Delete method is not working for Indexed DB HTML5… It returns success but the record is not deleted

问题

Another problem that I am getting with Indexed DB for HTML5, using Desktop Chrome, is that I can not delete a record from an object store. The onsuccess event is triggered but the record is still there... My ID is a time stamp just because I wanted to achieve a working app faster. I hardcoded it but it still does not work. It is really strange because the onsuccess event is triggered...

The part of the code that "does it" is the following:

try {

        if (localDatabase != null && localDatabase.db != null) 
        {
            var store = localDatabase.db.transaction("patients", "readwrite").objectStore("patients");
            var request = store.delete("1384882073632");

            request.onsuccess = function(event) 
            {


                alert("Patient deleted from DB");
                update_patients_stored();

                aux1.value = "";
                aux2.value = "";
                aux3.value = "";
                aux4.value = "";

            };

            request.onerror = function(event) 
            {
                alert("Error deleting");
            };
        }
    }
    catch(e)
    {
        alert(e);
    }

Thank you in advance!

回答1:

I've found a similar problem. Non-deleting behaviour but onsuccess event fired. Despite w3 IDBObjectStore.delete specification states key parameter can be of any type, I solved it forcing the parameter conversion to number:

//My version
//I use default autoIncrement for keys
var objectStore = db.createObjectStore(objStoreName,{autoIncrement:true});
//appears to need a number for the key (but retrieved from HTML as string
var request = db.transaction(objStoreName,'readwrite')
                    .objectStore(objStoreName)
                    .delete(Number(parent.id));
    request.onsuccess = function(e) {
        console.log("element deleted"); //sadly this always run :-(
    }

So your line four should be:

var request = store.delete(1384882073632); //integer id
//rather than (WRONG):
//var request = store.delete("1384882073632"); //WRONG! string id

Tried it on:

Chromium -- Version 50.0.2661.94 (64-bit) on Manjaro Linux

Have not tested it on other environments or browsers, but guess that's your problem.

回答2:

I am sure you are deleting to wrong key. Note that number, string and date are different keys even if they are same if you compare with ==.

IndexedDB return success as long as it does not violate database constraint. In this case not deleting any record. I have propose to return number of deleted record on delete request, but not favored. My library, ydn-db, did it, of course.

来源：https://stackoverflow.com/questions/20078724/delete-method-is-not-working-for-indexed-db-html5-it-returns-success-but-the

标签

javascript

html5

google-chrome

indexeddb