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MyBatis缓存机制源码深度解析:一级缓存失效的5种场景你遇到过吗?

MyBatis缓存机制源码深度解析:一级缓存失效的5种场景你遇到过吗?
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MyBatis缓存机制源码深度解析:一级缓存失效的5种场景你遇到过吗?

说起MyBatis缓存,很多人只知道"一级缓存默认开启,二级缓存需要配置"。

但真正踩过坑的同学都知道:一级缓存莫名其妙失效,同一个查询重复执行两次;二级缓存配置后数据不一致,查出来的是脏数据。

这篇文章从源码层面拆解MyBatis缓存机制:一级缓存实现原理、二级缓存工作流程、缓存失效场景、与Redis整合方案


一、缓存架构总览

MyBatis缓存分为两级:

缓存级别
作用范围
默认状态
生命周期
一级缓存
SqlSession级别
默认开启
SqlSession关闭时清空
二级缓存
Mapper级别
需配置
应用级别,跨SqlSession共享
查询流程:
┌─────────────────────────────────────────────────┐
│                  Executor执行器                   │
│  ┌───────────────────────────────────────────┐  │
│  │              二级缓存(Mapper级别)          │  │
│  │  命中 → 直接返回                            │  │
│  │  未命中 → 查一级缓存                        │  │
│  └───────────────────────────────────────────┘  │
│  ┌───────────────────────────────────────────┐  │
│  │              一级缓存(SqlSession级别)      │  │
│  │  命中 → 直接返回                            │  │
│  │  未命中 → 查数据库 → 写入一级缓存            │  │
│  └───────────────────────────────────────────┘  │
└─────────────────────────────────────────────────┘

二、一级缓存源码解析

2.1 BaseExecutor核心实现

一级缓存的实现藏在BaseExecutor里:

publicabstractclassBaseExecutorimplementsExecutor{

protected PerpetualCache localCache;  // 一级缓存

@Override
public <E> List<E> query(MappedStatement ms, Object parameter, 
                              RowBounds rowBounds, ResultHandler resultHandler,
                              CacheKey key, BoundSql boundSql)
throws SQLException 
{

        List<E> list;

// 先查一级缓存
        list = resultHandler == null ? (List<E>) localCache.getObject(key) : null;

if (list != null) {
            handleLocallyCachedOutputParameters(ms, key, parameter, boundSql);
        } else {
// 缓存未命中,查数据库
            list = queryFromDatabase(ms, parameter, rowBounds, 
                                      resultHandler, key, boundSql);
        }

return list;
    }

private <E> List<E> queryFromDatabase(...)throws SQLException {

        List<E> list;

        localCache.putObject(key, EXECUTION_PLACEHOLDER);  // 占位符

try {
            list = doQuery(ms, parameter, rowBounds, resultHandler, boundSql);
        } finally {
            localCache.removeObject(key);  // 移除占位符
        }

        localCache.putObject(key, list);  // 写入缓存

return list;
    }

// 清空一级缓存
@Override
publicvoidclearCache(){
        localCache.clear();
    }
}

2.2 CacheKey如何生成

缓存Key决定查询能否命中:

public CacheKey createCacheKey(MappedStatement ms, Object parameterObject,
                                RowBounds rowBounds, BoundSql boundSql)
{

    CacheKey cacheKey = new CacheKey();

    cacheKey.update(ms.getId());                    // Statement ID
    cacheKey.update(rowBounds.getOffset());         // 分页offset
    cacheKey.update(rowBounds.getLimit());          // 分页limit
    cacheKey.update(boundSql.getSql());             // SQL语句

    List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
for (ParameterMapping parameterMapping : parameterMappings) {
        cacheKey.update(parameterObject);           // 参数值
    }

    cacheKey.update(boundSql.getAdditionalParameter()); // 额外参数

return cacheKey;
}

CacheKey组成

  • MappedStatement的ID(Mapper方法全限定名)
  • RowBounds的分页参数
  • SQL语句本身
  • 参数值
  • Environment的ID

