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From Daniel Gruno <>
Subject Re: [Discuss] mod_lua and database connectivity
Date Sun, 06 Jan 2013 18:21:34 GMT
On 01/06/2013 04:23 PM, Stefan Fritsch wrote:
> On Sun, 6 Jan 2013, Daniel Gruno wrote:
>> Now I just have to take a good look at how to rewrite the prepared
>> statement stuff, and I believe I'll have a decent proposal ready for
>> commit :)
> I am a bit late in the discussion, but maybe you also want to support
> using statements that have been prepared with DBDPrepareSQL from mod_dbd?
> Other important things (but I think these have already been pointed out):
> - don't let lua scripts open connections, instead make them aquire
> connections from mod_dbd's connection pool.
> - use parametrized prepared statements in all examples and make that as
> easy to use as possible. Don't show any examples that put parameters
> directly into the statement strings.
First off, I should mention that mod_dbd is indeed supported in the
proposal, in fact, I use only mod_dbd for my own Lua stuff.

As per our discussion on IRC, I have made some additions to the prepared
statements, so that statements prepared using DBDPrepareSQL can also be
fetched using db:prepared(r, tag). Thus prepared statements can be used
in two ways:

-- Regular prepared statement creation:
local prepped, err = db:prepare("SELECT * FROM `tbl` WHERE `id` = %s")
if not err then
    local result, err = prepped("foobar") -- insert foobar as id

-- Fetch from DBDPrepareSQL:
local prepped, err = db:prepared("someTag")
if not err then
    local result, err = prepped("foobar") -- insert foobar as id

This and the rest is discussed in my draft for the docs changes, which
can be found at:

I hope you guys will review it and let me know if you think it's time to
actually commit the code ;)

With regards,

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