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mybatis first level cache and second level cache
In MyBatis, first-level cache and second-level cache are two different levels of caching mechanisms, both of which can be used to improve performance. This topic provides articles related to mybatis first-level cache and second-level cache, which you can read for free.
Detailed explanation of the use of mybatis first-level cache and second-level cacheMybatis first-level cache and second-level cache usage: 1. The first-level cache is the cache mechanism enabled by MyBatis by default. It will first check whether the same query result already exists in the first-level cache of the current thread. If it exists, the data in the cache will be returned directly. Instead of sending query requests to the database; 2. The second-level cache is a caching mechanism based on namespace. It will first check whether the same query result already exists in the current namespace second-level cache. If it exists, it will directly return the data in the cache without Then send the query request to the database.
What is the difference between mybatis first-level cache and second-level cache?The difference between the first-level cache and the second-level cache of mybatis: 1. The first-level cache of Mybatis refers to SQLSession. The scope of the first-level cache is SQlSession. Mabits enables the first-level cache by default; 2. Mybatis does not enable the second-level cache by default. Cached.
What are Java Mybatis first-level cache and second-level cache?1. What is cache? Cache is an area in memory that stores data. The purpose is to improve query efficiency. MyBatis will store the query results in the cache. When the same SQL is executed next time, the database will not be accessed, but the results will be obtained directly from the cache, thereby reducing the pressure on the server. What is cache? A piece of data that exists in memory. What does caching do? Reduce the interaction between the program and the database, improve query efficiency, and reduce the pressure on the server and database. What kind of data is cached? Data that is frequently queried but not frequently changed, and changes that have little impact on the results. What are the categories of MyBatis cache? How do the first-level cache and the second-level cache determine that two SQL statements are the same? The Sql statements of the query are the same and the passed parameter values are the same.
What are mybatis first-level cache and second-level cache?Mybatis first-level cache and second-level cache are two different levels of caching mechanisms provided by mybatis. The first-level cache is the cache mechanism enabled by default in mybatis. It is a thread-based local cache, and the second-level cache is based on the namespace level cache. Can be shared by multiple SqlSession objects.
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