mybatis 基础理解

1、主要的类

1.1 SqlSessionFactoryBuilder

用于创建SqlSessionFactory，要通过配置文件也可以是代码。

主要的方法

SqlSessionFactory build(InputStream inputStream)SqlSessionFactory build(InputStream inputStream, String environment)SqlSessionFactory build(InputStream inputStream, Properties properties)SqlSessionFactory build(InputStream inputStream, String env, Properties props)SqlSessionFactory build(Configuration config)

创建的示例

String resource = "org/mybatis/builder/mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();SqlSessionFactory factory = builder.build(inputStream);

DataSource dataSource = BaseDataTest.createBlogDataSource();TransactionFactory transactionFactory = new JdbcTransactionFactory();Environment environment = new Environment("development", transactionFactory, dataSource);Configuration configuration = new Configuration(environment);configuration.setLazyLoadingEnabled(true);configuration.setEnhancementEnabled(true);configuration.getTypeAliasRegistry().registerAlias(Blog.class);configuration.getTypeAliasRegistry().registerAlias(Post.class);configuration.getTypeAliasRegistry().registerAlias(Author.class);configuration.addMapper(BoundBlogMapper.class);configuration.addMapper(BoundAuthorMapper.class);SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();SqlSessionFactory factory = builder.build(configuration);

1.2 SqlSessionFactory

用于创建SqlSession

主要方法

SqlSession openSession()SqlSession openSession(boolean autoCommit)SqlSession openSession(Connection connection)SqlSession openSession(TransactionIsolationLevel level)SqlSession openSession(ExecutorType execType,TransactionIsolationLevel level)SqlSession openSession(ExecutorType execType)SqlSession openSession(ExecutorType execType, boolean autoCommit)SqlSession openSession(ExecutorType execType, Connection connection)Configuration getConfiguration();

1.3 SqlSession

持久层操作会话

常用方法

 T selectOne(String statement) List selectList(String statement) Map selectMap(String statement, String mapKey)int insert(String statement)int update(String statement)int delete(String statement)

事务操作方法

void commit()void commit(boolean force)void rollback()void rollback(boolean force)

2、配置文件

注：

配置文件元素与JAVA操作方法是可以相互对应的； 配置文件中元素是可以独立，如属性文件和注解。

详细参考官网地址：http://www.mybatis.org/mybatis-3/zh/configuration.html#environments