Spring整合Mybatis(注解方式)
环境准备
jar包：
Spring所需依赖：spring-context、spring-aspects、aspectjrt、aspectjweaver、spring-tx、spring-jdbc
mybatis所需要：mybatis、mybatis-spring、mysql-connector-java、(druid、c3p0、HikariCP)
辅助性依赖：logback-classic、lombok、spring-test、junit、mapper(可选)、pagehelper(可选)
数据库：mysql
服务层代码
@Service
@Data
public class UserService implements IUserService {
private SqlSessionTemplate sqlSession;
private UserMapper mapper;
public UserService(SqlSessionTemplate sqlSession){
this.sqlSession=sqlSession;
mapper=sqlSession.getMapper(UserMapper.class);
}
@Override
public List getAll() {
return mapper.getAll();
}
}
mapper.xml
/p>
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
select * from user
纯注解方式
纯注解方式需要一个配置类来代替xml配置文件的作用，需在配置文件上注
//注解扫描
@ComponentScan(basePackages = "com.hello")
//声明当前类为配置类
@Configuration
配置类中@Bean相当于xml的标签
通过@Bean将类放入spring容器，也可以通过注解扫描
配置类具体内容
@ComponentScan(basePackages = "com.hello")
@Configuration
public class Config {
//配置数据库连接池
@Bean
public DataSource dataSource(){
//使用HikariCP连接池
HikariDataSource hikariDataSource = new HikariDataSource();
//配置连接池的jdbcUrl属性
hikariDataSource.setJdbcUrl("jdbc:mysql://localhost:3306/ssm?servexrTimezone=GMT%2B8");
//账号
hikariDataSource.setUsername("root");
//密码
hikariDataSource.setPassword("root");
//驱动Driver
hikariDataSource.setDriverClassName("com.mysql.jdbc.Driver");
return hikariDataSource;
}
//配置sqlSessionFactory
@Bean
public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
//在spring和Mybatis整合中采用mybatis提供的SQLSessionFactoryBean对象
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
//为sqlSessionFatoryBean设置连接池属性
sqlSessionFactoryBean.setDataSource(dataSource());
//获取PathMatchingResourcePatternResolver对象为扫描mapper文件做准备
PathMatchingResourcePatternResolver path = new PathMatchingResourcePatternResolver();
//设置mapper文件位置
sqlSessionFactoryBean.setMapperLocations(path.getResources("classpath*:com/hello/mapper/**/*.xml"));
//为javaBean对象设置别名
sqlSessionFactoryBean.setTypeAliasesPackage("com.hello.bean");
//返回SqlSessionFactory对象
return sqlSessionFactoryBean.getObject();
}
//配置sqlSession
@Bean
public SqlSessionTemplate sqlSessionTemplate() throws Exception {
//将SqlSessionFactory作为参数传入构造方法
SqlSessionTemplate sqlSessionTemplate = new SqlSessionTemplate(sqlSessionFactoryBean());
return sqlSessionTemplate;
}
@Bean
public UserService userService() throws Exception {
UserService userService = new UserService(sqlSessionTemplate());
return userService;
}
}
测试类具体内容
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {Config.class})
public class AppTest
{
@Autowired
public UserService userService;
@Test
public void getALL(){
List users = userService.getAll();
for (User user:users) {
System.out.println(user);
}
}
}
)
