TCustomConnection class

Declaration

Inheritance

1. TCustomConnection
2. TComponent
3. TPersistent
4. TObject

Descends from it: TDatabase

Description

TCustomConnection must be used for all database classes that need a connection to a server. The class introduces some methods and classes to activate the connection ( Open) and to deactivate the connection ( Close), plus a property to inspect the state ( Connected) of the connected.

See also

• Open
• Close
• Connected

Properties

ForcedClose	protected
StreamedConnected	protected
DataSetCount	public	Number of datasets connected to this connection.
DataSets	public	Datasets linked to this connection.
Connected	published	Is the connection established or not.
LoginPrompt	published	Should the OnLogin be triggered.
AfterConnect	published	Event triggered after a connection is made.
AfterDisconnect	published	Event triggered after a connection is closed.
BeforeConnect	published	Event triggered before a connection is made.
BeforeDisconnect	published	Event triggered before a connection is closed.

Methods

DoCloseError	protected
SetForcedClose	protected
CloseForDestroy	protected
DoLoginPrompt	protected
DoConnect	protected
DoDisconnect	protected
GetConnected	protected
GetDataset	protected
GetDataSetCount	protected
GetLoginParams	protected
InternalHandleException	protected
Loaded	protected	Called when the component has finished loading.
SetConnected	protected
SetLoginParams	protected
Close	public	Close the connection.
Destroy	public	Remove the TCustomconnection instance from memory.
Open	public	Makes the connection to the server.

Events

OnLogin	published	Event triggered when a login prompt is shown.
OnCloseError	published

Inherited

From TComponent (74)

_AddRef _Release BeforeDestruction CanObserve ChangeName ComObject ComponentCount ComponentIndex Components ComponentState ComponentStyle Create DefineProperties DesignInfo DestroyComponents Destroying ExecuteAction FindComponent FreeNotification FreeOnRelease GetChildOwner GetChildParent GetChildren GetDeltaStreams GetEnumerator GetIDsOfNames GetNamePath GetObservers GetOwner GetParentComponent GetTypeInfo GetTypeInfoCount HasParent iicrGetComponent InsertComponent Invoke IsImplementorOf Loading Name Notification ObserverAdded Observers OnGetDeltaStreams Owner PaletteCreated QueryInterface ReadDeltaState ReadDeltaStream ReadState ReferenceInterface RemoveComponent RemoveFreeNotification RemoveFreeNotifications SafeCallException SetAncestor SetChildOrder SetDesigning SetDesignInstance SetInline SetName SetParentComponent SetSubComponent Tag ToString TToStringNameMode UpdateAction Updated UpdateRegistry Updating ValidateContainer ValidateInsert ValidateRename VCLComObject WriteState

From TPersistent (5)

Assign AssignTo FPOAttachObserver FPODetachObserver FPONotifyObservers

From TObject (37)

AfterConstruction 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 StringMessageTable SystemHasExtendedRTTI UnitName