MyBatis 5.Java API

SqlSession

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

URL getResourceURL(String resource)URL getResourceURL(ClassLoader loader, String resource)InputStream getResourceAsStream(String resource)InputStream getResourceAsStream(ClassLoader loader, String resource)Properties getResourceAsProperties(String resource)Properties getResourceAsProperties(ClassLoader loader, String resource)Reader getResourceAsReader(String resource)Reader getResourceAsReader(ClassLoader loader, String resource)File getResourceAsFile(String resource)File getResourceAsFile(ClassLoader loader, String resource)InputStream getUrlAsStream(String urlString)Reader getUrlAsReader(String urlString)Properties getUrlAsProperties(String urlString)Class classForName(String className)

手动创建过程

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);

SqlSessionFactory

SqlSessionFactory 有六个方法可以用来创建 SqlSession 实例。通常来说,如何决定是你 选择下面这些方法时:

• Transaction (事务): 你想为 session 使用事务或者使用自动提交(通常意味着很多 数据库和/或 JDBC 驱动没有事务)?
• Connection (连接): 你想 MyBatis 获得来自配置的数据源的连接还是提供你自己
• Execution (执行): 你想 MyBatis 复用预处理语句和/或批量更新语句(包括插入和 删除)?

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();

SqlSession

语句执行方法

<T> T selectOne(String statement, Object parameter)<E> List<E> selectList(String statement, Object parameter)<K,V> Map<K,V> selectMap(String statement, Object parameter, String mapKey)int insert(String statement, Object parameter)int update(String statement, Object parameter)int delete(String statement, Object parameter)

他们分别有不要参数对象的重载

<T> T selectOne(String statement)<E> List<E> selectList(String statement)<K,V> Map<K,V> selectMap(String statement, String mapKey)int insert(String statement)int update(String statement)int delete(String statement)

查询分页的高级方法

<E> List<E> selectList (String statement, Object parameter, RowBounds rowBounds)<K,V> Map<K,V> selectMap(String statement, Object parameter, String mapKey, RowBounds rowbounds)void select (String statement, Object parameter, ResultHandler<T> handler)void select (String statement, Object parameter, RowBounds rowBounds, ResultHandler<T> handler)

int offset = 100;int limit = 25;RowBounds rowBounds = new RowBounds(offset, limit);