this looks like a common problem. I guess DIH should handle this more gracefully. Instead of firing a query and failing it should not fire a query if any of the values are missing . This can b made configurable if needed
On Sun, Jun 13, 2010 at 9:14 AM, Lance Norskog <goks...@gmail.com> wrote: > This is a slow way to do this; databases are capable of doing this > join and feeding the results very efficiently. > > The 'skipDoc' feature allows you to break out of the processing chain > after the first query. It is used in the wikipedia example. > > http://wiki.apache.org/solr/DataImportHandler > > On Sat, Jun 12, 2010 at 6:37 PM, Holmes, Charles V. <chol...@mitre.org> > wrote: > > I'm putting together an entity. A simplified version of the database > schema is below. There is a 1-[0,1] relationship between Person and Address > with address_id being the nullable foreign key. If it makes any difference, > I'm using SQL Server 2005 on the backend. > > > > Person [id (pk), name, address_id (fk)] > > Address [id (pk), zipcode] > > > > My data config looks like the one below. This naturally fails when the > address_id is null since the query ends up being "select * from user.address > where id = ". > > > > <entity name="person" > > Query="select * from user.person"> > > <entity name="address" > > Query="select * from user.address where id = > ${person.address_id}" > > </entity> > > </entity> > > > > I've worked around it by using a config like this one. However, this > makes the queries quite complex for some of my larger joins. > > > > <entity name="person" > > Query="select * from user.person"> > > <entity name="address" > > Query="select * from user.address where id = (select address_id > from user.person where id = ${person.id})"> > > </entity> > > </entity> > > > > Is there a cleaner / better way of handling these type of relationships? > I've also tried to specify a default in the Solr schema, but that seems to > only work after all the data is indexed which makes sense but surprised me > initially. BTW, thanks for the great DIH tutorial on the wiki! > > > > Thanks! > > Charles > > > > > > -- > Lance Norskog > goks...@gmail.com > -- ----------------------------------------------------- Noble Paul | Systems Architect| AOL | http://aol.com
