H2 1.4.198 breaks source and binary compatibility with 1.4.197: org.h2.value.Value.getResultSet()

Gary Gregory

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Feb 23, 2019, 8:24:55 AM2/23/19

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Hi All:

Thank you for a new version of H2 but H2 1.4.198 breaks source and binary compatibility with 1.4.197 by removing the method org.h2.value.Value.getResultSet().

For example, this breaks our build over at Apache Commons CSV.

What is your recommendation? If the removal was accidental, do you plan on issuing a new release?

Thank you,

Gary

Evgenij Ryazanov

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Feb 23, 2019, 8:44:44 AM2/23/19

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Hello.

You should not use internals of H2 unless you're ready that they can be changed or removed in any version without a warning.

This method was removed intentionally. You can try to use Value.getResult()` instead, but it returns an instance of org.h2.api.ResultInterface that also is not a part of stable API.

Gary Gregory

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Feb 23, 2019, 9:20:42 AM2/23/19

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Hm... ok. What about documenting internal classes as such then? The Javdoc for the *public* Value says:

* This is the base class for all value classes.

* It provides conversion and comparison methods.

Gary

Noel Grandin

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Feb 23, 2019, 9:39:52 AM2/23/19

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Everything in H2 is internal unless specified otherwise.

Gary Gregory

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Feb 23, 2019, 9:43:23 AM2/23/19

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And *that* is documented... where?

Gary

Evgenij Ryazanov

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Feb 23, 2019, 9:59:39 AM2/23/19

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H2 is not a library. It's a database engine. Database engines are used via JDBC.

If you read H2 documentation (not the Javadoc) you can find that H2 additionally provides some API and tools for specific operations where JDBC is not enough, like usage of data types that doesn't have JDBC mappings, creation of user-defined functions, server control and so on.

Value is not a part of such API.

Gary Gregory

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Feb 23, 2019, 10:01:40 AM2/23/19

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Evgenij,

Thank you for the details.

Gary

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Noel Grandin

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Feb 23, 2019, 10:44:59 AM2/23/19

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Do you have a link to the relevant Apache code? Perhaps we can suggest something that doesn't need to touch internal classes

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