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DBD::SQLite: added short explanation of SQLite's pragma

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Kenichi Ishigaki 2009-10-21 02:03:53 +00:00
parent 9a3151e321
commit 52b7337ed8
1 changed files with 7 additions and 4 deletions
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11
lib/DBD/SQLite.pm
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@ -737,10 +737,13 @@ This is somewhat weird, but works anyway.
Since SQLite 3.6.19 (released on Oct 14, 2009; bundled with
DBD::SQLite 1.26_05), foreign key constraints are supported (though
with some limitations). See L<http://www.sqlite.org/foreignkeys.html>
for details. Note that this feature is not enabled by default. You
need to issue a pragma explicitly, or set C<sqlite_foreign_keys>
attribute to the database handle (explicitly, or as a connection
attribute. See below).
for details. Though SQLite does NOT enable this feature by default yet (for backward compatibility), DBD::SQLite enables it internally. If you don't want this feature, issue a pragma to disable the feature.
$dbh->do("PRAGMA foreign_keys = OFF");
=head2 Pragma
SQLite has a set of "Pragma"s to modifiy its operation or to query for its internal data. These are specific to SQLite and are not likely to work with other DBD libraries, but you may find some of these are quite useful. DBD::SQLite actually sets some (like C<foreign_keys> above) for you when you connect to a database. See L<http://www.sqlite.org/pragma.html> for details.
=head2 Performance