Exists
Exists( ref, [ts] )
Exists( ref, [ts] )
Exists( ref, [ts] )
Exists( ref, [ts] )
exists( ref, [ts]
Exists( ref, [ts] )
Description
The Exists
function returns boolean true
if the provided ref exists
at the specified timestamp (in the case of a document), or is non-empty
(in the case of a set), and false
otherwise.
Parameters
Parameter | Type | Definition and Requirements | ||
---|---|---|---|---|
|
The Reference that uniquely identifies a document within the database. |
|||
|
Optional - The timestamp at which the existence of the Reference is checked. Can be expressed as either a number of UNIX microseconds since epoch, or as a Timestamp. Defaults to the current time.
|
Examples
The following query checks for the existence of a ref pointing at a
document in the spells collection at value 181388642046968320L
. Since
this ref is present at the current time, true
is returned.
BooleanV(True)
true
true
true
True
true
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