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);

}

}

}