SpringBoot-整合Mybatis-11

整合Mybatis

1. 在pom.xml中引入依赖

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.0</version>
        </dependency>

2. 在application.yaml中配置如下的配置

spring:
  datasource:
    username: root
    password: ?
    url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.jdbc.Driver
mybatis:
  type-aliases-package: com.sli.pojo
  mapper-locations: classpath:mybatis/mapper/*.xml

3. 新建一个实体类的属性对应数据库中的列的内容

  private int id;
    private String name;
    private  String pwd;
	//有参无参构造器,getset方法以及tostring

4. 建立对应的mapper接口包含了CRUD方法

@Mapper//这个注解表示了这个是一个mybatis的类  相当于扫描包
@Repository
public interface UserMapper {

    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);
}

5. 新建对应mapper接口的xml文件

<?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.sli.mapper.UserMapper">

    <select id="queryUserList" resultType="User">
        select * from user
    </select>

    <select id="queryUserById" resultType="User">
        select * from user where id = #{id}
    </select>

    <insert id="addUser" parameterType="User">
        insert into user (id,name,pwd) value (#{id},#{name},#{pwd})
    </insert>

    <update id="updateUser" parameterType="User">
        update user set name = #{name},pwd = #{pwd} where id = #{id}
    </update>

    <delete id="deleteUser" parameterType="int">
        delete from user where id = #{id}
    </delete>
</mapper>

6. 创建controller测试

@RestController
public class UserController {

    @Autowired
    private UserMapper userMapper;

    @GetMapping("/queryUserList")
    public List<User> queryUserList(){
        List<User> userList = userMapper.queryUserList();
        for (User user : userList) {
            System.out.println(user);
        }
        return userList;
    }
}