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HModifyStructure (Function) In french: HModifieStructure
  Available only with these kinds of connection
Allows you to update the structure of an HFSQL data file by performing an automatic data modification (also called Synchronization of the Structure of Deployed Data). Attention: Links are not managed (no creation or update of existing links). To update links, use HUpdateLink.
HModifyStructure(Customer, hmsBackgroundTask)
Syntax
<Result> = HModifyStructure(<Data file> [, <Option> [, <New password> [, <Backup> [, <Progress Bar>]]]])
<Result>: Boolean - True if the automatic data modification was performed,
- False otherwise. ErrorInfo and HErrorInfo are used to identify the error.
<Data file>: Character string Name of data file (defined in the analysis) whose structure must be updated.
If this parameter is equal to "*", the automatic data modification will be applied to all the known data files (described in the analysis).
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). <Option>: Optional constant (or combination of constants) Options for the automatic data modification: | | | hmsBackgroundTask | A hot automatic modification is performed (available for the HFSQL Client/Server data files only). | | hmsNoCheck | The automatic data modification is performed even if:- the description of the file is more recent than the description of the analysis,
- the GUID of the file differs from the GUID of the analysis.
| hmsNormal
(Default value) | Default operating mode of the automatic data modification. |  New in version 2025hmsSavegardeJournal | The following steps are performed during automatic data modification: - Backup log files (in log file backup directory).
- Deleting log files.
- Start automatic data modification.
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Note: In hmsNormal or hmsWithoutControlmode, the data file being handled must not be opened (by the application or by another application).. <New password>: Optional character string or secret string - New password of the data file.
- Empty string ("") to delete the password.
If this parameter is not specified (or if this parameter corresponds to NULL), the existing password is not modified. New in version 2025Secret strings: If you use the secret string vault, the type of secret string used for this parameter must be "Ansi or Unicode string". To learn more about secret strings and how to use the vault, see Secret string vault.
<Backup>: Optional character string - Backup directory.
- Empty string ("") to perform no backup (default value).
<Progress Bar>: Optional control name or window name Name of the Progress Bar control or name of the window that shows the progress of the automatic data modification.
Remarks Password If HModifyStructure is the first function that handles the specified data file, the password is checked when using the data file. This password must have been specified by HPass. If the password is incorrect: Business / UI classification: Business Logic
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