关于更新缓存 ，要注意两点
1、@Cacheable的key
要和@CachePut 的key一致
比如：
@Cacheable(key = "'userCache'") //缓存,
public Uuser findByEmail(String email) {
System.err.println("执行这里，说明缓存中读取不到数据，直接读取数据库....");
return redisMapper.findByEmail(email);
}
@CachePut(key = "'userCache'") //userCache要加‘'单引号，表示这是一个字符串
public Uuser updateSelf(String nickname, String email) {
System.err.println("执行这里，更新数据库，更新缓存....");
uuserMapper.updateSelf(nickname, email);
Uuser uuser = redisMapper.findByEmail(email);
return uuser;
}
2、@CachePut的返回值
要和@Cacheable的返回值一样
如果@Cacheable 返回的是一个对象，@CachePut 返回也要是对象，否则会报类型转换异常，如上代码 返回的都是 Uuser.
缓存的CachePut冲突Cacheable
CachePut 跟 Cacheable放在一起， Cacheable的效果就跟 CachePut 一样的，每次都会去查数据库，虽然有缓存。
@Caching( put = {
@CachePut(key = "T(cn.a.b.constant.RedisKey).OPEN_MEDIUM_INFO + #result.mediumBankCard", unless="#result.mediumBankCard==null or #result.status !='2'"),
@CachePut(key = "T(a.b.c.constant.RedisKey).ACCOUNT_CODE + #result.accountCode", unless="!{'0','1','2','3'}.contains(#result.mediumStatus)"),
@CachePut(key = "T(a.b.c.constant.RedisKey).CERT_NO+ #result.certNo", unless="#result.certNo==null or !{'0','1','2','3'}.contains(#result.status)")
}
, cacheable = {@Cacheable(key="T(a.b.c.constant.RedisKey).ID + #id")}
)
public XXXInfo selectByPrimaryKey(Long id){
return mapper.selectByPrimaryKey(id);
}可以分解成两个
Service.java
@Caching( put = {
@CachePut(key = "T(cn.a.b.constant.RedisKey).OPEN_MEDIUM_INFO + #result.mediumBankCard", unless="#result.mediumBankCard==null or #result.status !='2'"),
@CachePut(key = "T(a.b.c.constant.RedisKey).ACCOUNT_CODE + #result.accountCode", unless="!{'0','1','2','3'}.contains(#result.mediumStatus)"),
@CachePut(key = "T(a.b.c.constant.RedisKey).CERT_NO+ #result.certNo", unless="#result.certNo==null or !{'0','1','2','3'}.contains(#result.status)")
}
)
public XXXInfo selectByPrimaryKey(Long id){
return mapper.selectByPrimaryKey(id);
}
Mapper.java
{
@Cacheable(key="T(a.b.c.constant.RedisKey).ID + #p0")
XXXXInfo selectByPrimaryKey(Long id);
}
mybatis 接口类参数。用#参数名无效。 只能用#p0, #p1
以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
