DS_Item

The DS_Item subordinate object is used to define an element in a data source. One is defined for each element. The DS_Item object corresponds to a record in the pvxview.itm file.

For information on the pvxview.itm file structure, see Views System File Structures. Properties are read only and are set using corresponding Setxxx( ) methods.

DS_Item Properties

The following table lists the properties of the DS_Item subordinate object:

Property	Description
Class$	Class of item.
DataType$	Data type: S String data (Default) N Numeric data
Description$	Item description. This value may be prefaced with an = (equals sign), denoting that the description contains an expression rather than a fixed value beginning at the second character.
Expression$	Formula/expression to derive the data.
InternalD$	Internal identifier for the data source element.
Length	Item length ("" null = Default).
Name$	Field or column name (no trailing "$").
ParentSource	Object identifier for the parent data source object.

DS_Item Methods

The following table lists the methods of the DS_Item subordinate object:

Method	Description
Description$( )	Returns the evaluated description.
SetClass(Class$)	Set class of item.
SetType(Type$)	Set data type: S String data N Numeric data
SetDescription(Description$)	(Internal Use Only) Set item description. Use ViewCtl equivalent.
SetExpression(Expression$)	Set formula/expression to derive the data.
SetInternalID(InternalID)	(Internal Use Only) Set internal identifier for the data source element.
SetLength(Length)	Set item length (0 = Default).
SetName(Name$)	Set field or column name (no trailing "$").