CH10-整体流程

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1. 通过 Resource 加载配置

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class MyBatisUtils {
    private static SqlSessionFactory sqlSessionFactory;

    static {
        try {
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static SqlSession getSqlSession() {
        return sqlSessionFactory.openSession();
    }
}

2. 实例化 sqlSessionFactoryBuilder 构造器

sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

3. 通过 build 中 XmlConfigBuilder 类解析文件流以及环境和属性

XMLConfigBuilder parser = new XMLConfigBuilder(inputStream, environment, properties);
var5 = this.build(parser.parse());

4. 将配置信息存放到 Configuration 中

public SqlSessionFactory build(Configuration config) {
    return new DefaultSqlSessionFactory(config);
}

5. 实例化 SqlSessionFactory 实现类 DefaultSqlSessionFactory

6. 由 TransactionFactory 创建一个 Transaction 事务对象

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7. 创建执行器 Excutor，执行 mapper

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8. 创建 SqlSession 接口实现类 DefaultSqlSession

SqlSession sqlSession = MybatisUtils.getSqlSession()
UserMapper mapper = sqlSession.getMapper(UserMapper.class);

9. 执行 CRUD

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10. 判断是否成功，失败则回滚到事务提交器

11. 提交事务

sqlSession.commit();

12. 关闭

sqlSession.close();