TCheckConstraint class

Declaration

Inheritance

1. TCheckConstraint
2. TCollectionItem
3. TPersistent
4. TObject

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 ImportedConstraint property , or a constraint enforced by the user on a particular dataset instance stored in CustomConstraint

See also

• TCheckConstraints
• ImportedConstraint
• CustomConstraint

Properties

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.

Methods

Assign

public

Assign one constraint to another.

Inherited

From TCollectionItem (13)

Changed Collection Create Destroy DisplayName GetDisplayName GetNamePath GetOwner ID Index SetCollection SetDisplayName SetIndex

From TPersistent (5)

AssignTo DefineProperties FPOAttachObserver FPODetachObserver FPONotifyObservers

From TObject (40)

AfterConstruction BeforeDestruction CheckDisposed ClassInfo ClassName ClassNameIs ClassParent ClassType CleanupInstance DefaultHandler DefaultHandlerStr Dispatch DispatchStr Disposed DisposeOf Equals FieldAddress Free FreeInstance GetDisposed GetHashCode GetInterface GetInterfaceByStr GetInterfaceEntry GetInterfaceEntryByStr GetInterfaceTable GetInterfaceWeak GetLastCastErrorInfo InheritsFrom InitInstance InstanceSize MethodAddress MethodName newinstance QualifiedClassName SafeCallException StringMessageTable SystemHasExtendedRTTI ToString UnitName