MyBatis基本工作原理
MyBatis是一个半自动化的ORM框架，通过简化JDBC操作和SQL管理，实现Java对象与数据库表之间的映射。其核心工作原理可分为以下几个部分：
配置加载与初始化
MyBatis启动时加载全局配置文件（如mybatis-config.xml），解析数据源、事务管理器、类型处理器等基础配置。同时加载Mapper XML文件或扫描Mapper接口，建立SQL语句与方法的映射关系。
SQL会话管理
通过SqlSessionFactory创建SqlSession，每个会话代表一次数据库交互。SqlSession封装了JDBC操作，提供查询、插入、更新、删除等方法，并管理事务的生命周期。
SQL解析与执行
Mapper接口的方法调用时，MyBatis根据方法名或注解定位对应的SQL语句（XML或注解定义）。动态SQL标签（如<if>、<foreach>）在运行时生成最终SQL，参数通过预编译（PreparedStatement）防止SQL注入。
结果映射
查询结果通过ResultMap或类型别名自动转换为Java对象。MyBatis支持嵌套对象、集合等复杂映射，通过反射或类型处理器（TypeHandler）完成字段与属性的赋值。
缓存机制
一级缓存默认开启，作用于SqlSession级别，相同查询直接返回缓存结果。二级缓存需手动配置，跨会话共享数据，通过序列化/反序列化实现。
扩展点与插件
拦截器（Interceptor）可对SQL执行过程进行拦截，实现分页、性能监控等功能。自定义类型处理器支持特殊数据类型（如JSON、枚举）的转换。
示例代码片段展示核心流程：
// 初始化 String resource = "mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); // 执行查询 try (SqlSession session = sqlSessionFactory.openSession()) { UserMapper mapper = session.getMapper(UserMapper.class); User user = mapper.selectById(1); // 触发SQL解析与结果映射 }https://avg.163.com/topic/detail/8049958
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https://avg.163.com/topic/detail/8050345
https://avg.163.com/topic/detail/8050372
https://avg.163.com/topic/detail/8050284
https://avg.163.com/topic/detail/8050542
https://avg.163.com/topic/detail/8050563
https://avg.163.com/topic/detail/8050582
https://avg.163.com/topic/detail/8050599
https://avg.163.com/topic/detail/8050547
https://avg.163.com/topic/detail/8050561
https://avg.163.com/topic/detail/8050581
https://avg.163.com/topic/detail/8050600
https://avg.163.com/topic/detail/8050282
https://avg.163.com/topic/detail/8050540
