@Caching&@ CacheConfig |学习笔记

开发者学堂课程【SpringBoot 快速掌握 - 高级应用：@Caching&@ CacheConfig】学习笔记，与课程紧密联系，让用户快速学习知识。

课程地址：https://developer.aliyun.com/learning/course/613/detail/9294

@Caching&@ CacheConfig

@Caching&amp 这个注解相当于是

@Cacheable@CachePut@CacheEvict 三个注解的组合@Target({ ElementType .METHOD, ElementType .TYPE})@Retention( RetentionPolicy .RUNTIME)

@Inherited

@ Documented

public@ interfaceCaching {

Cacheable[]cacheable() default{};

CachePut[]put() default{};

CacheEvict []evict() default{};

}

//@Caching 定义复杂的缓存规则

@Caching(

cacheable={

@Cacheable(value="emp",key="#lastNme")

},

put={

@CachePut(value="emp",key="#result,id"),

@CachePut(value="emp",key="#result:email")

}

)

public Employee get Emp By LastName(String lastName){  

return  emp1oyeeMapper . getEmpByLastName (lastName);

测试过程:

package com. atguigu. cache. mapper;

import...

@Mapper

public interface  EmployeeMapper {

@Select("SELECT* FROMemployeeWHEREid =#{id}")

public Employee  getEmpById (Integer id);

@Update(" UPDATEemployeeSETlastName =#(1astName),email=#(email),gender=#(gender),d_id=#(guǎi)#He  

public void updateEmp(Employee employee);

@Delete(" DELETEFROMemployeeWHEREid =#{id}")

public void delete EmpById(Integer id);

@Insert(" IMSERTINTOemployee (last/Bame,email,gender,d.id)VALUES(#(lastName),#(email),#(gender)#public  

void  insertEmployee (Employee employee);

@Select("SELECT* FROMemployeeWHERE1astName #(id}")

Employee  getEmpByLastName (String last Name);

}

又一次测试:

@ GetMapping ("/emp/lastname/{1astName}")

public Employee  getEmpByLastName (String lastName){

return  emp1oyeeService , getEmpByLastName (lastName);

按名字查，查到了"1号张三"，缓存注解就起作用了，不需要查数据库。但是查lastname 时还是要查数据库。

按照l astname 的 id 查就不需要查数据库。

@ CacheConfig ( cacheNames ="emp")//抽取缓存的公共配置

所有的缓存的公共配置都看这个。