MyBatis Framework: SQL Mapping Guide

MyBatis is a persistence framework that operates in two main steps: mapping SQL statements and executing SQL statements.

1. SQL statement mapping: In MyBatis, developers need to write SQL mapping files (or use annotation methods) to map Java objects to data in the database. These mapping files define the mapping relationship between SQL statements and parameters, as well as the mapping relationship of result sets.
2. SQL statements execution: When developers call the corresponding method through MyBatis API, MyBatis will search for the corresponding SQL mapping file based on the configuration of the method, parse the SQL statement, pass the parameters to the SQL statement for execution. The execution result will be mapped to Java objects and returned to the developers.

In general, the working principle of MyBatis is to map SQL statements with Java objects, allowing for flexible and convenient access to databases in the persistence layer.