How to export to IndexedDB?

[maxzhuo]

How does DuckDB-wasm save a database to IndexedDB and reload the database in IndexedDB after refreshing the page? Please write a code example, thanks.

[ravwojdyla]

@maxzhuo see #1490 (comment) for some summary of relevant past discussions and the PR itself is directly relevant.

[maxzhuo]

I tried running it on the console：

await db.open({
    path: 'opfs://test.db',
    accessMode: duckdb.DuckDBAccessMode.READ_WRITE,
});
const conn = await db.connect();

After running, two warnings were displayed：

⚠️ ▷ Buffering missing file: opfs://test.db
⚠️ ▷ Buffering missing file: opfs://test.db.wal

[maxzhuo]

Is test.db automatically created?
Do I need an additional JavaScript code to create test.db in advance?