在IndexedDB的对象库块UI中插入大量数据 [英] Inserting large quantities in IndexedDB's objectstore blocks UI

问题描述

我想在我的IndexedDB的对象库中保存一些〜35000个对象。

I want to save some ~35000 objects in my IndexedDB's objectstore. I am using below code to insert.

AddListings = function (x2j_list_new, callback) {   
    var transaction = db.transaction(["listings"], IDBTransaction.READ_WRITE);
    var count = 0;
    transaction.oncomplete = function (event) {
        if (callback) {
            console.log('x2jShowListing Added ' + count + '/' + x2j_list_new.length);
                callback([count, x2j_list_new.length]);
            }
    };
    transaction.onerror = function (e) {
       console.log("myError: ", e);  
       if (callback) {
          callback(false);
       }
    };
    var store = transaction.objectStore("listings");

    $.each(x2j_list_new, function (index0, item0) {
        var request = store.put(item0);
        request.onsuccess = function (event) {
            count++;
            // event.target.result  
            };
        });
    });        
};

上面的代码工作正常，但循环和插入超过35000个对象会导致UI无法响应〜200秒。我想也许我可以使用WebWorkers，但IndexedDB在WebWorkers内部不可用。我试图找到一种批量插入的方式，找不到一个。任何想法如何插入大量的对象，而不会阻止用户界面？

The above code works fine, but looping and inserting over ~35000 objects makes the UI unresponsive for ~200 seconds. I thought maybe i can use WebWorkers, but IndexedDB is not available inside WebWorkers. I tried to find a way to bulk insert, couldn't find one. Any ideas of how to insert large quantities of objects without blocking the UI?

推荐答案

您现在处于正确的轨道上，但您要求浏览器在存储35,000个对象之前有机会完成存储一个。这里是代码，它在开始下一个（但使用相同的事务）之前异步地等待一个请求完成：

You're on the right track, but you're asking the browser to store 35,000 objects before it's had a chance to finish storing one. Here's code which asynchronously waits for one request to finish before starting the next (but using the same transaction):

    openRequest = window.indexedDB.open("MyDatabase", 1);
    openRequest.onerror = function(event) {
        console.error(event);
    };
    openRequest.onsuccess = function (event) {
        var db = openRequest.result;
        db.onerror = function(event) {
            // Generic error handler for all errors targeted at this database's requests
            console.error(event.target);
            window.alert("Database error: " + event.target.wePutrrorMessage || event.target.error.name || event.target.error || event.target.errorCode);
        };
        var transaction = db.transaction('item', "readwrite");
        var itemStore = transaction.objectStore("item");
        putNext();

        function putNext() {
            if (i<items.length) {
                itemStore.put(items[i]).onsuccess = putNext;
                ++i;
            } else {   // complete
                console.log('populate complete');
                callback();
            }
        }           
    };      

这篇关于在IndexedDB的对象库块UI中插入大量数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！