四、jdbctemplate使用

这里使用mysql数据库，省略数据库创建过程

1、添加依赖

        <!--jdbc-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.6</version>
        </dependency>    

2、添加数据库配置

#数据库
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3、编写代码

@Repository
public class UserDao {

    @Autowired
    private JdbcTemplate jt;

    public List<Map<String, Object>> listUser(){
        StringBuilder sql = new StringBuilder();
        sql.append("SELECT * FROM t_sp_user");
        return jt.queryForList(sql.toString());
    }
}

@Service
public class UserService {

    @Autowired
    private UserDao userDao;

    public List<Map<String, Object>> listUser(){
        return userDao.listUser();
    }
}

@RestController
@RequestMapping(value = "user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping(value = "list")
    public List<Map<String, Object>> listUser(){
        return userService.listUser();
    }
}