On 29.10.2012 20:44, Rose, John B wrote:
1) We are looking for simple examples, with source code, of a UI using HTML5
to query and add data to an SQLite database
2) We are also looking for examples using Javascript to query an existing
SQLite database. And maybe add data to an existing database. We do not care of
the database is on a server or local. We just want to put together a simple
mechanism using javascript as a query interface to an SQLite database.
We have read a bit about WebSQL, Web Storage and IndexedDB. We are a bit
confused.
Are one of those a requirement to interact with SQLite via Javascript? After a
reasonable bit of googling we have not found a simple javascript/SQLite example.
I am assuming that you are talking about client side SQLite DBs.
Unfortunately, the sad reality is that Web SQL Database [1] (i.e. SQLite
presence in any modern browser) has been abandoned as a standard in
favor of IndexedDB.
The main reasons (cited in various official and semi-official sources by
the Mozilla guys) are:
* Internet badly needs browser convergence over HTML5, but Microsoft
will never include exactly SQLite in IE for Windows, (the proposed
standard [1] roughly says "WebSQL in terms of query language and
behavior is ... SQLite 3.6.19")
* SQL is not the perfect language for the average JS developer.
Mozilla (Firefox) continues to use (quite inefficiently) SQLite as
IndexedDB backend, Chrome switched to LevelDB recently.
Meantime, you have the following options:
* Stick with IndexedDB, which do not support any query language - you
will need to render your queries to low level API calls manually,
like in the pre-SQL dark ages :-) (but IndexedDB is already supported
in all recent versions, natively [2] or by shim [3] on top of
SQLite/WebSQL [4]).
* Test for a project (and contribute to - e.g. filling bugs) Emscripten
SQLite [5] (C SQLite code compiled as JS using the new HTML5 typed
arrays as memory representation).
Sorry,
Alek
P.S. I am keeping the hope, that it is still possible to bring back
SQLite in the standard JS APIs, will be glad to discuss how we could try
to achieve the goal if anyone is interested.
[1] http://www.w3.org/TR/webdatabase/
[2] http://caniuse.com/#search=IndexedDB
[3] http://nparashuram.com/IndexedDBShim/
[4] http://caniuse.com/#search=WebSQL
[5] http://syntensity.com/static/sql.html
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