[This topic is pre-release documentation and is subject to change in future releases. Blank topics are included as placeholders.]

Check if the field identified by the field name 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, _
	fieldName As String _
) As String
C#
public static string Exists (
	EventType type,
	string fieldName
)
Visual C++
public:
static String^ Exists (
	EventType^ type, 
	String^ fieldName
)

Parameters

type
net.esper.events.EventType
contains metadata about fields
fieldName
System.String
is the field's field name to test

Return Value

a String error message if the field doesn't exist, or null to indicate success