MyBatis源码解析之环境搭建

川长思鸟来 2023-01-12 10:22 225阅读 0赞

企业级web开发中，用的比较多的就属于mybatis了。mybatis是一个与数据库交互的持久层框架。我们就简单分析下mybatis的底层原理。

这里环境搭建可以参考mybatis官方文档  
[mybatis官网文档][mybatis]

## 1、创建datasource ##

private static DataSource getDataSource(){ 
            String url = "jdbc:mysql://192.168.175.3:3306/ssm_crud?failOverReadOnly=false&useSSL=false";
            String userName = "root";
            String password = "root";
            String driver = "com.mysql.jdbc.Driver";
            return new PooledDataSource(driver, url, userName, password);
        }

## 2、创建sqlSessionFactory ##

public static SqlSessionFactory getFactory(){ 
            DataSource dataSource = getDataSource();
            TransactionFactory transactionFactory = new JdbcTransactionFactory();
            Environment environment = new Environment("development", transactionFactory, dataSource);
            Configuration configuration = new Configuration(environment);
            configuration.addMapper(Mapper.class);
            return new SqlSessionFactoryBuilder().build(configuration);
        }

## 3、获取sqlSession，拿到结果 ##

public static void main(String[] args) { 
            SqlSessionFactory factory = MyBatisConfig.getFactory();
            SqlSession sqlSession = factory.openSession();
            Mapper myMapper = sqlSession.getMapper(Mapper.class);
            String name = myMapper.select("M");
            System.err.println(name);
        }

毫无疑问，执行结果 也拿到了。  
![在这里插入图片描述][2021012816175885.png]

[mybatis]: https://mybatis.org/mybatis-3/zh/getting-started.html
[2021012816175885.png]: /images/20221119/a53c15b61c454e4fb0c1cafa58729085.png