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- Displaying the result in a List Box or Combo Box control
- Extracting information from the result
HListKey (Function) In french: HListeClé
 Not available with this kind of connection
Returns the list of keys in a data file (query or view) recognized by the HFSQL engine. You can determine: - the type of key,
- its size,
- whether the key is unique or with duplicates, etc.
The files defined by HDeclare, HDeclareExternal and HDescribeFile are taken into account.
KeyList is string
KeyList = HListKey(Customer, hLstDetail)
ListAdd(COMBO_COMBO1, KeyList)
Syntax
<Result> = HListKey(<Data file> [, <Path of the WDD file> [, <Password of the WDD file> [, <Options>]]])
<Result>: Character string List of items found in the specified data file. The different descriptions of each key are separated by CR characters (Carriage Return). The listed keys are sorted according to the physical order of the keys in the data file (except if the hLstSorted constant is used).The result is more or less detailed depending on the constant used:
| | | hLstDetail is not specified | <Name of key 1> + CR + <Name of key 2 + CR + ...
The result is identical with hLstKey and/or hLstCompositeKey and/or hLstSorted. | | hLstDetail is specified | <Name of key 1> + TAB + <Type> + TAB+ <Size> + TAB + <Expression> + TAB + <Unique> + TAB + <Caption> + CR +... | | hLstDetailPlus | <Name of key 1> + TAB + <Type> + TAB + <Size> + TAB + <Expression> + TAB + <Unique> + TAB + <Caption> + TAB + <Integer part of numeric keys> + TAB + <Decimal part of numeric keys> + CR +... |
Where:- <Name of key X>: name of the key.
- <Type>: type of key: "T" for text (and currency) or "N" for numeric.
- <Size>: item size.
- <Expression>: expression of the key for a composite key (for a simple key, only the key name is returned).
- <Unique>:
- "2" for primary keys.
- "1" for a unique key,
- "0" for a key with duplicates.
- <Caption>: caption of the key.
- <Integer part of numeric keys>: number of digits in the integer part of numeric keys.
- <Decimal part of numeric keys>: number of digits in the decimal part of numeric keys.
<Data file>: Character string Name of data file (query or view) whose keys will be listed.If a query name is specified, the query must be running ( HExecuteQuery or HExecuteSQLQuery) to use HListKey. Otherwise, a WLanguage error occurs. <Path of the WDD file>: Optional character string Full path of the analysis (i.e. the .WDD file) in which the data file has been defined.
If this parameter is not specified or is an empty string (""), the data file is searched for in the current analysis. <Password of the WDD file>: Optional character string Password defined for the analysis.
If no password is defined, this parameter must be equal to an empty string (""). <Options>: Optional Integer constant (or combination of constants) Type of list to perform:
| | | hLstAll | Lists all the keys (hLstKey + hLstCompositeKey).
| | hLstCompositeKey | Lists the composite key items only.
| | hLstDetail | Detailed information (idem WINDEV 5.5). | | hLstDetailPlus | For the numeric keys, add the number of digits found in the integer part and in the decimal part.
| | hLstKey | Lists the key items (non-composite keys only).
| | hLstLogicalOrder | Sorts the list in logical order of items (ignored if hLstSorted is specified).
| hLstNormal
(default value) | Corresponds to hLstAll. Value used by default if the hLstKey, hLstCompositeKey and hLstAll constants are not used. | | hLstOriginalItem | Used on a log file (xxxJNL.fic), lists the keys of the initial source file (that was logged). For example, on CustomerJNL.Fic, list the key items of CUSTOMER file.
| | hLstSorted | Sorts the list in ascending order.
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Remarks Displaying the result in a List Box or Combo Box control <Result> can be directly assigned to a List Box or Combo Box control by ListAdd. Each row will contain the name of one of the keys found. Extracting information from the result To extract information from the detailed result, it is recommended to use ExtractString.
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