TMasterDataLink¶

Datalink for Master-Detail relationships between datasets.

Declaration¶

Source position: db.pas line 2081

type

  TMasterDataLink = class(TDetailDataLink)
  public
    constructor Create;
    destructor Destroy;
    property FieldNames: string; {rw}
    property Fields: TList; {r}
    property OnMasterChange: TNotifyEvent; {rw}
    property OnMasterDisable: TNotifyEvent; {rw}
  end;

Inheritance¶

Description¶

TMasterDataLink is a TDatalink descendent which handles master-detail relations. It can be used in TDataset descendents that must have master-detail functionality: the detail dataset creates an instance of TMasterDataLink to point to the master dataset, which is subsequently available through the TDataLink.Dataset property.

The class also provides functionality for keeping a list of fields that make up the master-detail functionality, in the TMasterDatalink.FieldNames and TMasterDataLink.Fields properties.

This class should never be used in application code.

Properties¶

Member	Visibility	Description
FieldNames	public	List of fieldnames that make up the master-detail relationship.
Fields read only	public	List of fields as specified in FieldNames.

See all Properties

Methods¶

Member	Visibility	Description
Create	public	Create a new instance of TMasterDataLink.
Destroy	public	Free the datalink instance from memory.

See all Methods

Events¶

Member	Visibility	Description
OnMasterChange	public	Called whenever the master dataset data changes.
OnMasterDisable	public	Called whenever the master dataset is disabled.

See all Events

Name	Description
TDataset	Base class for records-based data-access.
TDatalink.DataSource	Datasource this datalink is connected to.
TDatalink.DataSet	Dataset this datalink is connected to.
TMasterDatalink.FieldNames	List of fieldnames that make up the master-detail relationship.
TMasterDataLink.Fields	List of fields as specified in FieldNames.