What are the functions of mybatis first-level cache?

The functions of mybatis first-level cache: 1. Reduce the number of database accesses; 2. Improve data access efficiency; 3. Automatically manage the cache life cycle; 4. Support simple data sharing; 5. Provide faster development Iteration; 6. Simplify the code structure. Detailed introduction: 1. Reduce the number of database accesses. When performing a query operation, MyBatis will first check whether the data exists in the first-level cache. If it exists, it will directly return the cached data, avoiding repeated queries to the database and improving performance. Data access efficiency; 2. Improve data access efficiency, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

MyBatis's first-level cache is based on SqlSession. Its main function is to reduce the number of database accesses and improve data access efficiency. The following are the detailed functions of MyBatis's first-level cache:

1. Reduce the number of database accesses:When performing a query operation, MyBatis will first check whether the data exists in the first-level cache. If it exists, the cached data is returned directly, which avoids repeated queries to the database and improves data access efficiency. The existence of the first-level cache reduces unnecessary database access operations and reduces the burden on the database.

2. Improve data access efficiency:Due to the existence of the first-level cache, MyBatis can quickly obtain data from the cache without querying the database every time. For the same data that is accessed frequently, the first-level cache can provide almost real-time data access speed, greatly improving the performance and response speed of the application.

3. Automatically manage cache life cycle:MyBatis's first-level cache is automatically managed and does not require developers to manually clean or manage it. When the SqlSession closes or commits the transaction, its cache will be cleared to ensure the real-time and consistency of the data. This automated cache management method simplifies developers' operations and reduces errors caused by manual cache management.

4. Support simple data sharing:Although the first-level cache is SqlSession level, it can also achieve data sharing to a certain extent in some cases. If multiple SqlSession share the same first-level cache data, they can obtain the same data results, reducing the need to repeatedly query the database. However, this data sharing capability is relatively limited and is not suitable for large-scale or complex distributed systems.

5. Provide faster development iterations:Due to the existence of the first-level cache, developers can obtain data results faster during the testing and debugging phases, speeding up the development iteration process. . During the development process, there is no need to wait for the execution of database queries every time, which improves development efficiency.

6. Simplify the code structure:The existence of the first-level cache allows developers to focus more on the implementation of SQL statements and business logic without paying too much attention to the details of data access. Through MyBatis' simplified mapping mechanism, developers can separate SQL statements from Java code, making the code structure clearer and easier to maintain.

However, while level one caching provides many conveniences and performance benefits, there are also limitations and potential issues that need to be noted. For example, the first-level cache is based on SqlSession, so its life cycle is relatively short. The cache is cleared when the SqlSession is closed or the transaction is committed. In addition, the first-level cache is automatically managed, and developers cannot manually intervene or manage its life cycle.

To sum up, the main function of MyBatis's first-level cache is to reduce the number of database accesses and improve data access efficiency. It simplifies developers' operations through automated cache management mechanisms and provides faster development iterations. However, when using the first-level cache, you still need to pay attention to the limitations of its life cycle and applicable scenarios. Reasonable utilization of the first-level cache when using MyBatis can effectively improve the performance and response speed of the application.

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