How to implement a primary key property for a label
Commencing with Neo4j 2.3.x it is possible to create the equivalent of a primary key on a property of a label. For example the following Cypher:
CREATE CONSTRAINT ON (book:Book) ASSERT book.isbn IS UNIQUE
CREATE CONSTRAINT ON (book:Book) ASSERT exists(book.isbn)will create two constraints on the property isbn of nodes with label Book and ensure that when a new Book node is created, its isbn must be defined, and that it must be unique across all nodes with the Book label.
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Property existence constraints are only available in the Neo4j Enterprise Edition. Databases with property existence constraints cannot be opened using Neo4j Community Edition. |
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