This is the legacy 4D documentation web site. Documentations are progressively being moved to developer.4d.com
- 4D Language Reference
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- Database Methods
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Database Methods
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On Backup Shutdown database method
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On Backup Startup database method
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On Drop database method
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On Exit database method
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On Host Database Event database method
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On Mobile App Action database method
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On Mobile App Authentication database method
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On REST Authentication database method
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On Server Close Connection database method
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On Server Open Connection database method
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On Server Shutdown database method
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On Server Startup database method
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On SQL Authentication database method
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On Startup database method
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On System Event database method
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On Web Authentication database method
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On Web Connection database method
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On Web Legacy Close Session database method
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On Startup database method
| On Startup database method | ||||||||
| Does not require any parameters | ||||||||
The On Startup database method is called once when you open a database.
This occurs in the following 4D environments:
- 4D in local mode
- 4D in remote mode (on the client side, after the connection has been accepted by 4D Server)
- 4D application compiled and merged with 4D Volume Desktop
Note: The On Startup database method is NOT invoked by 4D Server.
The On Startup database method is automatically invoked by 4D; unlike project methods, you cannot call this database method yourself by programming. You can however execute it from the Method editor. You can also use subroutines.
The On Startup database method is the perfect place to:
- Initialize interprocess variables that you will use during the whole working session.
- Start processes automatically when a database is opened.
- Load Preferences or Settings saved for this purpose during the previous working session.
- Prevent the opening of the database if a condition is not met (i.e., missing system resources) by explicitly calling QUIT 4D.
- Perform any other actions that you want to be performed automatically each time a database is opened.
However, we strongly recommend that you do NOT launch print jobs from the On Startup database method.
See the example in the Semaphore section.
Product: 4D
Theme: Database Methods
Number:
905263
4D Language Reference ( 4D v20)
4D Language Reference ( 4D v20.1)
4D Language Reference ( 4D v20.2)
4D Language Reference ( 4D v20.3)
4D Language Reference ( 4D v20.4)
4D Language Reference ( 4D v20.5)
4D Language Reference ( 4D v20.6)
