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    <p>Using <code>static embedded</code> is ok, but in my situation it was better to define my own <code>"user-type"</code>and adding it to GORM mapping.</p> <p>I have only one <code>String</code> field with random generated business key in my class, so I wanted to store this value as varchar in db. The solutions is:</p> <p>In <code>Config.groovy</code> define:</p> <pre><code>grails.gorm.default.mapping={ "user-type" (type: my.package.persistence.PersistentBookKey, class: BookKey) } </code></pre> <p>Create class <code>PersistentBookKey</code> which implements <code>UserType</code> interface and ovveride some methods:</p> <pre><code>final class PersistentBookKey implements UserType { @Override protected BookKey createKeyFromString(String key) { BookKey.from(key) } @Override Class returnedClass() { BookKey } private static int [] SQL_TYPES=[Types.VARCHAR] as int[] @Override int[] sqlTypes() { return SQL_TYPES } @Override boolean equals(Object x, Object y) throws HibernateException { return x.equals(y); } @Override int hashCode(Object x) throws HibernateException { return x.hashCode() } @Override Object nullSafeGet(ResultSet rs, String[] names, Object owner) throws HibernateException, SQLException { def key=rs.getString(names[0]) return this.createKeyFromString(key); } @Override void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, SQLException { BookKey persistent=value as BookKey st.setString(index,persistent?.getKey()) } @Override Object deepCopy(Object value) throws HibernateException { return value } @Override boolean isMutable() { return false //To change body of implemented methods use File | Settings | File Templates. } @Override Serializable disassemble(Object value) throws HibernateException { return value as Serializable } @Override Object assemble(Serializable cached, Object owner) throws HibernateException { return cached } @Override Object replace(Object original, Object target, Object owner) throws HibernateException { return original } } </code></pre> <p>Now BookKey objects are stored in database as Varchar, but when I get them, they are converted back to BookKey object.</p> <p>For more informations you can look here:</p> <p><a href="http://grails.org/doc/2.0.x/ref/Database%20Mapping/Usage.html" rel="nofollow">http://grails.org/doc/2.0.x/ref/Database%20Mapping/Usage.html</a></p> <p><a href="http://grails.1312388.n4.nabble.com/Working-example-of-user-type-td1377468.html" rel="nofollow">http://grails.1312388.n4.nabble.com/Working-example-of-user-type-td1377468.html</a></p>
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