

Description¶

TCheckConstraint can be used to store the definition of a record-level constraint. It does not enforce the constraint, it only stores the constraint's definition. The constraint can come from several sources: an imported constraints from the database, usually stored in the TCheckConstraint.ImportedConstraint property , or a constraint enforced by the user on a particular dataset instance stored in TCheckConstraint.CustomConstraint

Properties¶

Member	Visibility	Description
CustomConstraint	published	User-defined constraint.
ErrorMessage	published	Message to display when the constraint is violated.
FromDictionary	published	True if the constraint is imported from a datadictionary.
ImportedConstraint	published	Constraint imported from the database engine.

See all Properties

Methods¶

Member	Visibility	Description
Assign	public	Assign one constraint to another.

See all Methods

Name	Description
TCheckConstraints	Set of record-level constraints.
TCheckConstraint.ImportedConstraint	Constraint imported from the database engine.
TCheckConstraint.CustomConstraint	User-defined constraint.