forked from mystiq/hydrogen-web
74 lines
No EOL
2.2 KiB
HTML
74 lines
No EOL
2.2 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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</head>
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<body>
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<script type="module">
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function reqAsPromise(req) {
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return new Promise((resolve, reject) => {
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req.addEventListener("success", event => resolve(event.target.result));
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req.addEventListener("error", event => reject(event.target.error));
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});
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}
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function txnAsPromise(txn) {
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return new Promise((resolve, reject) => {
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txn.addEventListener("complete", resolve);
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txn.addEventListener("abort", reject);
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});
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}
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export function readAll(cursor) {
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return new Promise((resolve, reject) => {
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const results = [];
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cursor.onerror = (event) => {
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reject(new Error("Query failed: " + event.target.errorCode));
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};
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cursor.onsuccess = (event) => {
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const cursor = event.target.result;
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if (!cursor) {
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resolve(results);
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} else {
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results.push(cursor.value);
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cursor.continue();
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}
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};
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});
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}
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async function main() {
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let isNew = false;
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const openReq = window.indexedDB.open("composed_binary_keys_test", 1);
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openReq.onupgradeneeded = (ev) => {
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const db = ev.target.result;
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db.createObjectStore("test", {keyPath: ["strKey", "binKey"]});
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isNew = true;
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};
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const db = await reqAsPromise(openReq);
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// fill test store with some initial data
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if (isNew) {
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const txn = db.transaction("test", "readwrite");
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const store = txn.objectStore("test");
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store.add({strKey: "abc", binKey: new Uint8Array([0x0F, 0x00, 0x10, 0x00]).buffer});
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store.add({strKey: "def", binKey: new Uint8Array([0x00, 0x10, 0x00, 0x00]).buffer});
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store.add({strKey: "def", binKey: new Uint8Array([0xFF, 0x10, 0x00, 0x00]).buffer});
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store.add({strKey: "ghi", binKey: new Uint8Array([0x00, 0x00, 0x40, 0x00]).buffer});
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await txnAsPromise(txn);
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}
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const txn = db.transaction("test", "readonly");
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const store = txn.objectStore("test");
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const defRange = IDBKeyRange.bound(
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["def", new Uint8Array([0x00, 0x00, 0x00, 0x00]).buffer],
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["def", new Uint8Array([0xFF, 0xFF, 0xFF, 0xFF]).buffer],
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true, true,
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);
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const defValues = await readAll(store.openCursor(defRange, "prev"));
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console.log(defValues);
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}
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main();
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</script>
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</body>
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</html> |