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OBJECT_ID_FROM_EDGE_ID (Transact-SQL)

  • Článok

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

Returns the object ID for a given graph edge ID.

Syntax

OBJECT_ID_FROM_EDGE_ID ( edge_id )

Arguments

edge_id

The $edge_id pseudo-column in a graph edge table.

Return value

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

Remarks

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

Examples

The following example returns the object_id for all the $edge_id nodes in the likes graph edge table. In the SQL Graph Database Sample, the values returned are constant and equal to the object_id of the likes table (978102525 in this example).

SELECT OBJECT_ID_FROM_EDGE_ID($from_id)
FROM likes;

Here are the results:

...
978102525
978102525
978102525
...

See also