linkUpdating Nodes

A QueryRunner instance can be used for editing nodes from Objects. The node properties to update, a optional label, and an optional where param are needed.

1link/* --> let 'queryRunner' be a QueryRunner instance */

2linkconst result = await queryRunner.update({

3link    /* --> the matched nodes will be updated with the following values */

4link    data: {

5link        name: 'Alex',

6link        age: 30,

7link        /* --> using the "remove" Symbol from "UpdateOp" */

8link        disabled: { [UpdateOp.remove]: true },

9link    },

10link    /* --> (optional) label(s) of the nodes to be matched. Multiple labels like 'User:Person' can also be used */

11link    label: 'User',

12link    /* --> (optional) the where clause for the nodes to be matched. A param object or a Where instance can be used */

13link    where: { // @see [Where](../Where-Parameters)

14link        /* --> the identifier needs to be used as a key */

15link        u: {

16link            id: {

17link                /* --> using the "in" Symbol from "Op" */

18link                $[Op.in]: ['1', '2']

19link            }

20link        }

21link    },

22link    /* --> (optional) the identifier of the nodes for the query. Is needed for parsing the results. Default is the value of 'QueryRunner.identifiers.default' */

23link    identifier: 'u',

24link    /* --> (optional) whether to return the nodes */

25link    return: true,

26link    /* --> (optional) an existing session or transaction to use */

27link    session: null,

28link});

29link

30link/* --> the result is the QueryResult from the neo4j driver. In case the nodes were returned, their properties can be retrieved */

31linkconsole.log(result.records.map((v) => v.get('u').properties));

linkUpdate Operators

Node properties can be updated just by setting a new value of the respective type. However, some update operations can only be performed using the exported UpdateOp variable.

linkRemove a Property

When this operation is set to true, the respective property will be completely removed from the node (similar to the JS delete operator).

1link// ...

2link  data: {

3link      name: 'Alex',

4link      /* --> using the "remove" Symbol from "UpdateOp" */

5link      age: { [UpdateOp.remove]: true },

6link  },

7link  // ...

8link  identifier: 'u',

9link// ...

10link

11linkconsole.log(result.records.map((v) => v.get('u').properties.age)); // undefined