HVersion (Function)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

This content has been translated automatically. Click here to view the French version.

Help / WLanguage / Managing databases / HFSQL / HFSQL functions

Incrementing the version number of the data file
Multi-file queries

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

HVersion (Function)

In french: HVersion

Not available with this kind of connection

Determines:

whether the content of a data file was modified.
whether the content of a data file used by a query was modified.

This function is used to detect the modifications made to a data file shared among several programs. If a modification is detected, you have the ability to refresh the data displayed in the window or in the page.

Example

NumVer = HVersion(Client)

// Première évaluation de la version du fichier de données
NumVer is int
NumVer = HVersion(Client)
// Traitements
// Deuxième évaluation de la version du fichier de données
IF NumVer <> HVersion(Client) THEN
	Info("Le fichier de données Client a été modifié.")
END

Syntax

<Result> = HVersion([<Data file or query>])

<Result>: Integer

Version number of the data file.
The version number is always equal to 0.

<Data file or query>: Optional character string

Name of the data file used.
Name of the query used.
If this parameter is not specified, HVersion will handle the last data file (last query) used.
The data file used must be an HFSQL data file. Otherwise, the version number is always equal to 0.

Remarks

Incrementing the version number of the data file

When creating the data file, the version number is initialized to 1. This number is incremented whenever the file content is modified (HAdd, HWrite, HModify, TableSave, TableDelete, HFree, HDelete, HCross). The number is incremented if the function is successful.

Note The function HVersion function can be used on both indexed and non-indexed data files.

Multi-file queries

In the case of a multi-file query, HVersion returns the sum of the HVersion of all data files used in the query.

Component: wd300hf.dll