任何一项不同,CacheKey就不同,缓存无法命中。

2.3 PerpetualCache底层存储

publicclassPerpetualCacheimplementsCache{

privatefinal String id;
privatefinal Map<Object, Object> cache = new HashMap<>();  // 简单HashMap

@Override
publicvoidputObject(Object key, Object value){
        cache.put(key, value);
    }

@Override
public Object getObject(Object key){
return cache.get(key);
    }

@Override
publicvoidclear(){
        cache.clear();
    }
}

一级缓存底层就是一个HashMap,存储在SqlSession内部。


三、一级缓存失效的5种场景

场景1:SqlSession关闭或commit

SqlSession session1 = sqlSessionFactory.openSession();
User user1 = session1.selectOne("com.example.mapper.UserMapper.selectById"1);

session1.commit();  // 清空一级缓存

SqlSession session2 = sqlSessionFactory.openSession();
User user2 = session2.selectOne("com.example.mapper.UserMapper.selectById"1);
// 再次查询数据库,未命中缓存

源码

@Override
publicvoidcommit(boolean force){
    clearCache();  // commit时清空缓存
    transaction.commit(force);
}

场景2:执行了insert/update/delete

SqlSession session = sqlSessionFactory.openSession();
User user1 = session.selectOne("selectById"1);  // 写入缓存

session.update("updateUser", user1);  // 执行更新

User user2 = session.selectOne("selectById"1);  // 缓存失效,重新查询

源码

@Override
publicintupdate(MappedStatement ms, Object parameter)throws SQLException {
    clearCache();  // 执行更新操作前清空缓存
return doUpdate(ms, parameter);
}

场景3:查询条件不同

User user1 = session.selectOne("selectById"1);
User user2 = session.selectOne("selectById"2);  // CacheKey不同,缓存不命中

// 或者
User user3 = session.selectOne("selectByName""张三");  // Statement ID不同

场景4:手动清空缓存

User user1 = session.selectOne("selectById"1);

session.clearCache();  // 手动清空

User user2 = session.selectOne("selectById"1);  // 重新查询

场景5:RowBounds分页参数不同

List<User> list1 = session.selectList("selectAll"null
new RowBounds(010));

List<User> list2 = session.selectList("selectAll"null
new RowBounds(1010));  // offset不同,缓存不命中

四、二级缓存源码解析

4.1 CachingExecutor装饰器模式

二级缓存用装饰器模式包装Executor:

publicclassCachingExecutorimplementsExecutor{

privatefinal Executor delegate;  // 被装饰的Executor(BaseExecutor)
private TransactionalCacheManager tcm;  // 缓存管理器

@Override
public <E> List<E> query(MappedStatement ms, Object parameter,
                              RowBounds rowBounds, ResultHandler resultHandler,
                              CacheKey key, BoundSql boundSql)
throws SQLException 
{

        Cache cache = ms.getCache();  // 获取二级缓存

if (cache != null) {
            flushCacheIfRequired(ms);  // 检查是否需要清空

if (ms.isUseCache() && resultHandler == null) {
                ensureNoOutParams(ms, boundSql);

                List<E> list = (List<E>) tcm.getObject(cache, key);

if (list == null) {
// 二级缓存未命中,委托给BaseExecutor查一级缓存和数据库
                    list = delegate.query(ms, parameter, rowBounds, 
                                          resultHandler, key, boundSql);

                    tcm.putObject(cache, key, list);  // 写入二级缓存
                }

return list;
            }
        }

return delegate.query(ms, parameter, rowBounds, resultHandler, key, boundSql);
    }
}

4.2 TransactionalCache事务缓存

二级缓存不是直接写入,而是通过TransactionalCache包装:

publicclassTransactionalCacheimplementsCache{

privatefinal Cache delegate;  // 真实的缓存
privatefinal Map<Object, Object> entriesToAddOnCommit;  // 待提交的缓存
privatefinal Set<Object> entriesMissedInCache;  // 未命中的Key

@Override
publicvoidputObject(Object key, Object value){
        entriesToAddOnCommit.put(key, value);  // 先存到待提交区
    }

