SpringBoot整合Mybatis案例

SpringBoot整合Mybatis案例

1. 导入MyBatis所需要的依赖

<dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
</dependency>

2. 配置数据库连接

spring.datasource.username=root
spring.datasource.password=970814
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

3. 创建实体类

user.java

package com.barry.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {

    private int id;
    private String name;
    private String pwd;
}

4. 创建UserMapper接口

package com.barry.mapper;

import com.barry.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper //表示MyBatis的Mapper
@Repository
public interface UserMapper {

    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);
}

5. 对应的Mapper映射文件

<?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.barry.mapper.UserMapper">
    <select id="queryUserList" resultType="User">
        select * from mybatis.user
    </select>

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

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

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

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

</mapper>

6. SpringBoot配置中配置MyBatis，Mapper文件位置，别名等

# 整合mybatis
mybatis.type-aliases-package=com.barry.pojo
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

7. 编写Controller进行测试

@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;
    }
}

访问localhost:8080/queryUserList测试，finish！！！