Adding the Data Link

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The connection between a control and a database is handled by a class called a data link. The data link class that connects a control with a single field in a database is TFieldDataLink. There are also data links for entire tables.

A data-aware control owns its data link class. That is, the control has the responsibility for constructing and destroying the data link. For details on management of owned classes, see Creating a Graphic Component.

Establishing a data link as an owned class requires these three steps:

1. Declaring the Class Field
2. Declaring the Access Properties
3. Initializing the Data Link

See Also

• Responding to Data Changes