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网站做多大的宽高,进入电商平台832采购,网站小图标怎么做的,找设计方案的网站MyBatis基本工作原理MyBatis是一个半自动化的ORM框架#xff0c;通过简化JDBC操作和SQL管理#xff0c;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#xff1a;配置加载与初始化MyBatis启动时加载全局配置文件#xff08;如mybatis-config.xml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 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