Question

我正在使用IndexedDB，并在只想添加新对象的地方创建了此函数。

var request = indexedDB.open("db", 1);
request.onsuccess = function(event){
   request = event.target.result;
   var transaction = request.transaction(["cart"], "readwrite");
   var store = transaction.objectStore("cart");
   var obj = {
    w : w,
    x : x,
    y: y,
    z: z
   };
   var requestAdd = store.add(obj);
   requestAdd.onsuccess = function(w){
      console.log("great");         
   }
   request.close();
}

这是我创建索引和objectStore的方式

var storeCart = db.createObjectStore("cart", { autoIncrement : true });
        storeCart.createIndex("w", "w", {unique: false});
        storeCart.createIndex("x", "x", {unique: false});
        storeCart.createIndex("y", "y", {unique: false});
        storeCart.createIndex("z", "z", {unique: false});

但是，由于某种原因，当我尝试访问cart时出现此错误：

NotFoundError: The operation failed because the requested database object could not be found. For example, an object store did not exist but was being opened.

我该如何解决？

Answer 1

也许问题是您需要在request.onupgradeneeded事件中创建objectStore和索引。

要触发该事件，您需要首次创建indexedDB或在调用listoffiles = glob.glob('C:/Users/riley/Desktop/mydata//*.csv') #glob allows you to create a list of files/folders that match wildcard expression in this case all the csv files in the directory # Create donors directory donors = {} for filename in listoffiles: with open(filename) as file: for line in file: # line processing stuff data = line.split(',') donor = ''.join(data[3,5,7]) # populate data structure if donor in donors: donors[donor].append(data) else: donors[donor] = [[data]]时更改indexedDB版本：

indexedDB.open()

在IndexedDB中发出请求时出错

1 个答案: