What is the principle of execution in MyBatis?

The execution principle of MyBatis can be divided into the following steps:

1. Parsing configuration file: MyBatis will first parse the configuration file, including configuration information such as data source, transaction management, and mapping files.
2. Creating SqlSessionFactory: MyBatis will build a SqlSessionFactory object based on the information in the configuration file. SqlSessionFactory is the core object of MyBatis and is used to create SqlSession.
3. Create SqlSession: Use SqlSessionFactory to create a SqlSession object. SqlSession is a session object that interacts with the database, it can execute SQL statements, retrieve mappers, manage transactions, and so on.
4. Analyze mapping file: Based on the information in the mapping file, MyBatis will parse SQL statements, parameter mapping, result mapping, and other information.
5. The SQL statement is executed by MyBatis using JDBC based on the parsed SQL statement and parameters, and the results are encapsulated as Java objects.
6. Response: MyBatis returns the results to the caller.

In summary, the execution principle of MyBatis involves parsing configuration and mapping files to create SqlSessionFactory and SqlSession, then executing SQL statements and returning results. Additionally, MyBatis also offers a series of plugin mechanisms to intercept and enhance the execution process.