javascript - indexedDB doesn't reset version when you delete a database on Chrome -- bug or user error? -

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the following code throws error in chrome 35 (but not firefox 29) if set buggy true.

since i'm pretty new in indexeddb wanted ask whether ought work or not. if delete database , open again version=1, shouldn't onupgradeneeded callback called?

<html>   <head>     <script type="text/javascript">       var = 1000;       var buggy = true;       function open() {         var version = buggy ? 1 : 1001 - i;         var request = indexeddb.open("test", version);         var upgraded = false;         request.onupgradeneeded = function() {           upgraded = true;           console.log("upgraded ok");         }         request.onsuccess = function() {           if (!upgraded) {             throw "not upgraded";           }           console.log("open ok");           if (--i != 0) { obliterate(); }         }         request.onerror = function() {           throw "error in open";         }       }        function obliterate() {         var request = indexeddb.deletedatabase("test");         request.onsuccess = function() {           console.log("delete ok");           open();         }         request.onerror = function(event) {           throw "error in obliterate.";         }       }        obliterate();     </script>   </head>   <body>   </body> </html>

in chrome, buggy=true, get:

delete ok test.html:29 upgraded ok test.html:12 open ok test.html:18 delete ok test.html:29 uncaught not upgraded

in firefox works fine.

as side note, in both chrome , firefox, runs incredibly -- 5-10 seconds create , delete database single time. normal/expected? doing wrong?

this user error.

deletions in indexeddb fast in both firefox , chrome. haven't done measurement. put things perspective: in test suite synceddb delete , create database between every single test. there 67 tests , execute in less second. , database deletions , creations not time consuming part of tests.

what you've stumbled upon 1 of tricky parts of how indexeddb works. indexeddb has notion of database connection. relevant parts regards problem is:

  • you establish connection opening database open function. connection represented idbdatabase acquire through open.
  • a database can not deleted long open connections it.
  • when attempt made delete database 'versionchange' event fired against open idbdatabase objects connected database. event have newversion property set null.

the problem call obliterate function inside open requests onsuccess event handler. point trying delete database @ have open connection. problematic , why example code not work in chrome (it appears firefox times out connection , completes deletion, albeit huge delay).

the fix attach listener versionchange event in onsuccess event handler. add after line if (--i != 0) { obliterate(); }:

request.result.onversionchange = function(e) {     if (e.newversion === null) { // attempt made delete db         e.target.close(); // manually close our connection db     } };

inserting see both firefox , chrome no rapidly create , delete tests database.


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