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2013-06-25T11:35:38.597
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If your primary goal is to run SQL (or SQLesque) statements within your H2 Java user-defined functions, <a href="http://www.jooq.org" rel="nofollow">jOOQ</a> could be an option as a <a href="http://blog.jooq.org/2013/04/27/jooq-as-a-pljava-language/" rel="nofollow">"PL/Java" implementation</a>. Of course, this would still be a Java solution. An example of such a function can be seen in this blog post: <a href="http://blog.jooq.org/2011/11/04/use-jooq-inside-your-h2-database" rel="nofollow">http://blog.jooq.org/2011/11/04/use-jooq-inside-your-h2-database</a> <pre class="lang-java prettyprint-override"><code>public class Functions { public static int countBooks(Connection connection, Integer authorId) throws SQLException { // Translate your T-SQL statements to jOOQ statements return DSL.using(connection, SQLDialect.H2) .selectCount() .from(BOOK) .where(BOOK.AUTHOR_ID.eq(authorId)) .fetchOne(0, int.class); } } </code></pre> Declare the above method as an ALIAS to H2 <pre class="lang-sql prettyprint-override"><code>CREATE ALIAS countBooks FOR "org.example.Functions.countBooks"; </code></pre> Use the function in SQL <pre class="lang-sql prettyprint-override"><code>SELECT author.last_name, countBooks(author.id) FROM author </code></pre> A similar approach can be taken with H2's own SQL abstraction <a href="http://www.h2database.com/html/jaqu.html" rel="nofollow">JaQu</a>, of course. Using JaQu wouldn't add any additional dependency, I think.
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1. POHow to write a function in the H2 database without using Java
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