// index.db.js
;
window.indexedDB = window.indexedDB ||
window.mozIndexedDB ||
window.webkitIndexedDB ||
window.msIndexedDB;
window.IDBTransaction = window.IDBTransaction ||
window.webkitIDBTransaction ||
window.msIDBTransaction;
window.IDBKeyRange = window.IDBKeyRange ||
window.webkitIDBKeyRange ||
window.msIDBKeyRange;
(function(window){
'use strict';
var db = {
version: 1, // important: only use whole numbers!
objectStoreName: 'tasks',
instance: {},
upgrade: function (e) {
var
_db = e.target.result,
names = _db.objectStoreNames,
name = db.objectStoreName;
if (!names.contains(name)) {
_db.createObjectStore(
name,
{
keyPath: 'id',
autoIncrement: true
});
}
},
errorHandler: function (error) {
window.alert('error: ' + error.target.code);
debugger;
},
open: function (callback) {
var request = window.indexedDB.open(
db.objectStoreName, db.version);
request.onerror = db.errorHandler;
request.onupgradeneeded = db.upgrade;
request.onsuccess = function (e) {
db.instance = request.result;
db.instance.onerror =
db.errorHandler;
callback();
};
},
getObjectStore: function (mode) {
var txn, store;
mode = mode || 'readonly';
txn = db.instance.transaction(
[db.objectStoreName], mode);
store = txn.objectStore(
db.objectStoreName);
return store;
},
save: function (data, callback) {
db.open(function () {
var store, request,
mode = 'readwrite';
store = db.getObjectStore(mode),
request = data.id ?
store.put(data) :
store.add(data);
request.onsuccess = callback;
});
},
getAll: function (callback) {
db.open(function () {
var
store = db.getObjectStore(),
cursor = store.openCursor(),
data = [];
cursor.onsuccess = function (e) {
var result = e.target.result;
if (result &&
result !== null) {
data.push(result.value);
result.continue();
} else {
callback(data);
}
};
});
},
get: function (id, callback) {
id = parseInt(id);
db.open(function () {
var
store = db.getObjectStore(),
request = store.get(id);
request.onsuccess = function (e){
callback(e.target.result);
};
});
},
'delete': function (id, callback) {
id = parseInt(id);
db.open(function () {
var
mode = 'readwrite',
store, request;
store = db.getObjectStore(mode);
request = store.delete(id);
request.onsuccess = callback;
});
},
deleteAll: function (callback) {
db.open(function () {
var mode, store, request;
mode = 'readwrite';
store = db.getObjectStore(mode);
request = store.clear();
request.onsuccess = callback;
});
}
};
window.app = window.app || {};
window.app.db = db;
}(window));
http://blog.csdn.net/qq_24147051/article/details/52917587 学习
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