The OPC UA ContentFilterElement. More...
Import Statement: | import QtOpcUa |
Since: | QtOpcUa 5.13 |
A content filter element contains an operator and operands. There are four different operator types which contain literal values, references to attributes of nodes or to other content filter elements.
A combination of one or more content filter elements makes a content filter which is used by the server to filter data for the criteria defined by the content filter elements. For example, the where
clause of an event filter is a content filter which is used to decide if a notification is generated for an event.
QtOpcUa.FilterElement { operator: QtOpcUa.FilterElement.GreaterThanOrEqual firstOperand: QtOpcUa.SimpleAttributeOperand { ... } secondOperand: QtOpcUa.LiteralOperand { ... } }
See also EventFilter.
firstOperand : variant
First operand to be used with the operator. This can be one of SimpleAttributeOperand, AttributeOperand, LiteralOperand or ElementOperand.
operatorType : enumeration
The filter operator.
Possible operators for a FilterElement that are specified in OPC-UA part 4, Tables 115 and 116.
Constant | Value |
---|---|
FilterElement.Equals | |
FilterElement.IsNull | |
FilterElement.GreaterThan | |
FilterElement.LessThan | |
FilterElement.GreaterThanOrEqual | |
FilterElement.LessThanOrEqual | |
FilterElement.Like | |
FilterElement.Not | |
FilterElement.Between | |
FilterElement.InList | |
FilterElement.And | |
FilterElement.Or | |
FilterElement.Cast | |
FilterElement.InView | |
FilterElement.OfType | |
FilterElement.RelatedTo | |
FilterElement.BitwiseAnd | |
FilterElement.BitwiseOr |
secondOperand : variant
Second operand to be used with the operator. This can be one of SimpleAttributeOperand, AttributeOperand, LiteralOperand or ElementOperand.
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Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-6.2/qml-qtopcua-filterelement.html