/**
* Drop removed types
* Add new types
* Apply type definition differences, updating the type's tables along the way
*
* @param $ofs output segementer
* @param $old_schema original schema
* @param $new_schema new schema
*/
public static function apply_changes($ofs, $old_schema, $new_schema)
{
// drop any types that are no longer defined
self::drop_types($ofs, $old_schema, $new_schema);
// create any types that are new in the new definition
self::create_types($ofs, $old_schema, $new_schema);
// there is no alter for types
// find types that still exist that are different
// placehold type data in table columns, and recreate the type
foreach (dbx::get_types($new_schema) as $new_type) {
// does type exist in old definition ?
if ($old_schema == NULL || !pgsql8_schema::contains_type($old_schema, $new_type['name'])) {
continue;
}
$old_type = dbx::get_type($old_schema, $new_type['name']);
// is there a difference between the old and new type definitions?
if (pgsql8_type::equals($old_schema, $old_type, $new_schema, $new_type)) {
continue;
}
pgsql8::set_context_replica_set_id($new_type);
$columns = array();
$is_domain = strcasecmp($new_type['type'], 'domain') === 0;
$n = $is_domain ? 3 : 4;
$word = $is_domain ? 'domain' : 'type';
$i = 1;
$old_dependent_functions = dbx::get_functions_with_dependent_type($old_schema, (string) $old_type['name']);
if (count($old_dependent_functions) > 0) {
$n += 2;
$ofs->write("-- {$word} {$new_type['name']} definition migration ({$i}/{$n}): dependent functions return/parameter type alteration\n");
$i++;
foreach ($old_dependent_functions as $old_dependent_function) {
$ofs->write(pgsql8_function::get_drop_sql($old_schema, $old_dependent_function) . "\n");
}
$ofs->write("\n");
}
$ofs->write("-- {$word} {$new_type['name']} definition migration ({$i}/{$n}): dependent tables column type alteration\n");
$i++;
$ofs->write(pgsql8_type::alter_column_type_placeholder($columns, $old_schema, $old_type) . "\n");
if ($is_domain) {
$ofs->write("-- {$word} {$new_type['name']} definition migration ({$i}/{$n}): alter domain\n");
$i++;
self::apply_domain_changes($ofs, $old_schema, $old_type, $new_schema, $new_type);
} else {
$ofs->write("-- {$word} {$new_type['name']} definition migration ({$i}/{$n}): drop old type\n");
$i++;
$ofs->write(pgsql8_type::get_drop_sql($old_schema, $old_type) . "\n\n");
$ofs->write("-- {$word} {$new_type['name']} definition migration ({$i}/{$n}): recreate type with new definition\n");
$i++;
$ofs->write(pgsql8_type::get_creation_sql($new_schema, $new_type) . "\n\n");
}
// functions are only recreated if they changed elsewise, so need to create them here
$new_dependent_functions = dbx::get_functions_with_dependent_type($new_schema, (string) $new_type['name']);
if (count($new_dependent_functions) > 0) {
$ofs->write("-- {$word} {$new_type['name']} definition migration ({$i}/{$n}): dependent functions return/parameter type with new definition\n");
$i++;
foreach ($new_dependent_functions as $new_dependent_function) {
$ofs->write(pgsql8_function::get_creation_sql($new_schema, $new_dependent_function) . "\n");
}
$ofs->write("\n\n");
}
$ofs->write("-- {$word} {$new_type['name']} definition migration ({$n}/{$n}): dependent tables type restoration\n");
$ofs->write(pgsql8_type::alter_column_type_restore($columns, $new_schema, $new_type) . "\n");
}
}
