Query by Example support

[zeljko-mirovic]

I am a bit confused by #929.
Support for converting Example into Query/Criteria is added, but nothing else?
To use query by example in a repository, additional changes are needed in repository implementation and classes used by that implementation like JdbcAggregateTemplate and DataAccessStrategy?
Do you have a plan to continue with that?

[schauder]

#929 together with 9336d09 implements Query By for Spring Data R2DBC.

Query By Example is currently not in the near future plans, but is certainly something we want to support eventually.

[DiegoKrupitza]

I can take a closer look at this.

[DiegoKrupitza]

I started with implementing "query by example" but I can't implement the MyBatis version of this since my MyBatis knowledge is none existing. I hope somebody can be found who implements this at a later point. Changes only need to be done within org.springframework.data.jdbc.mybatis.MyBatisDataAccessStrategy.java

[DiegoKrupitza]

I implemented 6 out of the 7 methods provided by QueryByExampleExecutor.
The method findBy(Example<S> example, Function<FetchableFluentQuery<S>, R> queryFunction); is not implemented since I can't figure out what should happen here 😅 .

The MyBatis implementation is missing as already mentioned above.

Both are marked with UnsupportedOperationException.