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To: python-list@python.org
From: Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject: Re: 'Lite' Databases (Re: sqlite3 and dates)
Date: Thu, 19 Feb 2015 15:04:47 +0000
References: <mc1atd$cq0$1@ger.gmane.org> <mailman.18805.1424243139.18130.python-list@python.org> <mc1s1e$feh$1@news.albasani.net> <mailman.18815.1424258499.18130.python-list@python.org> <4154cc37-0bb0-4bf2-a52c-b728c737357c@googlegroups.com> <CAPTjJmogRj_==1wUcLooFwDhUK+saSaAkQEuUo4o30n8aRdB=w@mail.gmail.com> <54E517B4.4000409@stoneleaf.us> <mailman.18843.1424302365.18130.python-list@python.org> <qt8aeaprecp11btjfiaht8q8d7mh6osqpv@4ax.com> <mc3shp$215$1@ger.gmane.org> <20150219081758.3dbe83ca@bigbox.christie.dr>
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On 19/02/2015 14:17, Tim Chase wrote:
> On 2015-02-19 05:32, Mark Lawrence wrote:
>> On 19/02/2015 00:08, Mario Figueiredo wrote:
>>> Parameterized queries is just a pet peeve of mine that I wish to
>>> include here. SQLite misses it and I miss the fact SQLite misses
>>> it. The less SQL one needs to write in their code, the happier
>>> one should be.
>>
>> Instead, use the DB-API’s parameter substitution. Put ? as a
>> placeholder wherever you want to use a value, and then provide a
>> tuple of values as the second argument to the cursor’s execute()
>> method. (Other database modules may use a different placeholder,
>> such as %s or :1.) For example:..."
>
> I think Mario was referring to what other back ends call prepared
> statements. So you do something like
>
>
>    sql = "..." # parameters are referenced here
>    conn = sqlite3.connect(...)
>    stmt = conn.prepare(sql)
>    for parameters in list_of_parameters:
>      stmt.execute(*parameters)
>
> This saves the SQL processor from recompiling the SQL into internal
> byte-code every time.  It's handy if you know a given query will run
> multiple times with the same "shape" parameters.  It's not essential,
> and some optimize away the need, but many back-end interfaces support
> it.
>
> -tkc
>

Is this 
https://docs.python.org/3/library/sqlite3.html#sqlite3.Cursor.executemany an 
equivalent?

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence