mybatis-plus 分页操作

通过 username，email，address 等参数查询分页

    // 分页查询 - mybatis-plus的方式
    @GetMapping("/page")
    public IPage<User> findPage(@RequestParam Integer pageNum,
                                @RequestParam Integer pageSize,
                                @RequestParam(defaultValue = "") String username,
                                @RequestParam(defaultValue = "") String email,
                                @RequestParam(defaultValue = "") String address) {
        IPage<User> page = new Page<>(pageNum, pageSize);
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        if (!"".equals(username)) {
            queryWrapper.like("username", username);
        }
        if (!"".equals(email)) {
            queryWrapper.like("email", email);
        }
        if (!"".equals(address)) {
            queryWrapper.like("address", address);
        }
        queryWrapper.orderByDesc("id");
        return userService.page(page, queryWrapper);
    }