目录
- Spring 整合 MyBatis
- Spring 整合 Junit
Spring 整合 MyBatis
- MyBatis 程序核心对象分析
// 初始化 SqlSessionFactory
// 1. 创建SqlSessionFactoryBuilder对象
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
// 2. 加载SqlMapConfig.xml配置文件
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
// 3. 创建SqlSessionFactory对象
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);// 获取连接，获取实现
// 4. 获取SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
// 5. 执行SqlSession对象执行查询，获取结果User
AccountDao accountDao = sqlSession.getMapper(AccountDao.class);// 获取数据层接口
Account ac = accountDao.findById(2);
System.out.println(ac);// 关闭连接
// 6. 释放资源
sqlSession.close();
三个对象：SqlSessionFactory、SqlSession、accountDao
但最核心的对象是 SqlSessionFactory
这个对象由配置得来的：
<!--初始化属性数据-->
<configuration><properties resource="jdbc.properties"></properties><!--初始化类型别名--><typeAliases><package name="com.itheima.domain"/></typeAliases><!--初始化 dataSource--><environments default="mysql"><environment id="mysql"><transactionManager type="JDBC"></transactionManager><dataSource type="POOLED"><property name="driver" value="${jdbc.driver}"></property><property name="url" value="${jdbc.url}"></property><property name="username" value="${jdbc.username}"></property><property name="password" value="${jdbc.password}"></property></dataSource></environment></environments><!--初始化映射配置--><mappers><package name="com.itheima.dao"></package></mappers>
</configuration>
- Spring 整合 MyBatis
-
- 导坐标：
<dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.10.RELEASE</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.3.0</version></dependency>
-
- 将配置文件转换为类：
//定义bean，SqlSessionFactoryBean，用于产生SqlSessionFactory对象@Beanpublic SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();ssfb.setTypeAliasesPackage("com.itheima.domain");ssfb.setDataSource(dataSource);return ssfb;}//定义bean，返回MapperScannerConfigurer对象@Beanpublic MapperScannerConfigurer mapperScannerConfigurer(){MapperScannerConfigurer msc = new MapperScannerConfigurer();msc.setBasePackage("com.itheima.dao");return msc;}
Spring 整合 Junit
- 导坐标
<dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.2.10.RELEASE</version></dependency>
- Spring 整合 Junit 专用的类加载器
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
//设置类运行器
@RunWith(SpringJUnit4ClassRunner.class)
//设置Spring环境对应的配置类
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTest {//支持自动装配注入bean@Autowiredprivate AccountService accountService;@Testpublic void testFindById(){System.out.println(accountService.findById(1));}@Testpublic void testFindAll(){System.out.println(accountService.findAll());}
}
)
