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- Triggers of the same type
- Trigger on the functions for manipulating Table controls
- Variables used to manage the triggers
HDescribeServerTrigger (Function) In french: HDécritTriggerServeur
 Available only with this kind of connection
Adds or modifies a server trigger. A server trigger is a stored procedure automatically called by the HFSQL engine whenever an HFSQL function is run. Note Server trigger manipulation functions are advanced functions. The server triggers can be created directly in the data model editor. For more details, see Server triggers.
IF HCreation(Cedex) = False THEN
Error(HErrorInfo())
ELSE
Info("Fichier de données créé")
END
IF HChangeDir(Cedex, ".\FRANCE\") = False THEN Error(HErrorInfo())
IF HDescribeServerTrigger("CNX_TEST", "TriggerTEST", "ProcedureTEST", hTriggerAfter, ...
"Cedex", "HAjoute, HModifie") = False THEN Error(HErrorInfo())
Cedex.CodePostal = "30000"
Cedex.Ville = "NIMES"
HAdd(Cedex)
Cedex.CodePostal = "34000"
Cedex.Ville = "MONTPELLIER"
HAdd(Cedex)
Syntax
Describing a server trigger (logical files) Hide the details
<Result> = HDescribeServerTrigger(<Trigger> , <Stored procedure> , <Type of trigger> , <Logical HFSQL Client/Server files> [, <List of HFSQL functions>])
<Result>: Boolean - True if the operation was performed,
- False if a problem occurs. HErrorInfo is used to identify the error.
<Trigger>: Character string Name of the trigger to create. This name will be used to handle the trigger in the functions for managing server triggers. <Stored procedure>: Procedure name Name of the WLanguage stored procedure that will be run when activating the trigger. This procedure accepts no parameter. <Type of trigger>: Integer constant Indicates the type of trigger. | | | hTriggerAfter | The stored procedure is run after the HFSQL function. | | hTriggerBefore | The stored procedure is run before the HFSQL function. |
<Logical HFSQL Client/Server files>: Character string Logical name of one or more HFSQL Client/Server data files. To specify several names, the names of the data files must be separated by a comma (","). <List of HFSQL functions>: Optional character string Name of one or more HFSQL or TableXXX functions on which the trigger must be implemented. To specify several names of functions, the names of functions must be separated by a comma (","). You have the ability to define triggers on the following functions:Triggers are also run on INSERT queries (trigger of HAdd), UPDATE queries (trigger of HModify) and DELETE queries (trigger of HDelete).
Describing a server trigger on the physical files associated with a connection Hide the details
<Result> = HDescribeServerTrigger(<Connection> , <Trigger> , <Stored procedure> , <Type of trigger> [, <Physical HFSQL Client/Server files> [, <List of HFSQL functions>]])
<Result>: Boolean - True if the operation was performed,
- False if a problem occurs. HError is used to identify the error.
<Connection>: Character string or Connection variable Connection to use. This connection corresponds to: <Trigger>: Character string Name of the trigger to create. This name will be used to handle the trigger in the functions for managing server triggers. <Stored procedure>: Procedure name Name of the WLanguage stored procedure that will be run when activating the trigger. This procedure accepts no parameter. <Type of trigger>: Integer constant Type of trigger to create: | | | hTriggerAfter | The stored procedure is run after the HFSQL function | | hTriggerBefore | The stored procedure is run before the HFSQL function |
<Physical HFSQL Client/Server files>: Optional character string Physical name of one or more HFSQL Client/Server data files associated with the connection ("CUSTOMER.FIC" for example). To specify several names, the names of the data files must be separated by a comma (","). If this parameter is not specified or is an empty string (""), the trigger will be enabled on all the data files of the database. <List of HFSQL functions>: Optional character string Name of one or more HFSQL or TableXXX functions on which the trigger must be implemented. To specify several names of functions, the names of functions must be separated by a comma (","). You have the ability to define triggers on the following functions: Triggers are also run on INSERT queries (trigger of HAdd), UPDATE queries (trigger of HModify) and DELETE queries (trigger of HDelete).
Creating a trigger from the description in the analysis Hide the details
<Result> = HDescribeServerTrigger(<Connection> , <Trigger>)
<Result>: Boolean - True if the operation was performed,
- False if a problem occurs. HError is used to identify the error.
<Connection>: Character string or Connection variable Connection to use. This connection corresponds to: <Trigger>: Character string Name of the trigger described in the analysis. Remarks Triggers of the same type If several triggers of the same type are defined on the same data file for the same operation, these triggers will be run according to the alphabetical order of their names. Trigger on the functions for manipulating Table controls When using one of these functions for manipulating Table controls, if a trigger is defined for the corresponding HFSQL function, the trigger is automatically activated. Variables used to manage the triggers A procedure (or stored procedure) of the trigger type receives no parameters. However, some HFSQL state variables are positioned before each call: | | | H.FileName | Character string: Logical name of the data file for which the trigger is activated. Warning Depending on the logical name used by the application, the value of the variable H.FileName variable may be different (using aliases, for example). It is recommended to use: - MyFile.DescribedName to find out the logical name of the data file being manipulated (without taking aliases into account).
- MyFile.PhysicalName to find out the physical name of the data file being manipulated.
| | H.Action | Character initialized to "A" for a Before trigger and to "P" for an After trigger. | | H.TriggerFunction | String: Name of the HFSQL function that triggered the trigger.
 Warning
The Variable H.FunctionTrigger is deprecated in favour of the variable H.FunctionTriggerNumber. The information given by the Variable is independent of the language used to run the application.
|  New in version 2025H.TriggerFunctionNumber | Constant used to identify the function that triggered the trigger: - htrgHAjoute The function that triggered the trigger is HAdd.
- htrgHEcrit The function that triggered the trigger is HWrite.
- htrgHModifies The function that triggered the trigger is HModify.
- htrgHRaye The function that triggered the trigger is HCross.
- htrgHSuppresses The function that triggered the trigger is HDelete.
| | H.ToDo | During the execution of a before trigger:- cancelling the execution of the current HFSQL function by assigning "A" to the HFSQL state variable: H.ToDo = "A". In this case, the action is not performed and the function (HAdd, HModify, etc.) returns True (no error).
- cancelling the execution of the ongoing HFSQL function by assigning "E" to the HFSQL state variable: H.AFaire = "E". In this case, the action is not performed and the function (HAdd, HModify, etc.) returns False. The error message reads: "Action on data file XXX has been interrupted by the trigger".
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Note In the case where a "BEFORE" and an "AFTER" trigger are associated with an HFSQL function, if the "BEFORE" trigger cancels the execution of the HFSQL function (by setting H.AFaire to "A"), the "AFTER" trigger is not triggered. Business / UI classification: Business Logic
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