75 lines
2.2 KiB
HTML
75 lines
2.2 KiB
HTML
<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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</head>
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<body>
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<script type="text/javascript">
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function reqAsPromise(req) {
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return new Promise((resolve, reject) => {
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req.onsuccess = () => resolve(req);
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req.onerror = (err) => reject(err);
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});
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}
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class Storage {
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constructor(databaseName) {
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this._databaseName = databaseName;
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this._database = null;
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}
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async open() {
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const req = window.indexedDB.open(this._databaseName);
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req.onupgradeneeded = (ev) => {
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const db = ev.target.result;
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const oldVersion = ev.oldVersion;
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this._createStores(db, oldVersion);
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};
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await reqAsPromise(req);
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this._database = req.result;
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}
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_createStores(db) {
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db.createObjectStore("files", {keyPath: ["idName"]});
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}
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async storeFoo(id, name) {
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const tx = this._database.transaction(["files"], "readwrite");
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const store = tx.objectStore("files");
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await reqAsPromise(store.add(value(id, name)));
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}
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}
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function value(id, name) {
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return {idName: key(id, name)};
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}
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function key(id, name) {
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return id+","+name;
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}
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async function main() {
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let storage = new Storage("idb-multi-key2");
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try {
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await storage.open();
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await storage.storeFoo(5, "foo");
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await storage.storeFoo(6, "bar");
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alert("all good");
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} catch(err) {
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alert(err.message);
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}
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try {
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const result = indexedDB.cmp(key(5, "foo"), key(6, "bar"));
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//IDBKeyRange.bound(["aaa", "111"],["zzz", "999"], false, false);
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alert("all good: " + result);
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} catch (err) {
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alert(`IDBKeyRange.bound: ${err.message}`);
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}
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}
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main();
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</script>
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</body>
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</html>
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