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    <p>From the document you cited:</p> <p><a href="http://www.datanucleus.org/products/datanucleus/jdo/annotations.html#Column" rel="nofollow">http://www.datanucleus.org/products/datanucleus/jdo/annotations.html#Column</a></p> <ul> <li><p>jdbcType String ORM : JDBC Type to use for persisting into this column </p></li> <li><p>sqlType String ORM : SQL Type to use for persisting into this column </p></li> </ul> <p>In general, JDBC should provide a mapping to the underlying SQL type, and you should code your JDO implementation to the exposed JDBC type.</p> <p>This reference gives one example of where the distinction could be significant:</p> <ul> <li><a href="http://osdir.com/ml/apache.db.jdo.devel/2005-07/msg00139.html" rel="nofollow">http://osdir.com/ml/apache.db.jdo.devel/2005-07/msg00139.html</a></li> </ul> <p>Here's some more documentation that might help:</p> <ul> <li><a href="http://java.sun.com/developer/technicalArticles/J2SE/jdo/" rel="nofollow">http://java.sun.com/developer/technicalArticles/J2SE/jdo/</a></li> </ul> <blockquote> <p>Q: So JDBC types are like standard data types while SQL types are types specific to each datastore?</p> </blockquote> <p>To answer you're question, here's what the JDO 3.0 Specification says, Section 18.4, Element column:</p> <blockquote> <p><a href="http://download.oracle.com/otn-pub/jcp/jdo-3.0-mrel3-eval-oth-JSpec/jdo-3_0-mrel3-spec.pdf" rel="nofollow">http://download.oracle.com/otn-pub/jcp/jdo-3.0-mrel3-eval-oth-JSpec/jdo-3_0-mrel3-spec.pdf</a></p> <p>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.</p> </blockquote>
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    1. POWhat's the difference between jdbcType and sqlType for the @Column annotation?
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    1. POWhat's the difference between jdbcType and sqlType for the @Column annotation?
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    1. COSo JDBC types are like standard data types while SQL types are types specific to each datastore ?
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