Respond to creation of a new node.
This hook is invoked only on the module that defines the node's content type (use hook_node_insert() to act on all node insertions).
This hook is invoked from node_save() after the node is inserted into the node table in the database, before field_attach_insert() is called, and before hook_node_insert() is invoked.
Drupal\node\Node $node: The node that is being created.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_insert(Drupal\node\Node $node) {
db_insert('mytable')
->fields(array(
'nid' => $node->nid,
'extra' => $node->extra,
))
->execute();
}