I found the "Inheritance" thread from May 5: http://tinyurl.com/9nn7a http://www.mail-archive.com/ibatis-dev%40incubator.apache.org/msg00961.html
I saw Clinton's comment "The .NET version of iBATIS supports the <subclass> element, but currently the Java version does not." but he didn't expand on what the <subclass> element is or what it does. I also saw your comment to the dataMapperGuide file on May 5th: "- Updated doc for Inheritance and setting validateSqlMap" from this page: http://tinyurl.com/7zbme http://svn.apache.org/viewcvs.cgi/incubator/ibatis/trunk/cs/docs/dataMapperGuide/src/en/dotnet.xml?rev=168385&view=log But the diff: http://tinyurl.com/c2tef http://svn.apache.org/viewcvs.cgi/incubator/ibatis/trunk/cs/docs/dataMapperGuide/src/en/dotnet.xml?rev=168385&r1=152334&r2=168385&diff_format=h seems to only talk about validateSqlMap. I understand these test cases: http://tinyurl.com/b3h8y http://svn.apache.org/viewcvs.cgi/incubator/ibatis/trunk/cs/mapper/IBatisNet.DataMapper.Test/NUnit/SqlMapTests/InheritanceTest.cs?rev=156095&view=markup Assert.AreEqual(6, list.Count); Book book = (Book) list[0]; AssertBook(book, 1, "The World of Null-A", 55); book = (Book) list[1]; AssertBook(book, 3, "Lord of the Rings", 3587); Newspaper news = (Newspaper) list[2]; AssertNewspaper(news, 5, "Le Monde", "Paris"); What I'm having a hard time with now is understanding how you can write a sql statement that handles several subclasses for document (i.e. Book, Newspaper, Magazine). I'm imagining a single sql statement joining a lot of tables and having many many columns. There's a good possibility that the whole concept is very simple and I'm just thinking about it to much. Maybe someone can offer up another example besides documents, newspapers, etc. A link to a Hibernate FAQ or thread would be helpful too. Thanks, Ron --- Gilles Bayon <[EMAIL PROTECTED]> wrote: > On 5/9/05, Ron Grabowski <[EMAIL PROTECTED]> wrote: > > Gilles, I've looked at the code for the new <discriminator> node > for > > <resultMap>s and I can't get my head around it. I believe the idea > came > > from the Hibernate people: > > > > > http://www.hibernate.org/hib_docs/reference/en/html/inheritance.html > > http://groups-beta.google.com/groups?q=Hibernate+discriminator > > > > From reading those articles, is it correct to say that I use a > > discriminator to decide how sub-objects are populated? > > Is a <discriminator> used in conjunction with <subMap> nodes? This > url: > > Yes > > > http://tinyurl.com/c9vk8 > > > http://svn.apache.org/repos/asf/incubator/ibatis/trunk/cs/mapper/IBatisNet.DataMapper.Test/Maps/MSSQL/SqlClient/Document.xml > > > > has the following text: > > > > <resultMap id="document" class="Document"> > > <result property="Id" column="Document_ID"/> > > <result property="Title" column="Document_Title"/> > > <discriminator column="Document_Type" /> > > <subMap value="Book" resultMapping="book" /> > > <subMap value="Newspaper" resultMapping="newspaper" /> > > </resultMap> > > > > Can I replace that with this: > > > > <resultMap id="document" class="Document"> > > <result property="Id" column="Document_ID"/> > > <result property="Title" column="Document_Title"/> > > <discriminator column="Document_Type" /> > > </resultMap> > > > > Do I need to use <subMap> nodes when I use a <discriminator> node? > > You need, have you watch the nunit test and the doc ? there is an > email on ibatis-dev named "Inheritance" (May 5) which contains the > last pdf doc >
