What are the features and optimization methods of MyBat…

MyBatis is a persistence framework, and its features and optimization methods are as follows:

1. SQL control: MyBatis allows developers to directly write SQL statements, providing full control over the execution process with high flexibility.
2. Setting up MyBatis is easy: the configuration file is simple and can be configured using either XML or annotations.
3. Object-Relational Mapping: MyBatis supports mapping records from a database into Java objects, simplifying the data manipulation process.
4. Cache Mechanism: MyBatis has both first-level and second-level cache mechanisms, which can improve query performance.
5. Pluggable: MyBatis supports pluggable interceptors, allowing for custom operations to be carried out before and after SQL execution, such as logging and permission control.

Optimization methods:

1. Use caching wisely: Utilize MyBatis caching mechanism appropriately to improve query performance for frequently accessed data. However, be mindful of cache refresh issues to prevent data inconsistencies.
2. Batch operations: For batch data operations, you can utilize MyBatis batch operation functionality to reduce interactions with the database, thus improving performance.
3. SQL optimization involves writing efficient SQL statements to avoid inefficient operations such as full table scans and multiple queries. Utilizing mapping relationships, dynamic SQL, and other functionalities provided by MyBatis can help decrease unnecessary data operations.
4. Pagination: For queries with large amounts of data, you can use the pagination feature to reduce the amount of data in the returned results by setting appropriate pagination parameters.
5. Avoid excessive use of mapping: In mapping configuration, avoid excessive use of association queries and nested queries to reduce the database query pressure.
6. By using connection pools, MyBatis can work with connection pools to improve database connection reusability and performance.

In conclusion, by properly configuring and utilizing the features of MyBatis, the system’s performance and efficiency can be improved.