[This topic is pre-release documentation and is subject to change in future releases. Blank topics are included as placeholders.]
Check if the fields identified by the field names both exists according to the schema.
Namespace: net.esper.view
Assembly:
NEsper (in NEsper.dll)
Syntax
Visual Basic (Declaration) |
---|
Public Shared Function Exists ( _
type As EventType, _
fieldNameOne As String, _
fieldNameTwo As String _
) As String |
Parameters
- type
- net.esper.events.EventType
contains metadata about fields
- fieldNameOne
- System.String
is the first field's field name to test
- fieldNameTwo
- System.String
is the first field's field name to test
Return Value
a String error message if either of the fields doesn't exist, or null to indicate success