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tomhukins (4457)

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Perl, Web, Database developer, and Milton Keynes Perl Monger [].

Journal of tomhukins (4457)

Tuesday October 31, 2006
07:36 AM

In-memory SQLite Databases

[ #31457 ]

Like many people, I use DBD::SQLite in my unit tests so I don't need to rely on a live database.

I've been using File::Temp::tempfile() to create temporary files for me use as SQLite database files. Yesterday, I noticed that tempfile() and DBD::SQLite don't play nicely together. I could use tmpnam(), but as this doesn't create the temporary file a small race condition exists.

I discussed this with Matts last night and he pointed me towards SQLite's in-memory databases. My test cases don't use huge amounts of data, so I can run everything in memory and avoid hitting the disk:

DBI->connect('dbi:SQLite:dbname=:memory:', '', '');

This means I don't need to bother with temporary files any more, making my tests simpler and faster.

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  • I have no idea about that one either. All of my tests have been using these to help with the IO:

            'PRAGMA synchronous = OFF',
            'PRAGMA temp_store = MEMORY'

    Most dists, like Handel and DBIC have rolled their own schema/var/temp.db creation/cleanup routines for the tests suites. It would't suck if this could replace all that mess; or at least the file parts.