103 lines
No EOL
3 KiB
HTML
103 lines
No EOL
3 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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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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let seed = 13423;
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function prn() {
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let x = Math.sin(seed++) * 10000;
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return x - Math.floor(x);
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}
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function pad(str, len) {
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return str + " ".repeat(len - str.length);
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}
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function formatByteArray(a) {
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return `[${Array.from(a).join(",")}]`;
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}
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async function main() {
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let isNew = false;
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const openReq = window.indexedDB.open("bin_key_sorting_test", 1);
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openReq.onupgradeneeded = (ev) => {
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const db = ev.target.result;
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db.createObjectStore("test", {keyPath: ["binKey"]});
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isNew = true;
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};
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const db = await reqAsPromise(openReq);
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// fill test store with some data
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if (isNew) {
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const txn = db.transaction("test", "readwrite");
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const store = txn.objectStore("test");
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const rndByte = () => Math.ceil(prn() * 255);
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for(let i = 0; i < 10; ++i) {
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const b1 = rndByte(), b2 = rndByte(), b3 = rndByte(), b4 = rndByte();
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console.log(`adding key (${b1},${b2},${b3},${b4})`);
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store.add({binKey: new Uint8Array([b1, b2, b3, b4])});
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}
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store.add({binKey: new Uint8Array([0x80, 0x00, 0x00, 0x00])});
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store.add({binKey: new Uint8Array([0x00, 0x00, 0x00, 0x00])});
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store.add({binKey: new Uint8Array([0x7F, 0xFF, 0xFF, 0xFF])});
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store.add({binKey: new Uint8Array([0xFF, 0xFF, 0xFF, 0xFF])});
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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 range = IDBKeyRange.upperBound(
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// Uint8Array.from([0x00, 0x00, 0x00, 0x00]).buffer,
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Uint8Array.from([0xFF, 0xFF, 0xFF, 0xFF]).buffer,
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// new Uint8Array([0x80, 0x00, 0x00, 0x00]).buffer, new
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// Uint8Array([0x7F, 0xFF, 0xFF, 0xFF]).buffer,
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false
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);
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// const values = await readAll(store.openCursor(range, "next"));
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const values = await readAll(store.openCursor(range, "prev"));
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console.log(pad(`[uint8;4]`, 20) + " [int8;4]");
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for (const v of values) {
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const uintStr = formatByteArray(new Uint8Array(v.binKey));
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const intStr = formatByteArray(new Int8Array(v.binKey));
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console.log(pad(uintStr, 20) + " " + intStr);
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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> |