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xpfTestAttrBN

xpfTestAttrBN

Owned by Former user (Deleted)
Last updated: May 10, 2018 by Former user (Deleted)
FUNCTION xpfTestAttrBN (instanceId    : GENERIC;
                        attributeName : STRING) 
                        isSet         : BOOLEAN;

The xpfTestAttrBN function returns TRUE if the specified attribute attributeName in the specified instance instanceId has a value, else the function returns FALSE. An attribute is assigned a value by a put function like xpxPutAttrBN, xpxPutAttrsBN etc.

Arguments

TypeNameComment
GENERICinstanceIdUnique id of an instance within the EDMdatabase
STRINGattributeNameThe name of an attribute of the given instance

Return Value

 

TypeNameComment
BOOLEANisSetTRUE if the attributeName has a value else FALSE

Options

 

Example

IF NOT xpfTestAttrBN(user,'password') THEN -- unsafe, mistype in attribute name can not be found in compile time
	user.password := default_password;
END_IF;
-- it is preferable to code the checking like this:
IF NOT EXISTS(user.password) THEN
	user.password := default_password;
END_IF;

 

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