javascript - How do I do an JOIN-type query in IndexedDB -


i have tried following tutorial @ http://hacks.mozilla.org/2010/06/comparing-indexeddb-and-webdatabase/ regards doing queries in indexeddb, example not work.

how join type query in indexeddb? have set objectstores indexes, cant seem syntax?

indexeddb key-value (document) store. doesn't have join query or querying on multiple object store. can query multiple stores in transaction. how suppose make join query in indexeddb.

i have bit of writeup modeling relationship http://dev.yathit.com/ydn-db/schema.html using library.

here joining query select * supplier, part supplier.city = part.city.

var iter_supplier = new ydn.db.indexvalueiterator('supplier', 'city'); var iter_part = new ydn.db.indexvalueiterator('part', 'city'); var req = db.scan(function(keys, values) {   var sid = keys[0];   var pid = keys[1];   console.log(sid, pid);   if (!sid || !pid) {     return []; // done   }   var cmp = ydn.db.cmp(sid, pid); // compare keys   if (cmp == 0) {     console.log(values[0], values[1]);     return [true, true]; // advance both   } else if (cmp == 1) {     return [undefined, sid]; // jump pid cursor match sid   } else {     return [pid, undefined]; // jump sid cursor match pid   } }, [iter_supplier, iter_part]);

see more detail on join query article.


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