Question

i am new to Apache SOLR..n i am learning how to create documents in SOLR..

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My scenario : In my RDBMS database, i have the following scenario :

A “cars” table “jc_cars” : id, name, extra

An “attributes” table “jc_attributes” : id, attributeName

A Many-to_many table between Attribute and Cars :
“jc_car_attributes” : carID, attributeID , value

An “article” table : jc_articles : id, title, description

A Many-to-many table between Article and Cars :
“jc_car_articles” : articleID, carID

Now what I want is :

• Searching All the Cars with their Attributes (like Price)
• Searching All the Articles related to this Car

Actually I want results when i make the following the query :

• Cars with price less than 400000 : Should give Car Details and
  related Articles
• Hyundai Accent : Should give Car Details and related Articles
• and So on…..

So how should i create the Corresponding document and Schema.xml..??

Answer 1

Solr has a flat index, so you can’t really have a list of relations with multiple values (e.g. a relation with both a name and a value, like your attributes).

For the articles, you can provide the IDs of related articles in a multi-valued field, then do a separate lookup for these either (a) in your database (b) in another solr core.

For the attributes, if you have a fixed list of attributes you can join these to cars and read each attribute into its own field. If you do not have a fixed list of attributes, you’ll also have to resort to a separate core, doing essentially the reverse of what you would do for articles; do a lookup in the attributes core then lookup the specific cars from your cars core.