Question

问题是当你在同一个indexeddb中有两个不同的对象存储时，主键值似乎是＆＃34;共享＆＃34;遍布所有商店。

<body>
    <script type="text/javascript">
        //prefixes of implementation that we want to test
window.indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;

//prefixes of window.IDB objects
window.IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction || window.msIDBTransaction;
window.IDBKeyRange = window.IDBKeyRange || window.webkitIDBKeyRange || window.msIDBKeyRange

if (!window.indexedDB) {
    window.alert("Your browser doesn't support a stable version of IndexedDB.")
}


var db;
var request = window.indexedDB.open("newDatabase", 4);

request.onerror = function(event) {
  console.log("error: ");
};

request.onsuccess = function(event) {
  db = request.result;
  console.log("success: "+ db);
};

request.onupgradeneeded = function(event) {
        var db = event.target.result;
        var objectStore = db.createObjectStore("customers", {keyPath: "arseid"});
    var objectStore = db.createObjectStore("test", {keyPath: "id"});
}



function add1() {
        var x = new Date();
    var h1 = x.getHours();
    var m1 = x.getMinutes();
    var s1 = x.getSeconds();
    console.log('starting insert on ' +  h1 + ':' + m1 + ':' + s1);

    var tx = db.transaction(["customers"], "readwrite");
    for (var i = 0; i < 1000; i++) {
        var request = tx.objectStore("customers")
                .put({ arseid: i, name: "Jonathan Smith", email: "jonathan.smith@anemailaddress.com", favourite: "chocolate cake", pet: "rudolph the red nose reindeer", address: "999 letsbe avenue, townton, countyshire" });
    }


    tx.oncomplete = function (e) {
            // Re-render all the todo's
            var x2 = new Date(); 
            var h2 = x2.getHours(); 
            var m2 = x2.getMinutes(); 
            var s2 = x2.getSeconds(); 
               console.log('transaction complete ' + h2 + ':' + m2 + ':' + s2);
        }
}


function add2() {
    //tx 2
    var tx2 = db.transaction(["test"], "readwrite");
    for (var i = 0; i < 1000; i++) {
        var request2 = tx2.objectStore("test")
                .put({ id: i, name: "Robwin Mwengway", email: "jonathan.smith@anemailaddress.com", favourite: "chocolate cake", pet: "rudolph the red nose reindeer", address: "999 letsbe avenue, townton, countyshire" });
    }

    tx2.oncomplete = function (e) {
            var x3 = new Date(); 
            var h3 = x3.getHours(); 
            var m3 = x3.getMinutes(); 
            var s3 = x3.getSeconds(); 
               console.log('transaction complete ' + h3 + ':' + m3 + ':' + s3);
        }
}


    </script>
<button onclick="add1()">Add1 data to indexedDb</button>
<button onclick="add2()">Add2 data to indexedDb</button>
</body>

（小提琴：http://jsfiddle.net/jonnyknowsbest/4pdp8vxe/）

在iOS8中，如果你运行小提琴并点击＆＃34;将1数据添加到IndexedDb＆＃34;，则会有1000个条目被添加到＆＃34;客户＆＃34;表。然后，如果您单击＆＃34;将2数据添加到IndexedDb＆＃34;，则会将1000个条目添加到＆＃34;供应商＆＃34;表，但来自＆＃34;客户＆＃34;被删除了。

还有其他人遇到过这个吗？这是IndexedDb规范的一部分吗？ Chrome似乎没有这个问题。

编辑：找到这个W3 Org IndexedDB Recommendation：＆＃34;在给定的对象商店中，永远不会有多个具有相同密钥的记录。＆＃34; Apple似乎已经在数据库级别应用了它。

Answer 1

我可以确认iOS8肯定是错误的。我尝试了一些解决方法，但我能建议的最好的是一个主键，它将一些唯一的字符串（如objectStore的名称）与一个数字组合在一起。因此，例如，给定两个名为people和notes的objectStore，我将使用如下的键存储数据：

人/ X 笔记/ X

您可以手动设置X，或者使用objectStore上的.count（）方法查找计数并添加一个。这是一个例子：

//Define a person
var person = {
    name:"Ray",
    created:new Date().toString(),
}

//Perform the add
db.transaction(["people"],"readwrite").objectStore("people").count().onsuccess = function(event) {
    var total = event.target.result;
    console.log(total);
    person.id = "person/" + (total+1);

    var request = db.transaction(["people"],"readwrite").objectStore("people").add(person);

    request.onerror = function(e) {
        console.log("Error",e.target.error.name);
        //some type of error handler
    }

    request.onsuccess = function(e) {
        console.log("Woot! Did it");
    }

}

请注意，我为此操作系统指定了“id”的keyPath。

Answer 2

我有一个类似的问题但是我对objectstore的第一个插入是一个只有用户名和电子邮件的小数组，而第二个对象库非常大，有几个嵌套的数据数组。

下面的插入方法会在所有项目上回调成功，但只有第二个对象存储区才能正确写入数据库。

当我尝试颠倒我写入数据库的顺序（首先写入大型对象库项目，然后写入用户名/电子邮件）时，两个对象库都被正确写入，但主键在两个对象库之间共享。飞行员主要钥匙：1,2,3,4,5 AC主键：6,7,8 ......

function insert_GroupRecord(Record, Store){
    //update individual sync record
    var trans = dbGroup.transaction([Store],"readwrite");
    var store = trans.objectStore(Store);
    var request = store.put(Record);
    request.onsuccess = function(e){
        IOS_postMessage({Message:"SyncStatus", status:"Group_Insert "+Store});
    };
    request.onerror = function(e){
        GroupSyncERROR = true;
        //IOS_postMessage({Message:"SyncStatus", status:"GroupSyncFail "+Store});
    };

    request.onupgradeneeded = function(evt){
        var objectStore = evt.currentTarget.result.createObjectStore("AC",{ keyPath: "id", autoIncrement: true });
        objectStore.createIndex("ident", "ident", { unique: true });
        var objectStore2 = evt.currentTarget.result.createObjectStore("Pilots",{ keyPath: "id", autoIncrement: true });
        objectStore2.createIndex("chatname", "chatname", { unique: true });
        console.log("KFM_Group Upgrade Completed");

    };
}

iOS8实现IndexedDb的主要关键问题

2 个答案: