建立專案

• New Project，選擇Spring Initiallizr，點選Next
• 輸入Group：com.example，輸入Artifact：mybatisdemo，選擇Java Version 8，點選Next
• 選擇Web的Spring Web，SQL的MyBatis Framework和MS Sql Server Driver，點選Next

準備資料

CREATE TABLE Article(
    id          INT IDENTITY PRIMARY KEY,
    title       VARCHAR(100) NOT NULL,
    author      VARCHAR(100) NOT NULL
);
INSERT INTO Article
VALUES ('Working with MyBatis in Spring', 'Baeldung');
INSERT INTO Article
VALUES ('Java程式設計思想', '張三');
 

新增配置

resources下面新增application.yml檔案

spring:
  datasource:
    name: mssqlDB
    url: jdbc:sqlserver://localhost:1433;databaseName=OnLineDB
    username: sa
    password: sa
    driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver
mybatis:
  mapper-locations: classpath:mapper/*.xml

注意：卻下pom.xml的依賴是否包含如下，如果沒有拷貝進去

        <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>2.1.2</version>
        </dependency>

        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>mssql-jdbc</artifactId>
            <scope>runtime</scope>
        </dependency>
 

新增實體層

• 右擊專案com.example.mybatisdemo，新增Java Class
• 輸入entity.Article

public class Article {
    private Integer id;

    private String title;

    private String author;

    private static final long serialVersionUID = 1L;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }
}

新增DAO層

• com.example.mybatisdemo新增Package：dao
• dao下面新增介面ArticleDao

@Mapper
public interface ArticleDao {
    Article getArticleById(int id);
}

• resources下面新增mapper資料夾
• mapper新增檔案ArticleMapper.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="com.example.mybatisdemo.dao.ArticleDao">
    <select id="getArticleById" resultType="com.example.mybatisdemo.entity.Article">
        select * from Article where id = #{id}
    </select>
</mapper>

新增服務層

• 新增Package：service
• 裡面新增介面：ArticleService

public interface ArticleService {
    Article getArticleById(int id);
}

新增服務層

• 新增實現：service下面新增Package：impl
• 新增類：ArticleServiceImpl

@Service
public class ArticleServiceImpl implements ArticleService {
    @Autowired
    private ArticleDao articleDao;

    @Override
    public Article getArticleById(int id) {
        return articleDao.getArticleById(id);
    }
}

新增控制器

• com.example.mybatisdemo新增Package：controller
• 新增控制器：ArticleController

@RestController
@RequestMapping("/article")
public class ArticleController {
    @Autowired
    private ArticleService articleService;

    @GetMapping("/getHello")
    @ResponseBody
    public String getHello() {
        return "Hello";
    }

    @GetMapping("/getArticleById/{id}")
    @ResponseBody
    public Article getArticleById(@PathVariable int id) {
        return this.articleService.getArticleById(id);
    }
}

執行專案

訪問：http://localhost:8080/article/getArticleById/2