使用mybatis plus框架，service继承了IService，SysOrder为订单实体类，SysOrderMapper为mybatis plus的Mapper接口，请写出controller层的增删改查功能

增加功能：

@RestController
@RequestMapping("/orders")
public class OrderController {

    @Autowired
    private SysOrderService sysOrderService;

    @PostMapping
    public boolean addOrder(@RequestBody SysOrder sysOrder) {
        return sysOrderService.save(sysOrder);
    }
}

删除功能：

@RestController
@RequestMapping("/orders")
public class OrderController {

    @Autowired
    private SysOrderService sysOrderService;

    @DeleteMapping("/{id}")
    public boolean deleteOrder(@PathVariable("id") Long id) {
        return sysOrderService.removeById(id);
    }
}

修改功能：

@RestController
@RequestMapping("/orders")
public class OrderController {

    @Autowired
    private SysOrderService sysOrderService;

    @PutMapping("/{id}")
    public boolean updateOrder(@PathVariable("id") Long id, @RequestBody SysOrder sysOrder) {
        sysOrder.setId(id);
        return sysOrderService.updateById(sysOrder);
    }
}

查询功能：

@RestController
@RequestMapping("/orders")
public class OrderController {

    @Autowired
    private SysOrderService sysOrderService;

    @GetMapping("/{id}")
    public SysOrder getOrder(@PathVariable("id") Long id) {
        return sysOrderService.getById(id);
    }

    @GetMapping
    public List<SysOrder> getOrderList() {
        return sysOrderService.list();
    }
}