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Mybatis的SqlSession和SqlSessionFactory
SqlSession：
处理mybatis增删改查及事物的接口，select ， update ， delete ， insert ， commit ， rollback ，
close ， flushStatements等
SqlSessionFactory：工厂设计模式，创建SqlSession的工厂。
SqlSessionFactory是MyBatis的关键对象,单个数据库映射关系经过编译后的内存镜像。
SqlSessionFactory对象的实例可以通过SqlSessionFactoryBuilder对象类获得,
而SqlSessionFactoryBuilder则可以从XML配置文件或一个预先定制的Configuration的实例构建出SqlSessionFactory的实例.
(1)、定义一个Configuration对象，其中包含数据源、事务、mapper文件资源以及影响数据库行为属性设置settings，即(配置文件，实体类，xml中写好的sql语句)
public void selectByid() throws IOException { //以查询一条记录为例
//加载sqlMapConfig.xml文件 InputStream inputStream =
Resources.getResourceAsStream("mybatis/SqlMapConfig.xml");
(2)、通过配置对象，则可以创建一个SqlSessionFactoryBuilder对象
SqlSessionFactoryBuilder sqlSessionFactoryBuilder=new
SqlSessionFactoryBuilder();
(3)、通过 SqlSessionFactoryBuilder 获得SqlSessionFactory 的实例。
SqlSessionFactory
sqlSessionFactory=sqlSessionFactoryBuilder.build(inputStream);
(4)、SqlSessionFactory 的实例可以获得操作数据的SqlSession实例，通过这个实例对数据库进行
SqlSession sqlSession=sqlSessionFactory.openSession();
（5）创建mapper接口的实例
EmpMapper mapper = sqlSession.getMapper(EmpMapper.class); //使用接口 Emp emp
=mapper.selectById(1001); System.out.println("emp=="+emp); }
