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Re: 'Lite' Databases (Re: sqlite3 and dates)

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Date Thu, 19 Feb 2015 08:17:58 -0600
From Tim Chase <python.list@tim.thechases.com>
To Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject Re: 'Lite' Databases (Re: sqlite3 and dates)
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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

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Thread

Re: sqlite3 and dates Chris Angelico <rosuav@gmail.com> - 2015-02-18 18:05 +1100
  Re: sqlite3 and dates Johannes Bauer <dfnsonfsduifb@gmx.de> - 2015-02-18 12:11 +0100
    Re: sqlite3 and dates Chris Angelico <rosuav@gmail.com> - 2015-02-18 22:21 +1100
      Re: sqlite3 and dates Johannes Bauer <dfnsonfsduifb@gmx.de> - 2015-02-18 12:57 +0100
        Re: sqlite3 and dates Chris Angelico <rosuav@gmail.com> - 2015-02-18 23:14 +1100
          Re: sqlite3 and dates Johannes Bauer <dfnsonfsduifb@gmx.de> - 2015-02-18 14:13 +0100
          Not sqlite3 and dates Steve Hayes <hayesstw@telkomsa.net> - 2015-02-19 04:53 +0200
        Re: sqlite3 and dates Adam Funk <a24061@ducksburg.com> - 2015-02-19 13:18 +0000
      Re: sqlite3 and dates rurpy@yahoo.com - 2015-02-18 14:17 -0800
        Re: sqlite3 and dates Chris Angelico <rosuav@gmail.com> - 2015-02-19 09:37 +1100
          Not sqlite3 and dates Steve Hayes <hayesstw@telkomsa.net> - 2015-02-19 04:54 +0200
          Re: sqlite3 and dates Adam Funk <a24061@ducksburg.com> - 2015-02-19 13:21 +0000
        Re: sqlite3 and dates Ethan Furman <ethan@stoneleaf.us> - 2015-02-18 14:52 -0800
        'Lite' Databases (Re: sqlite3 and dates) memilanuk <memilanuk@gmail.com> - 2015-02-18 15:32 -0800
          Re: 'Lite' Databases (Re: sqlite3 and dates) Mario Figueiredo <marfig@gmail.com> - 2015-02-19 01:08 +0100
            Re: 'Lite' Databases (Re: sqlite3 and dates) Chris Angelico <rosuav@gmail.com> - 2015-02-19 11:42 +1100
              Re: 'Lite' Databases (Re: sqlite3 and dates) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-19 13:13 +1100
                Re: 'Lite' Databases (Re: sqlite3 and dates) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-19 03:43 +0000
                Re: 'Lite' Databases (Re: sqlite3 and dates) Mario Figueiredo <marfig@gmail.com> - 2015-02-19 08:49 +0100
                Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-18 20:10 -0800
                Re: 'Lite' Databases (Re: sqlite3 and dates) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-19 18:07 +1100
                Re: 'Lite' Databases (Re: sqlite3 and dates) Chris Angelico <rosuav@gmail.com> - 2015-02-19 18:23 +1100
                Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-19 12:26 -0800
                Re: 'Lite' Databases (Re: sqlite3 and dates) Chris Angelico <rosuav@gmail.com> - 2015-02-20 07:47 +1100
                Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-19 20:20 -0800
                Re: 'Lite' Databases (Re: sqlite3 and dates) Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-02-20 09:16 -0500
                Re: 'Lite' Databases (Re: sqlite3 and dates) Sibylle Koczian <nulla.epistola@web.de> - 2015-02-21 11:44 +0100
                Re: 'Lite' Databases (Re: sqlite3 and dates) Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-02-21 12:54 -0500
                Re: 'Lite' Databases (Re: sqlite3 and dates) Mario Figueiredo <marfig@gmail.com> - 2015-02-19 22:23 +0100
                Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-19 20:27 -0800
                Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-19 12:20 -0800
            Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-18 20:05 -0800
              Re: 'Lite' Databases (Re: sqlite3 and dates) Tim Chase <python.list@tim.thechases.com> - 2015-02-19 08:21 -0600
            Re: 'Lite' Databases (Re: sqlite3 and dates) Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-19 18:22 +1300
              Re: 'Lite' Databases (Re: sqlite3 and dates) Mario Figueiredo <marfig@gmail.com> - 2015-02-19 08:33 +0100
            Re: 'Lite' Databases (Re: sqlite3 and dates) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-19 05:32 +0000
            Re: 'Lite' Databases (Re: sqlite3 and dates) Tim Chase <python.list@tim.thechases.com> - 2015-02-19 08:17 -0600
