Example Analysis of caching in Mybatis

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The primary and secondary caches of Mybatis.

1) first-level cache: PerpetualCache-based HashMap local cache, whose storage scope is Session. After Session flush or close, all Cache in the Session will be cleared, and first-level cache will be turned on by default.

2) the mechanism of the second-level cache is the same as that of the first-level cache, except that the storage scope is Mapper (Namespace) and the storage source can be customized, such as Ehcache. The second-level cache is not enabled by default. To enable the second-level cache, you need to implement the Serializable serialization interface (which can be used to save the state of the object) to use the secondary cache property class, which can be configured in its mapping file.

3) for the cache data update mechanism, when the C/U/D operation is performed in a certain scope (first-level cache Session/-second-level cache Namespaces), by default all caches in the select under that scope will be clear.

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