Creating graph elements - nodes and relationships, is done with CREATE
.
Creating a single node is done by issuing the following query.
Query
CREATE n
Nothing is returned from this query, except the count of affected nodes.
The values for the properties can be any scalar expressions.
Query
CREATE n = {name : 'Andres', title : 'Developer'}
Nothing is returned from this query.
Creating a single node is done by issuing the following query.
Query
CREATE (a {name : 'Andres'}) RETURN a
The newly created node is returned. This query uses the alternative syntax, which fits with how RELATE
looks.
To create a relationship between two nodes, we first get the two nodes. Once the nodes are loaded, we simply create a relationship between them.
Query
START a=node(1), b=node(2) CREATE a-[r:REL]->b RETURN r
The created relationship is returned.
Setting properties on relationships is done in a similar manner to how it’s done when creating nodes.Note that the values can be any expression.
Query
START a=node(1), b=node(2) CREATE a-[r:REL {name : a.name + '<->' + b.name }]->b RETURN r
The newly created relationship is returned.
You can also create a graph entity from a Map<String,Object> map. All the key/value pairs in the map will be set as properties on the created relationship or node.
Query
create node {props}
This query can be used in the following fashion:
Map<String, Object> props = new HashMap<String, Object>(); props.put( "name", "Andres" ); props.put( "position", "Developer" ); Map<String, Object> params = new HashMap<String, Object>(); params.put( "props", props ); engine.execute( "create ({props})", params );
By providing an iterable of maps (Iterable<Map<String,Object>>), Cypher will create a node for each map in the iterable. When you do this, you can’t create anything else in the same create statement.
Query
create node {props}
This query can be used in the following fashion:
Map<String, Object> n1 = new HashMap<String, Object>(); n1.put( "name", "Andres" ); n1.put( "position", "Developer" ); Map<String, Object> n2 = new HashMap<String, Object>(); n2.put( "name", "Michael" ); n2.put( "position", "Developer" ); Map<String, Object> params = new HashMap<String, Object>(); List<Map<String, Object>> maps = Arrays.asList(n1, n2); params.put( "props", maps); engine.execute("create (n {props}) return n", params);
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