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DS_Item |
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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.
The following table lists the properties of the DS_Item subordinate object:
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Property |
Description | ||||
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Class$ |
Class of item. | ||||
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DataType$ |
Data type:
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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. | ||||
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Expression$ |
Formula/expression to derive the data. | ||||
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InternalD$ |
Internal identifier for the data source element. | ||||
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Length |
Item length ("" null = Default). | ||||
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Name$ |
Field or column name (no trailing "$"). | ||||
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ParentSource |
Object identifier for the parent data source object. |
The following table lists the methods of the DS_Item subordinate object:
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Method |
Description | ||||
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Description$( ) |
Returns the evaluated description. | ||||
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SetClass(Class$) |
Set class of item. | ||||
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SetType(Type$) |
Set data type:
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SetDescription(Description$) |
(Internal Use Only) Set item description. Use ViewCtl equivalent. | ||||
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SetExpression(Expression$) |
Set formula/expression to derive the data. | ||||
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SetInternalID(InternalID) |
(Internal Use Only) Set internal identifier for the data source element. | ||||
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SetLength(Length) |
Set item length (0 = Default). | ||||
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SetName(Name$) |
Set field or column name (no trailing "$"). |