SpringBoot 整合MyBatis

MyBatis支持定制化SQL、存储过程以及高级映射。MyBatis几乎避免了所有的JDBC代码手动设置参数以及获取结果集。在传统的SSM框架整合中，使用MyBatis需要大量的XML配置，而在Spring Boot中，MyBatis官方提供了一套自动化配置方案，可以做到MyBatis开箱即用。

添加MyBatis依赖、数据库驱动依赖以及数据库连接池依赖:

        <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>

application.yml配置:

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://localhost:3306/boot?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
    username: root
    password: 123456

mybatis:
  mapper-locations:
    - classpath:mapper/*.xml

创建数据库访问层:

@Mapper
public interface BookMapper {

    int addBook(Book book);

    int deleteBookById(Integer id);

    int updateBookById(Book book);

    Book getBookById(Integer id);

    List<Book> getAllBooks();
}

有两种方式指明该类是一个Mapper：

第一种如前面的代码所示，在BookMapper上添加@Mapper注解，表明该接口是一个MyBatis中的Mapper，这种方式需要在每一个Mapper上都添加注解；

还有一种简单的方式是在配置类上添加@MapperScan("org.sang.mapper")注解，表示扫描org.sang.mapper包下的所有接口作为Mapper，这样就不需要在每个接口上配置@Mapper注解了。

创建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="com.xc.xcspringboot.mapper.BookMapper">
    <insert id="addBook" parameterType="com.xc.xcspringboot.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="com.xc.xcspringboot.model.Book">
        UPDATE book
        set name=#{name},
            author=#{author}
        WHERE id = #{id}
    </update>
    <select id="getBookById" parameterType="int" resultType="com.xc.xcspringboot.model.Book">
        SELECT *
        FROM book
        WHERE id = #{id}
    </select>
    <select id="getAllBooks" resultType="com.xc.xcspringboot.model.Book">
        SELECT *
        FROM book
    </select>
</mapper>

ookService与BookController，代码如下：

@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();
    }
}

　　

@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);
    }

}

　　

参考来源:Spring Boot+Vue全栈开发实战 5.2 整合MyBatis