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New WINDEV, WEBDEV, WINDEV Mobile 25 feature!
  • Management of duplicates enabled
  • Generalizing the check for duplicates
  • Disabling the check for duplicates
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Stored procedures
Enables or disables the management of duplicates on a unique key.
Remarks:
  • The management of duplicates is enabled by default.
  • This function is not available on databases accessed by OLE DB or by Native Connectors (also called Native Accesses).
Versions 18 and later
Universal Windows 10 App This function is now available in Windows Store apps mode.
New in version 18
Universal Windows 10 App This function is now available in Windows Store apps 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.
Versions 22 and later
Java This function is now available for the Java applications.
New in version 22
Java This function is now available for the Java applications.
Java This function is now available for the Java applications.
Example
// Disable the management of duplicates on the Customer data file for the "Name" key
Customer.SetDuplicates(Name, False)
Syntax
<Result> = <Source>.SetDuplicates([<Key item>, ] <Activation>)
<Result>: Boolean
Former management mode of duplicates (before the call to <Source>.SetDuplicates):
  • True if the management of duplicates was enabled,
  • False if the management of duplicates was disabled (or if the specified key is a key with duplicates).
If <Key item> = "*", <Result> is set to True if the check for duplicates was enabled for at least one item in the former management mode of duplicates.
<Source>: Type corresponding to the specified source
Name of data file used.
<Key item>: Optional character string (with or without quotes)
Name of unique key item used.
If this parameter is not specified or if it corresponds to "*", the management of duplicates is taken into account for all the key items in the specified data file.
<Activation>: Boolean
Management mode:
  • True if the management of duplicates must be enabled on the item,
  • False if this management must be disabled.
Remarks

Management of duplicates enabled

If the management of duplicates is enabled on a key defined as unique key, the uniqueness is automatically checked whenever a record is added or modified in the data file.
Therefore, if the uniqueness is not checked during an addition (<Source>.Add) or a modification (<Source>.Modify), the record is not added/modified, the addition/modification function returns an error and HErrorDuplicates returns True.
Remark: Only <Source>.Add and <Source>.Modify can generate a duplicate error.

Generalizing the check for duplicates

To generalize the management mode of duplicates to all the items found in a data file, use the meta-character "*".
For example:
<Data file>.SetDuplicates("*", <Activation>)

Disabling the check for duplicates

Disabling the check for duplicates means the possibility not to comply with the uniqueness rules specified during the description of the data files in the data model editor. Therefore, disabling the check for duplicates must be done with great care: it must be used advisedly.
Component : wd250hf.dll
Minimum version required
  • Version 25
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