- 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
<Source>.CreationIfNotFound (Function) In french: <Source>.CréationSiInexistant
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 <Source>.Creation. - If the data file exists, opens the data file.
In this case, the function is equivalent to <Source>.Open. To optimize the call to <Source>.CreationIfNotFound, the file can also be opened when accessing the data file for the first time (using the hDelayedOpening constant).
// Create the Orders data file (described in the analysis) Customer.CreationIfNotFound()
Syntax
<Result> = <Source>.CreationIfNotFound([<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).
<Source>: Type corresponding to the specified source Name of data file to use. Versions 17 and later New in version 17 <Password>: Optional character string (with quotes) - Password associated with the data file.
- Empty string ("") if no password is used.
<Path of JNL file>: Optional character string (with quotes) 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 (with quotes) 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.
|
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 <Source>.CreationIfNotFound.
- before the data file is created by <Source>.Password.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 Parent.CreationIfNotFound() DO Error("HFSQL error: " + HError()) ELSE Trace("The file is created") 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…
|
|
|