SpringBoot持久层技术

一、Springboot整合mybatis

maven中添加对数据库与mybatis的依赖

 1 <dependencies>
 2     <dependency>
 3         <groupId>org.springframework.boot</groupId>
 4         <artifactId>spring-boot-starter-web</artifactId>
 5     </dependency>
 6     <dependency>
 7         <groupId>org.mybatis.spring.boot</groupId>
 8         <artifactId>mybatis-spring-boot-starter</artifactId>
 9     </dependency>
10     <dependency>
11         <groupId>mysql</groupId>
12         <artifactId>mysql-connector-java</artifactId>
13     </dependency>
14     <dependency>
15         <groupId>com.alibaba</groupId>
16         <artifactId>druid</artifactId>
17     </dependency>
18 </dependencies>

添加application.properties关于mybatis的配置

1 spring.datasource.driverClassName=com.mysql.jdbc.Driver
2 spring.datasource.url=jdbc:mysql://127.0.0.1:3306/dbName
3 spring.datasource.username=root
4 spring.datasource.password=root
5 spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
6 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

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

pojo

 1 public class User {
 2     private Integer id;
 3     private String name;
 4     private Integer age;
 5     public Integer getId() {
 6         return id;
 7     }
 8     public void setId(Integer id) {
 9         this.id = id;
10     }
11     public String getName() {
12         return name;
13     }
14     public void setName(String name) {
15         this.name = name;
16     }
17     public Integer getAge() {
18         return age;
19     }
20     public void setAge(Integer age) {
21         this.age = age;
22     }
23 }

mapper

1 public interface UserMapper {
2     void insertUser(User user);
3     List<User> selectUserAll();
4 }

1 <mapper namespace="io.guangsoft.mapper.UserMapper">
2     <insert id="insertUser" parameterType="user">
3         insert into user(name, age) values (#{name}, #{age})
4     </insert>
5     <select id="selectUserAll" resultType="user">
6         select id, name, age from user
7     </select>
8 </mapper>

service

 1 @Service
 2 @Transactional
 3 public class UserServiceImpl implements UserService {
 4     @Autowired
 5     private UserMapper userMapper;
 6     @Override
 7     public void addUser(User user) {
 8         this.userMapper.insertUser(user);
 9     }
10 }

controller

 1 @Controller
 2 @RequestMapping("/user")
 3 public class UserController {
 4     @Autowired
 5     private UserService userService;
 6     @RequestMapping("/{page}")
 7     public String showPage(String page) {
 8         return page;
 9     }
10     @RequestMapping("/addUser")
11     public String addUser(User user) {
12         this.userService.addUser(user);
13         return "ok";
14     }
15 }