1 
console.log(db); //db object exists
console.log(db.objectStoreNames.contains('test')); //true - object store exists

var transaction = db.transaction(['test'], 'readwrite'); // this line is causing the error

A mutation operation was attempted on a database that did not allow mutations." code: "6

为什么我会收到此错误？我的数据库和对象存储存在吗？我快疯了！:D 非常感谢任何帮助！

谢谢

4

2 回答 2

1

I just try now on chrome, safari on Mac os x and found no error.

I do as follow on http://dev.yathit.com/ydn-db/using/schema.html (the page load ydn.db.Storage object)

schema = {stores: [{name: 'test'}]}
st = new ydn.db.Storage('test1', schema)
// ... wait for async
db = st.db()
db.transaction(['test'], 'readwrite')

old chrome use 1 instead 'readwrite', but i don't think it a reason.

于 2012-09-03T16:30:03.747 回答
0

有很多这样的错误发生。只有这篇文章http://dev.opera.com/articles/introduction-to-indexeddb/说明了原因-----“使用 IndexedDB，我们数据库上的每个操作或事务都必须发生在回调函数。”

这是我的简单示例，请使用 chrome 的 devtool->resource->indexedDB 进行检查；（如果 indexedDB 中没有任何内容，请尝试刷新浏览器）

html部分：

<form id="form1">
    <label for="task">What do you need to do?</label>
    <input type="text" name="task" id="task" value="" required>
    <button type="submit" id="submit">Save entry</button>
</form>

脚本部分：

var idb = indexedDB.open('niangzi10', 2);
    var dbobject; // Define a global variable to hold our database object
    idb.onsuccess = function (evt) {
        console.log("success");
        if (dbobject === undefined) {
            dbobject = evt.target.result;
        }
    }
    idb.onupgradeneeded = function (evt) {
        dbobject = evt.target.result;
        if (evt.oldVersion < 1) {
            dbobject.createObjectStore('tasks', { autoIncrement: true });
        }
    }
    //transaction operation in callback function
    var form1 = document.getElementById('form1');
    form1.addEventListener('submit', function (evt) {
        'use strict';
        evt.preventDefault();

        var entry = {}, transaction, objectstore, request;
        entry = { name: document.querySelector("#task").value };

        // Open a transaction for writing
        transaction = dbobject.transaction(['tasks'], 'readwrite');
        objectstore = transaction.objectStore('tasks');
        // Save the entry object
        request = objectstore.add(entry);
        transaction.oncomplete = function (evt) {
            alert("'" + document.querySelector("#task").value + "'has been insert into indexedDB;please check it using chrome's devtool->resource->indexedDB(if nothing,refresh browser)；");
        };

    });
于 2014-07-02T09:40:35.330 回答