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- Deleting records from a query
- Deleting records from an HFSQL view
- Deleting records from a transaction
- Benefits compared to a loop for deleting records
- Advantage compared to .Creation
<Source>.DeleteAll (Function) In french: <Source>.SupprimeTout
 Not available with this kind of connection
Deletes all records from a data file, an HFSQL view or a query. The records are deleted logically and physically. They cannot be restored. The following operations are performed: - the records are deleted: the records are not referenced in the index anymore. The data is not kept.
- the indexes (corresponding to the keys of the records) are deleted from the index file.
- the memos associated with the records are deleted from the memo file.
- the automatic identifiers are re-initialized.
Caution: the integrity is not checked. WINDEV, WINDEV Mobile and WEBDEV propose an automatic management of errors for the following types of errors: Duplicate error, integrity error, password error, modification conflict error and status error during modification conflict, lock error. For more details, see Assisted HFSQL error handling. // Clear data file without re-creating it
Customer.DeleteAll()
Syntax
<Result> = <Source>.DeleteAll()
<Result>: Boolean - True if the records have been deleted,
- False if a problem occurred (locked record, record in transaction, ...). HErrorInfo is used to identify the error.
<Source>: Type corresponding to the specified source Name of HFSQL data file, HFSQL view or query used. Remarks Deleting records from a query If the query was created by using the hModifyFile constant, <Source>.DeleteAll deletes the records from the source of the query. Deleting records from an HFSQL view <Source>.DeleteAll deletes the records from the view but it does not delete the records from the data file used for the view. Deleting records from a transaction <Source>.DeleteAll does not delete the records found in a transaction (canceled or validated). Benefits compared to a loop for deleting records To delete the records from a data file, you can also set a loop for deleting the records ( <Source>.Delete). For example:
FOR EACH CustNum OF Orders
Order.Delete()
END
Using <Source>.DeleteAll has the following advantages: - the process is faster,
- the size of empty data file is smaller.
Advantage compared to <Source>.Creation To delete the records from a data file, you also have the ability to use <Source>.Creation. Using <Source>.DeleteAll has the following advantages: - Deletion possible even if users are connected to the data file.
- Automatic management of HFSQL errors.
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