一篇超详细的Spring Boot整合Mybatis文章

配置文件形式

一篇超详细的Spring Boot整合Mybatis文章_第1张图片

pom.xml



    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.4.4
         
    
    com.keafmd
    spring-boot-09-mybatis
    0.0.1-SNAPSHOT
    spring-boot-09-mybatis
    Demo project for Spring Boot
    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter-jdbc
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.2
        
        
            mysql
            mysql-connector-java
            runtime
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    


配置数据源

在yml文件中配置数据源。

application.yml:

server:
  port: 80

# 配置数据源
spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/ssm-java1?useSSL=false
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: 18044229

# 整合mybatis
mybatis:
  #  typeAliasesPackage: com.neuedu.entity
  mapper-locations: classpath*:com/neuedu/boot/mapper/*.xml

UserMapper.xml

这里注意!!!:一定是和UserMapper相同的目录,是个三级目录,创建时仿照这样创建com/keafm/mapper(正确的) 别这样com.keafam.mapper(错误的),这样错误的创建的话,是个一级目录,不是三级的,后面运行的时候可能会提示找不到Mapper。




    

UserMapper

package com.keafmd.mapper;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
/**
 * Keafmd
 *
 * @ClassName: UserMapper
 * @Description:
 * @author: 牛哄哄的柯南
 * @Date: 2021-04-08 16:09
 * @Blog: https://keafmd.blog.csdn.net/
 */
public interface UserMapper {
    List list();
}

配置springboot整合mybatis

在application.yml中配置:

# 整合mybatis
mybatis:
  #  typeAliasesPackage: com.neuedu.entity
  mapper-locations: classpath*:com/neuedu/boot/mapper/*.xml

在运行类上添加@MapperScan注解

SpringBoot09MybatisApplication:

package com.keafmd;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.keafmd.mapper")
public class SpringBoot09MybatisApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringBoot09MybatisApplication.class, args);
    }
}

测试类

UserMapperTest :

package com.keafmd.mapper;
import com.keafmd.SpringBoot09MybatisApplication;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.List;
import static org.junit.jupiter.api.Assertions.*;
@SpringBootTest(classes = SpringBoot09MybatisApplication.class)
class UserMapperTest {
    @Autowired
    UserMapper userMapper;
    @Test
    void list(){
        List list = userMapper.list();
        for (Object o : list) {
            System.out.println(o);
        }
    }
}

效果

一篇超详细的Spring Boot整合Mybatis文章_第2张图片

总结

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