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  • Enabling and disabling a filter
  • Number of possible active filters
  • Browse
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Stored procedures
Temporarily disables the filter on a data file (view or query). This filter was created by HFilter. HDeactivateFilter has no effect if no filter was declared.
// Declare the filter: select customers
// between 20 and 60 years old
HFilter(Customer, Age_Customer, 20, 60)
...
HDeactivateFilter(Customer) // Disabled filter
...
// Browse the data file with a filter on age
// Process the customers who are between 20 and 60 years old
// (ProcessCustomer2060 procedure)
HActivateFilter(Customer)
HReadFirst(Customer, Age_Customer)
WHILE HFound(Customer) = True
ProcessCustomer2060()
HReadNext(Customer, Age_Customer)
END
Syntax
<Result> = HDeactivateFilter([<Data file>])
<Result>: Boolean
  • True if the filter is disabled,
  • False if an error occurred (data file or item not found).
<Data file>: Optional character string
Name of the data file, view or query used.
If this parameter is not specified, HDeactivateFilter handles the last data file used by the last HFSQL management function (function starting with "H").
Remarks

Enabling and disabling a filter

The filter is enabled once it has been declared (HFilter). A filter disabled by HDeactivateFilter can be re-enabled by HActivateFilter.
Remark: During the call to HClose, the filter enabled by HFilter is automatically deleted.

Number of possible active filters

A single filter can be enabled at a time for a given file.

Browse

The modifications performed by HFilter and HDeactivateFilter are taken into account when using HReadFirst/HFirst, HReadLast/HLast or HReadSeekFirst/HReadSeekLast.
Component: wd270hf.dll
Minimum version required
  • Version 9
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