OB SET NULL

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4D v20 R7

OB SET NULL


OB SET NULL ( object ; property )

Parameter	Type	Description
object	Object, Object Field	Structured object
property	Text	Name of property where null value is to be applied

Description

The OB SET NULL command stores the null value in the language object designated by the object parameter.

object must have been defined using the _O_C_OBJECT command or designate a 4D object field.

In the property parameter, pass the label of the property where you want to store the null value. If the property already exists in object, its value is updated. If it does not exist, it is created.
Note that the property parameter is case sensitive.

Example

We want to put the null value in the "age" property for Lea:

 C_OBJECT($ref)

 OB SET($ref;"name";"Lea";"age";4)

  // $ref = {"name":"Lea","age":4}

 ...

 OB SET NULL($ref ;"age")

  // $ref = {"name":"Lea","age":null}