example.html @@ -0,0 +1,54 @@ +Today I was thinking aloud about [Tree Regular Expressions](http://research.microsoft.com/Users/luca/Slides/2003-11-13%20Transitions%20in%20Programming%20Models%20$Lisbon$.pdf) and how they might make a nice query language for document databases like CouchDB. Someone pointed out that CSS3 selectors might make a great concrete syntax for this. One thing lead to another and I thought, why not build a relational database in HTML? So I did. I even got **inner joins** working. + +Let's start with a few tables: + + <table class="users"> + <tr> + <td class="id">1</td> + <td class="first_name">amy</td> + <td class="last_name">bobamy</td> + </tr> + ... + </table> + <table class="photos"> + <tr> + <td class="id">1</td> + <td class="user_id">1</td> + <td class="url">http://www.example.com/foo.png</td> + </tr> + </table> + +Now we can express some queries: + + $('.users') + .where('.id:eq(1)') + .select('*') + +This is equivalent to `SELECT * FROM users WHERE id = 1` + + $('.users') + .where('.id:eq(1)') + .select('.id, .name') + +This is equivalent to `SELECT id, name FROM users WHERE id = 1`. Here is something slightly more complicated: + + $('.users') + .where('.name:contains(a)') + .and('.name:contains(c)') + .select('*') + +But here is **the crowning glory**, the inner join: + + $('.users') + .join('.photos') + .where('.photos.user_id:eq(.users.id)') + .and('.users.id:eq(1)') + .select('.photos.url') + +This is equivalent to: + + SELECT photos.url FROM users, photos + WHERE photos.user_id = users.id + AND users.id = 1 + +[Download the fun](http://github.com/nkallen/jquery-database/tree/master) at Github. \ No newline at end of file README 4e30c5e560cff3c5309169856cb6c699d3fd124e Nick Kallen nkallen@nick-kallens-computer-2.local http://github.com/nkallen/jquery-database/commit/96ed31fe17663d385749aaa5394977e3093879e8 96ed31fe17663d385749aaa5394977e3093879e8

2008-04-08T01:02:34-07:00

documentation 4f18a49cfe782873f62d32e1f70fa9c91c2f8d3a Nick Kallen nkallen@nick-kallens-computer-2.local