Digression
I believe we are coming from SSM era, a lot of time to see the profile of mind will collapse. Sometimes a configuration file in the wrong place, the entire project will probably not run, or simply can not find the error, "Mo angry" has become essential books program ape. . . Later Spring Boot turned appear, and finally do not have to face every day of the configuration file, inexplicably happy! Spring Boot frame is the best in the world! Haha.
Import dependence
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<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>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
Modify the configuration file
application.properties：
spring.profiles.active: dev
application-dev.properties：
server.port = 8080
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.url = jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
mybatis.mapper-locations = classpath:mapping/*Mapper.xml
mybatis.type-aliases-package = edu.szu.test.entity
logging.level.com.example.mapper = debug
Here I use two configuration files, application.properties and application-dev.properties. Why can not we a configuration file written it?
This is because we need to configure multiple sets in a project environment, generally speaking, there are a variety of environmental projects, development environment, test environment, the production environment, and so on. Each parameter used in the environment is different, so we can put the configuration parameters for each environment to the master configuration file, which would like to use this in the environment when used only in the main configuration file configuration file to write on the line.
Note that, in the Spring Boot multi environment configuration file names need to meet application- {profile} .properties format, wherein {profile} identification corresponding to your environment, such as:
- application-dev.properties: Development Environment
- application-test.properties: Test Environment
- application-prod.properties: the production environment
As to which specific configuration file is loaded, it is necessary to set by spring.profiles.active application.properties file attribute, whose value corresponds to the value {profile}.
Create a data table
sql code is as follows:
CREATE TABLE `book` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(10) NOT NULL,
`price` float NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
Data table structure
can see I've inserted two data
Creating pojo
Create an entity package, and then create a package inside the pojo
public class Book {
private Integer id;
private Float price;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Float getPrice() {
return price;
}
public void setPrice(Float price) {
this.price = price;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Book{" +
"id=" + id +
", name='" + name + '\'' +
", price='" + price + '\'' +
'}';
}
}
Create a mapper
Create a mapper package, and then create a mapper in the package inside
public interface BookMapper {
Book selectById(int id);
}
Create a file mapper.xml
In the src / main / resources directory, create a folder mapping, and then create a new file BookMapper.xml.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="edu.szu.test.mapper.BookMapper">
<resultMap id="BaseResultMap" type="edu.szu.test.entity.Book">
<result column="id" jdbcType="INTEGER" property="id" />
<result column="name" jdbcType="VARCHAR" property="name" />
<result column="price" jdbcType="REAL" property="price" />
</resultMap>
<select id="selectById" resultType="edu.szu.test.entity.Book">
select * from book where id = #{id}
</select>
</mapper>
Create a service
Create a service package, and then create a service interface inside the package
public interface BookService {
public Book select(int id);
}
Creating serviceImpl
ServiceImpl create a package, and then create a service implementation class in the package inside
@Service
public class BookServiceImpl implements BookService{
@Autowired
BookMapper bookMapper;
public Book select(int id) {
return bookMapper.selectById(id);
}
}
Creating the Controller
Create a controller package, and then create a controller implementation class in the package inside
@RestController
@RequestMapping("/test")
public class BookController {
@Autowired
private BookService bookService;
@RequestMapping("getBook/{id}")
public String GetUser(@PathVariable int id){
return bookService.select(id).toString();
}
}
Modify the startup class
@SpringBootApplication
@MapperScan("edu.szu.test.mapper")
public class TestApplication {
public static void main(String[] args) {
SpringApplication.run(TestApplication.class, args);
}
}
Add a line comment @MapperScan ( "edu.szu.test.mapper") on the startup class, show mapper file path needs to be scanned.
Finally, we test it!
Enter in the browser http: // localhost: 8080 / test / getBook / 1, the following results
enter the browser to http: // localhost: 8080 / test / getBook / 2, results are
combined with the data table we created earlier
proof Spring Boot and MyBatis has been successfully integrated.
Finally send my frame structure
Reference: SpringBoot integration complete and detailed version Mybatis