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moved the pragma section before the foreign keys section

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Kenichi Ishigaki 2016-01-11 18:31:36 +09:00
parent 03dd9b486f
commit d38cfa00c1
1 changed files with 28 additions and 28 deletions
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56
lib/DBD/SQLite.pm
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@ -1241,34 +1241,6 @@ named) placeholders to avoid confusion.
); );
$sth->execute(1, 2); $sth->execute(1, 2);
=head2 Foreign Keys
SQLite has started supporting foreign key constraints since 3.6.19
(released on Oct 14, 2009; bundled in DBD::SQLite 1.26_05).
To be exact, SQLite has long been able to parse a schema with foreign
keys, but the constraints has not been enforced. Now you can issue
a C<foreign_keys> pragma to enable this feature and enforce the
constraints, preferably as soon as you connect to a database and
you're not in a transaction:
$dbh->do("PRAGMA foreign_keys = ON");
And you can explicitly disable the feature whenever you like by
turning the pragma off:
$dbh->do("PRAGMA foreign_keys = OFF");
As of this writing, this feature is disabled by default by the
SQLite team, and by us, to secure backward compatibility, as
this feature may break your applications, and actually broke
some for us. If you have used a schema with foreign key constraints
but haven't cared them much and supposed they're always ignored for
SQLite, be prepared, and please do extensive testing to ensure
that your applications will continue to work when the foreign keys
support is enabled by default.
See L<http://www.sqlite.org/foreignkeys.html> for details.
=head2 Pragma =head2 Pragma
SQLite has a set of "Pragma"s to modify its operation or to query SQLite has a set of "Pragma"s to modify its operation or to query
@ -1330,6 +1302,34 @@ in the worst case. See also L</"Performance"> section below.
See L<http://www.sqlite.org/pragma.html> for more details. See L<http://www.sqlite.org/pragma.html> for more details.
=head2 Foreign Keys
SQLite has started supporting foreign key constraints since 3.6.19
(released on Oct 14, 2009; bundled in DBD::SQLite 1.26_05).
To be exact, SQLite has long been able to parse a schema with foreign
keys, but the constraints has not been enforced. Now you can issue
a C<foreign_keys> pragma to enable this feature and enforce the
constraints, preferably as soon as you connect to a database and
you're not in a transaction:
$dbh->do("PRAGMA foreign_keys = ON");
And you can explicitly disable the feature whenever you like by
turning the pragma off:
$dbh->do("PRAGMA foreign_keys = OFF");
As of this writing, this feature is disabled by default by the
SQLite team, and by us, to secure backward compatibility, as
this feature may break your applications, and actually broke
some for us. If you have used a schema with foreign key constraints
but haven't cared them much and supposed they're always ignored for
SQLite, be prepared, and please do extensive testing to ensure
that your applications will continue to work when the foreign keys
support is enabled by default.
See L<http://www.sqlite.org/foreignkeys.html> for details.
=head2 Transactions =head2 Transactions
DBI/DBD::SQLite's transactions may be a bit confusing. They behave DBI/DBD::SQLite's transactions may be a bit confusing. They behave