[英]large amount of data into indexedDB in Firefox OS
我想將大量數據插入到indexedDB數據庫中。
數據大小約為5MB。
並超過77,000行。
我將數據庫轉換為“ all.js”文件,如下所示:
const AllData = [
{ id: 1, en: "10th", ar: "arabic word" },
{ id: 2, en: "1st", ar: "arabic word" },
{ id: 3, en: "2nd", ar: "arabic word" },
{ id: 4, en: "3rd", ar: "arabic word" },
{ id: 5, en: "4th", ar: "arabic word" },
{ id: 6, en: "5th", ar: "arabic word" },
{ id: 7, en: "6th", ar: "arabic word" },
{ id: 8, en: "7th", ar: "arabic word" },
{ id: 9, en: "8th", ar: "arabic word" },
to about 77,000
];
還有我的HTML和JavaScript代碼
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="all.js" type="text/javascript"></script>
<script type="text/javascript">
/*
var custom = [
{"id":1 ,"name":"hussein","email":"test@gmail.com"},
{"id":2 ,"name":"ali","email":"test2@gmail.com"}
];
*/
var db;
var request = window.indexedDB.open("YesData13", 1);
request.onerror = function(event) {
alert("Why didn't you allow my web app to use IndexedDB?!");
};
request.onsuccess = function(event) {
db = event.target.result;
/*
var transaction = db.transaction(["data"], "readwrite");
transaction.oncomplete = function(event) {
alert("All done!");
};
transaction.onerror = function(event) {
// Don't forget to handle errors!
};
var objectStore = transaction.objectStore("data");
for (var i in AllData) {
var request = objectStore.add(AllData[i]);
request.onsuccess = function(event) {
// event.target.result == customerData[i].ssn;
};
}
*/
};
request.onupgradeneeded = function(event) {
var db = event.target.result;
var objectStore = db.createObjectStore("data", { keyPath: "id" });
//objectStore.createIndex("en","en",{unique:true});
//objectStore.createIndex("ar","ar",{unique:false});
for (var i in AllData){
objectStore.put(AllData[i])
}
};
/*
for (var i in AllData) {
var request = objectStore.add(AllData[i]);
request.onsuccess = function(event) {
// event.target.result == customerData[i].ssn;
};
}
*/
function read() {
var transaction = db.transaction(["data"]);
var objectStore = transaction.objectStore("data");
var request = objectStore.get(25001);
request.onerror = function(event) {
alert("Unable to retrieve daa from database!");
};
request.onsuccess = function(event) {
// Do something with the request.result!
if(request.result) {
alert("id: " + request.result.id + ", English: " + request.result.en + ", arabic: " + request.result.ar);
} else {
alert("Kenny couldn't be found in your database!");
}
};
}
</script>
</head>
點擊這里
上面的代碼在firefox和google chrome中以及所有插入的行中都能很好地工作。 但是當在firefox os模擬器中嘗試時,它不起作用;當嘗試將行減少到25,000時,它可以正常工作。
我嘗試將其拆分成每個文件大約25000個文件,僅添加前25,000個,但不添加25,000個
從我自己在firefox os上對indexedDB進行的實驗來看,模擬器似乎對可以使用indexedDB存儲的數據量施加了相當小的限制。 我嘗試編寫腳本以將一堆隨機數據添加到單個數據庫中,並且模擬器沒有給我一個錯誤,但是它停止了大約12,000個條目后才允許我添加數據。 但是,如果我嘗試使用模擬器創建新數據庫,則會出現錯誤,提示超出配額。
但是,當我在電話上運行所有這些功能時,它一直在運行,我懷疑模擬器不能代表實際設備,因為Firefox應用程序沒有施加indexedDB限制。 因此,如果您可以進行測試,則您的應用應該可以在設備上運行。
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