pet

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a query using a JOIN and ORDER BY and want to use it within my repository using the Criteria Api. Here I found, how to wrap such a query into a CriteriaQuery ( Link ). CriteriaQuery<Pet> cq = cb.createQuery(Pet.class); Root<Pet> pet = cq.from(Pet.class); Join<Pet, Owner> owner = cq.join(Pet_.owners); cq.select(pet); cq.orderBy(cb.asc(owner.get(Owner_.lastName),owner.get(Owner_.firstName))); On the other side, I found some examples to use the Criteria Api in Combination with a JpaRepository ( example ). The Problem is that all methods

type Pet interface { Name() string Category() string } type Dog struct { name string // 名字。 } func (dog *Dog) SetName(name string) { //注意这里定义的是指针方法 dog.name = name } func (dog Dog) Name() string { return dog.name } func (dog Dog) Category() string { return "dog" } dog := Dog{"little pig"} fmt.Printf("The dog's name is %q.\n", dog.Name()) var pet Pet = dog //这里赋值只是复制了一个副本而已 除非赋值指针 dog.SetName("monster") fmt.Printf("The dog's name is %q.\n", dog.Name()) fmt.Printf("This pet is a %s, the name is %q.\n", pet.Category(), pet.Name()) fmt.Println() 我们看下结果 The dog's name is "little pig". The dog's

一个类继承和调用的小代码： class PetShop: def __init__(self, name): self.name = name self.pets = set() # 动作 def save_pet(self, pet): # print(isinstance(pet, Pet)) if isinstance(pet, Pet): self.pets.add(pet) print('添加成功！') else: print('不是宠物不收留！') def sale_pet(self, pet): if isinstance(pet, Pet): self.pets.discard(pet) print('宠物减少') else: print('不是宠物不收留！') # 查找宠物 def search_pet(self, pname): for pet in self.pets: if pname == pet.pname: print('宠物在商店里') break else: print('不存在此宠物！') # 显示所有的宠物 def all_ pets(self): print('宠物商店所有的宠物信息如下:') for pet in self.pets: print(pet) class Pet: type = '宠物' def __init__(self,

1、类装饰器： 装饰器： 闭包 + 外层函数参数是函数对象 ---装饰器 装饰器函数其实是这样一个接口约束，它必须接受一个callable对象作为参数， 然后返回一个callable对象。在Python中一般callable对象都是函数，但也有例外。 只要某个对象重写了 __call__() 方法，那么这个对象就是callable的。 # 类装饰器 class decorate: def __init__(self,func): self.func = func def __call__(self, *args, **kwargs): self.func(*args, **kwargs) print('涂点粉') print('涂点口红...') print('变成小萝莉') @decorate def girl(): print('真是无耻.....') girl() 类装饰器 class decorate: def __init__(self, func): self.func = func def __call__(self, *args, **kwargs): class inner_class: def __init__(self, func): self.func = func def __call__(self, *args, **kwargs): self.func