SpringBoot持久层技术

一、Springboot整合mybatis

maven中添加对数据库与mybatis的依赖

 <dependencies>
     <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
     </dependency>
     <dependency>
         <groupId>org.mybatis.spring.boot</groupId>
         <artifactId>mybatis-spring-boot-starter</artifactId>
     </dependency>
     <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
     </dependency>
     <dependency>
         <groupId>com.alibaba</groupId>
         <artifactId>druid</artifactId>
     </dependency>
 </dependencies>

添加application.properties关于mybatis的配置

 spring.datasource.driverClassName=com.mysql.jdbc.Driver
 spring.datasource.url=jdbc:mysql://127.0.0.1:3306/dbName
 spring.datasource.username=root
 spring.datasource.password=root
 spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
 mybatis.type-aliases-package=io.guangsoft.pojo

mapper的xml文件所在目录需要在springboot启动类中配置扫描

1 @SpringBootApplication
2 @MapperScan("io.guangsoft.mapper")

数据库表设计

 create table users(
     id int(11) not null auto_increment,
     name varchar(25) default null,
     age int default null,
     primary key (id)
 )engine=InnoDB default charset=utf8;

pojo

 public class User {
     private Integer id;
     private String name;
     private Integer age;
     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public Integer getAge() {
         return age;
     }
     public void setAge(Integer age) {
         this.age = age;
     }
 }

mapper

 public interface UserMapper {
     void insertUser(User user);
     List<User> selectUserAll();
 }

 <mapper namespace="io.guangsoft.mapper.UserMapper">
     <insert id="insertUser" parameterType="user">
         insert into user(name, age) values (#{name}, #{age})
     </insert>
     <select id="selectUserAll" resultType="user">
         select id, name, age from user
     </select>
 </mapper>

service

 @Service
 @Transactional
 public class UserServiceImpl implements UserService {
     @Autowired
     private UserMapper userMapper;
     @Override
     public void addUser(User user) {
         this.userMapper.insertUser(user);
     }
 }

controller

 @Controller
 @RequestMapping("/user")
 public class UserController {
     @Autowired
     private UserService userService;
     @RequestMapping("/{page}")
     public String showPage(String page) {
         return page;
     }
     @RequestMapping("/addUser")
     public String addUser(User user) {
         this.userService.addUser(user);
         return "ok";
     }
 }