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[feature/new-tz-handling] Readd Database updater changes from Oleg

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The change here converts user_timezone to vchar and computes
timezone identifiers from the offsets. It uses database-specific
functions for building SQL conditionals and concatenations which
need to be implemented, probably in a separate ticket. As a result
the current code is not functional.

The changes are tricky since we need to drop user_dst column from
users table, but we need it during the data migration process to
properly calculate effective timezones for all users.

PHPBB3-9558
This commit is contained in:
Joas Schilling
2012-06-20 00:50:33 +02:00
parent a5628cbdc8
commit 902a79bfda
1 changed files with 27 additions and 0 deletions
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27
phpBB/install/database_update.php
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@ -2588,6 +2588,33 @@ function change_database_data(&$no_updates, $version)
$config->set('assets_version', '1');
}
// If the column exists, we did not yet update the users timezone
if ($db_tools->sql_column_exists(USERS_TABLE, 'user_dst'))
{
// Update timezones
// user_dst is 0 if not in dst and 1 if in dst;
// this happens to be exactly the correction that should be added to the timezone offset
// to obtain dst offset.
// Parenthesize here because we operate on this value later.
$active_offset = '(user_timezone + user_dst)';
// Now we have a tricky problem of forcing the plus sign into the expression.
// Build it via a conditional since there cannot be a portable printf equivalent in databases.
// Note that active offset is not an absolute value here - it is an expression that will
// be evaluated by the database during query execution.
// We don't print - (minus) here because it will come from active offset.
$sign = $db->sql_conditional("$active_offset < 0", '', '+');
// Use database-specific escaping because strings are quoted differently by different databases.
$new_value = $db->sql_concatenate($db->sql_escape('GMT'), $sign, $active_offset);
$sql = 'UPDATE ' . USERS_TABLE . '
SET user_timezone = ' . $new_value;
_sql($sql, $errored, $error_ary);
// After we have calculated the timezones we can delete user_dst column from user table.
$db_tools->sql_column_remove(USERS_TABLE, 'user_dst');
}
break;
}
}