PC SOFT

WINDEVWEBDEV AND WINDEV MOBILE
ONLINE HELP

Home | Sign in | English UK

This content comes from an automatic translation.
  • Multiple changes of directory
  • Changing the name of data file
  • Substituting directories
  • Various
WINDEV
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WEBDEV
WindowsLinuxPHPWEBDEV - Browser code
WINDEV Mobile
AndroidAndroid Widget iPhone/iPadApple WatchUniversal Windows 10 AppWindows Mobile
Others
Stored procedures
  • Modifies the access path to a data file (which means the directory where the data file will be used). If the data file is opened when using HChangeDir, the data file is automatically closed.
    Reminder: By default, the physical file corresponding to the data file described in the analysis is handled in the directory specified in the analysis.
  • Changes the name of database associated with a table. In this case, the database name specified in the connection properties of table (in the data model editor) is ignored.
    To modify the connection parameters of a data file not in HFSQL format, we recommend that you use HDescribeConnection and HChangeConnection.
Remark: From version 19, HFSQL is the new name of HyperFileSQL.
Example
WEBDEV - Server codeAjaxHFSQLHyper File 5.5
// Creation of data file HFSQL Classic Stat in the directory
// "C:\Statistics\January"
HChangeDir(Stat, "C:\Statistics\January")
HCreation(Stat)
WEBDEV - Server codeAjaxHFSQL Client/Server
// Creating the data file HFSQL Client/Server Stat in the directory
// This directory is at the root
// of database folder (HFSQL Client/Server connection)
HChangeDir(Stat, ".\January\")
WEBDEV - Server codeAjaxOLE DBNative Connectors (Native Accesses)
// Data file associated with a connection by OLE DB.
// Replace the database that will be used for the "Customers" table
HChangeDir(Customers, "C:\Temp\MyTestDB.mdb")
HCreation(Customers)
// The "Customers" table was created in the "c:\temp\mytestdb.mdb" database
// The "Customers" table of database ("c:\temp\myinitialdb.mdb") was not modified
Syntax
WEBDEV - Server codeAjaxHFSQLHFSQL Client/ServerHyper File 5.5

With HFSQL data files Hide the details

<Result> = HChangeDir(<Logical file name> , <New file path>)
<Result>: Boolean
  • True if the operation was performed,
  • False if a problem occurred. HError is used to identify the error.
<Logical file name>: Character string (with or without quotes)
Logical name of HFSQL data file (defined in the analysis).
If this parameter is equal to "*", the change of directory will be applied to all known data files (described in the analysis).
This parameter can also correspond to the name of a group of data files (or custom-folder) defined in the analysis.
<New file path>: Character string (with quotes)
Access path to data file (up to 260 characters). This path can contain the name of drive and directories, or it can be a relative path.
If the path is a relative path, the "." (or "?") character is used to specify the current directory and the ".." character is used to specify the parent directory.
If this parameter corresponds to an empty string (""), the data file will be handled in the directory specified in the analysis.
HFSQL Client/Server The access path to the data file must be relative to the database found on the server. You cannot specify a path outside the database. A WLanguage error occurs when attempting to access data files outside the database. For example:
Valid path:
HChangeDir(FileName, "SUBDIR")
 
OR
 
HChangeDir(FileName, ".\SUBDIR")

Invalid path:
HChangeDir(FileName, "C:\DB\SUBDIR")

The new path will be automatically created if it is valid and if it does not exist.

With HFSQL data files Hide the details

<Result> = HChangeDir(<Data file> , <New path of the data file>)
<Result>: Boolean
  • True if the operation was performed,
  • False if a problem occurred. HError is used to identify the error.
<Data file>: Character string (with or without quotes)
Logical name of HFSQL data file (defined in the analysis).
If this parameter is equal to "*", the change of directory will be applied to all 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).
<New path of the data file>: Character string (with quotes)
New path for access to the data file (260 characters maximum). This path can contain the name of drive and directories, or it can be a relative path.
If the path is a relative path, the "." (or "?") character is used to specify the current directory and the ".." character is used to specify the parent directory.
If this parameter corresponds to an empty string (""), the data file will be handled in the directory specified in the analysis.
HFSQL Client/Server The access path to the data file must be relative to the database found on the server. You cannot specify a path outside the database. A WLanguage error occurs when attempting to access data files outside the database. For example:
Valid path:
HChangeDir(FileName, "SUBDIR")
 
OR
 
HChangeDir(FileName, ".\SUBDIR")

Invalid path:
HChangeDir(FileName, "C:\DB\SUBDIR")

The new path will be automatically created if it is valid and if it does not exist.
WEBDEV - Server codeAjaxOLE DBNative Connectors (Native Accesses)

With an OLE DB access or a Native Connector (also called Native Access) Hide the details

<Result> = HChangeDir(<Data file> , <New database>)
<Result>: Boolean
  • True if the operation was performed,
  • False if a problem occurred. HError is used to identify the error.
<Data file>: Character string (with or without quotes)
Logical name of table (defined in the analysis).
If this parameter is equal to "*", HChangeDir is ignored.
Caution: If this parameter is equal to "*" and if one of the data files found in the analysis was associated with a connection (HChangeConnection) before the call to HChangeDir, the directory modification will be taken into account for this data file when closing the connection.
<New database>: Character string (with quotes)
Access path to database to use (up to 260 characters). In this case, the database name specified in the connection properties of table in the analysis is ignored.
This path can contain the name of drive and directories, or it can be a relative path.
If the path is a relative path, the "." (or "?") character is used to specify the current directory and the ".." character is used to specify the parent directory.
Remarks

Multiple changes of directory

HChangeDir can be called several times with different parameters. When the path is redefined several times for the same data file, the last specified path replaces all the other ones.

Changing the name of data file

The function HChangeDir only allows you to change the access path to the physical data file. To change the physical name of data file, use the HChangeName function.

Substituting directories

HChangeDir is used to associate a directory with a data file. To substitute a directory for another one, use HSubstDir.
Caution: The substitution of directory performed by HSubstDir applies to the directory defined by HChangeDir. For example:
HSubstDir("C:\Statistics\January", "C:\New\JanStats")
HChangeDir(Stat, "C:\Statistics\January")
HCreation(Stat) // File created in C:\New\JanStats

Various

  • If the management of ".REP" is enabled (HSetREP), the modification of the path is saved in the ".REP" file (see management of .REP).
  • Closing the data file stores the new path but does not store a possible password specified when opening the data file.
  • HChangeDir is equivalent to HAssign available in the earlier versions.
  • This function can be used when establishing a connection with a HFSQL server.  Caution: The order in which the functions for connecting to a HFSQL Client/Server database are called is important. See Optimizing the connection times to the HFSQL Client/Server databases for more details.
  • Native Connectors (Native Accesses) HChangeDir can be used with the Native XML Access.
Component : wd250hf.dll
Minimum version required
  • Version 9
This page is also available for…
Comments
Click [Add] to post a comment