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- Conditions for using <Source>.CancelDeclaration
- <Source>.CancelDeclaration and closing the data file
<Source>.CancelDeclaration (Función)
 No disponible con este tipo de conexión
Customer.Close()
Customer.CancelDeclaration()
Sintaxis
<Result> = <Source>.CancelDeclaration()
<Result>: booleano - True if the operation was performed,
- False if a problem occurs. HError is used to identify the error.
<Source>: Tipo de fuente especificada Corresponds to: - the name of data file (defined in the analysis). If this name is not specified, <Source>.CancelDeclaration handles the last data file used.
- the name of query or data source associated with a query (when freeing resources once <Source>.ExecuteQuery or <Source>.ExecuteSQLQuery has been used).
Observaciones Conditions for using <Source>.CancelDeclaration This function must be used ONLY when the relevant data file (or query) is not used anymore! In the following example, the <Source>.CancelDeclaration function is used too early: the contents of the Table control will be completely distorted.. The Table control is populated using BuildBrowsingTable in a parallel process in the background. Therefore, <Source>.CancelDeclaration will be called before the table is entirely filled, making this table unusable. HExecuteSQLQuery("test", "select * from customer")
BuildBrowsingTable(TABLE_Table1, "test")
HCancelDeclaration("test")
The problem can also occur with a variable of type "data source". A "data source" variable declared locally in a process or event (button click, procedure, method, etc.) ONLY exists while this code is run. For this reason, a "warning" is displayed if you use this type of data source: "the data source will be destroyed at the end of this code". <Source>.CancelDeclaration and closing the data file To use <Source>.CancelDeclaration on a data file, this data file must be closed. If a query, a subquery or a view uses the data file, <Source>.CancelDeclaration cannot be executed, even after calling <Fuente>.Close. The queries or views that are using the data file must be freed beforehand.
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