@Override
publicvoidcommit(){
// commit时才真正写入缓存
for (Map.Entry<Object, Object> entry : entriesToAddOnCommit.entrySet()) {
            delegate.putObject(entry.getKey(), entry.getValue());
        }
        entriesToAddOnCommit.clear();
    }

@Override
publicvoidrollback(){
// rollback时不写入,清空待提交区
        entriesToAddOnCommit.clear();
    }
}

关键设计:二级缓存的事务性保证:

  • 查询结果先存到entriesToAddOnCommit
  • 只有commit()时才真正写入缓存
  • rollback()时丢弃待提交数据

4.3 二级缓存配置

<!-- Mapper.xml -->
<mappernamespace="com.example.mapper.UserMapper">

<cacheeviction="LRU"flushInterval="60000"size="1024"readOnly="true"/>

<!-- 或引用其他Mapper的缓存 -->
<cache-refnamespace="com.example.mapper.OtherMapper"/>

</mapper>

cache配置参数

  • eviction:淘汰策略(LRU/FIFO/SOFT/WEAK)
  • flushInterval:自动清空间隔(毫秒)
  • size:缓存容量
  • readOnly:是否只读(只读返回同一对象,可读返回克隆对象)

Java注解方式

@CacheNamespace(implementation = LruCache.classsize1024)
publicinterfaceUserMapper{

@CacheNamespaceRef(UserMapper.class)
List<UserselectAll()
;
}

五、二级缓存踩坑案例

坑1:多表关联查询缓存不一致

// UserMapper.xml
<select id="selectUserWithOrder" resultType="User">
    SELECT u.*, o.order_no FROM user u 
    LEFT JOIN order o ON u.id = o.user_id 
    WHERE u.id = #{id}
</select>

// OrderMapper.xml  
<update id="updateOrder">
    UPDATE order SET order_no = #{orderNo} WHERE id = #{id}
</update>

问题

  • selectUserWithOrder缓存到UserMapper
  • updateOrder清空OrderMapper缓存
  • UserMapper缓存未清空,查到旧数据

解决:使用cache-ref

<!-- OrderMapper.xml -->
<cache-refnamespace="com.example.mapper.UserMapper"/>

或者:多表关联查询不要使用二级缓存

坑2:分布式环境下缓存不一致

// 应用实例A查询并缓存
User user = userMapper.selectById(1);  // 写入二级缓存

// 应用实例B更新
userMapper.updateById(user);  // 只清空实例B的缓存

// 应用实例A再次查询
User user2 = userMapper.selectById(1);  // 命中脏缓存!

解决:分布式环境下禁用MyBatis二级缓存,使用Redis。


六、与Redis整合方案

6.1 自定义RedisCache

publicclassRedisCacheimplementsCache{

privatefinal String id;
privatefinal RedisTemplate<String, Object> redisTemplate;

publicRedisCache(String id){
this.id = id;
this.redisTemplate = SpringContextHolder.getBean("redisTemplate");
    }

@Override
publicvoidputObject(Object key, Object value){
        String cacheKey = generateKey(key);
        redisTemplate.opsForValue().set(cacheKey, value, Duration.ofMinutes(30));
    }

@Override
public Object getObject(Object key){
        String cacheKey = generateKey(key);
return redisTemplate.opsForValue().get(cacheKey);
    }

@Override
public Object removeObject(Object key){
        String cacheKey = generateKey(key);
        redisTemplate.delete(cacheKey);
returnnull;
    }

@Override
publicvoidclear(){
        String pattern = id + ":*";
        Set<String> keys = redisTemplate.keys(pattern);
if (keys != null && !keys.isEmpty()) {
            redisTemplate.delete(keys);
        }
    }

private String generateKey(Object key){
return id + ":" + key.hashCode();
    }
}

6.2 配置使用Redis缓存

<mappernamespace="com.example.mapper.UserMapper">
<cachetype="com.example.cache.RedisCache"/>
</mapper>

