Is data file locked
Is data file locked* : Boolean
| Parameter | Type | Description | |
|---|---|---|---|
| Function result | Boolean | ← | True = file/segment locked False = file/segment not locked |
Description
he Is data file locked command returns True if the data file of the open database or at least one of its segments is locked — i.e. write protected.
Placed, for instance, in the , this command enables the prevention of any risk of accidental opening of a locked data file.
Example
This method will prevent the opening of the database if the data file is locked:
If(Is data file locked)
ALERT("The data file is locked. Impossible to open database.")
QUIT 4D
End if
Properties
| Command number | 716 |
| Thread safe | ✓ |