Unalterable (Property)

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Unalterable (Property)

In french: Inaltérable

Available only with these kinds of connection

The property Unalterable property is used to set the inalterability of a data file: the data file cannot be modified; only additions are possible.

You can:

Find out whether a data file is unalterable or not (data file defined in the data model editor or through programming).
Define the characteristics regarding the unalterability of a data file (when describing the data file through programming only).

Reminder: The inalterability of files:

avoids programming errors by preventing modification or deletion (via HModify/HDelete, or via a query).
adds a hash of the record content to each record. This hash is an HMAC-SHA256 hash, whose key is derived from the file encryption password.

Example

UnFichier is File Description
UneRubrique is Item Description

// Description du fichier de données "Client"
UnFichier.Name = "Client"
UnFichier.Type = hFileNormal
UnFichier.Unalterable = True

// Description de la rubrique 
UneRubrique.Name = "Message"
UneRubrique.Type = hItemText
UneRubrique.Size = 40
HDescribeItem(UnFichier, UneRubrique)

// Valide la description du fichier de données 
HDescribeFile(UnFichier)

Syntax

Finding out whether a data file is unalterable or not Hide the details

<Result> = <Data file>.Unalterable

<Result>: Boolean

True if the data file is unalterable,
False otherwise.

<Data file>: Character string

Name of the data file used. This name was defined in the data model editor or with the File Description type.

Defining the characteristics regarding the unalterability of a data file (data file defined through programming) Hide the details

<Data file>.Unalterable = <Unalterability>

<Data file>: Character string

Name of the data file used. This name is defined with the File Description type.

<Unalterability>: Boolean

True if the data file must be unalterable,
False otherwise.