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1. Query Arbitrary Shape

Basic Concepts​

Although Jimmer entities are strongly typed, they are also dynamic and can express the ever-changing shape of data structures.

Therefore, Jimmer supports ObjectFetcher, which can control the shape of the queried data structure and then uniformly return Jimmer entities.

This is an extremely similar concept to GraphQL, but there are huge differences:

  • GraphQL is an application layer protocol based on HTTP that can only expose this capability by building HTTP services, and only HTTP clients can enjoy this capability.

  • For Jimmer, the ability to query arbitrary shapes is an inherent behavior of ORM that can be used programmed anywhere.

    • You can use it to expose GraphQL services.

    • As shown in the content of this section, you can also expose REST services.

    • It can even be used within applications without crossing any remote boundaries.

Demo​

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Compare to GraphQL
  • GraphQL is based on HTTP services, which can only be experienced if it crosses the boundaries of HTTP services. In Jimmer, this is the underlying API for ORM, and you can use this capability in any code logic.
  • Until now, the GraphQL protocol does not support recursive queries on self-associated properties with infinite depth; And Jimmer supports