What is currently best ORM in OCaml world?

Learning
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I am new learn OCaml, I write Java currently.
I am looking for database ORM library for OCaml.
Some ORM library for OCaml similar Mybatis to Java world?

2

OCaml doesn’t really have ORMs in the same style as Java. It has more what I would call ‘FRM’ or ‘Functional Relational Mapper’. The idea behind them is you write SQL queries, and the FRM turns it into a function that you can call to run the query, and maps back the results into OCaml objects. Check out ppx_rapper for one example of this. Shameless plug: another example is my SQLite query library wrapper.

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I enjoy ppx_rapper as mentioned quite a bit.

Another option with what looks like a quality ppx facility for easy syntactic integration into your codebase is pgocaml, which takes a somewhat different approach to land in a similar spot w.r.t. compile-time checking of queries and such. (/ht @glennsl for pointing towards it @ [ANN] First release of PGX (Pure-OCaml PostgreSQL client) with some good discussion of pgocaml’s benefits).