NODE_UUID function

[[node-uuid,NODE_UUID()]]

== NODE_UUID(`expression`)

=== Description

Returns the UUID of a node.

=== Arguments

expression::

A string, or an expression resolving to a string, representing a node name.

To get the UUID of the node on which the query is running, use the empty string `""`.

=== Return Value

A string representing the node UUID.

If the input expression is not a string, the return value is `null`.

If the input expression is `missing`, the return value is also `missing`.

=== Example

[[node-uuid-ex,NODE_UUID() Example]]

====

.Query

[source,sqlpp]

----

SELECT NODE_UUID("") AS from_empty_string,

       NODE_UUID("127.0.0.1:8091") AS from_node_uuid,

       NODE_UUID(NODE_NAME()) AS from_node_uuid_function;

----

.Result

[source,json]

----

[

  {

    "from_empty_string": "b4920c17d0f2a130d4e70fe387637646",

    "from_node_uuid": "b4920c17d0f2a130d4e70fe387637646",

    "from_node_uuid_function": "b4920c17d0f2a130d4e70fe387637646"

  }

]

----

====