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- 4D Language Reference
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- 4D Environment
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System Variables
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Application file
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Application type
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Application version
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BUILD APPLICATION
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Compact data file
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COMPONENT LIST
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CREATE DATA FILE
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Data file
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DROP REMOTE USER
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Export structure file
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Get 4D file
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Get 4D folder
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Get application info
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Get database localization
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Get database measures
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Get database parameter
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Get last update log path
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Get table fragmentation
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Is compiled mode
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Is data file locked
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NOTIFY RESOURCES FOLDER MODIFICATION
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OPEN ADMINISTRATION WINDOW
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OPEN DATA FILE
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OPEN DATABASE
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OPEN RUNTIME EXPLORER
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OPEN SECURITY CENTER
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OPEN SETTINGS WINDOW
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PLUGIN LIST
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QUIT 4D
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REJECT NEW REMOTE CONNECTIONS
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RELOAD PROJECT
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RESTART 4D
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SEND MESSAGE TO REMOTE USER
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SET DATABASE LOCALIZATION
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SET DATABASE PARAMETER
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SET UPDATE FOLDER
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Structure file
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VERIFY CURRENT DATA FILE
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VERIFY DATA FILE
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Version type
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Is data file locked
| Is data file locked -> Function result | ||||||||
| Parameter | Type | Description | ||||||
| Function result | Boolean |
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True = file/segment locked False = file/segment not locked | |||||
The 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.
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
Product: 4D
Theme: 4D Environment
Number:
716
Created: 4D 2003
4D Language Reference ( 4D v20 R7)
