Question

我曾尝试研究类似的案例，但没有任何事情与我所经历的相符。请考虑以下内容：

var req = indexedDB.open("myDatabase", 1);
req.onupgradeneeded = function (evt) {
   var objStore = evt.target.result.createObjectStore("customers", { keyPath: "ID", autoIncrement: true });
   objStore.createIndex("fName", "fName", { unique: false });
   objStore.createIndex("lName", "lName", { unique: false });
   objStore.createIndex("country", "country", { unique: false });
   var obj1 = { fName: "James", lName: "Smith", age: 25, country: "United States", reviewStatus: "pending" };
   var obj2 = { fName: "Tim", lName: "Jones", age: 32, country: "Canada", reviewStatus: "pending"};
   var obj3 = { fName: "James", lName: "Miller", age: 22, country: "United States", reviewStatus: "pending"};
   var obj4 = { fName: "James", lName: "Thompson", age: 40, country: "United Kingdom", reviewStatus: "pending"};
   var obj5 = { fName: "Joseph", lName: "Harris", age: 28, country: "Canada", reviewStatus: "pending"};
   var obj6 = { fName: "James", lName: "Jackson", age: 30, country: "United States", reviewStatus: "pending"};
   objStore.add(obj1);
   objStore.add(obj2);
   objStore.add(obj3);
   objStore.add(obj4);
   objStore.add(obj5);
   objStore.add(obj6);
};
req.onsuccess = function (evt) {
   var tx = this.result.transaction("customers", "readwrite");
   var objStore = tx.objectStore("customers");
   var index = objStore.index("fName");
   var cnt = index.count(IDBKeyRange.only("James"));
   cnt.onsuccess = function () {
      console.log(cnt.result + " records with fName: James");
   };
   var cursor = index.openCursor(IDBKeyRange.only("James"));
   cursor.onsuccess = function (e) {
      var record = e.target.result;
      if (record) {
         var updateData = record.value;
         updateData.reviewStatus = "reviewed";
         //update some other fields

         var updateReq = record.update(updateData);
         console.log("updating record");
         record.continue();
      }
   };
   cursor.onerror = function () {
      console.log("error using cursor");
   };

   tx.oncomplete = function () {
     console.log("got to transaction oncomplete");
     //do other work required once cursor updates done
   };
   tx.onerror = function () {
      console.log("error in transaction");
   };
};
req.onerror = function () {
    console.log("error opening database");
};

我的数据库有4条记录，其中fName =“ James”。我使用Chrome（v71）首先对其进行测试并获得结果：

4条带有fName的记录：James
更新记录
更新   记录
更新记录
更新记录
  交易未完成

随后在Firefox（v64），Opera（v56）和Chrome for Android上进行的测试均产生了这些预期结果。当我在iOS（11.4）上进行测试时，得到的结果是：

4条带有fName：James的记录
更新记录
交易未完成

我的onerror函数中没有任何控制台错误或任何消息。我无法弄清楚为什么在iOS中只更新第一条记录，而光标却没有移动到其他记录。我不知道我的代码中是否有错误，或者这是iOS中的某种错误？

Answer 1

好像是Safari中的错误。我在这里https://bugs.webkit.org/show_bug.cgi?id=192987提交了一个错误报告-希望他们会在不久的将来对其进行修复！

在iOS上更新后，IndexedDB游标没有得到下一条记录

1 个答案: