Download Good Relationships by Michael Hunger PDF

By Michael Hunger

With Spring facts, the ever well known Spring Framework has cultivated a brand new patch of flooring, bringing monstrous information and NOSQL expertise like Neo4j to company builders. This advisor introduces you to Spring info Neo4j, utilizing the short, robust and scalable graph database Neo4j to benefit from the advantages of getting solid relationships on your info. Written via the undertaking lead, reliable Relationships offers all of the functional information you wish for constructing firm purposes with Spring info Neo4j. The booklet begins with a story educational approximately enforcing Cineasts.net, an entire social web-app for motion picture fans. Then, an intensive reference half info center Neo4j recommendations, querying, and the straightforward annotated POJO programming version of Spring info Neo4j.

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Often an index is used to establish the start node for a traversal. Indexes are accessed by a repository for a particular node or relationship entity type. 8, “CRUD with repositories” for more information. 5. @Query: fields as query result views The @Query annotation leverages the delegation infrastructure supported by Spring Data Neo4j. It provides dynamic fields which, when accessed, return the values selected by the provided query language expression. The provided query must contain a placeholder named {self} for the the current entity.

2, “Advanced Mapping with AspectJ”. 3, “Simple Object Graph Mapping”) to Spring Data Neo4j. Both versions work with the same annotations and provide similar API's, but differ in behaviour. Reflection and Annotation-based metadata is collected about persistent entities in the Neo4jMappingContext which provides it to any part of the library. The information is stored in Neo4jPersistentEntity instances which hold all the Neo4jPersistentProperty's of the type. Each entity can be checked to determine whether it represents a Node or a Relationship.

5. @Query: fields as query result views The @Query annotation leverages the delegation infrastructure supported by Spring Data Neo4j. It provides dynamic fields which, when accessed, return the values selected by the provided query language expression. The provided query must contain a placeholder named {self} for the the current entity. For instance the query start n=node({self}) match n-[:FRIEND]->friend return friend. Graph queries can return variable number of entities. That's why annotation can be put onto fields with a single value, a subclass of Iterable of a concrete type or an Iterable of Map.

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