Home/ Questions/Q 8177595
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-06T23:33:02+00:00

Would someone please explain the difference between the sqlType and jdbcType of the the

  • 0

Would someone please explain the difference between the sqlType and jdbcType of the the @Column annotation ?

http://www.datanucleus.org/products/datanucleus/jdo/annotations.html#Column

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    From the document you cited:

    http://www.datanucleus.org/products/datanucleus/jdo/annotations.html#Column

    • jdbcType String ORM : JDBC Type to use for persisting into this column

    • sqlType String ORM : SQL Type to use for persisting into this column

    In general, JDBC should provide a mapping to the underlying SQL type, and you should code your JDO implementation to the exposed JDBC type.

    This reference gives one example of where the distinction could be significant:

    Here’s some more documentation that might help:

    Q: So JDBC types are like standard data types while SQL types are
    types specific to each datastore?

    To answer you’re question, here’s what the JDO 3.0 Specification says, Section 18.4, Element column:

    http://download.oracle.com/otn-pub/jcp/jdo-3.0-mrel3-eval-oth-JSpec/jdo-3_0-mrel3-spec.pdf

    The sql-type attribute declares the type of the column in the
    database. This type is database-specific and should only be used where
    the user needs more explicit control over the mapping. Normally, the
    combination of jdbc-type. length, and scale are sufficient for the JDO
    implementation to calculate the sql-type.

    • 0