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<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Migration_add_constraints extends CI_Migration {
public function up()
{
if ($this->db->dbdriver == 'postgre') {
$this->db->query('ALTER TABLE "users" ALTER COLUMN "referrer" TYPE integer');
$this->db->query('ALTER TABLE "users" ALTER COLUMN "referrer" DROP NOT NULL');
$this->db->query('CREATE INDEX "users_referrer_idx" ON "users" ("referrer")');
$this->db->query('UPDATE "users" SET "referrer" = NULL where "referrer" = 0');
$this->db->query('
ALTER TABLE "users"
ADD CONSTRAINT "referrer_user_fkey" FOREIGN KEY ("referrer")
REFERENCES "users"("id") ON DELETE RESTRICT ON UPDATE RESTRICT
');
} else {
$this->db->query("ALTER TABLE `users` ADD INDEX(`referrer`);");
$this->db->query("ALTER TABLE `users` CHANGE `referrer` `referrer`
INT(8) UNSIGNED NULL;");
$this->db->query("UPDATE `users` SET `referrer` = NULL where `referrer` = 0;");
$this->db->query("ALTER TABLE `users` ADD FOREIGN KEY (`referrer`)
REFERENCES `users`(`id`) ON DELETE RESTRICT ON UPDATE RESTRICT;");
}
}
public function down()
{
show_error("downgrade not supported");
}
}
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