            Re: 'Lite' Databases (Re: sqlite3 and dates) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-19 15:04 +0000
            Re: 'Lite' Databases (Re: sqlite3 and dates) Chris Angelico <rosuav@gmail.com> - 2015-02-20 02:19 +1100
            Re: 'Lite' Databases (Re: sqlite3 and dates) Tim Chase <python.list@tim.thechases.com> - 2015-02-19 10:03 -0600
              Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-19 11:45 -0800
        Re: 'Lite' Databases (Re: sqlite3 and dates) Ben Finney <ben+python@benfinney.id.au> - 2015-02-19 11:03 +1100
          Re: 'Lite' Databases (Re: sqlite3 and dates) Paul Rubin <no.email@nospam.invalid> - 2015-02-20 13:17 -0800
            Re: 'Lite' Databases (Re: sqlite3 and dates) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-20 21:44 +0000
            Re: 'Lite' Databases (Re: sqlite3 and dates) Ethan Furman <ethan@stoneleaf.us> - 2015-02-20 14:10 -0800
            Re: 'Lite' Databases (Re: sqlite3 and dates) Chris Angelico <rosuav@gmail.com> - 2015-02-21 12:24 +1100
            Re: 'Lite' Databases Ben Finney <ben+python@benfinney.id.au> - 2015-02-21 14:13 +1100
            Re: 'Lite' Databases (Re: sqlite3 and dates) Tim Chase <python.list@tim.thechases.com> - 2015-02-20 15:31 -0600
            Re: 'Lite' Databases Chris Angelico <rosuav@gmail.com> - 2015-02-21 16:39 +1100
            Re: 'Lite' Databases (Re: sqlite3 and dates) Ned Deily <nad@acm.org> - 2015-02-20 22:22 -0800
              Re: 'Lite' Databases (Re: sqlite3 and dates) Paul Rubin <no.email@nospam.invalid> - 2015-02-20 22:42 -0800
                Re: 'Lite' Databases (Re: sqlite3 and dates) Ned Deily <nad@acm.org> - 2015-02-21 00:17 -0800
                Re: 'Lite' Databases (Re: sqlite3 and dates) Paul Rubin <no.email@nospam.invalid> - 2015-02-21 00:32 -0800
            Re: 'Lite' Databases (Re: sqlite3 and dates) "Eric S. Johansson" <esj@harvee.org> - 2015-02-21 14:27 -0500
        Re: 'Lite' Databases (Re: sqlite3 and dates) memilanuk <memilanuk@gmail.com> - 2015-02-18 19:33 -0800
        Re: 'Lite' Databases (Re: sqlite3 and dates) Chris Angelico <rosuav@gmail.com> - 2015-02-19 15:01 +1100
        Re: 'Lite' Databases (Re: sqlite3 and dates) Ben Finney <ben+python@benfinney.id.au> - 2015-02-19 15:09 +1100
          Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-18 20:26 -0800
          Re: 'Lite' Databases (Re: sqlite3 and dates) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-19 18:23 +1100
        When to use SQLite3 [was Re: 'Lite' Databases (Re: sqlite3 and dates)] Ethan Furman <ethan@stoneleaf.us> - 2015-02-18 20:15 -0800
          Re: When to use SQLite3 [was Re: 'Lite' Databases (Re: sqlite3 and dates)] Steve Hayes <hayesstw@telkomsa.net> - 2015-02-19 06:59 +0200
            Re: When to use SQLite3 [was Re: 'Lite' Databases (Re: sqlite3 and dates)] Ethan Furman <ethan@stoneleaf.us> - 2015-02-18 21:07 -0800
        Re: 'Lite' Databases (Re: sqlite3 and dates) memilanuk <memilanuk@gmail.com> - 2015-02-18 20:29 -0800
        Re: 'Lite' Databases (Re: sqlite3 and dates) Ben Finney <ben+python@benfinney.id.au> - 2015-02-19 15:36 +1100
        Re: 'Lite' Databases (Re: sqlite3 and dates) memilanuk <memilanuk@gmail.com> - 2015-02-18 20:57 -0800
        Re: 'Lite' Databases (Re: sqlite3 and dates) Ben Finney <ben+python@benfinney.id.au> - 2015-02-19 16:16 +1100
        Re: 'Lite' Databases (Re: sqlite3 and dates) memilanuk <memilanuk@gmail.com> - 2015-02-18 21:26 -0800
        Re: 'Lite' Databases (Re: sqlite3 and dates) Ethan Furman <ethan@stoneleaf.us> - 2015-02-18 21:37 -0800
          Re: 'Lite' Databases (Re: sqlite3 and dates) rurpy@yahoo.com - 2015-02-19 13:17 -0800
      Re: sqlite3 and dates Steve Hayes <hayesstw@telkomsa.net> - 2015-02-19 04:48 +0200
        Re: sqlite3 and dates Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-19 03:34 +0000
    Re: sqlite3 and dates Ben Finney <ben+python@benfinney.id.au> - 2015-02-19 07:14 +1100
      Re: sqlite3 and dates rurpy@yahoo.com - 2015-02-18 14:13 -0800
        Re: sqlite3 and dates Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-19 10:07 +1100
          Re: sqlite3 and dates rurpy@yahoo.com - 2015-02-18 20:08 -0800

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