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Stored procedures
Changes the browse item. The current record is not modified.
After the function is executed, the browse is performed from the current record, according to the new browse item. HChangeKey can be used to start browsing a data file, after being positioned on a record with direct access (with HRead for example).
Remark: This function can be used on a HFSQL data file, query or view.
Versions 15 and later
Android This function is now available for Android applications.
New in version 15
Android This function is now available for Android applications.
Android This function is now available for Android applications.
Versions 17 and later
iPhone/iPad This function is now available for iPhone/iPad applications.
New in version 17
iPhone/iPad This function is now available for iPhone/iPad applications.
iPhone/iPad This function is now available for iPhone/iPad applications.
Versions 18 and later
Android Widget This function is now available in Android Widget mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
New in version 18
Android Widget This function is now available in Android Widget mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Android Widget This function is now available in Android Widget mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Versions 21 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Remark: From version 19, HFSQL is the new name of HyperFileSQL.
// Change the search key
IF HChangeKey(Customer, Name) = False THEN
Error("Select a customer in the table")
END
Syntax
<Result> = HChangeKey(<Data file> [, <Item> [, <Browse mode>]])
<Result>: Boolean
  • True if the search key was modified,
  • False an error occurred (no read function has preceded the change of key...): the search key is not modified. HError is used to identify the error.
<Data file>: Character string (with or without quotes)
Name of data file, HFSQL view or query used.
<Item>: Optional character string (with or without quotes)
Name of the new browse item.
If this name is not specified, HChangeKey will use the last browse item specified by the last HFSQL management function (function starting with "H").
<Browse mode>: Optional Integer constant
Characteristics of the data file browse on the new key:
hKeepFilterThe filter implemented by HFilter will be taken into account, even if the search key is not optimized for the filter.
Reminder: HFilter returns the search key optimized for the filter.
Caution: In this case, performance issues may arise for large data files
Hyper File 5.5 The <Browse mode> parameter cannot be used.
Component : wd250hf.dll
Minimum version required
  • Version 9
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