6.3 缓存Key优化

private String generateKey(Object key){
    CacheKey cacheKey = (CacheKey) key;
    StringBuilder sb = new StringBuilder();
    sb.append(id).append(":");

for (Object update : cacheKey.getUpdateList()) {
        sb.append(update.toString()).append(":");
    }

return sb.toString();
}

七、最佳实践

7.1 一级缓存使用建议

场景
建议
单表简单查询
默认开启,无需干预
同一SqlSession多次查询
利用一级缓存减少数据库访问
批量操作后查询
注意缓存已清空
多线程环境
不要共享SqlSession

7.2 二级缓存使用建议

场景
建议
单表查询、更新少
可以启用
多表关联查询
禁用二级缓存
分布式部署
禁用,使用Redis
高并发读
配合Redis

7.3 缓存配置最佳实践

mybatis:
configuration:
cache-enabled:true# 全局开启二级缓存(默认true)
local-cache-scope:statement# 一级缓存范围(session/statement)

local-cache-scope

  • session:默认,整个SqlSession共享
  • statement:每次查询后清空,相当于禁用一级缓存

八、面试加分Q&A

Q1:一级缓存和二级缓存的区别?

A:

  • 作用范围:一级缓存SqlSession级别,二级缓存Mapper级别
  • 默认状态:一级缓存默认开启,二级缓存需配置
  • 生命周期:一级缓存随SqlSession关闭,二级缓存应用级别
  • 数据一致性:一级缓存单会话隔离,二级缓存跨会话共享需注意

Q2:为什么执行update操作后一级缓存失效?

A: 源码中BaseExecutor.update()方法会先调用clearCache()清空缓存。目的是保证数据一致性,避免查询到旧数据。

Q3:二级缓存为什么需要commit才生效?

A: 二级缓存通过TransactionalCache包装,查询结果先存到entriesToAddOnCommit待提交区。只有事务commit时才真正写入缓存,rollback时丢弃。这样保证缓存数据与数据库事务一致性。

Q4:多表关联查询能用二级缓存吗?

A: 不建议。因为一个Mapper的更新操作不会清空关联Mapper的缓存,导致数据不一致。解决方案:

  • 使用cache-ref引用同一缓存
  • 或禁用二级缓存,改用Redis

Q5:分布式环境如何处理MyBatis缓存?

A: 禁用MyBatis二级缓存,自定义RedisCache实现:

  • 继承Cache接口
  • 用Redis存储缓存数据
  • 所有实例共享Redis,保证一致性

九、总结

MyBatis缓存机制核心设计:

机制
实现类
关键点
一级缓存
PerpetualCache + BaseExecutor
HashMap存储,update/commit清空
二级缓存
CachingExecutor + TransactionalCache
装饰器模式,事务性保证
缓存Key
CacheKey
Statement ID + SQL + 参数

记住三条铁律

  1. 一级缓存默认开启,但update/commit/关闭SqlSession会失效
  2. 二级缓存跨SqlSession共享,多表关联和分布式环境慎用
  3. 分布式环境用Redis替代二级缓存,保证数据一致性

源码层面,理解BaseExecutor.localCacheTransactionalCache.entriesToAddOnCommit两个关键存储,就理解了MyBatis缓存的核心机制。


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  1. CONNECT:[ UseTime:0.000623s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000869s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000358s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000267s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000502s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000534s ]
  8. SELECT * FROM `article` WHERE `id` = 628012 LIMIT 1 [ RunTime:0.004613s ]
  9. UPDATE `article` SET `lasttime` = 1778801128 WHERE `id` = 628012 [ RunTime:0.006587s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000313s ]
  11. SELECT * FROM `article` WHERE `id` < 628012 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000511s ]
  12. SELECT * FROM `article` WHERE `id` > 628012 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000355s ]
  13. SELECT * FROM `article` WHERE `id` < 628012 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002990s ]
  14. SELECT * FROM `article` WHERE `id` < 628012 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006009s ]
  15. SELECT * FROM `article` WHERE `id` < 628012 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005726s ]
0.131821s