[whatwg] executeSql API is synchronous
ian at hixie.ch
Mon Sep 24 18:14:49 PDT 2007
On Wed, 8 Aug 2007, Maciej Stachowiak wrote:
> The executeSql() API returns a result synchronously. In general, SQL
> databases may be slow to access since they need to be read from disk,
> and if the database is not open already there's unlikely to be a ready
> cache. This may make it hard to use the executeSql() API without
> blocking the UI. All other HTML DOM operations that may require I/O to
> complete are asynchronous, with the exception of synchronous
> XMLHttpRequest which (a) causes UI lockup problems in practice and (b)
> at least has an async variant.
I've changed the API to be async.
On Wed, 8 Aug 2007, Aaron Boodman wrote:
> FWIW, We (the gears team) considered adding an async version of our sql
> execute() method, but decided against it in favor of improving the
I don't think we want to require all database access to go through a
worker pool. But I agree we will want synchronous APIs in a worker pool
On Thu, 20 Sep 2007, Timothy Hatcher wrote:
> The pain of asynchronous access can be alleviated or even solved with an
> API for transactions, or a group of SQL queries that need be executed in
> order. Commonly, if a transaction fails in the middle, the database is
> rolled-back to the state before the transaction started.
> There can then be a callback when the transaction finished or fails,
> with details on what query failed.
I've also added support for implicit transactions.
On Thu, 20 Sep 2007, Aaron Boodman wrote:
> It sounds like what you're talking about is something like:
> var tx = new Transaction();
> tx.addStatement("insert into accounts values (?, ?)", ["foo", "bar"]);
> tx.addStatement("update persons set name = ?, age = ?", ["bob", 42]);
> tx.executeAsync(callback, errback);
> This only works so long as you can construct all the sql calls ahead of
> time. If any calls depend on the results of previous ones, you need
> something like a worker.
> But I agree that the api needs support for transactions, I wanted to
> start another thread about that.
I'll respond on that thread.
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