dbforge->add_field([ 'id' => array('type' => 'INT','constraint' => 11,'unsigned' => TRUE,'auto_increment' => TRUE), 'user_id' => array('type' => 'INT', 'constraint' => 11, 'null' => TRUE), 'action' => array('type' => 'VARCHAR', 'constraint' => '50'), 'detail' => array('type' => 'TEXT', 'null' => TRUE), 'last_ip' => array('type' => 'VARCHAR', 'constraint' => '25'), 'user_agent' => array('type' => 'VARCHAR', 'constraint' => '100'), 'created_at' => array('type' => 'DATE', 'null' => TRUE), 'updated_at' => array('type' => 'DATETIME', 'null' => TRUE)]); $this->dbforge->add_key('id', TRUE); $this->dbforge->create_table('admin_operation'); } public function down() { $this->dbforge->drop_table('admin_operation'); } }