- Characteristics of created data file
- Additional files created
- Managing passwords
- Managing fatal errors when creating a data file
- Managing non-Latin character sets
- Replication: Range of identifiers
- Priority for defining the location of log files
- Creating or opening an existing table
- Managing indexes
- Creating the data file from its description
HCreationIfNotFound (Function) In french: HCréationSiInexistant
 Not available with this kind of connection
Performs the following operations: - If the data file does not exist, creates an empty data file (".FIC" extension) with the index file and the memo file if necessary.
The function is equivalent to HCreation. - If the data file exists, opens the data file.
In this case, the function is equivalent to HOpen.
To optimize the call to the HCreationIfNotFoundfunction, the of the data file opening can also be performed only at the first access made on the data file (using the hDelayedOpeningconstant).
// Création de tous les fichiers de données décrits dans l'analyse
// avec le mot de passe "PSW"
HCreationIfNotFound("*", "PSW")
// Création du fichier de données Commande (décrit dans l'analyse)
HCreationIfNotFound(Commande)
Syntax
<Result> = HCreationIfNotFound([<Data file> [, <Password> [, <Path of JNL file> [, <Path of JournalOperation file>]]] [, <Option>]])
<Result>: Boolean - True if the data file was created or opened,
- False if a problem occurred. HError is used to identify the error. If a fatal error occurs, a specific process is required to continue the program and to check whether the data file was created (see the Notes).
<Data file>: Optional character string Name of data file to use.
If this name is not specified, HCreationIfNotFound will use the last data file used by the last HFSQL management function (function starting with "H").
If this parameter is equal to "*", all the data files found in the current analysis will be created or opened. If a password is specified, this password is used for all the data files.
This parameter can also correspond to the name of a group of files (or custom-folder) defined in the analysis (not available in Android and Android widget). If a password is specified, this password is used for all the data files of the group.
Caution: this parameter cannot correspond to an variable of type File description.
 Versions 17 and later New in version 17 <Password>: Optional character string - Password associated with the data file.
- Empty string ("") if no password is used.
<Path of JNL file>: Optional character string Access path to the JNL file associated with the logged data file. This parameter is only taken into account if the data file is logged. In this case, <File name>JNL.fic will be created at the specified location.
<Path of JournalOperation file>: Optional character string Access path to the JournalOperation file and to the JournalIdentification file associated with the logged data file. The JournalOperation file contains all the operations performed on the logged data file. This parameter is only taken into account if the data file is logged.
<Option>: Optional constant Optimize the opening of existing data files. | | | hChangeCharset | The character set defined by ChangeCharset will be taken into account in the new data file. The sorts, the searches, ... on string keys (strings, characters, date and time) will be performed according to this character set. | | hDelayedOpening | If the data file already exists, it will be opened during the first access to the data file. If the data file does not exist, it is created and opened. | | hNoLink | Management of integrity: The links are not updated on the server (creation, modification or deletion).
Reminder: By default, the links are updated on the server when creating a data file.
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Versions 15 and later New in version 15 Remarks Managing passwords The password can be defined: - when the data file is created or opened by HCreationIfNotFound.
- before the data file is created by HPass.Caution: The password is independent of data encryption. The data encryption must be configured during the file description in the data model editor ("Details" tab).
Managing fatal errors when creating a data file If a fatal error occurs when creating a data file, it may be interesting to continue the program while checking whether the data file was created or not. To do so, we recommend that you perform the following exception process:
WHEN EXCEPTION IN
HCreationIfNotFound(PERE)
DO
Error("Erreur HFSQL: " + HError())
ELSE
Trace("fichier créé")
END
Creating the data file from its description The data file can be directly created from its description in the data model editor. To do so, select "Create the data file" from the popup menu of the data file (in the analysis graph) and select the directory in which the data file must be created.
This page is also available for…
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| | //EXEMPLO USE
iniresult is string = INIRead("APP","VERSAO","",fDataDir() + ["\"] +"CONFIG.INI")
IF (Num = 1 AND iniresult = "") OR (Num = 1 AND iniresult = 0) THEN
Info("UMA VEZ")
INIWrite("APP","VERSAO","2",fDataDir() + ["\"] +"CONFIG.INI")
Info(INIRead("VIAVAREJO","VERSAO","","CONFIG.INI"))
fDelete(fDataDir() + ["\"] +"t000_config.fic")
fDelete(fDataDir() + ["\"] +"t000_config.ndx")
fDelete(fDataDir() + ["\"] +"t000_config.mmo")
end
HModifyStructure("*",hmsBackgroundTask) // 1.º CODE ORDER
HCreationIfNotFound("*","app488640") // 2.º CODE ORDER
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