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OBJECT_ID_FROM_NODE_ID (Transact-SQL)

  • Artikkeli

Applies to: SQL Server 2017 (14.x) and later Azure SQL Database Azure SQL Managed Instance

Returns the object ID for a given graph node ID.

Syntax

OBJECT_ID_FROM_NODE_ID ( node_id )

Arguments

node_id

The character representation (JSON) for one of the following items:

  • The $node_id pseudo-column for a node table.
  • The $from_id pseudo-column for an edge table.
  • The $to_id column for an edge table.

Return value

Returns the object_id for the graph table corresponding to the node_id supplied. object_id is an int. If an invalid node_id is supplied, NULL is returned.

Remarks

  • Owing to the performance overhead of parsing and validating the supplied character representation (JSON) of nodes, you should only use OBJECT_ID_FROM_NODE_ID where needed. In most cases, MATCH should be sufficient for queries over graph tables.
  • For OBJECT_ID_FROM_NODE_ID to return a value, the supplied character representation (JSON) of the node ID must be valid, and the named schema.table within the JSON, must be a valid node table. The graph ID within the character representation (JSON), need not exist in the node table. It can be any valid integer.
  • OBJECT_ID_FROM_NODE_ID is the only supported way to parse the character representation (JSON) of a node ID.

Examples

The following example returns the object_id for all the $from_id nodes in the likes graph edge table. In the SQL Graph Database Sample, we only use the $node_id values from the Person table as the corresponding $from_id values in likes. Therefore, the values returned are constant and equal to the object_id of the Person table (1525580473 in this example).

SELECT OBJECT_ID_FROM_NODE_ID($from_id)
FROM likes;

Here are the results:

...
1525580473
1525580473
1525580473
...

See also