- Managing the password
- Creating or opening a data file
- Opening a data file that is already opened
- Managing the list of data files used (.REP)
- Managing fatal errors
- Opening a connection and the specified table
HOpen (Function) In french: HOuvre
 Not available with this kind of connection
Opens a data file. Remark: The opening of data files is managed automatically. However, in some cases, you may have to explicitly open a data file (to check the file existence or the password validity for example).
// Open Customer data file
HOpen(Customer)
// Open all data files with the password "PSW".
HOpen("*", "PSW")
// Check status report of HOpen
IF HOpen(Customer, "ABCD", hORead) = False THEN
Error("Unable to open the Customer data file" + HErrorInfo())
END
Syntax
<Result> = HOpen([<Data file> [, <Password>] [, <Access mode>]])
<Result>: Boolean - True if the data file was opened.
- False if a problem occurred (wrong password, ...). HError is used to identify the error. HErrorInfo returns more details.
<Data file>: Optional character string Name of data file used (logical name, defined in the analysis).
If this name is not specified, HOpen will use the last data file used by the last HFSQL function (function starting with "H").
If this parameter is corresponds to "*", all the data files described in the analysis are opened. If the password is specified, this password will be used to open 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 the password is specified, this password will be used to open all the data files of the group.
Caution: this parameter cannot be a variable of type File description. <Password>: Optional character string Password of the data file.
If no password is associated with the data file, you have the ability to use an empty string (""). <Access mode>: Optional integer constant Configures the access mode to the data file.
If this parameter is not specified, the data file will be opened according to its characteristics (if the data file is read-only, it will be opened in read-only ; if the data file is read/write, it will be opened in read/write mode). | | | hORead | The data file can be accessed in read-only. You only have the ability to read the records. No record can be added or deleted. | | hOReadWrite | The data file can be accessed in read/write. You have the ability to read the records and to write new records. |
Remarks Managing the password The password can be specified: - when the data file is opened with HOpen,
- before the data file is opened with HPass.
Creating or opening a data file HCreationIfNotFound can replace HOpen. Indeed, if the data file exists, it is automatically opened. Opening a data file that is already opened If HOpen is used on a data file already opened with a different <Access mode>, the filters, locks and characteristics of the current iteration are lost. Managing the list of data files used (.REP) WINDEV Mobile allows you to update a list of data files used by the application (equivalent to the.REP file in WINDEV). HOpen specifies the list of data files used by the application (.REP for WINDEV and WEBDEV) if updates are enabled for this list. Managing fatal errors If a fatal error occurs when opening a data file, it may be interesting to continue the program while processing the error. To do so, we recommend that you perform the following exception process:
WHEN EXCEPTION IN
HOpen(PARENT)
DO
Error("HFSQL error: " + HError())
ELSE
Trace("File opened")
END
This page is also available for…
|
|
|
|