How to use @ CachePut to update the database and cache
Editor to share with you how to use @ CachePut to update the database and update cache, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!
About updating the cache, pay attention to two points: 1, @ Cacheable's key
To be consistent with @ CachePut's key
For example:
@ Cacheable (key = "'userCache'") / / cache, public Uuser findByEmail (String email) {System.err.println ("execute here, indicating that the data cannot be read in the cache, read the database directly."); return redisMapper.findByEmail (email) } @ CachePut (key = "'userCache'") / / userCache is to be enclosed in' 'single quotes, indicating that this is a string public Uuser updateSelf (String nickname, String email) {System.err.println ("execute here, update the database, update the cache."); uuserMapper.updateSelf (nickname, email); Uuser uuser = redisMapper.findByEmail (email); return values of return uuser;} 2 and @ CachePut
To be the same as the return value of @ Cacheable
If @ Cacheable returns an object, @ CachePut returns an object, otherwise it will report a type conversion exception, such as Uuser.
Cached CachePut conflict Cacheable
When CachePut and Cacheable are put together, Cacheable has the same effect as CachePut, checking the database every time, even though there is a cache.
/ * * @ param id * @ return * / @ 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= "! '3'} .coach (# result.mediumStatus)), @ CachePut (key= "T (a.b.c.constant.RedisKey). CERT_NO+ # result.certNo", unless= "# result.certNo==null or! {' 0# result.status))}, cacheable = {@ Cacheable (key=" T (a.b.c.constant.RedisKey). ID + # id ") public XXXInfo selectByPrimaryKey (Long id) {return mapper.selectByPrimaryKey (id) } can be decomposed into two Service.java/** @ param id * @ return * / @ 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' (# result.mediumStatus), @ CachePut (key = "T (a.b.c.constant.RedisKey). CERT_NO+ # result.certNo", unless= "# result.certNo==null or! {# 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 interface class parameters. Invalid # parameter name. Can only use # p0, # p1
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