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Editorial Team
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Asked: 2026-05-16T02:09:21+00:00

I was playing around with the DatabaseMetaData class to see how it works. The

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I was playing around with the DatabaseMetaData class to see how it works. The java doc comments seem to state one thing, while the code does a different. I know it is an interface, so it is really up to the vendor that supplied the JDBC driver to implement this correctly. But I was wondering if I am missing something or not?

I am using this with a version of Oracle 10g. Basically the comment implies that it will return the following 10 columns in the resultset:

  • TABLE_CAT

  • TABLE_SCHEM

  • TABLE_NAME

  • TABLE_TYPE

  • REMARKS

  • TYPE_CAT

  • TYPE_SCHEM

  • TYPE_NAME

  • SELF_REFERENCING_COL_NAM

  • REF_GENERATION

In reality I only get 5 columns in the result set:

  • TABLE_CAT

  • TABLE_SCHEM

  • TABLE_NAME

  • TABLE_TYPE

  • REMARKS

So what gives? Am I misreading the javadocs or is this pretty much par for the course with jdbc drivers. For instance if I swapped out oracle for MySQL (of course getting the appropriate driver) would I probably get a number of columns?

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1 Answer

  1. Editorial Team

    The JDBC driver for Oracle 10g that you are using is just fulfilling an older spec. Here is a JavaDoc to which it conforms. You have to know the JDBC version of your JDBC drivers to work with them effectively when you do more than the absolute basics.

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