Hi Lukas, that sounds interesting!
i will give that i try and get myself accustomed with the JSON Serialisation directly by jooq. - For the typical REST-Queries that expect nested JSON this should work! There are some use-cases in my app i will need to think a bit how to solve them though. For example: - We have Exports (PDF; XML, JSON) with specific requirements - We need to create those exports in a streaming manner (chunks of 250 items) - We use MULTISET to prepare the nested DTOs that those Exports need to work with I guess i can think about preparing the nested data that is needed for the export into a Row-Like Format (maybe with help of db VIEWS). For PDF Creation i need to have a Pojo that i can push into my HTML template rendering engine (Quarkus Qute) and aferwards use Flyingsaucer to generate the PDF from the HTML. I guess a flat Pojo should be good for the Exports, i just need to find a way to Flatten my Nested data into such a flat Pojo (with help of VIEWS). --- But i think i should put effort into evaluating which use-cases are really unsolveable without the nested DTOs .. So i will try with my pet-project to kick away all self-written DTOs and try to work with the Jooq-Records (Table-Records) instead and also (as you suggested) try out the JSON-Serialization of jooq. lukas...@gmail.com schrieb am Freitag, 30. August 2024 um 06:04:09 UTC: > Folks, while I don't have too many opinions on various DTO designs, have > you considered skipping this step entirely? You're using MULTISET to > serialise a SQL JSON result to DTOs, which you serialise back to JSON using > Jackson. What for? Why not just serialise the JSON from the DB directly? > > https://blog.jooq.org/stop-mapping-stuff-in-your-middleware-use-sqls-xml-or-json-operators-instead/ > > On Thu, Aug 29, 2024 at 8:27 PM 'Bernd Huber' via jOOQ User Group < > jooq...@googlegroups.com> wrote: > >> Hello Dominik, >> >> yes i exactly have such a use-case and your example fits well. >> - I also use Jooq Multiset to fill the DTOs with data from the database. >> Really great! >> >> - The DTOs in your example are missing Getters/Setters ? (Those are my >> problem) >> >> I have a private pet-project that i use as private reference. I can show >> you an example DTO in this pet project: >> - >> https://github.com/funkrusher/fk-framework-quarkus-jooq/blob/main/_modules/fk_product/src/main/java/org/fk/product/dto/ProductDTO.java >> >> I fill this DTO with data (by using multiset) in this Repository-Class: >> - >> https://github.com/funkrusher/fk-framework-quarkus-jooq/blob/main/_modules/fk_product/src/main/java/org/fk/product/repository/ProductRepository.java >> >> Now as you can see the ProductDTO here is a very big class with many >> getters / setters. >> >> The getters and setters are boilerplate that makes the ProductDTO fat and >> hart to quickly judge if everything is correct. >> It works and is ok, but take for example a java14 record. >> >> For the java14 record you would not need any Getters / Setters and only >> need to define the fields >> So it would be much shorter and easier to look at for correctness. >> >> >> >> dominik...@gmail.com schrieb am Donnerstag, 29. August 2024 um 18:13:08 >> UTC: >> >>> Hello Bernd, >>> >>> I now understand your problem better. >>> So the cause lies in the target structure into which you want to fetch >>> your DB results. You need nested structures to map 1:n relationships... >>> >>> I also had this problem. I came up with the following solutions: >>> >>> I also define target DTOs that meet my requirements and can be >>> structured / nested as required. I don't use a REST API, so I don't have to >>> serialize to JSON, but I also want to define the DB results very precisely >>> for my Vaadin UIs. >>> >>> >>> 1) JOOQ multiset >>> >>> This is of course the most elegant way to map 1:n database relationships >>> directly into a DTO. Lukas has provided plenty of examples and tips, it's >>> really great. You can use it to build DTO structures that are nested as >>> deeply as you like and fill them directly with a single JOOQ query, e.g. >>> something like this >>> >>> class MyProjectListDTO { >>> private Integer projectId; >>> private List<Order> orders; >>> >>> class Order { >>> private Integer id; >>> private List<OrderPosition> positions; >>> } >>> class OrderPosition { >>> private Integer id; >>> private String name; >>> private CustomerAddress address; >>> } >>> } >>> >>> etc. >>> >>> 2) composition of pojos >>> Here you can build a DTO that contains any number of JOOQ pojos in a >>> flat structure. >>> >>> e.g. >>> class MyProjectListDTO { >>> private Project project; >>> private Order order; >>> private Customer customer; >>> } >>> >>> When fetching, you can get help from a 3rd party library ( >>> modelmapper.org), which fills the class attributes of your DTO >>> automatically with the help of prefixes of the DB result columns. >>> >>> 3) DTO extends POJO >>> You can of course also derive your DTO from a POJO and extend it >>> accordingly. >>> Unfortunately, this does not work for JOOQ Records, as Lukas has already >>> explained here in the group. >>> >>> I hope this helps you a bit, because I have the feeling, without knowing >>> all the details of course, that manual readjustment of the POJOS is not >>> really necessary. >>> >>> Kind regards >>> Dominik >>> >>> 5kil...