Question

what’s wrong with this code in Google Chrome

r = webkitIndexedDB.open(db_name,1);
r.onsuccess = success_callback;
r.onerror = error_callback;
r.onupgradeneeded = function(e){
   var db = e.currentTarget.result;
   db.createObjectStore('os_name',{keyPath:id,autoIncrement:true});
};

it’s works in firefox (mozIndexedDB) but not in chrome. even onerror won’t be triggered. anyway i get this error

Uncaught Error: NOT_FOUND_ERR: DOM IDBDatabase Exception 3

Answer 1

onupgradeneeded is not supported function in Google Chrome, instead you should use the setversion method for initiating the database in the beginning of onsuccess event on database opening as described here:
http://www.html5rocks.com/en/tutorials/indexeddb/todo/#toc-step2

Your code should look something like this:

r.onsuccess = function(e) {
    var v = "1.0";
    var db = e.currentTarget.result;
    // We can only create Object stores in a setVersion transaction;
    if(v!= db.version) {
      var setVrequest = db.setVersion(v);

      setVrequest.onfailure = error_callback;
      setVrequest.onsuccess = function(e) {
        var store = db.createObjectStore('os_name',{keyPath:id,autoIncrement:true});
        ...
      };
    }
    ...
}

Edit November 2013: This is a obsolete answer now, since Google Chrome only supports upgrade of the database with the onupgradeneeded event.