自定义持久层框架

自定义持久层框架

SqlSessionFactory

DefaultSqlSessionFactory

Configuration

SqlSession

DefaultSqlSession

Executor

SimpleExecutor

自定义持久层框架实现功能的流程

InputStream resourceAsStream = Resources.getResourceAsStream(\"sqlMapConfig.xml\");

InputStream resourceAsStream = Resources.class.getClassLoader().getResourceAsStream(path);

SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);

// 第一： 使用dom4j解析配置文件， 将解析出来的内容封装到Configuration中 XMLConfigBuilder xmlConfigBuilder = new XMLConfigBuilder(); Configuration configuration = xmlConfigBuilder.parseConfig(in);

// 第二： 创建sqlSessionFactory对象 DefaultSqlSessionFactory defaultSqlSessionFactory = new DefaultSqlSessionFactory(configuration);

SqlSession sqlSession = sqlSessionFactory.openSession();

return new DefaultSqlSession(configuration);

IUserDao userDao = sqlSession.getMapper(IUserDao.class);

List<User> users = userDao.findAll();

DataSource

数据源

mappedStatementMap

key：statementid，value：封装好的MappedStatement对象

MappedStatement

id

resultType

parameterType

sql