@googlemail.com schrieb am Donnerstag, 29. August 2024 um >>> 18:26:44 UTC+2: >>> >>>> Hello Dominik and Lukas, >>>> >>>> you are both right about that if i use the generated code as-is >>>> (either by not checking it into git, or by letting it reside in the >>>> "generated"-folder) >>>> i would not run into my described problem >>>> >>>> - If checked in, the mergers could just assume that the code in the >>>> "generated"-folder is ok as auto-generated >>>> and would not need to be reviewed. >>>> - If not checked in, there would be no problem as it does not show in >>>> the merge at all. >>>> >>>> --- >>>> Lukas assumption in his last comment is correct. >>>> >>>> - My use-case is, that i need to hand-write my POJOs in a way to match >>>> the generated code >>>> >>>> My use-case is described as follow as example with a new database-table: >>>> - 1. i create a liquibase-migration that creates the new >>>> database-table(s) >>>> - 2. i run the jooq-codegenerator which creates the Pojos for those new >>>> database-table(s) >>>> - 3. i copy the Pojos from the "generated"-folder into the project >>>> "source"-folder >>>> - 4. i now change the Pojos in the "source"-folder by adding >>>> relationships between the Pojos to create a "nested" structure that >>>> reflects the database-relationships (i rename the Pojos to DTOs also) >>>> - 5. The so created DTOs need to be Serializable by Jackson to create >>>> JSON and return this nested-json to the Frontend for consumption. >>>> >>>> This would be one of the typical use-cases why i need to hand-write my >>>> POJOs (DTOs) and not use the generated code for all my use-cases (only for >>>> some). >>>> >>>> - If The database-table(s) are changed now, i need a way to detect that >>>> i need to change my handwritten Pojos to be noticed of those changes. >>>> - For this i let my handwritten Pojos implement the jooq generated >>>> Interfaces, which work great so far! >>>> - Sadly the Getters / Setters in my handwritten Pojos need to be >>>> reviewed by the Mergers and i search for a way to make my handwritten >>>> pojos >>>> more simple, while still be noticed of changes. >>>> >>>> ---- >>>> >>>> The best solution would be to use as less handwritten code as possible, >>>> but for now i see no way to get rid of the hand-written pojos, so i seek >>>> for a way to get rid of the getters / setters. >>>> Java14 Records of Frameworks like "Lombok" seem to be able to help here. >>>> >>>> But it's not really an important problem to me, - it's only a small >>>> nuisance, which is also totally fine to work with :) >>>> >>>> lukas...@gmail.com schrieb am Donnerstag, 29. August 2024 um 07:07:32 >>>> UTC: >>>> >>>>> Thanks for your message, Bernd, >>>>> >>>>> Well that "specification" that you're talking about is just the >>>>> previous version of your schema. You could generate interfaces from your >>>>> schema with jOOQ (use the <interfaces/> flag) in a code generation run 1, >>>>> then in code generation run 2, re-generate the records, and try to >>>>> compile >>>>> them against the previously generated interfaces. You can add interfaces >>>>> to >>>>> any generated class using generator strategies, e.g.: >>>>> >>>>> https://www.jooq.org/doc/latest/manual/code-generation/codegen-matcherstrategy/ >>>>> >>>>> This does what you're asking for. >>>>> >>>>> But I'm not really sure I understand the underlying use-case here. Is >>>>> this because you would like to hand-write your POJOs in a way to match >>>>> the >>>>> generated code, but for some reason, *not* use the code generator for >>>>> this? >>>>> >>>>> On Wed, Aug 28, 2024 at 8:47 PM 'Bernd Huber' via jOOQ User Group < >>>>> jooq...@googlegroups.com> wrote: >>>>> >>>>>> I want to ask about the ".withRecords(true)" Functionality of the >>>>>> Jooq-Codegenerator... >>>>>> >>>>>> - is it possible to let those Pojos (which are generated as >>>>>> java14-records) adhere to some specification, that makes sure that >>>>>> whenever >>>>>> the db-table-schema changes i get a error in my IDE to see that i need >>>>>> to: >>>>>> - add a field >>>>>> - remove a field >>>>>> - rename a field >>>>>> >>>>>> With specification a Java-Interface would be optimal. >>>>>> >>>>>> I guess the Java-Interface should work if it defines the >>>>>> default-getters of the java14-records. >>>>>> >>>>>> For example: >>>>>> >>>>>> public interface PersonSpec { String name(); int age(); } >>>>>> >>>>>> public record Person(String name, int age) implements PersonSpec { >>>>>> // No additional methods needed; the record already provides them. >>>>>> } >>>>>> >>>>>> >>>>>> --- >>>>>> >>>>>> i currently think about using java14-Records instead of normal Pojos >>>>>> (with getters/setters) because the getters/setters can be harder to >>>>>> review >>>>>> in merge-requests. The getters/setters are often so much code that the >>>>>> review-person in the merge-request has much to review, while it would >>>>>> only >>>>>> be fields. >>>>>> >>>>>> But i don't want to loose the advantage of letting the Pojo implement >>>>>> and interface, which makes sure that if my db-table changes its schema i >>>>>> am >>>>>> forced to also fix the Pojo for that. >>>>>> >>>>>> -- >>>>>> >>>>> You received this message because you are subscribed to the Google >>>>>> Groups "jOOQ User Group" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to jooq-user+...@googlegroups.com. >>>>>> >>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/jooq-user/c2fa6bd1-d999-452c-8a15-80a481680d90n%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/jooq-user/c2fa6bd1-d999-452c-8a15-80a481680d90n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>> . >>>>>> >>>>> -- >> You received this message because you are subscribed to the Google Groups >> "jOOQ User Group" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to jooq-user+...@googlegroups.com. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/jooq-user/42e071be-71d0-45e6-a3af-501c7a64cc91n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/jooq-user/42e071be-71d0-45e6-a3af-501c7a64cc91n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "jOOQ User Group" group. 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