<Connection variable>.DescribeServerTrigger (Function)

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HFSQL Client/Server functions

DescribeServerTrigger

Presentation

Example

Triggers of the same type

Trigger on the functions for handling the Table controls

Variables used to manage the triggers

See also

ActivateServerTrigger

AddGroup

AddLink

AddScheduledBackup

AddScheduledOptimization

DeactivateServerTrigger

DeleteScheduledBackup

DeleteScheduledOptimization

DescribeServerTrigger

ExecuteScheduledBackup

ListScheduledOptimization

ModifyDatabaseProperty

ModifyScheduledBackup

ModifyScheduledOptimization

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Triggers of the same type
Trigger on the functions for handling the Table controls
Variables used to manage the triggers

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See also

<Connection variable>.DescribeServerTrigger (Function)

In french: <Variable Connexion>.DécritTriggerServeur

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 a HFSQL function is run.

Remark: The functions for handling the server triggers are advanced functions. The server triggers can be created directly in the data model editor. See Server triggers for more details.

Remark: From version 19, HFSQL is the new name of HyperFileSQL.

Versions 22 and later

This function is now available for iPhone/iPad applications.

This function is now available in Universal Windows 10 App mode.

This function is now available in Android Widget mode.

This function is now available for Android applications.

This function is now available for the Java applications.

New in version 22

This function is now available for iPhone/iPad applications.

This function is now available in Universal Windows 10 App mode.

This function is now available in Android Widget mode.

This function is now available for Android applications.

This function is now available for the Java applications.

This function is now available for iPhone/iPad applications.

This function is now available in Universal Windows 10 App mode.

This function is now available in Android Widget mode.

This function is now available for Android applications.

This function is now available for the Java applications.

Example

// Connection
CNT_TEST is Connection

// Create a data file
IF Cedex.Creation() = False THEN
Error(HErrorInfo())
ELSE
Info("File created")
END

// Change data file directory
IF Cedex.ChangeDir(".\FRANCE\") = False THEN Error(HErrorInfo())

// Create a trigger on a HFSQL Client/Server data file
IF CNT_TEST.DescribeServerTrigger("TriggerTEST", ...
"ProcedureTEST", hTriggerAfter, ...
"Cedex", "HAdd, HModify") = False THEN Error(HErrorInfo())

// Add records
Cedex.ZipCode = "30000"
Cedex.City = "NIMES"
Cedex.Add()

Cedex.ZipCode = "34000"
Cedex.City = "MONTPELLIER"
Cedex.Add()

Describing a server trigger on the physical files associated with a connection Hide the details

<Result> = <Connection>.DescribeServerTrigger(<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 occurred. HError is used to identify the error.

<Connection>: Connection variable

Name of the Connection variable that describes the connection to use.

<Trigger>: Character string (with quotes)

Name of the trigger to create. This name will be used to handle the trigger in the functions for managing the 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:
hTriggerBefore The stored procedure is run before the HFSQL function
hTriggerAfter The stored procedure is run after the HFSQL function

<Physical HFSQL Client/Server files>: Optional character string (with quotes)

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 if it corresponds to an empty string (""), the trigger will be enabled on all the data files of the database.

<List of HFSQL functions>: Optional character string (with quotes)

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 (","). Triggers can be defined on the following functions:
<Source>.Modify,
<Source>.Add
<Source>.Delete
<Source>.Write
<Source>.Cross
Triggers are also run on INSERT queries (trigger of <Source>.Add), UPDATE queries (trigger of <Source>.Modify) and DELETE queries (trigger of <Source>.Delete).

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 handling the Table controls

The functions for handling the Table controls (<Table>.Add, <Table>.AddLine, <Table>.Delete, <Table>.Modify, ... ) implicitly use the following HFSQL functions: <Source>.Add, <Source>.Delete and <Source>.Modify.

When using one of these functions for handling the Table controls, if a trigger is defined for the corresponding HFSQL function, the trigger is automatically activated.

Variables used to manage the triggers

A trigger procedure accepts no parameter. However, some HFSQL state variables are positioned before each call:


H.FileName	Character string: Logical name of the data file whose trigger is activated.
H.Action	Character initialized to "A" for a Before trigger and to "P" for an After trigger.
H.TriggerFunction	Character string: Name of HFSQL function that activated the trigger.
H.ToDo	During the execution of the Before trigger, the execution of the current HFSQL function can be canceled by assigning "A" to the HFSQL state variable: H.ToDo = "A"

Remark: If a BEFORE trigger and an AFTER trigger are defined for a HFSQL function and if the BEFORE trigger cancels the function (H.ToDo is set to "A"), then the AFTER trigger is not activated.

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