【缓存】@Caching和@CacheConfig

@Caching

功能：定义复杂的缓存规则
示例：
在【缓存】@CachePut的基础上进行修改：
EmployeeService类中添加方法：

    @Caching(
            cacheable = {
                    @Cacheable(value = "emp",key = "#lastName")
            },
            put = {
                    @CachePut(value = "emp",key = "#result.id"),
                    @CachePut(value = "emp",key = "#result.email")
            }
    )
    public Employee getEmpByLastName(String lastName) {
        Employee emp = employeeMapper.getEmpByLastName(lastName);
        return emp;
    }

EmployeeController中添加方法：

    @GetMapping("/emp/lastname/{lastName}")
    public Employee getEmpByLastName(@PathVariable("lastName") String lastName) {
        Employee emp = employeeService.getEmpByLastName(lastName);
        return emp;
    }

@CacheConfig

功能： 抽取缓存的公共配置。
EmployeeService类：

package com.qublog.cache.service;

import com.qublog.cache.bean.Employee;
import com.qublog.cache.mapper.EmployeeMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.*;
import org.springframework.stereotype.Service;


@CacheConfig(cacheNames = "emp")
@Service
public class EmployeeService {

    @Autowired
    EmployeeMapper employeeMapper;

    //将方法的运行结果进行缓存，以后再要相同数据，直接从缓存中获取，不用调用方法
    @Cacheable(/*cacheNames = {"emp"}*/)
    public Employee getEmp(Integer id){
        System.out.println("查询"+id+"号员工");
        Employee emp = employeeMapper.getEmpById(id);
        return emp;
    }

    //key也可以使用#result.id
    @CachePut(/*value = "emp",*/key = "#employee.id")
    public Employee updateEmp(Employee employee) {
        employeeMapper.updateEmp(employee);
        System.out.println("更新"+employee);
        return employee;
    }

    //用key来指定要清除的数据
    //allEntries = true
    @CacheEvict(/*value = "emp",*/key = "#id")
    public void deleteEmp(Integer id) {
        System.out.println("删除"+id);
        //employeeMapper.deleteEmp(id);
//        int i=1/0;
    }

    @Caching(
            cacheable = {
                    @Cacheable(/*value = "emp",*/key = "#lastName")
            },
            put = {
                    @CachePut(/*value = "emp",*/key = "#result.id"),
                    @CachePut(/*value = "emp",*/key = "#result.email")
            }
    )
    public Employee getEmpByLastName(String lastName) {
        Employee emp = employeeMapper.getEmpByLastName(lastName);
        return emp;
    }

}