2.4 · Lesson

The Neo4j Type System

At this point, you need to know the Full definition for Cypher (opens in a new tab)Neo4j's implementation of GQL, the ISO standard query language for graph databases. It is declarative: you describe the pattern to find, and the database decides how to find it. type system to map database entities to domain entities. As Neo4j is written in Java (the j in Neo4j stands for Java, after all), there are only minor discrepancies between the types stored in the Neo4j database and native Java types.

Java Type	Neo4j Cypher Type	Notes
`String`	`String`
`Long`*	`Integer`	See Integers
`Double`	`Float`	Double in Java can contain the smaller Float values, so Neo4j Float is mapped to the larger Java Double.
`Boolean`	`Boolean`
`List`	`List`	Neo4j can only store a flat array containing strings, booleans, or numbers.
`Map`	`Map`
`Object`	`Object`
`java.time.` `LocalDate`	`Date`
`java.time.` `OffsetTime`	`Time`
`java.time.` `LocalTime`	`LocalTime`
`java.time.` `ZonedDateTime`	`DateTime`	See Temporal Types
`java.time.` `LocalDateTime`	`LocalDateTime`
`java.time.temporal.` `TemporalAmount`	`Duration`	See Temporal Types
`org.neo4j.` `driver.types.` `Point`	`Point`	See Spatial Types
`null`, `null`	`null`