SpringBoot整合持久层技术--（二）MyBatis

简介：

　　原名iBatis,SpringBoot中使用MyBatis：

pom.xml

　　　　<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>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.9</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>

2.数据库表，实体类以及配置文件与上一章JdbcTemplate那没有区别，

3.从下往上写，dao层：还是一样的，增删改查查询所有方法

@Mapper
public interface BookMapper {
    int addBook(Book book);
    int deleteBookById(Integer id);
    int updateBookById(Book book);
    Book getBookById(Integer id);
    List<Book> getAllBooks();
}

<?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="org.sang.mapper.BookMapper">

    <insert id="addBook" parameterType="org.sang.model.Book">
    INSERT INTO book(name,author) VALUES (#{name},#{author})
    </insert>

    <delete id="deleteBookById" parameterType="int">
        DELETE FROM book WHERE id=#{id}
    </delete>

    <update id="updateBookById" parameterType="org.sang.model.Book">
        UPDATE book set name=#{name},author=#{author} WHERE id=#{id}
    </update>

    <select id="getBookById" parameterType="int" resultType="org.sang.model.Book">
        SELECT * FROM book WHERE id=#{id}
    </select>

    <select id="getAllBooks" resultType="org.sang.model.Book">
        SELECT * FROM book
    </select>
</mapper>

4.service：

@Service
public class BookService {
    @Autowired
    BookMapper bookMapper;
    public int addBook(Book book) {
        return bookMapper.addBook(book);
    }
    public int updateBook(Book book) {
        return bookMapper.updateBookById(book);
    }
    public int deleteBookById(Integer id) {
        return bookMapper.deleteBookById(id);
    }
    public Book getBookById(Integer id) {
        return bookMapper.getBookById(id);
    }
    public List<Book> getAllBooks() {
        return bookMapper.getAllBooks();
    }
}

5.controller:

@RestController
public class BookController {
    
    @Autowired
    BookService bookService;
  
   @GetMapping("/bookOps")
    public void bookOps() {
        Book b1 = new Book();
        b1.setName("西厢记");
        b1.setAuthor("王实甫");
        int i = bookService.addBook(b1);
        System.out.println("addBook>>>" + i);

        Book b2 = new Book();
        b2.setId(1);
        b2.setName("朝花夕拾");
        b2.setAuthor("鲁迅");
        int updateBook = bookService.updateBook(b2);
        System.out.println("updateBook>>>"+updateBook);

        Book b3 = bookService.getBookById(1);
        System.out.println("getBookById>>>"+b3);

        int delete = bookService.deleteBookById(2);
        System.out.println("deleteBookById>>>"+delete);

        List<Book> allBooks = bookService.getAllBooks();
        System.out.println("getAllBooks>>>"+allBooks);
    }
}

http://localhost:8080/bookOps